2025-hvac specification-10-19-11Proj. No. 10105 Residence Conversions October 7, 2011
58 Kensington, 57 Dryads Green, 72 Dryads Green
Smith College, Northampton, MA
HVAC Page 1 of 48 233000
SECTION 233000
HVAC
INDEX
PART 1 –GENERAL PART 3 –INSTALLATION
1. 1
1.2
1. 3
1..4
1. 5
1. 6
1. 7
1. 8
1. 9
1.10
1.11
1.12
1.13
1.14
1.15
1.16
1.17
1.18
1.19
1.20
1.21
RELATED DOCUMENTS
SCOPE OF WORK
CODES, ORDINANCES AND INSPECTIONS
INSTALLATION REQUIREMENTS
QUALITY ASSURANCE
PRODUCTS
SUBMITTALS
PERMITS, FEES AND INSPECTIONS
TEMPORARY HOOK-UPS
PLANS AND SPECIFICATIONS
PRODUCT HANDLING
ENVIRONMENTAL CONDITIONS
WORK CONCEALED
OPERATING INSTRUCTIONS
GUARANTEE
RECORD DRAWINGS
OPERATION AND MAINTENANCE
PROTECTION
CLEANING
MISCELLANEOUS STEEL SUPPORTS
ALTERNATE
3. 1
3..2
3. 3
3. 4
3. 5
3. 6
3. 7
3. 8
3. 9
3.10
3.11
3.12
3.13
3.14
3.15
CLEANING AIR SYSTEM
CUTTING, PATCHING AND DRILLING
PIPE INSTALLATION
PIPING SYSTEM TESTS
INSTALLATION OF PUMPS
INSTALLATION OF HYDRONIC SPECIALTIES
DAMPERS
FLEXIBLE CONNECTIONS
HANGERS AND SUPPORTS
WATER AND AIR FLOW BALANCE AND
TESTS
INSULATION
EQUIPMENT INSTALLATION
CLEANING AND FLUSHING
SYSTEM TESTS AND CLEAN-UP
FIRE SAFING
PART 2 –MATERIALS
2. 1
2. 2
2. 3
2. 4
2. 5
2. 6
2. 7
2. 8
2.9
2.10
2.11
2.12
2.13
2.14
2.15
2.16
2.17
2.18
2.19
2.20
2.21
SHEET METAL WORK
DUCTWORK SHOP DRAWINGS
REGISTERS AND DIFFUSSERS
EXTRUDED ALUMINUM LOUVERS
COMBUSTION AIR & VENT PIPE
(CONDENSING GAS BOILERS)
FINNED TUBE RADIATION (ALTERNATE BID
NO.2)
PANEL RADIATORS
HYDRONIC BOILERS
PIPE SLEEVES
HANGERS
VALVES
THERMOMETERS
PRESSURE GAUGES
UNIONS
HOT WATER SPECIALTIES AND VALVES
IN-LINE CENTRIFUGAL PUMPS
PIPE & FITTINGS
STRAINERS
ACCESS PANELS
INSULATION
AUTOMATIC TEMPERTURE CONTROL
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Smith College, Northampton, MA
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SECTION 230000 -HEATING, VENTILATING, AIR CONDITIONING
PART 1 –GENERAL
1.1 RELATED DOCUMENTS
A.Include General Conditions, Supplementary General Conditions, and
applicable parts of Division 1, as part of this Section.
B.Examine all other Sections of the Specifications for requirements, which
affect work under this Section whether or not, such work is specifically
mentioned in this Section.
C.Coordinate work with that of all other trades affecting, or affected by the
work of this section. Co-operate with such trades to assure steady progress
of all work under the Contract.
1.2 SCOPE OF WORK
A.Furnish all labor, materials, plant, equipment and services necessary for and
reasonably incidental to the complete installation of all HVAC work specified
herein and/or indicated on the Drawings, including, but not limited to, the
following:
1.The disconnecting removal and proper disposal of all existing
HVAC systems, ducts, piping and equipment interfering with, or
made obsolete by, new construction. All piping ducts and
equipment to be removed is the property of the Owner and shall
be delivered to such places designated by the Owner. Removal
from the site of all obsolete material after the Owner’s review shall
be by this Contractor
2.Gas-fired boiler-burner units.
3.Indirect water heater
4.Boiler breeching and condensing furnace flue/air intake piping..
5.Piping systems for heating hot water, make-up water and
refrigerant,including all associated pumps and hydronic
specialties.
6.Duct systems for supply, return, outdoor air and exhaust, including
fire dampers, registers, diffusers, and louvers.
7.Toe Space heaters
.8.Cabinet and Unit heaters
9.Exhaust and ventilation fans.
10.Insulation for piping, ductwork and equipment.
11.Finned tube radiation.
12.Electric heating units (cabinet unit heaters and wall heaters).
13.Automatic temperature controls.
14.Air and water balancing.
15.Guarantee.
16.Instructions.
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17.Record Drawings.
1.3 CODES, ORDINANCES AND INSPECTIONS
A.All materials and the installation thereof shall conform to the
requirements of the Massachusetts State Building Code, Electrical Code,
Fuel Gas and Plumbing Code and local laws, rules, regulations, and codes
pertaining thereto. Where provisions of the Contract Documents conflict
with any codes, rules, or regulations, the latter shall govern. Where the
Contract requirements are in excess of applicable codes, rules, or
regulations, the Contract provisions shall govern unless the Architect
rules otherwise.
B.The HVAC Subcontractor shall comply with the Local Code Enforcement
Officials' instructions at no additional cost to the Owner.
1.4 INSTALLATION REQUIREMENTS
A.The HVAC Subcontractor shall employ only competent and experienced
workmen at a regular schedule in harmony with the other tradesmen on
the job. He shall also exercise care and supervision of his employees in
regard to proper and expeditious laying out of his work.
B.The HVAC Subcontractor shall have a Foreman or Superintendent
assigned to the Project who shall be authorized to make decisions and
receive instructions exactly as if the Subcontractor himself were present.
The Foreman or Superintendent shall not be removed or replaced
without the express approval of the Architect after construction work
begins.
C.The HVAC Subcontractor shall be held responsible for any injuries or
damage done to the building premises or adjoining property or to other
Contractors' work resulting from the execution of his part of the work in
any manner whatsoever; and in case of dispute arising as to the extent
or share of responsibility incurred by the HVAC Subcontractor, it is
agreed between the Owner and the HVAC Subcontractor that such
liability and extent of damage shall be finally determined by the Architect
whose decision shall be final and binding on both parties to the Contract
for the work in question.
D.The HVAC Subcontractor shall co-operate to the fullest extent with all
other trades in order to expedite the progress of the work. He shall
furnish all information pertaining to his materials as to sizes, locations,
and means of support, to all other trades requiring such information.
The HVAC Subcontractor shall also furnish all sleeves, frames, beams,
supports, inserts, etc., hereinafter specified so that the General
Contractor may build them in place. In case of failure on the part of the
HVAC Subcontractor to give proper information as above, he will be
required to bear the extra expense involved due to such failure.
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E.The arrangement of all piping, ductwork, conduit, wire and cable
indicated on the Drawings is diagrammatic only, and indicates the
minimum requirements of this work. Conditions at the building shall
determine the actual arrangement of runs, bends, offsets, etc. The
HVAC Subcontractor shall lay out all his work at the site and be
responsible for the accuracy thereof. Conditions at the building shall be
the determining factor for all measurements.
F.All work shall be laid out and installed so as to require the least amount
of cutting and patching. Drilling of all holes required for the installation
of pipes, conduit, and cable runs shall be performed by the Subcon-
tractor installing such items.
G.The HVAC Subcontractor shall be responsible for the proper protection
of his work and materials from injury or loss at the hands of others and
shall make good such loss or injury at his own expense. All pipes left
open during the progress of the work shall be capped or plugged at all
times. All instruments and operating apparatus shall be protected by
suitable means.
H.The HVAC Subcontractor shall be responsible for all equipment and
materials installed under this Section until the final acceptance of the
project by the Owner.
I.The HVAC Subcontractor shall check the Architectural Plans and
Specifications before ordering any materials and the installation of work.
Any discrepancies shall be called to the attention of the Architect before
proceeding with the work.
J.Before submitting his bid, the HVAC Subcontractor shall visit the site
with the Drawings and Specifications and shall become thoroughly
familiar with all conditions affecting his work since the HVAC
Subcontractor will be held responsible for any assumption he may make
in regard thereto.
1.5 QUALITY ASSURANCE
A.Equality of materials or articles other than those named or described in
this Section will be determined in accordance with the provisions of the
General Requirements.
B.The HVAC Subcontractor shall agree to accept as final the results of tests
secured by a qualified testing laboratory engaged by the Owner. Tests
will be conducted in accordance with the General Requirements.
1.6 PRODUCTS
A.With the exception of items specifically noted otherwise, all materials
shall be U.S. made, new, full weight, and first class in every respect,
without defects, and designed to function properly in that portion of the
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work for which they are intended, and with the same brand of
manufacturer for each class or category of material or equipment (i.e.,
air handling units and condensing units). Electrical materials and
equipment of types for which there are Underwriters Laboratories
standard requirements, listings, or labels shall conform to their require-
ments and be so labeled.
1.7 SUBMITTALS
A.Before ordering materials shipped to the job, the HVAC Subcontractor
shall submit to the Architect eight (8) sets of catalogue cuts,
manufacturers' data sheets, or Shop Drawings, giving all details,
dimensions, capacities, etc. of all materials to be furnished on the
project.
B.The HVAC Subcontractor shall check the Shop Drawings thoroughly for
compliance with the Plans and Specifications before submitting them to
the Architect for review, making any and all changes, which may be
required.
C.The review of Shop Drawings by the Architect shall not relieve the
Contractor from any obligation to perform the work strictly in accordance
with the Contract Drawings and Specifications. The responsibility for
errors in Shop Drawings shall remain with the HVAC Subcontractor.
D.In the event that materials are being delivered to or installed on the job
for which Shop Drawings or samples have not been approved and/or
which are not in accordance with the Specifications, the Subcontractor
will be required to remove such materials and substitute approved
materials at his own expense and as directed by the Architect
E.Substitution of equipment by this contractor which is to be wired, piped,
or welded shall detail and include any additional changes involved for
work or wiring over and above that required for the equipment specified.
The approval of substitution of equipment does not relieve this
Contractor from the responsibility for any charges for additional work,
which may have to be performed by other trades as a result of any
substitution.
1. 8 PERMITS, FEES AND INSPECTIONS
A.The HVAC Subcontractor shall secure all permits and pay all fees
required for his work. He shall be required to secure all other permits
and pay all other fees and charges incidental to the proper carrying out
of the Contract. He is to assume all responsibility regarding the
observance of the rules and regulations so far as they relate to his part
of the work
B.The HVAC Subcontractor shall arrange and pay for all required
inspections of his work.
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1. 9 TEMPORARY HOOK-UPS
A.The General Contractor will provide any temporary hook-ups required
for the use of water or sanitary for construction purposes and testing out
apparatus as specified in Division 1.
1.10 PLANS AND SPECIFICATIONS
A.The HVAC Subcontractor shall refer to the Architectural Drawings of
interior details, plans, elevations, and structural layout in preparing his
estimate. These documents are intended to supplement the Mechanical
and Electrical Plans and Specifications and any applicable work indicated
or implied thereon is to be considered a part of the Subcontract require-
ments
B.The Plans and Specifications are complementary and anything called for,
or reasonably implied, in the Plans and not in the Specifications, or vice
versa, shall be considered as called for or reasonably implied in both.
C.The HVAC Subcontractor shall assume all responsibility in scaling
measurements from the Drawings.
D.Because of the small scale of the Drawings, it is not possible to indicate
all offsets, fittings and accessories that may be required. The HVAC
Subcontractor shall carefully investigate the structural and finish condi-
tions affecting all his work and shall arrange such work accordingly,
furnishing such fittings, traps, offsets, valves, and accessories as may be
required to meet such conditions, at no additional cost.
1.11 PRODUCT HANDLING
A.The HVAC Subcontractor shall provide for the delivery of all his materials
and fixtures to the building site when required, so as to carry on his
work efficiently and to avoid delaying his work and that of other trades.
1.12 ENVIRONMENTAL CONDITIONS
A.All necessary tools machinery, scaffolding, and transportation for
completion of his Subcontract shall be provided by the HVAC
Subcontractor.
B.The HVAC Subcontractor shall provide his own portable extension lines
and obtain 120 volt, 60 cycle, single phase electric power from the
General Contractor to drive his machines and light his work. He shall
provide his own light bulbs, plugs, sockets, etc
C.All broken or waste material, rags, packing, etc., resulting from his work
shall be removed by the HVAC Subcontractor.
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1.13 WORK CONCEALED
A.All piping and ductwork shall be installed concealed in all areas except
storage rooms, closets, and mechanical or electrical equipment rooms,
unless specifically noted otherwise on the Drawings.
B.Piping containing water shall not be installed concealed in walls having
an exterior exposure above grade.
1.14 OPERATING INSTRUCTIONS
A.Prior to final acceptance, the HVAC Subcontractor shall furnish three (3)
sets of complete instructions for the repair, maintenance, and operation
of all systems installed under his Subcontract. These instructions shall
be typed or printed, and each set bound separately with durable covers.
B.The HVAC Subcontractor shall instruct and fully demonstrate to such
person or persons as the Architect and/or Owner may designate,
regarding the care and use of all systems and all apparatus pertaining
thereto.
1.15 GUARANTEE
A.The HVAC Subcontractor shall guarantee the satisfactory operation of his
work in all parts for a period of one (1) year after date of substantial co-
mpletion, and shall agree to promptly repair or replace any items of his
work which are found to be defective during this period.
B.The HVAC Subcontractor shall pay for repair of damage to the building
caused by defects in his work and for repair to plaster, wood, and other
materials or equipment caused by replacement or repairs to the entire
satisfaction of the Architect.
C.Any part of the work installed under this Contract requiring excessive
maintenance shall be considered as being defective.
1.16 RECORD DRAWINGS
A.Submit Record Drawings as specified in Division 1.
B.Record Drawings shall reflect all changes from the Contract Drawings
whether by change order or by field conditions. Principal dimensions of
concealed work, fire dampers, volume dampers, control dampers and
control valves, and for piping installation, valve numbers shall be added
to these drawings prior to submittal to the Architect. In addition to the
above all revised areas shall be clearly marked with a revision bubble.
1.17 OPERATION AND MAINTENANCE MANUALS
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A.After all final tests and adjustments have been completed, fully instruct
the proper Owner's representative in all details of operation for
equipment installed. Supply qualified personnel to operate equipment
for sufficient length of time to assure that Owner's representative is
properly qualified to take over operation and maintenance procedures.
This Contractor shall video tape the instruction procedures and deliver
three (3) copies of the tape with the Operation and Maintenance
Manuals.
B.Furnish the Architect, for approval, three (3) copies of an Operation and
Maintenance Manual. Inscribe the following identification on the cover:
the words OPERATION AND MAINTENANCE MANUAL, the name and
location of the equipment or the building, the name of the Contractor,
and the Contract number. The manual shall have a table of contents
with tab sheets placed before each section. The instructions shall be
legible and easily read, with large sheets of Drawings folded in. The
manuals shall be bound in hard binders or an approved equivalent
C.The manual shall include the following information:
1.Description of systems.
2.Description of start up, operation, and shutdown procedures for
each item of equipment.
3.Winter/summer changeover procedures.
4.Schedule of adjustment, care, and routine maintenance for each
item of equipment.
5. Lubrication chart.
6.Wiring and control diagrams with data to explain detailed
operation and control of each item of equipment.
7.Valve chart.
8.List of recommended spare parts.
9.Copies of all service contracts.
10.Performance curves for pumps, fans, etc.
11.List of all names, addresses, and phone numbers of all
Subcontractors as well as the local representative for each item of
equipment
D.See the "Automatic Temperature Control" paragraphs of this Section for
additional requirements.
1.18 PROTECTION
A.Work under each Section shall include protecting the work and material
of all other Sections from damage by work or workmen, and shall include
making good all damage thus caused.
B.The Contractor shall be responsible for work and equipment until finally
inspected, tested, and accepted; protect work against theft, injury, or
damage; and carefully store material and equipment received on site
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which is not immediately installed. Close open ends of work with
temporary covers or plugs during construction to prevent entry of
obstructing or foreign material.
C.Work under each Section includes receiving, unloading, uncrating,
storing, protecting, setting in place, and connecting-up completely any
equipment supplied under each Section. Work under each Section shall
also include exercising special care in handling and protecting
equipment and fixtures, and shall include the cost of replacing any of
the equipment and fixtures which are missing or damaged by reason of
mishandling or failure to protect on the part of the HVAC Subcontractor.
D.Equipment and material stored on the job site shall be protected from
the weather, vehicles, dirt, and/or damage by workmen or machinery.
Insure that all-electrical or absorbent equipment or material is protected
from moisture during storage.
1.19 CLEANING
A.The Contractor shall thoroughly clean and flush all piping, ducts, and
equipment of all foreign substances inside and out before being placed
in operation. Thoroughly flush all piping of any oils, burrs, solder, and
flux. Replace strainers and filters at completion of cleaning.
B.If any part of a system should be stopped or damaged by any foreign
matter after being placed in operation, the system shall be disconnected,
cleaned, and reconnected at no additional cost to the Owner.
C.During the course of construction, all ducts, and pipes shall be capped to
insure adequate protection against the entrance of foreign matter.
D.Keep the job site free from the accumulation of waste material and
rubbish. Upon completion of all work under the Contract, the Contractor
shall remove from the premises all rubbish, debris, and excess materials
left over from his work. Any oil or grease stains on floor areas caused by
the Contractor shall be removed and floor areas left clean.
1.20 MISCELLANEOUS STEEL SUPPORTS
A.See drawings and schedules for equipment and materials that need to be
fastened to and/or supported by the structure. This Division shall
furnish and install all necessary anchor bolts, inserts, steel beams, bars,
bearing and leveling plates and incidental items as may be needed to
install the work. Items to be built into masonry and concrete must be
furnished to the respective trade at the proper time to be built-in and
shall include instructions and templates for their installation, unless it is
explicitly shown or specified otherwise.
1.21 ALTERNATES
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A.Alternate No. 2: Change radiators from panel type radiators to Sterling
Kompak-Senior finned tube radiators.
PART 2 -MATERIALS
2.1 SHEET METAL WORK
A.All duct runs shall be checked for clearances before installation of any
ductwork. Above hung ceilings; duct locations and elevations must be
coordinated with work of other trades to avoid conflicts with structure,
piping, conduit and light fixtures.
B.All sheet metal ducts shall be constructed of galvanized steel sheet of
bend forming quality unless noted otherwise.Elevator machine room
ventilation sleeve shall be 16 gauge continuously welded black steel with
3/8” wire mesh screen on each side.
C.Static-Pressure Classes: Unless otherwise indicated, construct ducts to a
pressure class that exceeds the scheduled external pressure rating of the
fan, but no less than the following, whichever is greater according to the
following:
1.Supply Ducts in Constant Volume Systems: 2-inch wg.
2.Return Ducts (Negative Pressure): 2-inch wg.
3.Exhaust Ducts (Negative Pressure): 2-inch wg.
4.Outdoor Air Ducts (Negative Pressure): 2-inch wg.
D.Duct construction shall be in accordance with best practices and latest
ASHRAE or SMACNA requirements for metal gauges, joints, reinforcing
and supports. All exposed ductwork shall be constructed and hung to
provide a neat, smooth, finished appearance. Cadmium plated sheet
metal screws shall be used on all exposed ductwork. Ducts shall be free
from thumping or rattling when fans are turned on or off.
E.Duct sizes shall be strictly followed and no changes in shape or
dimensions shall be made by the HVAC Subcontractor without first
obtaining approval from the Architect, except that duct shall be offset as
required to clear structural members and to co-ordinate with other
trades and any duct changes must meet the latest ASHRAE and SMACNA
standards.
F.The centerline radius of all duct elbows where shown on the Drawings
shall be at least one and one-half times the width of the duct. Where
building conditions do not allow for this radius or where square turns are
shown, manufactured double walled duct turns equal to Aero-Dyne or
Tuttle & Bailey shall be used in the supply or exhaust air ducts and
"Sonotru" acoustical attenuating turns as manufactured by South Control
Products Co. shall be used in any air ducts where acoustical insulation is
included.
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G.Duct sections 1'-6" wide or less shall be butted together and jointed with
flat drive cleats 2-1/8" wide. Top and bottom cleats shall be cut flush
with duct and side cleats bent over to make a tight joint. Standing bar
slips as specified for ducts over 18" may be used at the HVAC
Subcontractor's option.
H.Ducts from 18" to 30" wide shall be jointed with 1/2" standing bar slips
made of metal the same as or heavier than duct sheets. Joints in ducts
with either dimension over 30" shall have 1" standing bar slips on those
sides over 30". Where sides are over 42", the standing bar slips will be
reinforced with 1-1/2" x 1-1/2" x 1/8" angles. Additional angle
stiffeners not over 60" apart shall be provided between joints. Ducts
over 60" in width shall be jointed with 1-1/2" x 1/8" angle irons riveted
to ductwork on all sides with 1/8" rivets at not more than 4-1/2" on
centers, sections bolted with 3/16" stove bolts at not over 6" centers,
sheets turned over angles into joint at least 1/4".
I.Sheet metal screws 3/4" #10 may be used to attach stiffener angles to
ductwork to secure seams, spaced not over 12" on centers and not less
than two per side of 12" or more, except where specified otherwise.
Button punching shall not be used except for pre-erection attachment of
fittings.
J.Provide hinged galvanized steel access and inspection doors opposite
each manual damper, at each fire damper, and at every duct mounted
control device. Doors shall be equal to Buensod-Stacey Type S-2 of rigid
construction with cast type rotary latches. Where space limitations do
not allow for full swing of the access door, two rotary type latches shall
be used. Doors located in insulated ducts shall be furnished with
extended frames to serve as a stop for insulation. Insulate doors located
in insulated ductwork. All doors shall be gasketed. Door shall be 10" by
12" minimum except where limited by duct width and shall be larger
where necessary for access to fire damper fusible links or other devices.
K.Hangers for all rectangular ducts 4 sq. ft. in area or above shall be round
bar type fastened to 1-1/4" x 1-1/4"x 1/8" angles under the ducts.
Ducts less than 4 sq. ft. in area shall be hung with black 1"x 1/16" strap
iron bent 1" under bottom side of the duct and fastened to the duct with
sheet metal screws, using not less than two screws per side and as many
more so that they are not greater than 6" centers.
L.Hangers are to be placed on not greater than 8'-0" centers or closer
where required so that the ductwork can support the weight of a man at
any point.
M.Wherever sound insulation lining is called for, the sheet metal duct size
shown on the Drawings must be increased to provide the clear inside
dimensions or cross sectional area shown on the Drawings.
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N.Duct joint sealing, reinforcing, flanges, etc. for rectangular sheet metal
ducts shall be based on maintaining airtight ducts at 2" WG Maximum
static pressure with maximum leakage of 5% of total fan capacity; 1/2 of
1% for round and oval ducts. All joints in ductwork shall be sealed with
U.L. classified United Duct Sealer, or equal.
O.Duct systems shall have sufficient volume dampers, whether or not
shown, to control and adjust the total volume of each system, each zone,
in each branch and at each diffuser or grille. Volume dampers shall be
of the butterfly type with 18 gauge galvanized iron blade. All dampers
shall be equipped with Duro-Dyne Type UNXLD locking quadrant or an
approved equal. All dampers shall be provided with damper bearings on
each end of shaft mounted on a 2" x 3" x 1/8" plate held to duct with
sheet metal screws. Maximum width of single blades shall be 14".
Splitter dampers shall not be used.
P.Provide where shown or indicated on the drawings fire and/or smoke
dampers with a UL label for not less than 1-1/2 hour fire protection
rating in accordance with UL-555 continuing inspection service. Blades
and frame shall be galvanized steel construction with blades of an inter-
locking design, having two folded guides which serve as stops. Fusible
links shall be equal to Grinnell Fig. 1351, 20 pounds, issue A. Dampers
shall be installed according to latest edition of NFPA-90A, mounted with
1-1/2" x 1-1/2" x 1/8" returning angles on both sides of partition, wall,
or floor, and sleeves as per the UL test under which the damper fire
rating was obtained. Angles shall completely close the wall opening and
provide anchorage to the dampers. Damper blade stack shall not reduce
duct free area.
Q.Apply duct liner thermal-acoustic insulation in low velocity duct systems
as shown on the drawings.
1.Duct lining shall be shop installed by the Sheet Metal
Subcontractor. Material shall be 1" nominal thickness, 3-pound
density, non-combustible glass fiber with UL approved neoprene
coating on air side.
2.Insulation shall be applied with 100% adhesive coverage, plus stick
clips on all sides of duct, 24" on center in direction of air flow, 12"
to 18" on center at right angles to air flow. Coat leading edge of
each insulation section with adhesive.
3.Lining shall be Certainteed No. 300 "Ultralite", or equal.
R.Where called for on drawings, final connections to diffusers and registers
shall be made with flexible ductwork, UL listed, Class 1. To be
Thermaflex S-LP-10 for exhaust/return, M-KA for supply or equal.
Joints shall be sealed with duct tape and Thermaflex duct straps.
Connection to rigid ductwork shall be made with spun conical taps.
S.Install duct-type smoke detectors furnished by the Electrical
Subcontractor.
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T.Factory-Fabricated Round Ductwork:
1.Round ductwork shall be constructed of galvanized steel by the
following methods and in minimum gages listed.
Minimum Gage Method of
Diameter Aluminum Manufacture
3" to 14" .032"Spiral Lockseam or equal.
15" to 26" .040"Spiral Lockseam or equal.
27" to 36".050" Spiral Lockseam or equal.
37" to 53".063"Spiral Lockseam or equal.
a.Fittings and couplings shall be constructed of minimum
gages listed. Provide continuous welds along seams.
Minimum Gage
Diameter Aluminum
3" to 50".063"
2.All branch take-offs from trunk ducts shall be made with conical
tees.
3.Subject to compliance with requirements, provide factory-
fabricated ductwork of one of the following or equal:
a.Semco Mfg., Inc.
b.United Sheet Metal Div., United McGill Corp.
c.Lindab
2.2 DUCTWORK SHOP DRAWINGS
A.Layout and details shall clearly indicate compliance with the above
Specifications. Any variations in design details, fittings, or accessory
items for which approval is requested shall be specifically marked on the
Drawings, as shall any major variations from the Drawing (minor
variations are assumed to be field conditions). Drawings for mechanical
room shall be at 3/8 in. = 1 ft. 0 in. scale. Contractor shall generate
ductwork shop drawings from a clean set of Architectural backgrounds.
Electronic ductwork drawings will not be made available to the
Contractors.
B.The Drawings shall not be submitted to the Architect for approval until
the ductwork has been coordinated with all other trades. The Sheet
Metal Subcontractor shall assume the responsibility for and bear the cost
of any alterations required after approval because of inaccurate shop
drawings or lack of proper coordination, and also for any changes in
sheet metal erected prior to approval of shop drawings.
2.3 REGISTERS AND DIFFUSERS
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A.Registers, grilles and diffusers shall be sizes as shown on the drawings.
Wall mounted registers shall have sponge rubber gaskets at perimeter of
frame. Volume dampers shall be allen key operated.
B.Colors and finishes of registers, grilles & and diffusers shall be as
selected by the Architect from the manufacturer’s standard finishes,
unless otherwise indicated.
C.Diffusers schedule is based on Titus. Price, Tutle & Bailey and Nailor are
approved equals.
D.Schedule:
1.Return and Exhaust Registers (CRR & CER): Titus model 350FL,
aluminum louver type ceiling exhaust/return register, 35 degree
louvers, ¾” blade spacing, border as required.
2.4 EXTRUDED ALUMINUM LOUVERS
A.Where called for on plans, HVAC Contractor shall furnish and install new
louvers. Louvers shall be extruded aluminum construction, equal to Ruskin
Mfg. Co. model no. ELF375DX with box frame,AMCA Licensed,4” deep,
6063-T5 extruded aluminum construction, drainable blades, ¾” aluminum
bird screen, and Kynar 500 finish in a color to be selected by the Owner
from manufacturer’s standard color table. Verify dimensions of any existing
openings in field.
B.Louvers shall be installed straight and plumb and caulked (or sealed)
around perimeter to assure adequate sealing to adjacent surfaces.
2.5 COMBUSTION AIR AND VENT PIPE (CONDENSING GAS BOILERS)
A.For condensing gas furnace units, material must be gas and liquid tight
single wall schedule 40 PVC pipe and fittings installed as per the condensing
furnace manufacturers recommendations. Material must be resistive to
corrosive flue condensate and properly supported.
B.Pipe and fittings are to comply with ASTM D1785, D2466, D2661, D2665.
PVC primer and solvent cement is to comply with ASTM D2564.
C.Connect vent piping to “concentric vent kit” provided by the furnace
manufacturer in compliance with direct-vent condensing furnaces.
D.Pipe runs are to be installed in strict accordance with the manufacturers
vertical and horizontal vent length tables and charts.
2.6 FINNED TUBE RADIATION (ALTERNATE BID NO. 1)
A.Manufacturers:
1.Rittling.
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2.Sterling.
3.Trane.
4.Vulcan.
B.Performance Ratings: Rate finned-tube radiators according to Hydronics
Institute's "I=B=R Testing and Rating Standard for Finned-Tube
(Commercial) Radiation."
C.Heating Elements: Copper tubing mechanically expanded into flanged
collars of evenly spaced aluminum fins resting on element supports.
One tube end shall be belled. Refer to equipment schedules for
additional information.
D.Element Supports: Ball-bearing cradle type to permit longitudinal
movement on enclosure brackets.
E.Front Panel Gauge: As scheduled.
F.Wall-Mounting Back Panel: Minimum 20 gage.
G.Support Brackets: Locate at maximum 36-inch (914-mm) spacing to
support front panel and element.
H.Finish: Baked enamel finish in manufacturer's standard color as selected
by Architect.
I.Enclosure Style: Gauge and type as scheduled.
J.Accessories: Filler sections, corners, relay sections, pipe hangers and
splice plates all matching the enclosure and grille finishes.
2.7 PANEL RADIATORS (BASE BID)
A.General: Provide steel panel radiator elements of lengths, locations,
capacities and style as indicated in the drawings and schedules. The wall
hung heating panel radiation shall be of one-piece all-welded steel
construction, consisting of flattened water tubes welded to headers at
each end. The radiator shall include an integral heavy gauge (0.09”
minimum) all-welded perforated top grille (for curved radiators the grille
is omitted). RF models to have steel corrugated fins welded to the rear
side of the water tubes to increase the convective output of the unit.
There shall be no less than 32 fins per foot. Fins shall start within 1” of
the headers, and shall be spot-welded three times per tube.
B.The headers shall include all necessary inlet, outlet and vent connections
as required. Standard connection sizes are ½” NPT tapered thread for
supply and return piping, and 1/8” for the vent connection. Internal
baffling is provided where required for proper water flow.
C. The radiant heating panels shall be available in lengths from 2’-0” to
29’-6” in two inch even increments without the need for splicing. The
panel radiation shall be capable of being mounted to typical stud wall
construction without additional blocking or strapping. Appropriate wall
mounting brackets or optional pedestals shall be provided with the
radiation as required.
D.Pressure ratings for the radiation, as indicated in the HVAC schedules,
shall be as follows:
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1.MEDIUM: Working pressure-85 PSI maximum, Test Pressure-110
PSI maximum
E.Panel radiation expansion shall not exceed 1/64” per foot of radiation at
215ºF. The installer shall provide adequate expansion compensation for
each radiator.
F.The panel radiation shall be cleaned and phosphatized in preparation for
the powder coat finish. The radiation is then finish painted with a gloss
powder coat finish, for a total paint thickness of 2-3 mils (0.002” -
0.003”). The color shall be selected from Runtal’s standard color table.
G.The radiator manufacturer shall provide a sample of the radiator with
grille for evaluation by the Architect/Engineer.
H.Ribbed pipe cover trims, finished to match the radiators shall be
provided with the radiation as required to suit construction.
I.Manufacturer: Subject to compliance with requirements, provide flat
tube panel radiation as manufactured by Runtal North America, Inc.
Radson shall be considered an approved equal.
2.8 HYDRONIC BOILERS
PART I -GENERAL
A.Section includes:
1.References
2.Close-out Submittals
3.Sealed Combustion Boiler(s)
4.Electrical Supply
5.Boiler Control System.
6.Execution
7.Commissioning
B.References:
1.American National Standard Institute -ANSI Z21.13-1989
Standard for Gas-Fired Low Pressure Steam and Hot Water Boilers;
ANSI Z223.1 (NFPA 54-1988) for Gas-Fired Boilers; and National
Electrical Code (NFPA 70).
2.American Society of Mechanical Engineers (ASME) Section IV of the
Boiler and Pressure Vessel Code, Rules for the Construction of
Heating Boilers.
3.American Society of Mechanical Engineers (ASME) Section VI of the
Boiler and Pressure Vessel Code, Recommended Rules for the Care
and Operation of Heating Boilers.
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4.Hydronics Institute (HI) -Testing and rating Standard for Cast Iron
and Steel Heating Boilers and the (Minimum Efficiency Standards
of) National Appliance Energy Conservation Act of 1992, effective
1 January, 1994.
5.UL 795-1989 Gas Burners, as applicable. Code of Massachusetts
248 CMR Fuel Gas Codes; 522 CMR 4.00 Rules for Steam and Hot
Water Boilers; 522 CMR 5.00 Heating Boilers; 522 CMR 16.00
Controls and Safety Devices for Automatically Fired Boilers.
6.Commonwealth of Massachusetts State Building Code, 780 CMR
Table 2011.3 Standard Rating Conditions and Minimum
Performance Gas and Oil fired Hot Water Boilers.
C.Contract close-out submittals
1.Installing Contractor shall obtain from the Boiler manufacturer
pertinent operating, testing, cleaning and maintenance
instructions for the Boilers, controls and safety devices furnished
with the Boiler(s).
2.It shall be the responsibility of the Installing Contractor to deliver
these instructions, together with complete wiring and piping
diagrams, to the Owner/User and to obtain a receipt for the
instructions. The receipt shall be filed with the installation report.
PART 2 -PRODUCTS:
A.Acceptable boiler manufacturers:
1.Burnham Corp.
2.Lochinvar
3.Utica
4.Smith
1.Weil –McLain
B.Type:
1.Provide Packaged Energy Star rated, sealed combustion, direct
vent Boiler for forced hot water heating service firing Natural Gas.
Boiler shall have been rated in accordance with D.O.E.; A.G.A.
and the Gas Appliance Manufacturers Association Furnace and
Boiler Efficiency Certification Program, and I=B=R as hereafter
specified and shown on the Contract Drawings.
C.Performance:
1.Boiler shall be design certified for installation on combustible
flooring.
2.Input, Output and combustion efficiency shall be design certified
to comply with the current edition of the Harmonized ANSI
Z21.13/CSA 4.9 Standard for Gas-Fired Low Pressure Steam and
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Hot Water Boilers. Boiler efficiency must exceed ASHRAE 90.1
and the National Energy Policy Act of 1992 requirements, and
shall be capable of providing an I=B=R Certified minimum 85%
Annual Fuel Utilization Efficiency for Natural Gas, non-
condensing, at a minimum return water temperature of 160 Deg.
F. to be approved for this Project.
D.Construction:
1.Boiler shall be manufactured of flake graphite eutectic cell cast
iron sections which shall have been subjected to a hydrostatic
pressure test of 75 PSI at the factory before assembly and each
section shall be marked, stamped or cast with the ASME Code
symbol. After section assembly, the entire block of sections shall
be hydrostatically tested at 45 PSI prior to shipment. Boiler shall
be designed in accordance with the ASME Boiler and Pressure
Vessel Code requirements for 30 PSI Maximum allowable working
pressure.
2.Individual Boiler sections shall be surface ground at the factory to
ensure smooth positive mating surfaces to ensure no high spots.
As the Boiler section assembly is to be pressed at the Factory,
machined cast iron nipples shall be utilized to assemble the
Boilers
3.Boiler shall be furnished with a Factory assembled, heavy gauge,
aluminized steel base with high temperature insulating board.
Provide stainless steel burners with air shutters which feature
smooth ignition and positive flame extinction. Burner manifold
assembly shall be arranged for a manifold pressure 3.50” Ins.
Water column.
4.Boiler shall be designed to operate under sealed combustion
characteristics with no chimney required. Induced draft fan shall
provide the means for pulling air and products of combustion
across the heat exchanger, through the Boiler flues and
exhausting the flue gases into and through the AL29-4C stainless
steel vent system. A differential pressure suction switch shall be
provided and wired into the main gas valve safety circuit along
with a Flame roll-out switch wired to interrupt burner operation in
the event of sustained flame roll-out, dire or excessive heat in the
combustion chamber.
5.Boiler insulating metal jacket shall have 1” inch thick foil backed
fibre-glass insulation and shall have a rust resistant baked enamel
finish. Boiler flue canopy shall be constructed of aluminized steel
and shall be concealed under the insulated metal jacket
6.Boiler shall be installed with isolation valves to allow the Boiler to
be isolated for repair, or drained without emptying the entire
system. Probe type Low water cutoff shall be installed in a supply
riser off the top of each Boiler in accordance with the
Manufacturers instructions and recommendations. Low water
cutoff shall be UL and FM approved, time delay shall not be
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considered acceptable.
7.Furnish and install AL29-4C Stainless Steel vent system for the
flue gas exhaust. Nonmetallic vent systems shall not be
considered acceptable. Provide approved wall thimbles, stainless
steel vent piping and install in strict accordance with the
Manufacturers installation and instructions furnished with the
Boiler. Seal all joints using Dow Corning Silastic 732 RTV; 736
RTV; Polybac #500 RTV, or Sil-bond RTV 4500. Other adhesives
or sealants not approved by the Boiler manufacturer shall not be
approved for this installation.
8.Boiler shall be arranged for concentric outside combustion air and
vent installation as shown on the Contract Drawings and in
accordance with the Boiler manufacturers instructions and
recommendations.
E.Individual Boiler trim and components shall include:
1.Pressure/Altitude gauge.
2.ASME schedule water relief valve set at 30 PSI.
3.Honeywell L4080D High Limit aquastat.
4.Induced Draft Blower, 24V Gas Valve Transformer and Fan Relay,
and Flame Roll-out switch.
5.Vent accessories including Vent Connector(s); Vent Terminal(s);
Clamps and sealants.
6.R8285D Control Center to provide DPST switching and R8222
Relay.
7.L4006E Safety high limit aquastat with manual reset.
8.One (1) M&M #750-MT-120 Low Water cutoff device with manual
reset. Probe LWCO shall incorporate a Burner circuit test switch
that, when depressed, will test out the burner control circuit by
dropping out the Burner if the circuit is properly wired. Boiler
shall be fitted with either a float type or a probe type LWCO
located above the lowest safe permissible water level established
by the Boiler manufacturer. LWCO shall be UL listed and FM
approved, suitable for commercial hydronic heating service at 80
PSI. If a float type LWCO is installed, it shall be vented at a high
point and equipped with a pair of McDonnell & Miller Test-N-
Check Model TC-4 valves. Simple time delay shall not be
considered acceptable to this installation.
9.Installing Contractor shall furnish and install a Boiler blowdown
valve, brass, ball type, not less than 3/4” IPS. Boiler
manufacturer’s standard hose bibb/drain cock shall not be
utilized.
F.Sequence of Operation:
1.At a call-for-heat, the Electronic Ignition Control system shall
engage a 30 to 45 second pre-purge interval before Trial for
Ignition. During pre-purge, a safe start component check shall be
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performed for a flame simulating condition. If a flame simulating
condition is present in the module, the heating system shall not
start. Once the Main Flame is established, should a loss of flame
occur, the main gas valve shall close with a spark re-try within 0.8
seconds. If the Pilot fails to ignite within 90 seconds, the control
system will attempt to relight after 5 minutes. Hot surface ignition
systems that do not prove the existence of a Pilot ignition prior to
lighting the Main Flame shall not be considered acceptable to this
installation.
PART 3 -ELECTRICAL SUPPLY:
A.All Boiler room wiring from the main disconnect switch panel to the
Boiler controls, Limits, Operating Controls, Low Water Cutoff Controls,
Gas Valves, Compensated Water Reset Control System, circulators,
switches and additional control devices shall be furnished and installed
under this section of the work.
B.Boiler shall be provided for operation on 1 Phase/120 Volts/60 Hz.
Complete with low voltage control transformers and relays. All safety
control switching shall be accomplished in the hot ungrounded
conductor and through the 24V low voltage wiring provided by the Boiler
manufacturer and in accordance with the manufacturer’s instructions
and recommendations.
C.Furnish and install an electrical junction box at the Boiler and equipped
with a SPST switch marked “ON/OFF” to be wired into the burner limit
circuit so as to function as a burner service switch. Switch box shall be
mounted on the Boiler jacket panel within arms reach of the burner
assemblies without obstructing cleanout panel accessibility. A manually
operated remote heating plant shutdown switch shall be furnished and
installed just outside the Boiler room door and shall be marked for easy
identification. Shutdown switch must be wired to disconnect all power to
the Boiler controls.
D.All wiring for the Boiler(s) shall be rated for the maximum operating
temperature to which it may be exposed. All wiring between
components shall have copper conductors not less than 18 AWG and
constructed in accordance with the NEC/NFPA 70. All field installed
romex, conduit, junction boxes and the like shall be installed so as not
to interfere with the Boiler manufacturers recommended cleaning and
maintenance procedures.
PART 4 -EXECUTION:
A.Provide beneath the new Boiler, a new poured and reinforced concrete
foundation pad higher than the surrounding floor (thickness as indicated
on contract drawings), and at least six inches wider than the Boiler on all
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sides. Provide four hold down bolts of at least 5/8-inch diameter into
the concrete and fastened through the base channels of the Boiler. The
concrete for the foundation pad shall be a mixture of Portland cement,
washed aggregate, and potable non-chlorinated water prepared and
poured in compliance with the American Concrete Institute Standard
318. Deliver to the Awarding Authority certification by the concrete
supplier that the mixture will attain a 28-day compressive strength of at
least 4,000 pounds per square inch. Reinforce this concrete with
Number 4 steel reinforcement bars arranged in a 12” inch by 12” inch
mesh.
B.Boiler drain valves shall be connected to the lowest water space available
and shall be installed with pipe and fittings to connect the bottom
blowoff full size to drain, size as previously specified. Blowoff valve shall
be Brass, ball type, not less than 3/4” inch IPS minimum and rated equal
to the pressure stamped on the Boiler and to a temperature rating of not
less than 250o F.and all blowdown discharges shall be arranged so as to
allow the Operator to view the water that is discharged to drain. Ends of
blowdown piping shall be cut at a 45o Degree angle to prevent a cap or
plug from being installed.
C.All Boiler discharges shall be piped to floor drains as indicated by the
Consulting Engineer. Furnish and install all necessary pipe and fittings
required to connect the pressure relief valve discharge full size
(minimum acceptable) to floor drain. Discharge shall be arranged so
that there will be no danger of scalding Boiler room personnel in the
event of a pressure relief situation. Size and arrangement of discharge
piping shall be such that any pressure that may exist or develop will not
reduce the relieving capacity of the relief valve below that required to
protect the Boiler. All such discharge piping shall be supported by
hangar or standoff to prevent the valve body from undue stress or strain.
D.Installing Contractor shall utilize capped tees at all turns in the return
piping to the Boiler for cleaning of the return piping at or near the Boiler.
Feedwater, makeup water and/or water treatment shall be introduced
into the Boiler water through the return piping only. Provisions shall be
made for the expansion and contraction of the water mains connected to
the Boiler by providing substantial anchorage at suitable points and by
providing swing joints so that there will be no stress or strain transmitted
to either the Boiler or the system piping. Stop valves shall be provided
and located at an accessible location in the supply and return piping
connections as shown on the Contract Drawings.
E.After final assembly and connection, the Boiler shall be thoroughly
cleaned internally following the manner described within the Boiler
manufacturers installation instructions, or by ASME Section VI, either
acceptable by the Awarding Authority.
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F.The process of cleaning the Boiler shall be repeated as often as
necessary and as directed by the Boiler manufacturers representative to
ensure that all mill scale, core sand, rust, dirt and debris, cutting oils and
thread sealers or any other contaminants have sufficiently been
eliminated from the Boiler and to produce a condition of the Boiler water
that is clean and considered acceptable to the Boiler representative.
G.The process of cleaning the Boiler shall include the use of a boil-out
compound of Caustic Soda or Tri-Sodium Phosphate at the rate of one
(1) pound of either chemical per 50 Gallons of total water in the system
being cleaned. This cleaning shall include Boiler Cleanout, Surface
Blowoff, Blowdown, and a wash as directed and detailed in the referenced
instructions.
H.All field tests after the Boiler has been installed and connected to the
system shall be limited to not more than 1.5 times the manufacturers
Maximum Allowable Working Pressure in accordance with the ASME
Boiler and Pressure Vessel Code. Installing Contractor shall furnish all
equipment, piping, labor, staging, fittings, valves, hoses and other
materials and shall pay all required permits for Inspection as may be
required to perform such tests as may be directed by these Contract
Documents and as required by the Boiler manufacturer’s representative
or the Boiler Inspector.
I.An initial Hydrostatic pressure test of 1-1/2 times the Max. Allowable
working pressure shall be conducted on the Boiler for a period of not
less than 5 hours. Tests shall be of such duration as necessary and as
directed by the Boiler manufacturer’s representative to ensure that the
Boiler has been installed and piped correctly with no leaks or other
improper operating conditions.
J.Installing Contractor shall contact and notify the State Boiler Inspector
when the installation of the Boiler(s), and controls is substantially
complete. Installing Contractor shall request an inspection of the
Boiler(s) to be conducted by the State Boiler Inspector and to have a
Certificate of Inspection issued upon satisfactory inspection. Certificate
issuance is mandatory to the completion of this Contract unless
specifically informed or instructed to the contrary by the State Boiler
Inspector.
K.Upon receipt of certificate of Inspection, Installing Contractor shall
furnish a suitable glass front frame in which to place said certificate.
Frame, with Inspection certificate inserted therein, shall then be placed
on or posted in a suitable location within the Boiler room in which the
new Boiler(s) have been installed.
L.Installing Contractor shall maintain all apparatus in satisfactory operating
condition. Perform periodic Burner tune-up and cleaning of the fireside
surfaces when sooty, provide preventative maintenance, perform
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turndown tests, conduct performance tests for Ignitor, Stack Damper,
Efficiency, Draft Tests, Limit Control tests and Relief Valve tests, check
the ignition system and adjust, repair or replace any as necessary while
the heating system is under his ownership and control and until such
time as the Owner accepts the equipment, issues the Final Certificate of
Payment and assumes the full obligation of Ownership.
M.Installing Contractor shall guarantee the entire installation for a period of
One (1) Year from the date of Owner Acceptance and date of Final
Payment.
PART 5 -COMMISSIONING:
A.Installing Contractor shall provide a Licensed Gas Fitter/Plumber who
shall actually perform the initial start-up, final adjusting and testing of
the Boiler and Controls in the presence of the Gas Inspector and the Gas
Company representative and the Boiler manufacturers representative.
B.Commissioning shall include the use of a Manometer while test firing the
Boiler to establish manifold operating pressure; perform Burner
Operation Tests, Control System tests and setup; Test for Venting;
Ignition Tests; and Instruction to the Owner. Include manometer test.
Provide instruction to the Owners Operating Personnel in the procedures
to resolve a “Lockout” condition. Operating personnel shall also be
instructed in the Operation and routine daily maintenance of the Boiler
and controls during the Lightoff process. The Owner shall arrange to
have the people who require training to be present at the Lightoff.
C.Installing Contractor shall provide Boiler service which shall include Labor
and Materials necessary to replace parts or controls which might fail in
service as the result of a defect in manufacture. Normal wear and tear
on parts as the result of daily operation will not be included as no charge
items (nozzles, igniters, etc.). Preventative maintenance, in the form of
yearly tune-up and bi-yearly cleanings and adjustments shall be the
responsibility of the Installing Contractor throughout the duration of the
Warranty Contract while the equipment is under his control. Preventative
maintenance, cleaning and routine adjustments shall be performed by
the Owners obligated Service Company.
2.9 PIPE SLEEVES
A.Standard IPS steel sleeves shall be provided wherever exposed pipes pass
through masonry walls or partitions. Pipe sleeves are to be two pipe sizes
larger than line size. Insulated piping sleeves shall be sized to allow
insulation to pass through the sleeve without gouging.
2.10 HANGERS
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A.Hangers shall be as manufactured by Grinnell Company, Carpenter &
Paterson, Fee & Mason, or equal.
B.For all pipe 2-1/2" and larger -Grinnell Figure No. 20, at 10' intervals.
C.For all other suspended piping -Grinnell Figure 70 at 6' intervals for tubing
1-1/4" or less, 10' intervals for piping at 1-1/2" and larger.
D.All hangers directly in contact with non-ferrous pipe or tubing shall be
copper plated or plastic coated.
E.Hangers or supports shall be placed within 1' of each horizontal elbow.
Vertical runs of pipe not over 5' in length shall be supported on hangers
placed not over 12" from the elbow on the connecting horizontal run.
F.Install Figure 167 insulation shield between hanger and insulation on all
piping; hangers to be installed outside pipe insulation.
G.Vertical risers shall be supported with Grinnell Figure CT-121C plastic
coated riser clamp; to be installed immediately below a coupling.
2.11 VALVES
A.All valves shall be of the same make except as noted below for special valves
and shall be Crane, Watts, Walworth, or Tour & Anderson manufacture based
on the following Stockham valves.
B.All water valves installed in copper tube piping shall be, in general, solder
end pattern, all bronze with iron hand wheel, rated for not less than 200
pounds non-shock water pressure. In general, all line service valves are to
be gate valves, manual vents are to be globe type.
C.Solder end valves are as follows:
1.Gate Valves -Stockham Figure B-109.
2.Globe Valves -Stockham B-14T.
3.Check Valves -Stockham B-309.
4.Drain Valves -Watts No. B-6000 ball valve with hose adapter, cap
and chain.
5.Ball Valves -Watts Series B-6001-SS-XH.
D.Screw end and flanged valves shall be as follows:
1.Gate: 2-1/2 in. and smaller -Stockham Figure B-120; 3 in. and
larger -Stockham Figure G-620 or G-623.
2.Globe: 2-1/2 in. and smaller -Stockham Figure B-120 or 752; 3 in.
and larger -Stockham Figure G-609 or G-613.
3.Check: 2-1/2 in. and smaller -Stockham Figure B-319; 3 in. and
larger -Stockham Figure G-931.
4.Ball Valves: Watts Series 600-SS-SH.
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E.All shut-off valves 2-1/2 in. and larger shall be Watts Series G-4000, cast
iron body, 316, steel disc and shaft, Nordel EPT seat, designed for
bubbletight shutoff. Valves to be fitted with lever operator for two position
operation.
F.Gate and/or globe valves shall not be used as substitutes for the following
valves when used as balance valves.
G.Balance and/or shut-off valves 4 in. and larger -Tour & Anderson Series
STAF or equal by Macon, neoprene seat, semi-steel body, with stainless
steel or bronze top and bottom bushings, 150 psig working pressure, 125
pound ANSI flanges, Figure 101F or 118F, G6-HI2. Provide open position
stop on all valves. Provide hand operators for all valves which are 6 ft. or
more above the floor.
H.Balance and/or shut-off valves 2-1/2 in. and 3 in. sizes -Tour & Anderson
Series STAF or equal by Macon, lever operated, faced plug, neoprene seat,
semi-steel body with stainless steel or bronze top and bottom bushings,
150 psig working pressure, Figure 118. Provide open position stops for all
valves.
I.For 2 in. and smaller -Balancing valves shall be Tour & Anderson Figure
STAD or STA-D or equal by Macon, semi-steel body, bronze plug with
neoprene or Teflon resilient face, bronze top and bottom bushings,
complete with lever. Provide open position stop and plastic cap on all valves
which are labeled "Balance Valves" on the Drawings. All valves at fan coil
unit shall be furnished with drain kit.
J.Pump discharge check valves shall be Muessco, Williams & Hager, or
Smolensky equal to Muessco 105-DT silent type, steel body, stainless steel
trim and spring, renewable seat, 150 psig ASME rated.
2.12 THERMOMETERS
A.Approved Manufacturers:
1.Ashcroft.
2.Palmer-Wahl Instruments Inc.
3.Trerice.
4.Weiss Instruments, Inc.
5.Weksler Instruments.
B.Case: Die-cast aluminum, 9-inches long when installed below 8’-0”AFF;
12-inches long when installed above 8’-0”AFF.
C.Tube: Red or blue reading, organic-liquid filled, with magnifying lens.
D.Tube Background: Satin-faced, nonreflective aluminum with
permanently etched scale markings.
E.Window: Glass.
F.Connector: Adjustable type, 180 degrees in vertical plane, 360 degrees
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in horizontal plane, with locking device.
G.Stem: Copper-plated steel, aluminum, or brass for thermowell
installation and of length to suit installation.
H.Accuracy: Plus or minus 1 percent of range or plus or minus 1 scale
division to maximum of 1.5 percent of range.
I.Install thermometers in the following locations, whether or not indicated
on the drawings:
1.Inlet and outlet of each hydronic zone.
2.Inlet and outlet of each hydronic boiler and chiller.
3.Inlet and outlet of each hydronic coil in air-handling units and
built-up central systems.
4.Inlet and outlet of each hydronic heat exchanger.
5.Inlet and outlet of each hydronic heat-recovery unit.
6.Inlet and outlet of each thermal storage tank.
7.Suction and discharge of each pump.
J.Provide the following temperature ranges for thermometers:
1.Heating Hot Water and Dual-Temperature Heating/Cooling Water:
30 to 240 deg F, with 2-degree scale.
2.Condenser Water: 0 to 160 deg F, with 2-degree scale divisions.
3.Chilled Water: 0 to 100 deg F, with 2-degree scale divisions.
2.13 PRESSURE GAUGES
A.Approved Manufacturers:
1.Ashcroft
2.U.S. Gauge.
2.Ernst Gage Company.
3.Weiss Instruments, Inc.
4.Trerice.
B.Direct-Mounting, Dial-Type Pressure Gages: Indicating-dial type
complying with ASME B40.100.
1.Case: Dry type, drawn steel or cast aluminum, 4-1/2-inch
diameter.
2.Pressure-Element Assembly: Bourdon tube, unless otherwise
indicated.
3.Pressure Connection: Brass, NPS ¼”, bottom-outlet type unless
back-outlet type is indicated.
4.Movement: Mechanical, with link to pressure element and
connection to pointer.
5.Dial: Satin-faced, nonreflective aluminum with permanently
etched scale markings.
6.Pointer: Red metal.
7.Window: Glass.
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8.Ring: Metal.
9.Accuracy: Grade B, plus or minus 2 percent of middle half scale.
10.Vacuum-Pressure Range: 30-in. Hg of vacuum to 15 psig of
pressure.
11.Range for Fluids under Pressure: Two times operating pressure.
C.Pressure-Gage Fittings:
1.Valves: NPS ¼” brass or stainless-steel needle type.
2.Syphons: NPS ¼” coil of brass tubing with threaded ends.
3.Snubbers: ASME B40.5, NPS ¼”brass bushing with corrosion-
resistant, porous-metal disc of material suitable for system fluid
and working pressure.
D.Install gauges in the following locations, whether or not indicated on the
drawings:
1.Discharge of each pressure reducing valve.
2.Inlet and outlet of each hydronic boiler and chiller.
3.Inlet and outlet of each hydronic coil in air-handling units and
built-up central systems.
4.Inlet and outlet of each hydronic heat exchanger.
5.Suction and discharge of each pump.
2.14 UNIONS
A.Unions shall be of the same class and material as the pipe and fittings of the
system in which they are installed. In black steel piping systems, they shall
be 200 lb. black malleable iron with brass ground joint equal to Dart Figures
0832, 0834, 0835, 0836 or 0838. In copper and brass piping, they shall be
125 lb. bronze or brass with ground joint.
B.Flanged unions for welded pipe shall be weld neck, 150 lb. raised face.
Flanged joints shall be packed with impregnated asbestos gaskets placed
inside the bolt circle with graphite applied to both faces.
C.Dielectric unions shall be provided between ferrous and non-ferrous piping
to prevent galvanic corrosion. The dielectric unions shall meet the
requirements for tensile strength of pipe fittings in accordance with Federal
Specification WW-U-531 and shall be suitable for temperatures and
pressures encountered. The ends shall be threaded, flanged, brazed, or
soldered to match adjacent piping. The metal parts of the union shall be
separated so that the electrical current is below l percent of the galvanic
current which would exist with metal to metal contact.
2.15 HOT WATER SPECIALTIES AND VALVES
A.Expansion tank fitting shall be Taco "Taco-Trol" No.438.
B.Tank drainer shall have drain body with air vent tube, Taco No. 440, with
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hose end drain valve. Pipe with auxiliary drain to within 6 ft.-0 in. of finish
floor.
C.Tangential-Type Air Separators: Welded black steel; ASME constructed
and labeled for 125-psig minimum working pressure and 375 deg F
maximum operating temperature; perforated stainless-steel air collector
tube designed to direct released air into expansion tank; tangential inlet
and outlet connections; threaded connections for NPS 2 and smaller;
flanged connections for NPS 2-1/2 and larger; threaded blowdown
connection. Provide units in sizes for full-system flow capacity, as
manufactured by SpiroVent.
D.Expansion Tanks: Welded carbon steel, rated for 125-psig working
pressure and 375 deg F maximum operating temperature. Separate air
charge from system water to maintain design expansion capacity by a
flexible diaphragm or bladder as indicated in the schedules, securely
sealed into tank. Include drain fitting and taps for pressure gage and
air-charging fitting. Support vertical tanks with steel legs or base;
support horizontal tanks with steel saddles. Factory fabricate and test
tank with taps and supports installed and labeled according to the ASME
Boiler and Pressure Vessel Code, Section VIII, Division 1.
E.Equivalent products for items A through D as manufactured by Bell &
Gossett, Amtrol,Armstrong, Taco or equal will be approved.
F.Air Vents: Air vents shall be provided where shown and at all other high
points, where shown or not. Vents shall be of the manual type and shall be
full line size, but in no case shall they be less than 2 in. steel pipe.
Chambers shall be a minimum of 12 in. high. Drain tubing shall be
extended in such a manner that the globe valve and end of drain line are
readily accessible. Air vents for radiation shall be installed in the return side
of each loop of radiation before piping drops down to return main. These
vents to be key or screw type equal to Dole or Taco.
G.Automatic Make-Up Water Valve: Provide with three valve bypass for water
system shall be Bell & Gossett, Cash, Taco, or Watts equal to Bell & Gossett
No. B-3 Reducing Valve set for approximately 60 psig inlet and 20 psig
outlet, field adjustable. Install backflow preventer piped to drain in inlet to
automatic valve. Bypass to be 1 in. size with globe valve and one check
valve in series. Strainers shall be as specified in other paragraphs of this
Section of the Specifications.
H.Furnish and install all temperature -pressure relief valves for all hot water
heater systems. All to be ASME rated and similar to that manufactured by
WATTS.
I.Bypass Chemical Feeder: Welded steel construction; 125-psig working
pressure; 5-gallon capacity; with fill funnel and inlet, outlet, and drain
valves. Chemicals: Specially formulated, based on analysis of makeup
water, to prevent accumulation of scale and corrosion in piping and
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connected equipment.
J.Flexible Connectors: Stainless-steel bellows with woven, flexible,
bronze, wire-reinforcing protective jacket; 150-psig minimum working
pressure and 250 deg F maximum operating temperature. Connectors
shall have flanged-or threaded-end connections to match equipment
connected and shall be capable of 3/4-inch misalignment.
K.Safety Valves: Diaphragm-operated, bronze or brass body with brass
and rubber, wetted, internal working parts; shall suit system pressure
and heat capacity and shall comply with the ASME Boiler and Pressure
Vessel Code, Section IV.
L.Triple-Duty Valve: Angle or straight pattern, 175-psig pressure rating,
cast-iron body, pump-discharge fitting; with drain plug and bronze-
fitted shutoff, calibrated balancing, and non-slam check valve features.
Brass gage ports with integral check valve, and orifice for flow
measurement. Valve design shall permit re-packing under full system
pressure. Size valve for minimum 1 psi drop across valve at 100 percent
open per manufacturer’s recommendations and to achieve balance point
in mid-range of valve. Cv rating shall be provided at every 10 percent
increment opening for the valve. Manufacturer shall supply the Cv rating
for read-out of flow determination and system pressure drop.Furnish
and install at each pump discharge. Triple duty valves shall be Bell &
Gossett, Armstrong, Taco, or approved equal.
2.16 IN-LINE CENTRIFUGAL PUMPS
A. Approved manufacturers:
1.Bell & Gossett
2.Armstrong
3.Taco
4.Grundfos
B.Description: Factory-assembled and -tested, centrifugal, overhung-
impeller, close-coupled, in-line pump;designed for installation with
pump and motor shafts mounted horizontally or vertically. Rate pump
for 125-psig minimum working pressure and a continuous water
temperature of 225 deg F.
C.Pump Construction:
1.Casing: Radially split, cast iron, with replaceable bronze wear
rings, threaded gage tappings at inlet and outlet, and threaded
companion-flange or union end connections.
2.Impeller: ASTM B 584, cast bronze; statically and dynamically
balanced, keyed to shaft, and secured with a locking cap screw.
Trim impeller to match specified performance.
3.Pump Shaft: Steel, with copper-alloy shaft sleeve.
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4.Mechanical Seal: Carbon rotating ring against a ceramic seat held
by a stainless-steel spring, and Buna-N bellows and gasket.
Include water slinger on shaft between motor and seal.
5.Pump Bearings: Permanently lubricated ball bearings.
D.Motor: Single speed,premium efficiency with grease-lubricated ball
bearings and rigidly mounted to pump casing. The horsepower of the
motor shall be of such a size as to insure non-overloading of the motor
throughout the pump curve without the use of motor service factor.
2.17 PIPE AND FITTINGS
A.General
1.Reference is made to specifications of recognized authorities to
establish quality. Latest editions of their publications at time of bid-
ding shall be in force.
2.All piping shall have manufacturer's name or trademark rolled into
each and every length of pipe.
3.All threads for screwed joints shall be National Taper Pipe Thread
conforming to ANSI B2.1-1968.
4.Qualify welding procedures, welders and operators in accordance
with ASME B31.1, or ASME B31.9, as applicable, for shop and project
site welding of piping work.
5.Note: Grooved mechanical joint piping systems/fittings/couplings
will NOT be allowed.
B.Application
1.Heating Hot Water: Black steel pipe, Schedule 40, size 2" and smaller
threaded, 2-1/2" and larger welded, or Type "L" copper for piping 2”
and smaller.
2.Make-Up Water: Type "L" copper.
3.Refrigerant: Type ACR copper, wrought copper fittings, AWS class
BAgl silver solder.
4.Condensate Drain (from cooling coils): Type M or DWV copper
tube with cast or wrought drainage fittings.
C.Materials
1.Black Steel Pipe : ASTM A53, A106 or A120; except comply with
ASTM A53 or A106 where close coiling or bending is required.
2.Malleable-Iron Threaded Fittings: ANSI B16.3; plain or galvanized as
indicated. Class 150 for Schedule 40 piping, Class 300 for Schedule
80.
3.Yoloy Steel Pipe: ASTM A714; Class 4; Grade IV.
4.Steel Flanges/Fittings: ANSI B16.5, including bolting and gasketing
of the following material group, end connection and facing except as
otherwise indicated, Class 150 for Schedule 40 piping, Class 300 for
Schedule 80.
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a.Material Group: Group 1.1
b.End Connections: Buttwelding
c.Facings: Raised-face
5.Wrought-Steel Buttwelding Fittings: ANSI B16.9, except ANSI B16.28
for short-radius elbows and returns; rated to match connected pipe.
6.Yoloy Steel Buttwelding Fittings: ASTM A714.
7.Forged Branch Connection Fittings: Except as otherwise indicated,
provide type as determined by Installer to comply with installation re-
quirements, Bonney "Weldolets" or "Threadolets", or equal.
8.Pipe Nipples: Fabricated from same pipe as used for connected pipe;
except do not use less than Schedule 80 pipe where length
remaining unthreaded is less than 1-1/2" and where pipe size is less
than 1-1/2", and do not thread nipples full length (no close-nipples).
9.Copper Tube: ASTM B88; Type as indicated for each service;hard-
drawn temper for water piping; soft temper for oil piping.
10.DWV Copper Tube: ASTM B306.
11.ACR Copper Tube: ASTM B280.
12.Wrought-Copper Solder-Joint Fittings: ANSI B16.22.
13.Cast-Copper Solder-Joint Drainage Fittings: ANSI B16.23.
14.Wrought-Copper Solder-Joint Drainage Fittings: ANSI B16.29.
15.Red Brass Pipe: ASTM B43.
16.Cast-Bronze Threaded Fittings: ANSI B16.15.
17.Welding Materials: Except as otherwise indicated, provide welding
materials as determined by Installer to comply with installation
requirements. Comply with Section II, Part C, ASME Boiler and
Pressure Vessel Code for welding materials.
18.Soldering Materials: Except as otherwise indicated, provide soldering
materials as determined by Installer to comply with installation re-
quirements.
19.Brazing Materials: Except as otherwise indicated, provide brazing
materials as determined by Installer to comply with installation
requirements. Comply with SFA-5.8, Section II, ASME Boiler and
Pressure Vessel Code for brazing filler metal materials.
20.Gaskets for Flanged Joints: ANSI B16.21; full-faced for cast-iron
flanges; raised-face for steel flanges, unless otherwise indicated.
2.18 STRAINERS
A.Pipeline strainers shall be full size, iron body, "Y" pattern and shall be
installed on the inlet side of each steam trap, and elsewhere as indicated on
the Drawings. Strainers 2" and smaller shall have screwed ends; 2-1/2" and
larger shall have flanged ends.
2.19 ACCESS PANELS
A.Furnish and install access panels at all valves, volume dampers, etc.
installed above plastered ceilings, in walls, and all other non-accessible
spaces. Access panels in plastered ceilings shall be Karp Type DSC-214
PL (12"x 12"); access panels in walls shall be Karp type DSC-211
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"Universal" (12" x 12"). Fire rating of access panel shall match the fire
rating of wall/ceiling/floor it is installed in.
2.20 INSULATION
A.All new air supply, return and outdoor air ducts shall be insulated.
Insulation for concealed ducts shall be 1-1/2 in. thick, 1 pound density
glass fiber (flexible) duct insulation with factory applied reinforced
aluminum foil jacket equal to Manville Type FSK. Secure to duct with
Benjamin Foster No. 85-20 adhesive. Lap jacket 2 in. at all seams and
secure flaps with staples and adhesive to provide complete vapor barrier. In
addition, this concealed duct insulation shall be tied 18 in. o.c. with 18
gauge aluminum or copper wire where ducts exceed 24 in. in width.
B.All concealed air ducts from the outdoor air intakes to the air handling units
shall be insulated in the same manner as for the ductwork for concealed
supply ducts.
C.All exposed supply, return and outside air ducts shall be insulated with 1 ½
in. thick, 6 pound density, rigid glass fiberboard with Manville Type EAF
vaporseal facing.Ductwork with internal acoustic lining in conditioned
spaces are not required to be externally insulated.All exposed supply,
return, outside air and exhaust ducts serving energy recovery units located
in un-insulated attics shall have two layers of 1 ½ in. thick, 6 pound density,
rigid glass fiberboard with Manville Type EAF vaporseal facing.Ductwork
with internal acoustic lining in un-heated attic spaces must also be
externally insulated with one (1) layer of 1 ½” thickness, 6 pound density
insulation. Attach board to ducts with double prong stick clips. Seal at
joints to maintain vapor barrier. All edges and angles shall be reinforced
with corner beads. Finish shall consist of tackboard of Benjamin Foster No.
30-36 Sealfas, embedded Manville Duramesh 205, and a heavy finish coat
of Benjamin Foster No. 30-35 Sealfas, all applied according to
manufacturer's recommendations.
D.Pipe Insulation: New piping in all locations shall be insulated.
1.All insulation including covering shall be fire resistant and fire
retardant and shall have a flame spread rating not exceeding 25,
smoke developed rating not exceeding 50, all complying with NFPA
225 and/or U.L. 723. Adhesives used for applying and sealing
jackets shall also conform to these same fire retardant and smoke
ratings.
2.On exposed insulation, all longitudinal seams shall be kept at the top
of the pipe and circumferential joints shall be kept to a minimum.
Raw ends of insulation shall be concealed by neatly folding in the
ends of the jackets. Fittings, valve bodies, and flanges shall be
furnished with the same jacket materials used on adjoining insula-
tion.
3.Covering shall not be applied until all parts of the work have been
tested by the Contractor and approved by the Engineer.
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4.A vapor barrier shall be installed on all new heating hot water supply
and return, refrigerant suction piping, condensate drain piping and
make-up water piping. It shall be applied in accordance with the
manufacturer's instructions to maintain the integrity of the vapor
barrier.
5.Attention is called for to the fact that on all heating hot water supply
and return, chilled water supply and return, dual temperature
heating/cooling water supply and return, refrigerant suction piping,
condensate drain piping and make-up water piping, oversized pipe
hangers shall be furnished and pipe insulation shall be applied
continuous along the pipe passing inside the hanger.
6.All heating hot water supply and return, refrigerant suction piping,
condensate drain piping and make-up water shall be insulated with
Manville FLAMESAFE fiberglass pipe insulation, Owens-Corning
fiberglass 25, or approved equal. The insulation shall have an
average thermal conductivity not to exceed .25 BTU in. per sq. ft. per
F. per hour at a mean temperature of 75 degrees F. Thickness of the
insulation shall be as scheduled below. Jacket shall be FLAMESAFE
AP. The insulation shall be applied over clean dry pipe with all joints
firmly together. Longitudinal jacket laps and the butt strips shall be
smoothly secured with Benjamin Foster 85-20 adhesive.
7.Exterior refrigerant piping insulation shall be covered with an
aluminum jacket, sealed and waterproofed for exterior installation.
E.Insulation thickness shall be as follows:
Minimum Pipe Insulation Required:
1. Heating Hot Water:
a.Runouts up to 2 in.: 1-1/2 in. thickness
b.Mains 1 in. and less: 1-1/2 in. thickness
c.Mains 1-1/4 in. to 2 in.: 2 in. thickness
d.Mains 2 ½” and larger: 2 in. thickness
2.Equipment:
a. Air separators: 1-1/2 in. thickness
3. Tubing:
a.½ thick Armoflex insulation.
4.Drains and vents from hot water, chilled water, steam and
condensate return systems:
a.All sizes: 1 1/2 in. thickness
5.Condensate drains and make-up water piping:
a.All sizes: ¾ in. thickness
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2.21 AUTOMATIC TEMPERATURE CONTROL (ATC)
A.Scope of Work
1.All temperature control work shall be performed by this
Contractor. It is the responsibility of this Contractor to coordinate
all HVAC work with the Temperature Control Contractor prior to
submitting a bid.
2.The Contractor shall furnish and install all necessary wiring,
pneumatic tubing, computing equipment and software as defined
in this specification.
3.All material and equipment used shall be standard components,
regularly manufactured and available and not custom designed
especially for this project. All systems and components, except
site specific software, shall have previously been thoroughly
tested and proven in actual use prior to installation on this
project.
4.The system, upon completion of the installation and prior to
acceptance of the project, shall perform all operating functions as
detailed in this Specification.
5.Codes and Regulations. All electrical equipment and material and
its installation shall conform to the current requirements of the
following authorities:
a.Occupational Safety and Health Act (OSHA)
b.National Electric Code (NEC)
c.National Fire Code
d.Uniform Building Code
e.Uniform Mechanical Code
f.Uniform Plumbing Code
g.UL916
h.Note: Where two or more codes conflict, the most
restrictive shall apply. Nothing in these plans and
specifications shall be construed to permit work not
conforming to applicable codes.
B.Submittals, Documentation and Acceptance
1.Shop Drawings. A minimum of six (6) copies of Shop Drawings
shall be submitted and shall consist of a complete list of
equipment and materials, including manufacturer's descriptive
and technical literature, catalog cuts, and installation instructions.
Shop Drawings shall also contain complete wiring, routing,
schematic diagrams, tag number of devices, software descriptions,
calculations, and any other details required to demonstrate that
the system will function properly. Drawings shall show proposed
layout and installation of all equipment and the relationship to
other parts of the work.
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2.Shop Drawings shall be approved by the Engineer and the Owner’s
before any equipment is installed. Therefore, Shop Drawings
must be submitted in time for review so that all installations can
be completed per the project's completion schedule.
3.All Drawings shall be reviewed after the final system checkout and
updated or corrected to provide "as-built" Drawings to show exact
installation. The system will not be considered complete until the
"as-built" Drawings have received their final approval. The
Contractor shall deliver three (3) sets of "as-built" Drawings, and
one (1) CADD disk of these Drawings.
C.Wiring: All temperature control wiring will be installed and terminated by
the ATC Contractor. Control wiring shall be as follows:
1.All circuits which are activated or deactivated by temperature
control system components, such as, but not limited to, PE's and
high and low limit protective devices.
2.All circuits which activate or deactivate temperature control
system components, such as solenoid air valve.
3.All temperature control panel wiring to terminal strips and field
wiring from terminal strips to field mounted devices.
4.All wiring to the "Auto" side of hand-off auto switches on units
being controlled by the ATC Contractor.
5.Wiring of all electro-mechanical devices required to be located on
or in temperature control panels.
6.All wiring to the temperature control panels shall be by the ATC
subcontractor from sources provided by the Electrical Contractor
specifically for that purpose.
7.All wiring shall comply with national, state, and local electrical
codes. All power wiring will be installed and terminated by the
Electrical Contractor. Power wiring shall be defined as follows:
a.Wiring of all devices and circuits carrying voltages greater
than 120 volt (except for power to the temperature control
panels).
b.Wiring of power feeds to disconnects, starters, and electric
motors.
c.Wiring of 120V AC power feeds to all temperature control
panels where required.
d.Installation of and wiring of line power to fused disconnects
for each air compressor.
e.Power wiring to 120V single phase motors.
f.Wiring from disconnects to compressor motor starters and
from compressor motor starters to compressor motor.
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D.Sequences of Operation:
1.Typical Residential Boiler Plant Control:
a.Each apartment is equipped with a new gas-fired hydronic
boiler which provides building heating and domestic hot
water generation. Each boiler system has two (2) pumps;
one for the heating loop and one for the domestic water
heater.
b.Boiler Control.
1.The boiler shall be controlled by a manufacturer
provided Tekmar hard-wired control system. The
boiler shall be enabled on a call for heating or
domestic hot water.
2.The boiler is equipped with a single-stage gas
burner. On a call for heat the heating pump shall be
energized. Once flow is proven through the boiler
via flow switch the boiler controller shall stage the
gas burner as required to maintain HWS temperature
setpoint according to the following reset schedule:
a.Outdoor air temperature 20°F (adjustable): hot
water supply temperature: 180°F (adjustable).
b.Outdoor air temperature 65°F (adjustable): hot
water supply temperature 150°F (adjustable).
3.During the unoccupied mode the boiler controller
shall reduce the supply water temperature by a pre-
determined amount.
4.Control of burner lighting, flame safeguard and
firing rate shall be by burner manufacturer provided
control systems.
5.If a fault occurs on the boiler an alarm contact shall
close in order to signal the alarm condition to a local
alarm bell. Local alarm bell shall be furnished and
installed by the temperature controls contractor.
c.Domestic Hot Water Pump Control.
1.The boiler controller is equipped with a domestic hot
water priority control function. The controller
continuously monitors the domestic hot water
temperature at the storage tank.Temperature
sensor furnished and installed by the ATC
Contractor.As the domestic hot water temperature
falls below setpoint (120 degrees F, adjustable) the
controller shall de-energize the main heating pump
and energize the domestic hot water pump. Boiler
shall enable and operate as required to satisfy the
domestic hot water demand. The priority control
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function shall override reset hot water supply
setpoint and operate the boiler at a hot water supply
temperature of 180 degrees F (adjustable). Once the
domestic hot water tank temperature is satisfied the
water heater pump shall de-energize, the main
heating pump shall energize and the hot water
supply temperature setpoint shall return back to the
calculated setpoint.
d.Boiler Safeties.
1.ATC Contractor shall furnish and install a manually
operated remote heating plant shutdown switch just
outside of each boiler room door. Refer to drawings
for switch locations. Switches shall be marked for
easy identification. Shutdown switches shall be
wired to disconnect all power to the respective boiler
controls.
2.Typical Electric Cabinet Unit Heaters (ECUH’s), Electric Unit Heaters
(EUH’s) and Electric Wall Heaters (EWH’s): Heaters shall be
controlled by a factory mounted and wired thermostats. On a call
for heat the unit fan shall cycle and stages of electric heat shall be
energized.
E.Adjustment and Calibration:
1.On completion of the job, the ATC Contractor shall completely
calibrate, test, and adjust, ready for use, all electronic controls,
thermostats, valves, damper motors, and relays provided under
his contract and be present for functional tests on systems.
2.Before the Engineer is asked to witness the functional tests, the
entire control and management system must be complete,
controls calibrated. The controlled devices will be physically
inspected and checked to assure that these terminal devices are,
in fact, under proper control and working smoothly over their
entire range of operation.
3.The adjustment procedure shall include the following steps:
a. Preliminary set up and calibration per Specifications and
Shop Drawings.
b. Physical checkout of all components for completeness and
accuracy, simultaneously with mechanical system
balancing.
c. Review of system with Engineer.
d.Functional test for Owner's benefit, instruction, and
acceptance.
e.Not less than 30 or more than 60 days after systems have
been in full operation, review problems with Owner,
recheck all adjustments,and recalibrate as required.
4.The Control Manufacturer shall provide a complete instructional
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manual covering the function and operation of all control and
management system components on the job, which shall include a
trouble-shooting and operating procedure. This manual shall be
furnished to the Owner's operating personnel and shall show the
total integrated control system. Competent technicians shall be
provided for instruction purposes. The Control Manufacturer shall
furnish schematic systems control diagrams to be delivered to the
Owner on AutoCAD disks.
5.Control and management systems shall neither be considered
complete nor acceptable until all conditions of the Sequence of
Operation have been attained, all temperatures are maintained
within specified limits of all operating conditions, and all
systems damper leakage of controlled within specified limits.
F. Service and Guarantee:
1.The complete installation, including all equipment, shall be
guaranteed free from defects in workmanship and material for a
period of 12 months from date of acceptance in writing by the
Owner. Provide at no cost to the Owner, all necessary service,
adjusting, and checking during the 12 month guarantee period.
2.During warranty period, the ATC Contractor shall update and
implement all latest revisions of software offered by the
Contractor that applies to this Project.
PART 3 -INSTALLATION
3.1 CLEANING AIR SYSTEM
A.No air-handling units shall be run for temporary heating, ventilating,
testing, or otherwise without filters in place.
B.Upon completion of construction and before testing, the interior of all air
handling units and plenums shall be vacuum cleaned to remove all
construction dirt, dust, etc. before the units are turned on, and clean filters
shall be installed.
3.2 CUTTING, PATCHING AND DRILLING
A.Drilling of all holes 3 ½ " diameter and smaller required for the installation of
heating and ventilating piping and equipment shall be performed by the
HVAC Subcontractor.
Cutting and patching of holes 4” diameter and larger shall be performed by
the General Contractor in accordance with the General Conditions. All work
and materials shall be installed in such a manner and at such time to keep
cutting and patching to a minimum. Location for chases, openings, etc. shall
be checked by the HVAC Subcontractor, and error due to failure to co-
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ordinate work with other Divisions shall be the responsibility of the HVAC
Subcontractor, who shall make the corrections as his own expense.
B.Work shall include furnishing and locating inserts required before the floors
and walls are built, or be responsible for the cost of cutting and patching
required for pipes where sleeves and inserts were not installed, or where
incorrectly located. The HVAC Subcontractor shall do all drilling required for
the installation of hangers. Patching of all holes, after installation of piping or
equipment shall be performed by the General Contractor.
C.As the work nears completion, all pipe cutting and threading, etc. shall be
done in a location approved by the Architect.
D.No pipe cutting or threading shall be done in areas where completed concrete
floor slab is to remain as finished or be painted later. Should use of such an
area be necessary, the HVAC Subcontractor shall cover the working area with
canvas tarpaulins in an approved manner.
3.3 PIPE INSTALLATION
A.All piping shall be run true and straight at proper pitch without strain and
shall be firmly supported throughout. Provision for expansion and
contraction shall be made with offsets or expansion loops. All pipe shall be
cut off clean and threaded with sharp dies, reamed and burrs removed.
B.Where screwed fittings are used, bushings shall not be used from branch
connections or reducers. Connections to equipment shall be full size of
tappings. Reductions in the run of pipe shall be made with eccentric or
concentric reducers as required for draining and venting.
C.All piping shall be run concealed throughout finished spaces either in furred
spaces, shafts, chases, or above hung ceilings.
D.Special care must be taken throughout the equipment rooms, vertical pipe
shafts, above hung ceilings, and elsewhere throughout all floors to maintain
maximum headroom and clearances for access to other equipment and to
avoid conflict with electrical conduits, lighting fixtures, other piping, ducts,
and equipment of other trades.
E.Connections to equipment shall be made with unions or flanges to permit
future replacement, removal and servicing of equipment. Flexible
connections where required to isolate movement of equipment from piping
system or of piping system from equipment, shall be as specified.
F.Before any part of the various piping systems is placed in operation, blow out
piping with compressed air and/or water to remove all chips and scale and
flush and drain until all traces of dirt, scale and other foreign matter have
disappeared. Refer to other sections for additional requirements.
G.Vent all high points and drain all low points throughout the system.
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3.4 PIPING SYSTEM TESTS
A.All piping installed on the project, unless specifically shown otherwise, shall
be hydraulically tested as specified herein. The HVAC Subcontractor shall
provide all equipment required to make the tests specified herein. Piping
may be tested a section at a time in order to facilitate the construction.
B.The HVAC Subcontractor shall fill the section of pipe to be tested with water
and bring the section up to pressure with a test pump. These tests shall be
conducted before any insulation is installed and any insulation installed prior
to these tests shall be removed. Gauges used in the tests shall have been
recently calibrated with a dead weight tester.
C.Subject piping system to a hydrostatic test pressure which at every point in
the system is not less than 1.5 times the design pressure. The test pressure
shall not exceed the maximum pressure for any vessel, pump, valve, or other
component in the system under test. Make a check to verify that the stress
due to pressure at the bottom of vertical runs does not exceed either 90% of
specified minimum yield strength, or 1.7 times the "SE" value in Appendix A
of ASME B31.9, Code for Pressure Piping, Building Services Piping.
D.After the hydrostatic test pressure has been applied for at least 10 minutes,
examine piping, joints, and connections for leakage. Eliminate leaks by
tightening, repairing, or replacing components as appropriate, and repeat
hydrostatic test until there are no leaks.
E.After system has been determined to be leak-free, the Architect shall be
notified and the test shall be repeated in his or his representative's presence.
F.When delicate control mechanisms are installed in the piping system, they
shall be removed during the tests to prevent shock damage. This does not
apply to control valves.
G.Leaks developing subsequent to these tests shall not be repaired by mastic or
other temporary means. All leaks shall be repaired by removal of the valve,
fitting, joint, or section that is leaking and reinstalling new material with joints
as specified herein before.
3.5 INSTALLATION OF PUMPS
A.Install in-line pumps where indicated, in accordance with manufacturer's
published installation instructions, complying with recognized industry
practices to ensure that pumps comply with requirements and serve intended
purposes.
B.Provide access space around pumps for service, maintenance and removal
indicated, but in no case less than that recommended by manufacturer.
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C.In-line pumps, in general, shall be supported from piping system. Provide
additional hanger as required. Where necessary, provide additional support
to ensure proper alignment. Install each pump with isolating valve unions or
flanges in piping connection to permit removal. Refer to Section 15100 for
piping, valves, gauges and accessories.
D.Install electrical devices furnished by manufacturer but not specified to be
factory mounted. Furnish copy of manufacturer's wiring diagram submittal to
Electrical Installer. Verify that electrical wiring installation is in accordance
with manufacturer's submittal and installation requirements of Division 16
Sections. Do not proceed with equipment start-up until wiring installation is
acceptable.
E.Clean factory finished surfaces. Repair any marred or scratched surfaces with
manufacturer's touch-up paint.
3.6 INSTALLATION OF HYDRONIC SPECIALTIES
A.General: Examine areas and conditions under which hydronic specialties are
to be installed. Do not proceed with work until unsatisfactory conditions have
been corrected in manner acceptable in Installer.
B.Balance Valves: Install balance valve on each hydronic zone circuit, or
discharge of each hydronic pump, and elsewhere as indicated. After hydronic
system balancing has been completed, mark each balance cock with strips of
yellow lacquer across body and stem to permanently mark final balanced
position.
C.Manual Vent Valves: Install manual vent valves on each hydronic terminal at
highest point.
D.Automatic Vent Valves: Install automatic vent valves at top of each hydronic
riser at highest point and elsewhere as indicated. Install petcock between
riser and vent valve.
3.7 DAMPERS
A.Install volume dampers and splitter dampers one gauge heavier than the duct
where shown on drawings for balancing the air flow. Equip all dampers with
accessories as specified herein.
B.Fire dampers shall possess a one hour or two hour standard fire protection
rating as required in accordance with NFPA No. 252, containing inspection
service, and bear UL Label. The dampers shall further meet all requirements
for smoke dampers also.
3.8 FLEXIBLE CONNECTIONS
A.Install flexible materials as specified on the inlet and outlet sheet metal
connections to air moving apparatus, and where indicated on the plans. Clip
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ends with galvanized iron collars. When molded, the complete flexible
connection shall have a minimum width of 5" including 1" slack.
3.9 HANGERS AND SUPPORTS
A.Support drops from overhead main at top and bottom of drop and ends of
horizontal runs and elsewhere as required with split clamps and protecting
saddles anchored to building steel or wall to prevent sway.
B.Duct Support: Galvanized steel angles securely fastened to duct and
suspended from building structural framing.
C.Equipment Supports: All equipment shall be firmly supported on, or
suspended from, the building structure. Steel angles, fasteners, rods, and
vibration eliminator units required to support the equipment without undue
transmission of vibration through the building shall be furnished and installed
by this Contractor.
3.10 WATER AND AIR FLOW BALANCE AND TESTS
A.Introduction
1.The final adjustments and balancing of the air systems and
hydronic (water) systems, and the temperature control system
shall be performed by an independent balancing contractor under
the supervision of the Architect/Engineer. The Balancing
Contractor shall be NEBB certified. All labor and instruments
necessary to complete this work shall be provided by the
balancing contractor. The temperature control manufacturer shall
provide labor and technical assistance as required by the
balancing contractor. The balancing contractor shall also be
responsible for removing a ceiling bar blank as required for return
air to ceiling plenum.
2.Prior to this final adjusting and balancing, the Subcontractor shall
have thoroughly checked and tested all parts of the system for
complete and proper lubrication of all parts and equipment,
proper direction of rotating for equipment,control all piping, and
otherwise see that all systems are mechanically and electrically
complete.
3.Immediately following the completion of the adjusting and
balancing of the systems, final readings shall be taken and
recorded of all electrical loads for motors and heating equipment,
final CFM’s for all systems, fan speeds, fan system total CFM’s
operating static pressures at various points in the system. After
all data is recorded, a final functional test of all systems will be
performed to verify their operation and demonstrate to the owner
the performance and operating procedures for the systems.
B.Water Balance Procedure:
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1.After completion of the installation of the heating, ventilating, and
exhaust systems, and prior to acceptance by the Owner, all systems
and appurtenances applicable to the above systems shall be adjusted
and balanced to deliver the water and air quantities as specified,
indicated on the drawings, or as directed.
2.Balancing shall be performed by an independent contractor affiliated
with a national testing and balancing agency, NEBB, using methods
recommended by the national agency.
3.Pump capacities shall be determined by differential pressure
measurements. Water circuits shall be adjusted by balancing cocks
previously specified. All balancing cocks shall be permanently marked
after balance is complete so that they may be restored to their correct
position if disturbed.
4.Total air quantities both supply and exhaust/return, shall be obtained
by adjustment f fan speeds and outdoor air/return air dampers,
including building static pressure. Branch duct air quantities shall be
adjusted by volume or splitter dampers, and by adjustment of flow
controls on VAV boxes (set maximum and minimum positions).
Dampers shall be permanently marked after air balance is complete so
that they can be restored to their correct position if disturbed at any
time.
C.Air Balance Procedure:
1.General Instructions: The supply and return air fans should be air
balanced with allowances in the fan speeds for dirty filters, damper
sequencing, and building pressurization. The Temperature Control
subcontractor and the Mechanical subcontractor shall work together
during the entire balancing procedure.
2.Balancing Procedures: Start supply and return air fans. Set system
to minimum outside air and if face and bypass dampers are
installed, set to bypass condition. Check fan drive for rotation and
slippage. Measure actual amperes and calculate brake
horsepower using the following formula.
Measured Amps x Nameplate H.P.
BHP = Nameplate Rated amps.
a.The brake horsepower must not exceed the nameplate
rating.
b.Stabilizing the Supply and Return Air Fans: Measure the
suction pressure at a point between the outside air
dampers in their minimum outside air position and the
exhaust dampers closed. All balancing dampers in the
supply and return air systems must be in their maximum
open position. This suction pressure should be
approximately -.4 inches to .5 inches WG. If it is much
higher, look for leaks. Sequence the outside air, return air,
and exhaust air dampers from minimum to maximum
outside air and then back to minimum. This suction
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pressure must be negative to atmosphere and remain fairly
constant during this cycle. With at least 20 degrees F.
temperature differential between outside and return air
temperatures, calculate the design mixed air temperature.
c.Take several readings of the mixed air temperature in
several different places in the fan discharge plenum. These
readings must be taken without preheat or pre-cooling. If
the average mixed air temperature is higher than design,
slow down the return air fan to attain design temperature.
If the average mixed air temperature is lower than design,
check for excessive leakage through the maximum fresh air
dampers, the face dampers, and the mixing plenum; then,
speed up the return air fan. (The brake horsepower must
not exceed the nameplate.)
d.Preliminary Balancing: With all supply and return air
balancing dampers in their maximum open position, take
neck velocity, tip velocity, or any other approved method of
measuring air flow through all supply diffusers and/or
grilles on this fan system and record these air flows. Select
the diffusers and/or grilles with the lowest percent of
design flow on each of the main branch ducts and adjust
the balancing dampers in each of the branch ducts to attain
the same percent of design flow through the lowest percent
diffusers. Now adjust all diffuser balancing dampers to
attain the average percent of design flow of all diffusers on
this fan system. The balancing dampers in the most critical
or lowest percent of design flow diffusers must be in their
maximum open position.
e.If the average percent of design flow is less than design,
speed up both supply and return air fans and repeat step.
f.If the average percent of design flow is above fan design,
slow down both supply and return air fans and repeat step.
g.Start all exhaust fans and calculate brake horsepower for
each
D.Function Checking of the Systems:
1.Any equipment, filter, etc. used for temporary heating must be
delivered after use in clean condition.
2.Allow all fan and exhaust systems to operate until they and their
controls have been thoroughly checked, tested, and where
necessary, readjusted, calibrated, and rebalanced.
3.Record the following readings on each supply and/or exhaust
system.
a.Nameplate amperes.
b.Actual amperes.
c.Nameplate horsepower.
d.Calculate BHP as previously described.
e.Inlet static pressure as previously described.
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f.Fan RPM
E.Air Balancing Procedure for Exhaust Fans:
1.General Instructions: All design air quantities in general are
maximum air volumes and should not be exceeded. Air
measurements through exhaust air grilles should not be made
until all supply fans have been air and temperature balanced. Air
exhaust fan exhaust dampers must be mechanically operated from
the full closure to the full o pen position before starting the
exhaust fan.
2.All main balancing dampers and exhaust air grille dampers must
be in their maximum open position before starting fan.
3.Balancing Procedures: Start exhaust fan. Check fan drive for
rotation and slippage. Measure actual amperes and calculate
brake horsepower using the following formula:
Measured Amps x Nameplate HP
BHP = Nameplate Rated Amps
a.The Brake Horsepower Must Not Exceed the Nameplate
Rating.
b.Preliminary Air Balance: With all main return air dampers in
their maximum open position and all exhaust air grille
dampers wide open, measure either air flow or pressure drop
through each of the grilles on a system. Adjust the main
balancing dampers in each branch to equalize or proportion
the airflow through each branch. Record the airflow or
pressure drop through each grille after the air flow through
each branch has been proportioned. Now balance each grille
to the average percent of design flow. Those grilles with the
lowest percent of design flow must have their balancing
dampers in their maximum open position.
4.Follow steps as outlined in Article 5, paragraph b through d for
the supply air systems.
G.Defective Work: If inspection or tests indicate defects, such defective
work or material shall be replaced or repaired as necessary and
inspection an tests repeated. Repairs to piping shall be made with new
material. No caulking of screwed joints or holes will be acceptable.
3.11 INSULATION
A.All pipe and duct insulation shall be installed by an independent insulation
contractor regularly engaged in that business.
B.Insulation shall not be omitted on piping in walls or on branches running
through radiator covers. Longitudinal seams on jackets shall be located so
that they are not visible from the floor. Remove all stickers from covering.
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C.Insulation shall be applied over clean pipe with all joints butted firmly
together and sealed with butt strips. Insulation shall run through all hangers
and sleeves and have an 18 gauge sheet metal saddle equal to three times
the pipe diameter in length. All pipes over 2" in diameter shall be supported
through insulation by fitting a protection saddle to the thickness of the
insulation inside the vapor barrier jacket.
D.All fittings, valves, etc. shall be insulated with the proper factory pre-cut
insulation. The ends of the insulation shall be tucked snugly into the throat
of the fitting and the edge adjacent to the pipe covering tufted and tucked
into fully insulated pipe fitting. The one piece PVC fitting cover shall then be
secured by taping the ends of the adjacent pipe covering.
3.12 EQUIPMENT INSTALLATION
A.All equipment furnished under this Section shall be installed in accordance
with its manufacturer's printed installation instructions, whether so shown on
the drawings or not, and all labor and materials required to accomplish this
shall be furnished by the HVAC Subcontractor and be included in his bid.
3.13 CLEANING AND FLUSHING
A.All water circulating systems for the project shall be thoroughly cleaned
before placing in operation to rid the system of dirt, piping compound, mill
scale, oil, and any and all other material foreign to the water being circulated.
Clean all strainers.
B.Extreme care shall be exercised during construction to prevent all dirt and
other foreign matter from entering the pipe or other parts of the system.
Pipe stored on the project shall have the open ends capped and equipment
shall have all openings fully protected. Before erection, each piece of pipe,
fitting, or valve shall be visually examined and all dirt removed.
C.After system is complete, the HVAC Subcontractor shall add trisodium
phosphate in an aqueous solution to the system at the proportion of one
pound per fifty gallons of water in the system. After the system is filled with
this solution, the system shall be brought up to temperature and allowed to
circulate for two hours. The system shall then be drained completely and
refilled with fresh water. The Architect shall be given notice of this cleaning
operation and he or his representative shall be present to observe the
cleaning operation, and, if he deems it necessary, the cleaning operation shall
be repeated.
D.After the system has been completely cleaned as specified herein, it shall be
tested by litmus paper or other dependable method and shall be left on the
slightly alkaline side (ph = 7.5 plus or minus). If the system is found to be
still on the acid side, the cleaning by the use of trisodium phosphate shall be
repeated.
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E.The HVAC Subcontractor shall not add any water treatment chemicals, or at
any time "stop-leak" compounds to the system.
3.14 SYSTEM TESTS AND CLEAN-UP
A.The entire HVAC system shall be tested at completion of the building, and it
shall be established that all controls are calibrated accurately and
performing satisfactorily and that all units are HVAC satisfactorily. The
systems shall be checked for vibration and excessive noise and all such
conditions corrected.
B.At the completion of all work, all equipment on the project shall be checked
and thoroughly cleaned including coils, plenums, under equipment and any
and all other areas around or in equipment provided under this Section.
Any filters used during construction shall be replaced with new filters during
final clean-up.
C.At the completion of all work, all equipment on the project shall be checked
for painting damage, and any factory finished paint that has been damaged
shall be repaired to match the adjacent areas.
D.Any metal or especially covered areas that have been deformed shall be
replaced with new material and repainted to match the adjacent areas.
3.15 FIRE SAFING
A.Work Included: Provide labor, materials, and equipment necessary to
complete the work including, but not limited to the following:
1.Fire safing at all penetrations through fire barriers.
2.Fire safing at all penetrations through smoke barriers.
3.Extent of fire and smoke barriers as indicated on the Architectural
Drawings.
4.Fire safing at all penetrations through floors, shafts, corridor walls,
stairway walls, mechanical rooms, electrical rooms, vaults, storage
rooms, kitchen, machine rooms, outdoor storage rooms, and
receiving rooms.
B.Safing Insulation
1.Fire safing insulation shall be Thermafiber as manufactured by USG
Interiors, Inc. or Architect-Engineer approved equal, 4" minimum
thickness by the required full length and width, or as indicated on the
Drawings.
2.Provide incidental galvanized steel clip anchors.
C.Seal Compound: At "poke-through" openings, apply "Firecode" seal
compound as manufactured by USG Interiors, Inc., or approved equal, over
Thermafiber fire safing.
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D.Preparation
1.At all fire rated assemblies, prepare all penetrations for ducts, pipes,
and fire dampers.
E.Application
1.Install approved fire safing insulation of proper size leaving no voids.
Compress and friction fit fire safing and use attachment clips where
necessary.
2.Seal completely around all openings and over the fire safing
insulation with sealing compound.
END OF SECTION