230000MSBA Accelerated Repair Program
RK Finn/Ryan Road and Leeds Elementary Schools
Northampton, Massachusetts
HVAC
23 00 00 - i
SECTION 23 00 00
HVAC
(Filed Sub-Bid Required)
PART 1 - GENERAL ......................................................................................................................................1
1.01 GENERAL PROVISIONS .................................................................................................................1
1.02 RELATED DOCUMENTS .................................................................................................................2
1.03 SUMMARY OF WORK .....................................................................................................................2
1.04 RELATED WORK .............................................................................................................................2
1.05 CODES, ORDINANCES, AND PERMITS ........................................................................................3
1.06 QUALITY ASSURANCE ...................................................................................................................3
1.07 CONTRACT DRAWINGS .................................................................................................................4
1.08 NOTIFICATION OF RELATED TRADES .........................................................................................4
1.09 MECHANICAL INSTALLATIONS .....................................................................................................4
1.10 CUTTING AND PATCHING .............................................................................................................5
1.11 SUBMITTALS ...................................................................................................................................5
1.12 SUBSTITUTIONS .............................................................................................................................5
1.13 PRODUCT LISTING .........................................................................................................................6
1.14 DELIVERY, STORAGE AND HANDLING ........................................................................................6
1.15 WARRANTIES ..................................................................................................................................6
1.16 SELECTIVE REMOVAL OF HVAC EQUIPMENT ............................................................................6
PART 2 - PRODUCTS ...................................................................................................................................7
2.01 EXISTING EQUIPMENT ..................................................................................................................7
2.02 POWER AND GRAVITY VENTILATORS ........................................................................................7
2.03 ELECTRICAL REQUIREMENTS FOR MECHANICAL EQUIPMENT .............................................8
2.04 METAL DUCTWORK .................................................................................................................... 10
2.05 DUCTWORK ACCESSORIES ...................................................................................................... 11
2.06 ROOF LOUVERED GRAVITY RELIEF HOODS ........................................................................... 13
2.07 REFRIGERANT PIPING AND ACCESSORIES ............................................................................ 14
2.08 AUTOMATIC TEMPERATURE CONTROLS (DDC) ..................................................................... 16
PART 3 - EXECUTION ............................................................................................................................... 16
3.01 INSTALLATION OF EXISTING EQUIPMENT ............................................................................... 16
3.02 INSTALLATION OF POWER AND GRAVITY VENTILATORS ..................................................... 16
3.03 INSTALLATION OF METAL DUCTWORK .................................................................................... 17
3.04 INSTALLATION OF DUCTWORK ACCESSORIES ...................................................................... 18
3.05 INSTALLATION OF ROOF GRAVITY RELIEF HOODS ............................................................... 19
3.06 INSTALLATION OF REFRIGERANT PIPING & ACCESSORIES ................................................ 19
3.07 INSTALLATION OF AUTOMATIC TEMPERATURE CONTROLS (DDC): ................................... 19
END OF INDEX
MSBA Accelerated Repair Program
RK Finn/Ryan Road and Leeds Elementary Schools
Northampton, Massachusetts
HVAC
23 00 00 - 1
SECTION 23 00 00
HVAC
(Filed Sub-Bid Required)
PART 1 - GENERAL
1.01 GENERAL PROVISIONS
A. Attention is directed to the CONTRACT AND GENERAL CONDITIONS and all Sections
within DIVISION 01 - GENERAL REQUIREMENTS which are hereby made a part of
this Section of the Specifications.
B. Time, Manner and Requirements for Submitting Sub-Bids:
1. Sub-bids for work under this Section shall be for the complete work and shall be
filed in a sealed envelope with the ________________________ at a time and
place as stipulated in the "NOTICE TO CONTRACTORS".
The following should appear on the upper left hand corner of the envelope:
NAME OF SUB-BIDDER: (Insert name of sub-bidder)
PROJECT: ((Insert project number from top of
page))
SUB-BID FOR SECTION: 23 00 00 – HVAC
2. Each sub-bid submitted for work under this Section shall be on forms furnished
by the ________________ as required by Section 44F of Chapter 149 of the
General Laws, as amended. Sub-bid forms may be obtained at the office of the
________________, or may be obtained by written or telephone request;
telephone _____________.
3. Sub-bids filed with the _____________________ shall be accompanied by BID
BOND or CASH or CERTIFIED CHECK or TREASURER'S CHECK or
CASHIER'S CHECK issued by a responsible bank or trust company payable to
the ____________________ in the amount of five percent of the sub-bid. A sub-
bid accompanied by any other form of bid deposit than those specified will be
rejected.
C. Sub Sub-Bid Requirements:
Class of Work: Reference Section
Sheetmetal & Accessories 2.04, 2.05, 2.03, 3.04
D. Reference Drawings: The Work of this Filed Sub-Bid is shown on the following
Contract Drawings: M1.0(Leeds Elementary Schools), M2.0(Leeds Elementary
Schools), M2.1(Leeds Elementary Schools), M2.2(Leeds Elementary Schools), M1.0 (K
Finn/Ryan Road), M2.0 K Finn/Ryan Road), M2.1 K Finn/Ryan Road), M2.2 K
Finn/Ryan Road)
MSBA Accelerated Repair Program
RK Finn/Ryan Road and Leeds Elementary Schools
Northampton, Massachusetts
HVAC
23 00 00 - 2
1.02 RELATED DOCUMENTS
A. Drawings and general provisions of the Contract, including General and Supplementary
Conditions and Division 1 Specification Sections, apply to this Section.
B. Examine all Drawings and all Sections of the Specifications for requirements and
provisions affecting the work of this Section.
1.03 SUMMARY OF WORK
A. The work described herein shall be interpreted as work to be done by the HVAC
Subcontractor. Work to be performed by other trades will always be specifically
referenced to that trade.
B. This Contractor to raise equipment from existing curbs for flashing purposes.
Disconnect and reconnect all ductwork, power wiring, ATC wiring, refrigerant piping, hot
water piping, and insulation associated with ductwork and piping. This contractor will
also be removing when no longer needed, all temporary lifts, hoists, staging,
scaffolding, rigging, labor and materials, and temporary support to perform all
operations in connection and disconnection of this work.
C. Without limiting the generality thereof, the work to be performed under this Section
includes:
1. Lifting existing HVAC equipment and appurtenances from the roof to
accommodate the roof replacement project.
2. Providing roof curb extensions as required to accommodate desired mounting
heights of equipment in original locations upon completion of roof replacement
project.
3. Providing necessary extensions to HVAC equipment and appurtenances to
reconnect original equipment to existing HVAC systems in the building.
4. Reinstallation of original equipment in original locations upon completion of
installation of new roof.
5. Providing original equipment in original locations for complete and operable
HVAC systems.
D. Furnish all labor and material associated with sealing and fire safing of mechanical
systems.
1.04 RELATED WORK
A. Cutting beyond the requirements as stated herein, and patching of all openings
regardless of size, is specified in the respective Sections of the trade responsible for
furnishing and installing similar new materials.
B. For power wiring of mechanical equipment refer to Section 260000 - ELECTRICAL.
MSBA Accelerated Repair Program
RK Finn/Ryan Road and Leeds Elementary Schools
Northampton, Massachusetts
HVAC
23 00 00 - 3
1.05 CODES, ORDINANCES, AND PERMITS
A. Perform all work in accordance with the requirements of the City of Northampton
Building Department, State of Massachusetts Building Code, and applicable State and
Federal Laws. Give all requisite notices, file all requisite plans, and obtain all permits
required to perform HVAC Work. Pay all fees and include in the Bid.
1.06 QUALITY ASSURANCE
A. Codes and Standards:
1. ANSI Standards: Comply with ANSI A13.1 for pipe, valve, and equipment
identification.
2. FM Compliance: Provide control devices and control sequences in accordance
with requirements of Factory Mutual System (FM).
3. IRI Compliance: Provided control devices and control sequences in accordance
with requirements of Industrial Risk Insurance (IRI).
4. AGA Compliance: Provide gas controls and devices in accordance with
American Gas Associates.
5. UL and NEMA Compliance: Provide electrical components required as part of air
handling units, which have been listed and labeled by UL and comply with NEMA
standards.
6. NEC Compliance: Comply with National Electrical Code (NFPA 70) as
applicable to installation and electrical connections of ancillary electrical
components of air handling units.
B. MSS Standard Practices: Comply with the following standards for valves:
1. MSS SP-45: Bypass and Drain Connection Standard
2. MSS SP-67: Butterfly Valves
3. MSS SP-70: Cast Iron Gate Valves, Flanged and Threaded Ends
4. MSS SP-71: Cast Iron Swing Check Valves, Flanged
5. MSS SP-72: Ball Valves with Flanged or Butt-Welding Ends for General Service
6. MSS SP-78: Cast Iron Plug Valves, Flanged and Threaded Ends
7. MSS SP-80: Bronze Gate, Glove Angle and Check Valves
8. MSS SP-84: Steel Valves - Socket Welding and Threaded Ends
9. MSS SP-85: Cast Iron Globe and Angle Valves, Flanged with Threaded Ends
10. MSS SP-92: MSS Valve User Guide
C. Automatic Temperature Control Contractor Qualifications: Firms specializing in
manufacturing and installation of control system for not less than 5 years.
1. Codes and Standards:
a. Electrical Standards: Provide electrical components of control systems
which have been UL-listed and labeled, and comply with NEMA standards.
b. NEMA Compliance: Comply with NEMA standards pertaining to
components and devices for pneumatic control systems.
c. NFPA Compliance: Comply with NFPA 90A "Standard for the Installation
of Air Conditioning and Ventilating Systems" where applicable to controls
and control sequences.
MSBA Accelerated Repair Program
RK Finn/Ryan Road and Leeds Elementary Schools
Northampton, Massachusetts
HVAC
23 00 00 - 4
1.07 CONTRACT DRAWINGS
A. All work shown on the Drawings is intended to be approximately correct to scale, but
shall be taken in a sense as diagrammatic. Sizes of pipes and general method of
running them are shown, but it is not intended to show every offset and fitting. To carry
out the true intent and purpose of the plans, furnish all necessary parts to make
complete working systems ready for use.
B. The HVAC Drawings and Specifications are intended to supplement each other so that
any details shown on the Drawings and not mentioned in the Specifications, or vice-
versa, shall be executed the same as if mentioned in the Specifications and shown on
the Drawings.
C. Refer to the Architectural, Structural, and other Mechanical and Electrical Drawings
which indicate the construction in which this work shall be installed. Locations shown
on the plans shall be checked against the general and detailed Drawings of the
construction proper. All measurements must be taken at the building.
1.08 NOTIFICATION OF RELATED TRADES
A. Notify all other trades responsible for installing chases, inserts, sleeves, anchors, and
louvers. when ready for such installation and for final checking. Cooperate with such
trades to obtain proper installation.
B. Leave openings in roof for mechanical and electrical work as shown on Drawings or
required by layout of mechanical or electrical systems.
1.09 MECHANICAL INSTALLATIONS
A. Coordinate mechanical equipment and materials installation with other building
components.
B. Verify all dimensions by field measurements.
C. Arrange for chases, slots, and openings in other building components to allow for
mechanical installations.
D. Sequence, coordinate, and integrate installations of mechanical materials and
equipment for efficient flow of the work. Give particular attention to large equipment
requiring positioning prior to closing-in the building.
E. Coordinate the cutting and patching of building components to accommodate the
installation of mechanical equipment and materials.
F. Where mounting heights are not detailed or dimensioned, install mechanical services
and overhead equipment to provide the maximum headroom possible.
G. Install mechanical equipment to facilitate maintenance and repair or replacement of
equipment components. As much as practical, connect equipment for ease of
disconnecting, with minimum of interference with other installations.
H. Coordinate connection of mechanical system with utilities and services. Comply with
requirements of governing regulations, franchised service companies, and controlling
agencies. Provide required connection for each service.
MSBA Accelerated Repair Program
RK Finn/Ryan Road and Leeds Elementary Schools
Northampton, Massachusetts
HVAC
23 00 00 - 5
1.10 CUTTING AND PATCHING
A. Drilling, coring, and cutting of new and existing structures (through walls, floors, ceiling,
etc.) where the largest dimension does not exceed 12 in. shall be by this Contractor.
B. Throughout the performance of the cutting and coring work, ensure that the structural
integrity of the existing walls, floors, overhead structure, and other structural
components, which are to remain, is maintained until permanent work is installed. Prior
to any coring or cutting verify all locations of same with the General Contractor. All
cutting and coring is to be performed in accordance with approved coordination
drawings.
C. No additional compensation will be authorized for cutting and patching work that is
necessitated by ill-timed, defective, or non-conforming installations.
1.11 SUBMITTALS
A. Refer to Division 01 – GENERAL REQUIREMENTS for submittal definitions,
requirements, and procedures. The following paragraphs supplement the requirements
of Division 01.
B. Submittal of Shop Drawings, product data, and samples will be accepted only when
submitted by the General Contractor. Data submitted by Sub-contractors and material
suppliers directly to the Architect/Engineer will not be processed.
C. Provide submittals for the following equipment:
1. Metal Ductwork
2. Ductwork Accessories
3. Exhaust Fans
D. If a Shop Drawing is not accepted after two submissions, a third submission from the
same manufacturer will not be considered.
E. Check Shop Drawings and other submittals to assure compliance with contract
documents before submittal to A/E.
F. Review of Shop Drawings is final and no further changes shall be considered without
written application. Shop Drawings review does not apply to quantities, nor relieve this
Contractor of his responsibility for furnishing materials or performing his work in full
compliance with these Contract Drawings and Specifications. Review of these shop
drawings shall not be considered a guarantee of the measurements of this building or
the conditions encountered.
1.12 SUBSTITUTIONS
A. If materials or equipment are substituted for specified items that alter the systems
shown or its physical characteristics, or which have different operating characteristics,
clearly note the alterations or difference and call it to the attention of the a/e. Under no
circumstances shall substitutions be made unless material or equipment has been
successfully operated for at least three consecutive years.
MSBA Accelerated Repair Program
RK Finn/Ryan Road and Leeds Elementary Schools
Northampton, Massachusetts
HVAC
23 00 00 - 6
B. Any modifications to the design, as a result of approving a substitution, shall be the
responsibility of this contractor. Any additional cost to this contractor or any other
contractor, directly or indirectly, as a result of such substitutions, shall be the
responsibility of this contractor.
1.13 PRODUCT LISTING
A. Prepare listing of major mechanical equipment and materials for the project.
B. Provide all necessary information.
C. Submit to the A/E through the General Contractor, within twenty days of signing
contract, this listing indicating all equipment and manufacturers, as a part of the
submittal requirement.
D. When two or more items of same material or equipment are required they shall be of
the same manufacturer. Product manufacturer uniformity does not apply to raw
materials, bulk materials, pipe, tube, fittings (except flanged and grooved types), sheet
metal, wire, steel bar stock, welding rods, solder, fasteners, motors for dissimilar
equipment units, and similar items used in work, except as otherwise indicated.
E. Provide products which are compatible within systems and other connected items.
1.14 DELIVERY, STORAGE AND HANDLING
A. Refer to Section General Conditions for delivery, storage, and handling of equipment.
The following paragraphs supplement the requirements of Section General Conditions.
B. Deliver products to project properly identified with names, model numbers, types,
grades, compliance labels, and similar information needed for distinct identifications;
adequately packaged and protected to prevent damage during shipment, storage, and
handling.
C. Store equipment and materials at the site, unless off-site storage is authorized in
writing. Protect stored equipment and materials from damage.
D. Coordinate deliveries of mechanical materials and equipment to minimize construction
site congestion. Limit each shipment of materials and equipment to the items and
quantities needed for the smooth and efficient flow of installations.
1.15 WARRANTIES
A. Refer to General Conditions for procedures and submittal requirements for warranties.
1.16 SELECTIVE REMOVAL OF HVAC EQUIPMENT
A. Existing HVAC equipment located on the roof shall be disconnected from existing
HVAC system, stored and reinstalled in the same approximate location upon
completion of the roof replacement project.
B. All HVAC equipment being removed from the roof to accommodate the roof
replacement shall be properly tagged by the Contractor prior to removal to ensure
original equipment is installed in the original location of equipment and properly re-
connected to existing HVAC systems, to be reused.
MSBA Accelerated Repair Program
RK Finn/Ryan Road and Leeds Elementary Schools
Northampton, Massachusetts
HVAC
23 00 00 - 7
C. Upon completion of the roof replacement project, original equipment shall be
reconnected to existing associated HVAC systems and equipment shall be returned to
original working order as it was prior to the roof replacement project.
PART 2 - PRODUCTS
2.01 EXISTING EQUIPMENT
A. All existing equipment is intended to be reused. If original equipment is deemed not fit
for reuse, the HVAC Contractor shall notify the Architect, Owner, and/or Engineer
immediately for direction to proceed.
B. All existing equipment indicated on the roof plan shall be removed for the roofing repair
project. Upon completion of the roofing repair project the equipment shall be
reconnected in its original locations as indicated on the roof.
C. Equipment shall be reconnected to existing controls and operate in the same manner it
operated prior to the roof replacement project.
2.02 POWER AND GRAVITY VENTILATORS
A. General: Except as otherwise indicated, provide standard prefabricated power and
gravity ventilator units of type and size indicated, modified as necessary to comply with
requirements, and as required for complete installation.
B. Refer to Division 23 HVAC for control sequence.
C. Roof Fans (EF):
1. Type: Centrifugal fan, direct or belt driven as scheduled. Provide aluminum, or
galvanized steel, weatherproof housings as scheduled. Provide square base to
suit roof curb. Provide permanent split-capacitor type motor for direct driven
fans; capacitor-start, induction-run type motor for belt driven fans.
2. Electrical: Provide factory-wired non-fusible type disconnect switch at motor in
fan housing. Provide thermal overload protection in fan motor. Provide conduit
chase within unit for electrical connection.
3. Bird Screens: Provide removable bird screens, 1/2 in. mesh, 16-ga. aluminum or
brass wire.
4. Gravity Operated Dampers: Provide gravity-actuated, felt edge, louvered
dampers in curb bases.
5. Motor Operated Dampers: Provide louvered dampers with linkage below curb
base (maximum of 6 in.).
6. Provide hinged curb access with restraint cable for service.
7. Manufacturer: Subject to compliance with requirements, provide centrifugal roof
ventilators of one of the following:
a. Cook Co., Loren.
b. Greenheck Fan Corp.
c. Twin City
d. Or equal
D. Roof Hoods (RH):
1. Type: Stationary, natural draft type. Provide weatherproof housings to match
power ventilators in materials and finish. Provide square or rectangular base to
suit roof curb.
MSBA Accelerated Repair Program
RK Finn/Ryan Road and Leeds Elementary Schools
Northampton, Massachusetts
HVAC
23 00 00 - 8
2. Bird Screens: Provide removable bird screens, 1/2 in. mesh, 16-ga aluminum or
brass wire.
3. Gravity Operated Dampers: Provide gravity actuated louvered dampers in curb
bases on relief hoods only.
4. Motor Operated Dampers: Provide low voltage electronic dampers on intake
hoods with linkage below curb base (maximum of 6 in.). Refer to Division-15
Automatic Temperature Control section for control sequence.
5. Manufacturer: Subject to compliance with requirements, provide gravity
ventilators of the following:
a. Cook Co., Loren.
b. Greenheck Fan Corp.
c. Twin City
d. Or equal
E. Prefabricated Roof Curbs:
1. Manufacturer of ventilating unit shall provide his standard roof curb compatible
with unit being provided. Curb shall be insulated and sloped to allow for
level installation of device. Provide all necessary nailers, canted curbs, etc. for
a complete installation.
2.03 ELECTRICAL REQUIREMENTS FOR MECHANICAL EQUIPMENT
A. Pursuant to Massachusetts General Laws Chapter 141, a Massachusetts Licensed
electrician shall install all low and line voltage wiring required by this section.
B. General: The following are basic requirements for simple or common motors. For
special motors, more detailed and specific requirements are specified in the individual
equipment specifications.
1. All motors for all mechanical equipment shall be premium efficiency matching the
following:
HP RPM Efficiency
a. 1 1800 85.5%
b. 1.5 1800 86.5%
c. 2 1800 86.5%
d. 3 1800 89.5%
e. 5 1800 89.5%
f. 7.5 1800 91.0%
g. 10 1800 91.7%
h. 15 1800 93.0%
i. 20 1800 93.0%
j. 25 1800 93.6%
k. 30 1800 94.1%
l. 40 1800 94.1%
m. 50 1800 94.5%
2. Torque characteristics shall be sufficient to satisfactorily accelerate the driven
loads.
3. Motor sizes shall be large enough so that the driven load will not require the
motor to operate in the service factor range.
4. 2-speed motors shall have 2 separate windings on poly-phase motors.
5. Temperature Rating: Rated for 40° C. environment with maximum 50° C
temperature rise for continuous duty at full load (Class A Insulation).
MSBA Accelerated Repair Program
RK Finn/Ryan Road and Leeds Elementary Schools
Northampton, Massachusetts
HVAC
23 00 00 - 9
6. Starting Capability: Frequency of starts as indicated by automatic control
system, and not less than 5 evenly time spaced starts per hour for manually
controlled motors.
7. Service Factor: 1.15 for poly-phase motors and 1.35 for single phase motors.
8. Motor Construction: NEMA Standard MG 1, general purpose, continuous duty,
Design "B", except "C" where required for high starting torque.
9. Frames: NEMA Standard No. 48 or 54; use driven equipment manufacturer's
standards to suit specific application.
10. Bearings:
a. Ball or roller bearings with inner and outer shaft seals.
b. Re-greasable, except permanently sealed where motor is normally
inaccessible for regular maintenance.
c. Designed to resist thrust loading where belt drivers or other drives produce
lateral or axial thrust in motor.
d. For fractional horsepower, light duty motors, sleeve type bearings are
permitted.
11. Enclosure Type:
a. Open drip-proof motors for indoor use where satisfactorily housed or
remotely located during operation.
b. Guarded drip-proof motors where exposed to contact by employees or
building occupants.
c. Weather protected Type I for outdoor use, Type II where not housed.
12. Overload Protection: Built-in thermal overload protection and, where indicated,
internal sensing device suitable for signaling and stopping motor at starter.
13. Noise Rating: "Quiet".
14. Efficiency: "Energy Efficient" motors shall have a minimum efficiency as
scheduled in accordance with IEEE Standard 112, test method B. If efficiency
not specified, motors shall have a higher efficiency than "average standard
industry motors", in accordance with IEEE Standard 112, Test Method B.
15. Nameplate: Indicate the full identification of manufacturer, ratings,
characteristics, construction, special features and similar information.
C. Starters, Electrical Devices, and Wiring: (Provided By The HVAC Contractor for Each
Packaged Piece Of HVAC Equipment Requiring Such):
1. Motor Starter Characteristics:
a. Enclosures: NEMA 1, general purpose enclosures with padlock ears,
except in wet locations shall be NEMA 3R with conduit hubs, or units in
hazardous locations which shall have NEC proper class and division.
b. Type and size of starter shall be as recommended by motor manufacturer
and the driven equipment manufacturer for applicable protection and start-
up condition.
2. Magnetic Starters:
a. Maintained contact push buttons and pilot lights, properly arranged for
single speed or multi-speed operation as indicated.
b. -free thermal overload relays, each phase.
c. Interlocks, switches and similar devices as required for co-ordination with
control requirements of Division 15 Controls Sections.
d. Built-in 120 volts control circuit transformer, fused from line side, where
service exceeds 240 volts.
e. Externally operated manual reset.
f. Under-voltage release or protection.
3. Capacitors:
a. Individual unit cells.
b. All welded steel housing.
c. Each capacitor internally fused.
MSBA Accelerated Repair Program
RK Finn/Ryan Road and Leeds Elementary Schools
Northampton, Massachusetts
HVAC
23 00 00 - 10
d. Non-flammable synthetic liquid impregnant.
e. Craft tissue insulation.
f. Aluminum foil electrodes.
g. KVAR size shall be as required to correct motor power factor to 90 percent
or better and shall be installed on all motors 1 horsepower and larger, that
have an uncorrected power factor of less than 85 percent at rated load.
4. Disconnect Switches (Those specified under this Section):
a. Fusible Switches: Fused, each phase; general duty; horsepower rated;
non-teasible quick-make, quick-break mechanism; dead front line side
shield; solderless lugs suitable for copper or aluminum conductors; spring
reinforced fuse clips; electro silver plated current carrying parts; hinged
doors; operating lever arranged for locking in the "OPEN" position; arc
quenchers; capacity and characteristics as indicated.
b. Non-fusible Switches: For equipment 2 horsepower and smaller, shall be
horsepower rated; toggle switch type; quantity of poles and voltage rating
as indicated. For equipment larger than 2 horsepower, switches shall be
the same as fusible type.
2.04 METAL DUCTWORK
A. Ductwork Materials:
1. Exposed Ductwork Materials: Where ductwork is indicated to be exposed to view
in occupied spaces, provide materials which are free from visual imperfections
including piping, seam marks, roller marks, stains and discolorations, and other
imperfections, including those which would impair painting.
2. Sheet Metal: Except as otherwise indicated, fabricate ductwork from galvanized
sheet steel complying with ASTM A 527, lock forming quality, with G 90 zinc
coating in accordance with ASTM A 525; and mill phosphatized for exposed
locations.
B. Miscellaneous Ductwork Materials:
1. General: Provide miscellaneous materials and products of types and sizes
indicated and, where not otherwise indicated, provide type and size required to
comply with ductwork system requirements including proper connection of
ductwork and equipment.
2. Fittings: Provide radius type fittings fabricated of multiple sections with maximum
15 degree change of direction per section. Unless specifically detailed
otherwise, use 45 degree laterals and 45 degree elbows for branch takeoff
connections. Where 90 degree branches are indicated, provide conical type
tees.
3. Duct Sealant: Non-hardening, non-migrating mastic or liquid elastic sealant, type
applicable for fabrication/installation details, as compounded and recommended
by manufacturer specifically for sealing joints and seams in ductwork.
4. Ductwork Support Materials: Except as otherwise indicated, provide hot-dipped
galvanized steel fasteners, anchors, rods, straps, trim and angles for support of
ductwork.
a. For exposed stainless steel ductwork, provide matching stainless steel
support materials.
b. For aluminum ductwork, provide aluminum support materials except where
materials are electrically separated from ductwork.
5. Flexible Ducts: Corrugated aluminum complying with UL 181.
a. Where installed in unconditioned spaces other than return air plenums,
provide 1 in. thick continuous flexible fiberglass sheath with vinyl vapor
barrier jacket.
MSBA Accelerated Repair Program
RK Finn/Ryan Road and Leeds Elementary Schools
Northampton, Massachusetts
HVAC
23 00 00 - 11
C. Fabrication:
1. Shop fabricated ductwork in 4, 8, 10 or 12-ft lengths, unless otherwise indicated
or required to complete runs. Preassembled work in shop to greatest extent
possible, so as to minimize field assembly of systems. Disassemble systems
only to extent necessary for shipping and handling. Match-mark sections for
reassembly and coordinated installation.
2. Shop fabricated ductwork of gages and reinforcement complying with SMACNA
"HVAC Duct Construction Standards".
3. Fabricate duct fittings to match adjoining ducts, and to comply with duct
requirements as applicable to fittings. Except as otherwise indicated, fabricate
elbows with center-line radius equal to 1-1/2 times associated duct width; or
squared metered elbows with double thickness turning vanes. Limit angular
tapers to 30 degrees for contracting tapers and 20 degrees for expanding tapers.
4. Fabricate ductwork with accessories installed during fabrication to the greatest
extent possible. Refer to section "Ductwork Accessories" for accessory
requirements.
5. Fabricate ductwork with duct liner in each section of duct where indicated.
Laminate liner to internal surfaces of duct in accordance with instructions by
manufacturers of lining and adhesive, and fasten with mechanical fasteners.
D. Factory-Fabricated Low Pressure Round and Oval Ductwork:
1. General: Provide factory-fabricated duct and fittings.
2. Material: Material type shall be as indicated or, galvanized sheet steel complying
with ASTM A 527, lock forming quality, with ASTM A 525, G90 zinc coating, mill
phosphatized.
3. Gage: 28-gage minimum for round and oval ducts and fittings, 4 in. through 24
in. diameter.
4. Seams: All seams shall be spiral lockseams.
5. Elbows: One piece construction for 90 degrees and 45 degree elbows 14 in. and
smaller. Provide multiple gore construction for larger diameters with standing
seam circumferential joint.
6. Divided flow Fittings: 90 degree tees, constructed with saddle tap spot welded
and bonded to duct fitting body.
7. Manufacturers: Subject to compliance with requirements, provide factory-
fabricated ductwork of one of the following:
a. Semco Mfg., Inc.
b. United Sheet Metal Div. United McGill Corp.
c. Or equal
2.05 DUCTWORK ACCESSORIES
A. Dampers:
1. Low Pressure Manual Dampers: Provide dampers of single blade type or
multiblade type, constructed in accordance with SMACNA "HVAC Duct
construction Standards".
2. Automatic Control Dampers: Refer to Division-15 section "Automatic
Temperature Control" for control dampers; not work of this section.
3. Backdraft Relief Dampers: Provide dampers with parallel blades,
counterbalanced and factory-set to relieve at .05 in. static pressure. Construct
blades of 16-ga. aluminum, provide 1/2 in. diameter ball bearings, 1/2 in.
diameter steel axles spaced on 9 in. centers. Construct from 2 in. x 1/2 in. x 1/8
in. steel channel for face areas 25 sq. ft. and under: 4 in. x 1-1/4 in. x 16 ga.
channel for face areas over 25 sq. ft. Provide galvanized steel finish on frame
with aluminum touch-up. Provide felted or rubber trim to assure tight, leak-proof
seal when closed.
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4. Manufacturer: Subject to compliance with requirements, provide dampers of one
of the following:
a. Air Balance, Inc.
b. Airguarde Corp.
c. American Warming & Ventilating, Inc.
d. Arrow Louver and Damper; Div. of Arrow United Industries, Inc.
e. Louvers & Dampers, Inc.
f. Penn Ventilator Co.
g. Ruskin Mfg. Co.
h. Or equal
B. Fire Dampers:
1. Fire Dampers: Provide fire dampers, of types and sizes indicated. Construct
casings of 11-ga. galvanized steel. Provide fusible link rated at 160 to 165
degrees F (71 to 74 degrees C) unless otherwise indicated. Provide out of air
stream type damper in open position and with positive lock in closed position,
and with the following additional features:
a. Damper Blade Assembly: Curtain type.
b. Blade Material: Steel, match casing.
c. Blade Material: Stainless steel.
2. Manufacturer: Subject to compliance with requirements, provide fire dampers of
one of the following:
a. Air Balance, Inc.
b. American Warming & Ventilating, Inc.
c. Arrow Louver and Damper; Div. of Arrow United industries, Inc.
d. Louvers & Dampers, Inc.
e. Penn Ventilator Co.
f. Phillips-Aires
g. Ruskin Mfg. Co.
h. Or equal
C. Turning Vanes:
1. Manufactured Turning Vanes: Provide double thickness airfoil turning vanes
constructed of 1-1/2 in. wide curved blades set at 3/4 in. o.c., supported with bars
perpendicular to blades set at 2 in. o.c, and set into side strips suitable for
mounting in ductwork.
2. Manufacturer: Subject to compliance with requirements, provide turning banes of
one of the following:
a. Aero Dyne Co.
b. Airsan Corp.
c. Anemostat Products Div.; Dynamics Corp. of America.
d. Barber-Colman Co.
e. Duro Dyne Corp.
f. Environmental Elements Corp.; Subs, Koppers Co., Inc.
g. Hart & Cooley Mfg. Co.
h. Register & Grille Mfg. Co., Inc.
i. Souther, Inc.
j. Or equal
D. Duct Hardware:
1. General: Provide duct hardware, manufactured by one manufacturer for all items
on project, for the following:
a. Test Holes: Provide in ductwork at fan inlet and outlet, and elsewhere as
indicated, duct test holes, consisting of slot and cover, for instrument tests.
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b. Quandrant Locks: Provide for each damper, quadrant lock device on one
end of shaft; and end bearing plate on other end for damper lengths over
12 in.. Provide extended quadrant locks and end extended bearing plates
for externally insulated ductwork.
2. Manufacturer: Subject to compliance with requirements. Provide duct hardware
of one of the following:
a. Ventbabrics, Inc.
b. Young Regulator Co.
c. Or equal
E. Duct Access Doors:
1. General: Provide duct access doors of a size as required to service and maintain
device in duct. Provide one access door at each control damper, humidifier, coil,
fire damper, and any device that requires attention.
2. Construction: Construct of same or greater gage as ductwork served, provide
insulted doors for insulated ductwork. Provide flush frames for uninsulated
ductwork, extended frames for externally insulated duct. Provide one side
hinged, other side with one handle-type latch for doors 12 in. high and smaller, 2
handle-type latches for larger doors.
3. Manufacturer: Subject to compliance with requirements, provide duct access
doors of one of the following:
a. Air Balance, Inc.
b. Duro Dyne Corp.
c. Register & Grille Mfg. Co., Inc.
d. Ruskin Mfg. Co.
e. Ventfabrics, Inc.
f. Zurn Industries, Inc.; Air Systems Div.
g. Or equal
F. Flexible Connectors:
1. General: Provide flexible duct connections wherever ductwork connects to
vibration isolated equipment. Construct flexible connections of neoprene-coated
flameproof fabric crimped into duct flanges for attachment to duct and equipment.
Make airtight joint. Provide adequate joint flexibility to allow for thermal, axial,
transverse, and torsional movement, and also capable of absorbing vibration of
connected equipment.
2. Manufacturer: Subject to compliance with requirements, provide flexible
connections of one of the following:
a. American/Elgen Co.; Energy Div.
b. Duro Dyne Corp.
c. Flexaust (The) Co.
d. Ventfabrics, Inc.
e. Or equal
2.06 ROOF LOUVERED GRAVITY RELIEF HOODS
A. Louvered penthouse unit for relief applications. Units feature a stormproof aluminum
louver with mitered corners. The clean horizontal lines blend well with modern
architecture. The louver design affords lower pressure drops while maintaining hood
heights. The all-aluminum construction assures lasting durability and appearance. The
removable cover is lined with fiberglass to prevent condensation.
B. Louvers are mounted 4 in. form the roof opening for added weather protection. Options
include bird screens, dampers, roof curbs and special finishes.
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C. Each unit is factory made into four side sections and one cover. Covers for larger units
may require two or more pieces. A factory assembled side consists of the curb cap,
vertical supports, and the quantity of louvers required for the specified height. The
sides are joined at the four corners by sheet metal screws in each louver. These
fasteners are countersunk so as not to disturb the attractive appearance of the mitered
corner. The cover is securely fastened to the unit by stainless steel sheet metal
screws.
D. The interior vertical edge of the curb cap forms the throat and weather shield. Each
corner is also shielded to prevent leakage. Additional vertical supports are provided for
added strength whenever a side section exceeds 44 in. in throat length.
E. Sizes of Gravity relief hoods shall be verified in the field to fit existing penetration and
ductwork.
F. Acceptable Manufacturers:
1. Greenheck
2. Ruskin
3. Wonder Metal
4. Or Equal
2.07 REFRIGERANT PIPING AND ACCESSORIES
A. General: Provide piping materials and factory-fabricated piping products of sizes,
types, pressure ratings, temperature ratings, and capacities as indicated. Where not
indicated, provide proper selection as determined by Installer to comply with installation
requirements.
Provide materials and products complying with ANSI B31.5 Code for refrigeration piping
where applicable; base pressure rating on refrigerant piping system maximum design
pressures. Provide sizes and types matching piping and equipment connections;
provide fittings of materials which match pipe materials used in refrigerant piping
systems. Where more than one type of materials and products are indicated, selection
is Installer’s option.
B. Material: Provide pipes and pipe fittings in accordance with the following listing:
1. Tube Size four-1/8 in. and Smaller: Copper tube; Type ACR, hard-drawn temper;
wrought-copper, solder-joint fittings; brazed joints.
C. Soldered Joints: Solder joints using silver-lead solder, ASTM B32, Grade 96 TS.
D. Brazed Joints: Braze joints using American Welding Society (AWS) classification
BCUO-4 for brazing filler metal.
E. Piping Specialties: Provide piping specialties complying with Division-23 “Hydronic
Piping” in accordance with the following listing:
1. Pipe escutcheons.
2. Drip pans.
3. Sleeves.
4. Sleeve seals.
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F. Refrigerant Valves and Accessories: Special valves required for refrigerant piping
include the following types.
1. Globe Shutoff Valves: Forged brass, packed, back seating, winged seal cap,
300 deg. F (149 degrees C) temperature rating, 500 psi working pressure.
Provide shut-off valves at all terminal units and equipment for services.
2. Check Valves: Forged brass, accessible internal parts, soft synthetic seat, fully
guided piston and stainless steel spring, 250 deg. F (121 deg. C) temperature
rating, 500 psi working pressure.
3. Manufacturer: Subject to compliance with requirements, provide globe and
check valves of one of the following:
a. Henry Valve CO.
b. Parker Hannifin Corp.; Refrigeration and Air Cond. Div.
c. Sporlan Valve Co.
d. Or equal
4. Two-Way Solenoid Valves: Forged brass, designed to conform to ARI 760,
normally closed, teflon valve seat, NEMA 1 solenoid enclosure, 24 volt, 60 Hz.,
UL-listed, ½ in. conduit adapter, 250 deg. F (121 degrees C) temperature rating,
400 psi working pressure.
5. Manufacturer: Subject to compliance with requirements, provide solenoid valves
of one of the following:
a. Alco Controls Div.; Emerson Electric Co.
b. Automatic Switch Co.
c. Sporland Valve CO.
d. Or equal
6. Refrigerant Strainers: Brass shell and end connections, brazed joints, monel
screen, 100 mesh, UL-listed, 350 psi working pressure.
7. Moisture-Liquid Indicators: Forged brass, single port, removable cap, polished
optical glass, solder connections, UL-listed, 200 deg.F (93 deg. C) temperature
rating, 500 psi working pressure.
8. Refrigerant Filter-Driers: Steel shell, ceramic fired desiccant core, solder
connections, UL-listed, 500 psi working pressure.
9. Refrigerant Filter-Driers: Corrosion-resistant steel shell, steel flange ring and
spring, wrought copper fittings, ductile iron coverplate with steel cap screws,
replaceable filter-drier core, 500 psi working pressure.
10. Evaporator Pressure Regulators: Provide corrosion-resistant, spring loaded,
strainless steel springs, pressure operated, evaporator pressure regulator, in size
and working pressure indicated, with copper connections.
11. Refrigerant Discharge Line Mufflers: Provide discharge line mufflers as
recommended by equipment manufacturer for use in service indicated, UL-listed.
12. Manufacturer: Subject to compliance with requirements, provide refrigeration
accessories of one of the following:
a. Alco Controls Div.; Emerson Electric CO.
b. Henry Valve CO.
c. Parker-Hannifin Corp.; Refrigeration and Air Conditioning Div.
d. Sporlan Valve Co.
e. Or equal
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Northampton, Massachusetts
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2.08 AUTOMATIC TEMPERATURE CONTROLS (DDC)
A. Basic Components and Systems:
1. General: Provide control products in sizes and capacities to match existing.
Provide shall consist of disconnecting make safe and reconnect all control
components associated with all equipment. ATC contractor shall retest units after
reconnection to ensure unit is operating correctly. Provide required components
and accessories for a complete operating system. ATC contractor shall be
responsible for surveying existing equipment and controls to ensure reconnection
operates correctly.
2. Electric Wiring:
a. All electric wiring and wiring connections, either line voltage or low voltage,
from the main electric panels to the ATC panels, and from the ATC related
panels to the individual control devices i.e. valves, dampers, equipment.
required for the installation of the control system, as herein specified shall
be provided by the control contractor unless specifically shown on the
electrical drawings or called for in the electrical specifications. The wiring
installation shall be in accordance with National and Local Codes and with
the Electrical portion of these specifications. All wiring shall be run
concealed wherever possible. Exposed wiring in occupied areas shall be
run in raceways. Raceways shall be Wiremold 200 series with all elbows,
raceways, covers, mounting stops, box extensions and wiring for a
complete and neat installation. All wiring located in mechanical spaces,
boiler rooms, fan rooms, etc. shall be installed in metal conduit
b. All wiring above ceilings, in boiler rooms, and all mechanical spaces shall
follow routing of piping and where not possible shall be in conduit. All
exposed wire shall be bundled and wire tied and shall be supported to
adjacent piping. Draped and free floating wire will not be allowed.
c. All terminations of wire at control devices shall be looped and supported
adequately.
d. All wiring shall comply with the requirements of the electrical section of the
specification.
PART 3 - EXECUTION
3.01 INSTALLATION OF EXISTING EQUIPMENT
A. Upon completion of installation of new roof existing equipment shall be installed in
original locations.
B. HVAC Contractor shall provide roof curb extensions required to achieve desired
installation height indicated on contract documents.
C. HVAC Contractor shall provide required extensions of existing system including but not
limited to ductwork, refrigerant piping, hydronic piping, ATC wiring, etc. Power wiring
extensions shall be by the Electrical Contractor. HVAC Contractor shall coordinate.
3.02 INSTALLATION OF POWER AND GRAVITY VENTILATORS
A. General: Except as otherwise indicated or specified, install ventilators in accordance
with manufacturer's installation instructions and recognized industry practices to insure
that products serve the intended function.
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B. Coordinate ventilator work with work of roofing, walls and ceilings, as necessary for
proper interfacing.
C. Ductwork: Connect ducts to ventilators in accordance with manufacturer's installation
instruction, and details on drawings.
D. Roof Curbs: Furnish roof curbs to roofing Installer for installation.
E. Electrical Wiring: Install electrical devices furnished by manufacturer but not specified
to be factory-mounted. Furnish copy of manufacturer's wiring diagram submittal to
Electrical Installer.
1. Verify that electrical wiring installation is in accordance with manufacturer's
submittal and installation requirements of Division-16 sections. Verify proper
rotation direction of fan wheels. Do not proceed with equipment start-up until
wiring installation is acceptable to equipment installer.
F. Remove shipping bolts and temporary supports within ventilators. Adjust dampers for
free operation.
G. Testing: After installation of ventilators has been completed, test each ventilator to
demonstrate proper operation of unit at performance requirements specified. When
possible, field correct malfunctioning units, then retest to demonstrate compliance.
Replace units which cannot be satisfactorily corrected.
Cleaning: Clean factory-finished surface. Repair any marred or scratched surfaces
with manufacturer's touch-up paint.
H. General: Furnish to Owner, with receipt, one spare set of belts for each belt driven
power ventilator.
3.03 INSTALLATION OF METAL DUCTWORK
A. Installation of Metal Ductwork:
1. General: Assemble and install ductwork in accordance with recognized industry
practices which will achieve air-tight (5 percent leakage for systems rated 3 in.
and under; 1 percent for systems rated over 3 in.) and noiseless (no
objectionable noise) systems, capable of performing each indicated service.
Install each run with minimum number of joints. Align ductwork accurately with
internal surface smooth. Support ducts rigidly with suitable ties, braces, hangers
and anchors of type which will hold ducts true-to-shape and to prevent buckling.
Support vertical ducts at every floor.
2. Sealing: All ductwork joints and seams shall be sealed with flexible duct sealer
to assure an airtight installation.
3. Penetrations: Where ducts pass through interior partitions and exterior walls,
and are exposed to view, conceal space between construction opening and duct
or duct insulation with sheet metal flanges of same gage as duct. Overlap
opening on 4 sides by at least 1-1/2 in.. Fasten to duct and substrate.
a. Where ducts pass through fire-rated floors, walls, or partitions, provide
firestopping between duct and substrate.
4. Coordination: Coordinate duct installation with installation of accessories,
dampers, coil frames, equipment, controls and other associated work of ductwork
system.
5. Installation: Install metal ductwork in accordance with "SMACNA HVAC Duct
Construction Standards".
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B. Installation of Flexible Ducts:
1. Maximum Length: For any duct run using flexible ductwork, do not exceed 4ft.-0
in. extended length.
2. Installation: Install in accordance with Section II of SMACNA's, "HVAC Duct
Construction Standards, Metal and Flexible".
C. Field Quality Control:
1. Leakage Tests: After each duct system, which is constructed for duct classes
over 3 in. is completed, test for duct leakage in accordance with SMACNA
"HVAC Air Duct Leakage Test Manual". Repair leaks and repeat tests until total
leakage is less than 1 percent of system design air flow.
D. Equipment Connections:
1. General: Connect metal ductwork to equipment as indicated, provide flexible
connection for each ductwork connection to equipment mounted on vibration
isolators, and/or equipment containing rotating machinery.
E. Adjusting and Cleaning:
1. Clean ductwork internally, unit by unit as it is installed, of dust and debris. Clean
external surfaces of foreign substances which might cause corrosive
deterioration of metal or, where ductwork is to be painted, might interfere with
painting or cause paint deterioration.
2. Strip protective paper from stainless ductwork surfaces, and repair finish
wherever it has been damaged.
3. Temporary Closure: At ends of ducts which are not connected to equipment or
air distribution devices at time of ductwork installation, provide temporary closure
of polyethylene film or other covering which will prevent entrance of dust and
debris until final connections are to be completed.
3.04 INSTALLATION OF DUCTWORK ACCESSORIES
A. Install ductwork accessories in accordance with manufacturer's installation instructions,
with applicable portions of details of construction as shown in SMACNA standards, and
in accordance with recognized industry practices to ensure that products serve intended
function.
B. Install turning vanes in square or rectangular 90 degree elbows in supply, return, and
exhaust air systems, and elsewhere as indicated.
C. Install access doors to open against system air pressure, with latches operable from
either side, except outside only where duct is too small for person to enter.
D. Operate installed ductwork accessories to demonstrate compliance with requirements.
Test for air leakage while system is operating. Repair or replace faulty accessories, as
required to obtain proper operation and leakproof performance.
E. Adjusting: Adjust ductwork accessories for proper settings, install fusible links in fire
dampers and adjust for proper action.
F. Cleaning: Clean factory-finished surfaces. Repair any marred or scratched surfaces
with manufacturer's touch-up paint.
G. Furnish extra fusible links to owner, one link for every 10 installed of each temperature
range; obtain receipt.
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3.05 INSTALLATION OF ROOF GRAVITY RELIEF HOODS
A. Relief hoods shall be installed and connected where indicated on roof plans. Units shall
connect to existing ductwork connections of existing systems.
B. Controls for associated system served by Gravity relief hood shall be existing to remain.
3.06 INSTALLATION OF REFRIGERANT PIPING & ACCESSORIES
A. Piping Installations:
1. Locations and Arrangements: Drawings indicate the general location and
arrangement of piping systems. Locations and arrangements of piping take into
consideration pipe sizing and friction loss, and other design consideration. So far
as practical, install piping as indicated.
2. Install pipe sleeves at all wall and floor penetrations.
3. Install escutcheons at all exposed pipe wall penetrations.
3.07 INSTALLATION OF AUTOMATIC TEMPERATURE CONTROLS (DDC):
A. Installation of Control Systems:
1. General: Install systems and materials in accordance with manufacturer's
instructions, roughing-in drawings and details shown on drawings.
2. Control Wiring: Install control wiring, without splices between terminal points,
color-coded. Install in neat workmanlike manner, securely fastened. Install in
accordance with National Electrical Code.
a. Install circuits over 25-volt with color-coded No. 12 wire in electric metallic
tubing.
b. Install circuits under 25-volt with color-code No. 18 wire with 0.031 in. high
temperature 105 deg. F. (41 deg. C) plastic insulation on each conductor
and plastic sheath over all.
c. Install electronic circuits with color-coded No. 22 wire with 0.023 in.
polyethylene insulation on each conductor with plastic-jacketed copper
shield over all.
d. Install low voltage circuits, located in concrete slabs and masonry walls, or
exposed in occupied areas, in electrical conduit.
e. Power sources from lighting circuits and wall outlets shall not be used to
power DDC controllers.
3. Controllers and safety devices:
a. All safety devices such as freezestats, duct mounted heat detectors,
smoke detectors, etc., shall be reconnected as previously installed and
tested to ensure proper operation.
B. Adjusting and Cleaning:
1. Replace damaged or malfunctioning controls and equipment.
2. Cleaning: Clean factory-finished surfaces.
3. Final Adjustment: After completion of installation, adjust thermostats, control
valves, motor and similar equipment provided as work of this section.
a. Final adjustment shall be performed by specially trained personnel in
direct employ of manufacturer of primary temperature control system.
END OF SECTION