09006 15200.pdf

SECTION 15200

DIVISION 15 – HEATING, VENTILATION AND AIR CONDITIO NING

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PART 1 GENERAL

1.01RELATED DOCUMENTS:

A. Drawings and general provisions of contract, including general and supplementary conditions and Section 1 apply to work specified in this section.

1.02SYSTEM DESCRIPTION:

A. The work under this section of the specifications shall include the furnishing and installing of all Heating, Ventilating, and Air Conditioning Equipment and material as shown on the drawings or specified herein. This shall include all items of a minor nature necessary to complete the installation and usually included in similar work whether specifically mentioned in the contract documents or not.

B. Mechanical drawings are diagrammatic and are intended to show the approximate location of outlets, ductwork, equipment and piping. Dimensions given in figure on the plans shall take precedence over scaled dimensions, and all dimensions whether given in figures or scaled, shall be verified in the field.

C. No ductwork shall be made until duct clearances are field verified. Minor offsets and transitions required because of interferences encountered in the field shall be a part of this contract and shall be made by keeping the same square inches of duct size as shown on the plans. All offsets and transitions shall be constructed per ductwork requirements of this section and shall be shown on record drawings.

1.03PROJECT/SITE CONDITIONS:

A. Before submitting a bid, carefully study the structural, architecture, mechanical, electrical and plumbing drawings. Make a careful examination of the premises and any existing work. Determine in advance, the methods of installing and connecting the apparatus, the means for getting the equipment into place, and be thoroughly familiar with all of the requirements of the contract.

B. By the act of submitting a proposal for the work required by these contract documents, this contractor shall be deemed to have made such study and examination, and to be familiar with and accept all conditions of the site.

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1.04REFERENCES:

A. All work shall be installed in accordance with all codes, laws, rules, and regulations of all National, State, County and Local authorities having jurisdiction over the premises. This shall include, but not be limited to, the International Mechanical Code, International Building Code, and the National Fire Protection Association. In case of differences, the most restrictive of said regulations shall govern. However, this shall not be construed to relieve this contractor from complying with requirements of the plans and specifications which may be in excess of code requirements.

1.05FEES, PERMITS, AND INSPECTIONS:

A. The general contractor shall secure and pay for all permits. This contractor shall arrange for all inspections and approvals required by the foregoing authorities.

1.06QUALITY ASSURANCE:

A. The mechanical systems have been designed around the makes and sizes of equipment named in the equipment schedules and shown on the drawings.

Other makes of equipment named in the specifications, shown on the drawings, or approved by the Contracting Officer in the method described in Section 1, may be furnished at this contractor's option. It is, however, this contractor's responsibility to be sure that such equipment has equal capacity, the same electrical characteristics, substantially the same physical dimensions and can be installed in the space available with ample working space around

it. Any additional costs resulting from equipment or material substitution shall be borne by this contractor.

B. The mechanical equipment schedules are shown on the drawings. The following is a list of additional equipment approved for use on this project subject to paragraph A above.

1. Air Conditioning Units: Carrier, Trane, York

2. Air Devices: Price, Carnes, Tuttle & Bailey, Titus, Krueger

3. Exhaust Fans: Greenheck, ILG, Cook, Jenn-Aire, Acme

4. Spiral Pipe: General Metals, Metal Manufacturing, Graco, Spiro FAB Inc., Spiral Pipe of Texas, 15200 - Page 3 of 14 4

CA Systems Inc.

5. Duct Fittings: Flexmaster

6. Infrared Heaters: Detroit Radiant, Co-Ray-Vac, Solaronics

7. Evaporative Coolers: Master Cool, Aerocool, Frig King

1.07SUBMITTALS:

A. Before beginning work, submit, in accordance with Division 1, copies of shop drawings or literature bound in a three-ring binder with indexed dividers showing capacities, ratings, dimensions, electrical characteristics, weights, manufacturer and model numbers on the following items:

1. Evaporative Coolers

2. Air Conditioning Units

3. Exhaust Fans

4. Infrared Heaters

5. Air Devices

6. Insulation

7. Balance contractor

8. Controls

9. Other equipment as directed by the Contracting Officer.

B. Submittals not in format of paragraph A or without numbers or unit designations as shown on plans will be returned. All submittal shall be submitted at one time and shall not be submitted in batches. (Exception:

Control drawings may be submitted later.)

C. When equipment or materials submitted differ from that specified, or in the opinion of the contractor, local conditions necessitate an arrangement of equipment or materials different from that indicated on the drawings, submit for review shop drawings showing proposed rearrangement.

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D. Before submitting any equipment or material for review, ascertain that such material or equipment will fit satisfactorily into the space allotted for it.

E. Determine prior to submittal that the equipment will fit properly into spaces designated for it. Any deviations of shop drawings from plans and specifications shall be called to the attention of the Contracting Officer in writing.

F. Voltage, phase and motors furnished under this section shall be as indicated on the electrical drawings and it shall be this contractor's responsibility to verify before final ordering of equipment.

G. Submittals are checked for general compliance only and should not be relied on for electrical or physical coordination.

1.08SEISMIC CONTROL:

A. All equipment, piping, registers and grilles, etc., shall be installed to meet local seismic code requirements (Region 2) including but not limited to the following:

1. Isolators under equipment shall have seismic restraint.

2. Ceiling diffusers and return grilles in T-bar ceilings connected to flexible duct shall be supported from structure above.

1.09CUTTING AND PATCHING:

A. The general contractor shall provide the chases and openings through walls, floors and the roof necessary for the installation of the work under this section.

B. Provide all chase and opening layouts required and furnish and set all sleeves, concrete inserts, and anchor bolts required for the installation of work under this section. This contractor will be held solely responsible for the proper size and location of all chases, openings, sleeves, inserts, anchor bolts, etc.

Failure to coordinate requirements during the normal construction sequence renders this contractor liable for all corrective construction.

1.10WORK COORDINATION WITH OTHER TRADES:

A. Electrical high voltage power wiring, conduit, interlock wiring, disconnect switches, fuses, etc., shall be furnished and installed by Section 16.

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B. Section 15900 shall furnish and install all wiring and conduit required for the controls shown on the plans and as specified in Section 15900 specifications.

PART 2 - PRODUCTS

2.01GENERAL:

A. Furnish and install where shown on the drawings, the equipment and materials of the sizes, quality, capacity and performances indicated. The equipment shall all be new with the make, model number size or capacity stamped on it or on a nameplate affixed hereto. The equipment shall be essentially the standard product of the manufacturer. Two or more units of the same class of equipment shall be products of the same manufacturer. Belts, chains, pulleys, gears, couplings, projecting set screws, key and other operating parts located on any equipment shall be fully enclosed or properly guarded per OSHA requirements.

B. Equipment too large to pass through doorways or access provided shall be set in place before the space is enclosed. When the equipment cannot be set in place before enclosing the space, equipment shall be disassembled and reassembled in the proper location. Review the equipment locations and allow a sufficient sum in his bid to accomplish this work.

2.02PIPE AND FITTINGS:

A. Air conditioning refrigerant piping shall be ACR refrigeration hard tempered tubing cleaned and capped with wrought copper fittings.

B. Refrigeration piping shall have a triple evacuation with dry nitrogen and a 12 hour holding test inspected by Contracting Officer. A written report of test results shall be submitted for approval signed by inspecting party.

2.03JOINTS:

A. Joints in copper air conditioning refrigerant piping shall be made with silfos and flux as recommended by the brazing alloy manufacturer. During brazing the pipe and fittings shall be kept full of an inert gas, dry nitrogen, or CO2, to prevent formation of scale.

B. Dielectric unions shall be provided at all connections between dissimilar metals.

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2.04PIPE HANGERS:

A. All piping within the confines of the building shall be supported by means of adjustable steel clevis hangers spaced per ASHRAE recommendations and suspended from the building construction by all thread rods. Strap, wire or chair hangers are not permitted. Where suspended from steel structural members, appropriate clamps shall be used. Hanger rods shall be sized per ASHRAE recommendations. Cleavis hangers to be sized large enough to pass insulation on insulated pipe. Provide a sheet metal saddle, minimum 12" long by 1/2 the diameter of the outside of the insulated pipe at all hangers.

B. Trapeze hangers may be used in lieu of individual clevis hangers at contractor's option. Provide hold down clamps for each pipe and a sheet cover full diameter of pipe at each hold down clamp.

C. Where piping is supported from concrete construction, approved concrete inserts shall be used.

2.05PLATES:

A. All pipes passing through walls, floors, or ceiling in finished rooms shall be fitting with polished chrome plated escutcheons.

B. All pipe escutcheons at ceilings shall be hinged type.

2.06ACCESS DOORS:

A. Provide access door as manufactured by Cesco for any concealed equipment or valves requiring access. This includes any required duct and/or ceiling access for fire dampers. Access door shall be minimum sizes required by code and be of a type compatible with ceiling or wall construction.

B. Access doors for lined duct to be insulated access door type. Access doors for wrapped duct shall have insulation trimmed back and insulation glued to the outside of the access door. All access doors to have screwdriver operated latches. Equal of Karp.

2.07PAINTING:

A. Touch-up of damaged factory finishes.

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B. All surfaces to be painted shall be thoroughly cleaned of grease, dirt and oil before paint is applied. Painting materials, the application thereof, and protection of other work shall conform to the requirements of the painting section of the specifications.

C. Paint all visible sheet metal ductwork behind grilles and registers flat black.

D. Ductwork exposed on roof shall be painted white by Section 9.

E. All exposed steel piping shall be painted by Section 9. Color to be per ASHRAE recommendations for pipe service. Primer shall be iron oxide Fed.

Spec. TT-P-31. Second and third coats for exterior piping shall be enamel alkyd resin Fed. Spec. TTP-37C and TT-E-4981 Class A. The second and third coat for exposed interior steel pipe shall be semi-gloss enamel Fed.

Spec. TT-E-508B. Installation to be per manufacturer's recommendations.

2.08DUCTWORK:

A. Furnish and install all sheet metal ducts together with necessary dampers, supports and other items required for a complete installation.

B. All ducts shall be constructed of new galvanized prime steel. Gauges and installation shall be according to latest SMACNA "HVAC Duct Construction Standards" for the 1" W.G. pressure class unless otherwise noted.

1. All duct joints, including branch duct connections, shall be sealed with hardcast.

2. Round branch duct connections shall be made with a round hole cutter and a spin-in collar sealed with hardcast. No dove tail fittings and no duct tape allowed.

3. Branch duct connections manufactured by "Air-Tite Inc." (1-501-935- 8483) may be used in lieu of spin-in collars but must still be sealed with hardcast.

C. All ductwork shall be hung with sheet metal strap hangers per latest SMACNA "HVAC Duct Construction Standards" fastened to structure above.

D. The sizes of all ducts shown on drawings are actual outside duct dimensions.

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E. Inside radius of all elbows shall be not less than 6" and shall incorporate turning vanes as shown on drawings. Turning vanes shall be single thickness with standard metal runners as manufactured by Duro Dyne or Aero Dyne.

F. Reducing elbows with turning vanes shall not be used. All elbows with turning vanes shall have the same inlet and outlet sizes with transitions as necessary downstream of the elbow.

G. Changes in duct sizes or shape shall be made with transitions as long as practicable. The maximum angle between the side and axis of the duct shall be 20 degrees unless shown on the drawings or authorized by the Contracting Officer.

H. Paint all visible sheet metal ductwork behind grilles and registers flat black.

2.09FLASHINGS:

A. Where ductwork passes through roof, provide curbs and flashings in accordance with details or plans or as directed by the Contracting Officer.

2.10FLEXIBLE DUCTWORK:

A. ATCO Series 30 UL 181 Class 1 flexible duct. Duct shall consist of a galvanized wire continuously encapsulated with layers of polyester to form an airtight continuous inner duct covered with minimum of 2" insulation with a minimum R-6 value and mylar reflective jacket. Mylar jacket to have a flame spread rating of not more than 25 and a smoke-developed rating of not more than 50. Duct connections to be made with clamps per installation recommended by manufacturer and as required by UL 181 label procedure.

Equal of Owens-Corning, Thermoflex.

B. Duct take-offs to receive flexible ducts shall be spin-in fittings. Supply air spin-in fittings shall have locking quadrant dampers. Spin-in fitting shall be sealed to trunk duct with hard cast. No duct tape allowed.

C. Pressure ratings to be minimum 4" positive on sizes 10" and below, 2" positive on sizes 12" and above and 1/2" negative on all sizes.

2.11FLEXIBLE CONNECTIONS:

A. Provide Duro Dyne UL approved neoprene-coated fiberglass flexible connections to inlet and outlet of all air moving devices.

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2.12WEATHERPROOFING:

A. Caulk watertight all ductwork exposed to the weather with GE silicone sealer.

2.13INSULATION:

A. Ductwork:

1. All air conditioning supply and return ductwork below the roof shall be insulated with 2" thick ductwrap with aluminum foil vapor barrier and a minimum installed R-5.7 value with all joints sealed. Duct wrap to be overlapped minimum 2" and secured with staples and wire. The wrap shall meet the life safety standards as established by NFPA 90A and 90B. The duct wrap shall conform to the requirements of ASTM C 518 and/or ASTM C 177, and a thermal conductivity no higher than 0.29 at 75 degrees F. Mean temperature.

2. Evaporated cooler ductwork shall not be insulated.

3. Exhaust ductwork shall not be insulated.

B. Piping:

1. Refrigerant suction line shall be insulated with 1/2" Armaflex. Armaflex exposed to weather shall have an aluminum jacket as described below.

2. Where the insulated piping is supported, provide high-density insulation inserts such as calcium silicate or equivalent of the same thickness as the adjacent pipe insulation. Inserts shall be complete (360 degree) segments of insulation, a minimum of 12" in length. The inserts shall be covered as specified herein for the adjacent piping. Provide galvanized iron saddles as specified in paragraph entitled, "Pipe Hangers".

3. Riser supports, guides and anchors for pipes which carry chilled water shall be insulated with a mixture of mastic and cork flakes to a thickness of not less than 3/8".

4. All exposed insulated piping outside the building shall have an aluminum jacket installed on the pipe in addition to the insulation as described above. The jacket shall be covered with an aluminum jacket

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0.016" thick minimum. The fittings shall be covered with 0.024" thick aluminum molded fittings covers. Covering for valves, flanges, unions, etc., shall be fitted with 0.016" thick aluminum jacket. Aluminum jacketing shall provide complete coverage for all insulation surfaces and all joints and openings for valve stems shall be sealed weather-tight. All aluminum jackets and fitting covers shall be secured with 0.020" thick aluminum straps intended for this purpose, located at all joints and spaced not more than 189" on center. Plastic fitting covers coated with two coats aluminum paint to prevent ultraviolet degradation may be used in lieu of aluminum fitting covers.

5. Before application of aluminum jackets, the pipe insulation shall be inspected and approved by the Contracting Officer.

6. Condensate piping below the roof and above the ceiling from air conditioning units shall be insulated with 1/2" Armaflex. All joints shall be sealed.

2.14SMOKE DETECTORS AND INTERLOCK WIRING:

A. On air conditioning units over 2,000 CFM, install and interlock smoke detectors to fan starter and fire alarm panel as applicable. The smoke detectors shall be located in the supply downstream of the filters and supply fan and located in the return air upstream of the outside air connection and filter. See drawings for schedule of air conditioning units. The interlock for the fire alarm panel to be by section 16.

2.15SLEEVES:

A. Where pipes pass through masonry or concrete walls or floors, (except slab or grade) pipe sleeves shall be installed. Pipe sleeves shall be Schedule 40 steel pipe for all pipes passing through fire rated floors or walls. Sleeves through concrete walls or floors shall be installed with minimum 1/4" clearance to be packed and sealed. Sleeve through floors shall extend a minimum of two (2) inches above the finished floor. Sleeves for non-rated walls shall be 18 gauge sheet metal. Sleeves through walls shall extend from finished surface to finished surface. Sleeves for uncovered pipe shall be two pipe sizes larger than the main. Sleeves for insulated mains shall be of sufficient size to pass the covering with a minimum 1/4" clearance.

B. All pipe sleeves shall be one continuous piece. The outer surface of the sleeve shall be fixed to the partition it penetrates with pour rock, mortar, etc., 15200 - Page 11 of 14 4 the internal surface shall be sealed with a UL approved flexible material to the fire rating of the partition. B10 fireshield (Conref West 602-953-7664) or equivalent.

C. Sleeve is not to support pipes as it will transmit vibration and sound to structure.

D. Solid chrome plated steel escutcheon plate shall be provided to cover the sleeves at any finished surface.

E. Copper pipe passing through a steel sleeve shall be protected with polyethylene tap or di-electric materials.

PART 3 - EXECUTION

3.01GENERAL:

A. Section 15200 work shall be performed by personnel and company with a minimum of three (3) years experience in this type of work. All work shall be under the direct supervision of a competent foreman. Verification of similar work experience shall be submitted to the Contracting Officer prior to beginning work. All work shall be planned and carried out so as not to interfere with the progress of the work by other divisions on the job.

B. Locations indicated on the drawings show the arrangement desired for the principal apparatus and shall be followed as closely as possible. The work shall be laid out on the job to secure a neat arrangement, to secure the best conditions throughout, and to overcome local difficulties and interferences where encountered. If equipment proposed is arranged differently than that specified, Section 15200 shall furnish shop drawings of all piping, ductwork and other items affected. Equipment shall be installed to permit access for service, and permit removal of fan shafts, tubes, filters, etc. All installations shall be made as recommended by the equipment manufacturers.

3.02PIPING:

A. All piping shall be accurately cut and installed in place without forcing.

Change in direction shall be made with fittings. Bending is not permitted. All exposed pipe shall, where practicable, be run parallel to or at right angles to the lines of the building. Piping shall avoid all windows, doors or other openings and shall be installed so as not to weaken any structural part of the building. Reducing fittings shall be used where pipe sizes change rather than

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B. Pipe shall be supported at sufficiently close intervals to keep it in alignment and prevent it from sagging.

C. Piping shall be run so as not to interfere with the work of other contractors.

D. Isolate all copper from contact with steel, concrete or masonry.

3.03TESTS AND ADJUSTMENTS:

A. All temperature control and other automatic devices shall be thoroughly tested and adjusted.

B. Lubricate, start-up and operate all equipment and demonstrate its operation and compliance with the specifications. Any undue noise, vibration and/or other objectionable features shall be promptly repaired and/or the device replaced and the system retested. Register vanes shall be adjusted to deflections indicated by the drawings to obtain proper distribution and throw.

Cooling and heating equipment shall be operated and tested and all controllers, safety devices, etc., checked and adjusted where necessary.

Notify the Contracting Officer of the Test and Adjustments schedule a minimum of seven working days in advance.

C. All systems shall be placed in service and be operating properly for a period of not less than seven consecutive 24-hour days before acceptance.

3.04CLEANING-UP:

A. At all times keep the building and premises in a neat manner. All instructions issued by the Contracting Officer in regard to storage of materials, protective measures, cleaning of debris etc., shall be explicitly followed. Upon completion of the work, thoroughly clean all machinery, piping, etc., and leave areas directly affected by his work broom clean.

3.05RECORD DRAWINGS:

A. Purchase a reproducible transparency of the mechanical plans from the Contracting Officer. Record all changes from the contract drawings and return original and designated "record drawings".

3.06BALANCING:

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A. The air systems shall be balanced as per AABC standards and four (4) copies of a balance report furnished to the Contracting Officer on forms published by AABC. The duct shall have a maximum CFM leakage rate of 1% per hundred lineal feet of duct.

B. An independent test and balance agency, not affiliated with installing contractor or equipment suppliers for this project, whose regular business is the specialty of testing and adjusting air conditioning systems, shall be engaged to provide testing and balancing work. The agency shall possess current membership in the Associated Air Balance Council (AABC).

C. The following agencies are approved:

1. Systems Commissioning & Testing

2. General Air Control

D. All outlets shall be balanced until each outlet delivers substantially its specified amount. Similarly balance all return, exhaust and outside air grilles and louvers.

E. Adjust the louvers in all supply outlets to produce air distribution satisfactory to the occupants.

F. All measurements of air quantities delivered by grilles shall be made in a manner approved by the manufacturer of the grille.

G. Changes to pulleys, drives, etc., shall be part of the balance responsibility.

H. All work shall be guaranteed for a period of sixty (60) days. TAB contractor shall make adjustments during this period for comfort level adjustment, at direction of Contracting Officer. TAB contractor shall meet with Contracting Officer during this period as may be required to verify any readings.

3.07FILTERS:

A. Filters to be Farr 30/30 or AAF AM-Air 300. Install a new set of filters after final inspection.

3.08OPERATION AND MAINTENANCE MANUAL:

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A. Furnish to the Contracting Officer, in accordance with Division 1, copies of an operating and maintenance manual contained in a three-ring binder with hard cover. Manuals shall be loose-leaf bound and shall contain manufacturer's cuts of all equipment furnished, spare parts list, sequence of operation and a preventative maintenance schedule identifying daily, weekly, monthly and seasonal maintenance procedures as required. Instruct the maintenance personnel in the operation of the system and submit three copies of a letter signed by the Contracting Officer attesting to such instructions.

3.09GUARANTEES:

A. Guarantee work to be free from defects in workmanship and material for a period, as indicated in Division 1, from the date of final acceptance. Any material or equipment furnished by him which proves defective within the period shall be promptly repaired or replaced by that contractor without cost to the Government. This shall include replacement of any refrigerant lost from the system. Furnish a letter stating that the system has been installed in accordance with the contract documents and with any deviations detailed in full. Standard factory warranties shall be provided on all equipment furnished and evidence of same shall be furnished to the Contracting Officer in triplicate.

B. Provide a minimum five year warranty on all air conditioning compressors.

C. Provide a minimum two year warranty on all evaporative cooler media.

END OF SECTION