Section 15010, Mechanical Provisions (1) Related Documents

the presence of a factory representative of the boiler manufacturer. Provide a

startup report by the representative, including combustion analysis and

performance, control settings and a performance chart of the control system

furnished. Submit a letter of certification with start-up report from this

representative stating that the boilers are in proper operating order.

B. The BMCS panel shall be programmed at the time of manufacturer to the extent possible in order to prevent extended delays during startup phase.

C. As-built Data: After startup and final commissioning of Boilers and Controls,

provide a CD with current parameters of BMCP and a typewritten Sequence

of Operation for the Boilers and Pumps.

(12) Coordinate wiring so that all burners and controls for each fired device are powered from a single electrical circuit serving that device.

(13) Pipe overflows from back-flow preventers, air vents and relief valves to drain with air gap. Coordinate with PSD No. 1.

(14) Install boiler pipe, flue, drains, pressure regulators and other appurtenances per manufacturer’s recommendations.

(2) Submittals per Section 1300

A. Manufacturer’s data sheets for all equipment and components, highlighted to show applicable features, including all size, capacity data, electrical characteristics and a control diagram showing all components and a written sequence of operation.

B. Start-up report.

(3) Quality Assurance:

A. Qualifications: Equipment manufacturer must specialize in the manufacture of the products specified and have five years experience with the equipment and refrigerant offered.

B. Regulatory Requirements: Comply with the codes and standards specified.

C. Acceptable Manufacturers: Carrier and Trane rotary screw machines, only.

(4) Delivery and Handling:

A. Chillers shall be delivered and unloaded at the job site completely assembled and charged with R-22 or 104A, refrigerant and oil by the manufacturer.

B. Comply with the manufacturer’s instructions for rigging and handling equipment.

(5) Warranty:

The refrigerant equipment manufacturer’s warranty shall be a period of five years from date of substantial completion. It shall cover defects in material and workmanship which have proven defective within the above period, including refrigerant lost due to a warranty failure.

(6) Chiller Capacities

(To be determined) Ton Nominal at ARI conditions:

High

Leaving Chilled Water Temperature 40 deg F

Ambient Condenser Entering Air Temperature 95 deg F

Percent by Volume inhibited Propylene Gycol 30% 35%

GPM Evaporator Flow Rate TBD

Minimum EER 9.4 (minimum)

(7) Unit Description:

Provide for installation by others a factory assembled, factory charged, and factory run tested air-cooled packaged chiller. Chiller shall consist of multiple compressors, direct expansion evaporators or chillers as required, air-cooled condenser section, control system and all components necessary for safe and controlled unit operation

(8) Design Requirements:

A. General: Provide a complete packaged chiller as specified herein.

B. Performance: The chiller shall be capable of stable operation to a minimum of 12.5 percent of full load without hot gas bypass. Nominal performance shall be in accordance with ARI Standard 590.

C. Acoustics: Sound pressure levels for the units shall meet or be lower than 75 dBA on the overall “A” weighted sound pressure level. Measurements to be taken at full load at a distance of 30 feet from the side of the unit.

(9) Chiller Components

A. Screw Compressors: The compressors shall be field serviceable, factory mounted on vibration isolators. The manufacturer shall provide an extended 5-year parts and labor warranty, including refrigerant. Submit certification of 5-year warranty at project closeout.

Electric motors shall be hermetically sealed, squirrel cage induction type and cooled by circulating liquid refrigerant. Full load power factor shall be a minimum of 0.90. Compressor motors shall have both thermal and current sensitive overload devices, and shall have reverse rotation protective controls.

B. Evaporator: The evaporator shall be direct expansion type with carbon steel shell, polypropylene water baffles, and high efficiency internally finned copper tubes rolled into steel tube sheets. Refrigerant heads shall be removable. The evaporator shall be insulated with 1-1/2 inch closed cell polyurethane insulation. The evaporator shall be designed, inspected, and stamped in accordance with ASME Section VII requirements. The shell shall have drain and vent connections. Fouling factor shall be ARI standard.

C. Condenser: The condenser coils shall have seamless copper tubes mechanically bonded into plate type fins. The fins shall have full drawn collars to completely cover the tubes. A subcooling coil shall be an integral part of the main condenser coil. Condenser fans shall be propeller type arranged for vertical air discharge and individually drive by direct drive fan motors. Each fan shall be in its own compartment to eliminate cross flow of condenser air during fan cycling and shall be equipped with a heavy-gauge fan guard. Fan motors shall be weather protected, single-phase, direct-drive, open drip-proof type.

D. Refrigerant Circuit: The unit must have refrigerant circuits completely independent of each other with at least one compressor per circuit. Each circuit shall include an electronic expansion valve, compressor suction and discharge shutoff valves, a liquid line shutoff valve, replaceable core filter-drier, sight glass with moisture indicator, liquid line solenoid valve (no exceptions), and insulated suction line. Unit shall include suction and discharge pressure gages or digital display and separate access ports for gage manifold connections and charging port.

E. Unit casing and all structural members and rails shall be fabricated of continuous G90 galvanized steel. The control enclosure and unit panels shall be cleaned and phophatized, then painted with a urethane finish. Unit base, structural members, and fan panel tops shall not be painted.

F. Microprocessor Based Control System: A NEMA Type 3R weatherproof control panel contain the field power connections points, control interlock terminals, and control system. Power and starting components shall include factory fusing of fan motors and control circuit; individual contactors for each fan motor, solid-state start time, solid-state compressor three-phase motor overload protection, inherent fan motor overload protection and single-point unit power terminal blocks for connection to remote disconnect switch. Hinged access doors shall be lockable. Barrier panels are required to protect against accidental contact with line voltage when accessing the control system.

1. Enclosure shall be ventilated with thermostatically controlled electric

fan with filtered inlet and weather-proof exhaust.

The system shall stage the unit based on the leaving water temperature. Safeties controlled by the microprocessor include motor protection, high discharge pressure, loss of refrigerant, loss of water flow, freeze protection, low oil, and low refrigerant pressure. Controls shall include auto/stop switch, chilled water temperature and setpoint, operating temperatures and pressure, and diagnostic messages. The following features and functions shall be included:

1. The LCD type display shall have a minimum of 32 characters with all messages in English. Coded messages and LED displays are not acceptable.

2. Critical parameters shall have their own section of control and be password protected.

3. Resetting chilled water temperature by either controlling the return water temperature and by remote 4-20mA DC signal.

4. A soft load function, to prevent the system from operating at full load during the chilled fluid pull-down period.

5. Electronic time clock to allow programming of a yearly startup schedule.

6. Auto restart after a power failure without an external battery backup or auxiliary power for maintaining program memory.

7. Safety shutdowns shall be date and time stamped with system temperatures and pressures recorded. A minimum of six previous occurrences shall be kept in a revolving memory.

8. Start-to-Start and stop-to-start timers to provide minimum compressor off-time with maximum motor protection.

9. Capability of communications with a PC or remote monitoring through a twisted par RS-232 interface.

10. Lead-lag by manual selection or automatically by circuit run hours.

11. Discharge pressure control unloading in response to high discharge pressure or low evaporator pressure.

12. Pro-active compressor unloading in response to high discharge pressure or low evaporator pressure.

13. Continuous diagnostic checks of unit operation to provide a pre-alarm signal in advance of a shutdown allowing time for remedial action to be taken.

14. Control circuit transformer, factory mounted.

15. Delta-delta reduced inrush starters, factory mounted.

16. Ground fault protection, factory installed.

17. Low ambient head pressure control to 0 deg F (-17.8 deg Celsius), factory mounted.

18. Protective welded wire lower guards on compressor section.

19. Control system microprocessor shall have built-in surge, spike, and transient voltage protection.

20. 115 V GFI convenience outlet.

21. Non Electronic chilled water flow switch (if required for operation).

(10) Electrical:

Unit shall operate one 460 volt, 3 phase, 60 Hz power. Control voltage shall be provided by an internal 115 volt, single phase, 60 Hz control power transformer.

(11) Startup:

A. Ensure proper charge of refrigerant and oil

B. Adjust and level chiller, provide all required appurtenances.

C Provide authorized factory starting of chillers and instruction to PSD No. 1 on proper operation and maintenance. Submit start-up report and printed sequence of operations.

(12) Install units where shown on the drawings and in accordance with manufacturer’s recommendations. If manufacturer’s instructions conflict with specifications or drawings, clarify with Engineer prior to proceeding. Conflicting work shall be corrected to Engineer’s satisfaction at no additional cost to Owner.

(13) Vibration Isolation:

A. Isolate all equipment and piping within chiller from casing and frame.

B. Provide properly sized equipment base and rubber-in-shear type vibration isolators under chiller. Obtain written statement from refrigeration equipment manufacturer that the support and isolation is suitable for the application.

C. Provide piping isolators on all refrigerant piping. Arrange piping and support to prevent noticeable sound and vibration transmission to building structure.

(14) Coordination:

Fully coordinate and work directly with the Balancing and Testing Agency as directed by the Mechanical Contractor to provide all systems in proper operating order. Make corrections and adjustments as required by the Testing and Balancing Agency, in a timely manner.

Section 15850, Air Handling and Distribution
(1) Description: this section describes specific requirements, products, and methods of execution relating to the project air handling and distribution, exhaust and control system. Provide all HVAC systems as specified, fully functional and complete in every detail

(2) Submittals per section 1300

A. Manufacturer’s technical product data for all equipment and components, highlighted to show applicable features, including all size, capacity data, electrical characteristics and a control diagram showing all components and a written sequence of operation. Submit fan performance curves clearly showing specified operating point with TSP, power, RPM, and efficiency indicated.

B. Submit assembly-type drawings showing unit dimensions, weight loadings, required clearances and field connection details.

C. Air diffuser and grilles: Product data showing dimensions, details of construction, and performance data, including air volumes, outlet velocity, pressure drop, throw, and noise level throughout variable flow volume range.

(3) Ductwork:

A. Ductwork Systems:

1. Ductwork Construction: Galvanized steel sheets in accordance with SMACNA HVAC Duct Construction Standards, Metal and Flexible. Sheet steel shall be ASTM A653 with G-90 galvanized coating.

a. Applicable duct construction pressure classification is 2.0 inches water gage for supply and return ductwork, 2.0 for exhaust ductwork.

b. Exposed Ductwork: 20 gauge minimum, round shall be spiral seam. Do not dent, scratch, warp or allow deflection in ductwork. Install duct work neat, square and true. All cut edges shall be square and true. No visible gaps or cracks are allowed. Hangers shall be equally spaced, all thread rod type. Fasteners shall be installed in uniform neatly spaced columns and rows. Touch-up scratches and cut edges with ZRC.

c. Ductwork Seal Class designation is A for all ductwork: seal all transverse joints, longitudinal seams, and duct wall penetrations.

d. Provide tapered transitions at all changes in duct size and at connections to fans and other equipment.

e. Turning Vanes: In all 90 degree turns in ducts provide single thickness turning vanes or 1-1/2 radius elbows.

f. Duct passing through exit corridors shall be 26 gage, minimum.

g. Ducts passing through roof shall have weatherproof leak-tight penetrations properly flashed and sealed.

h. Duct shall be round or rectangular as required or shown, no exceptions. Duct dimensions shown are net clear inside dimensions, see Section 15250.

2. Flexible Duct

a. Do not use flexible duct unless specifically called for on the plans.

b. At diffuser connections and return outlets where shown flex duct shall not be exposed.

1) Provide duct listed as UL-181 Class I air duct and constructed in compliance with NFPA 90A, R-value of 5.5 minimum, with inner liner and durable tear and puncture resistant outer liner.

2) Maximum length 6’. Install with not more than 90 degree full radius bend.

3) Make joints with stainless steel quick lock pivoting head metal screw clamps or drawband.

4) Clamps-Tridon LS Series, Duct Tape Nashua 357, Drawbands Panduit PLT-H, or equal.

5) All elbows shall be rigid metal duct.

c. Provide bell mouth spin-in fitting with damper at all take-offs Flexmaster Series 3000S, or equal.

d. Manufacturer: Valuflex UPC #090 or approved equal.

(4) Duct Accessories:

A. Dampers

1. Not all volume dampers are shown on the drawings.

2. Provide air volume dampers at each duct branch for supply, return, and exhaust ductwork and in the duct leading to each supply, return, and exhaust openings to adjust the system to produce the design air quantities, and as required.

3. Provide opposed blade dampers in grilles or diffusers if insufficient clearance exists between terminal device and duct for installation of volume damper in branch duct.

4. Relocate dampers in ductwork and provide elbows, extensions, and other ductwork construction as required to eliminate noise.

5. Volume Dampers.

a. Damper Quadrants: indicating dial regulator and sealed end bearings. Provide remote operators at hard ceilings and other areas as required, Vent Fabrics or approved equal.

b. Damper fabrication:

1) Minimum gage and duct construction shall be in accordance with SMACNA standards.

2) Airfoil damper blade shall be aligned with handle and index pointer.

3) All operators accessible and lockable.

4) Maximize distance from branch dampers to diffusers.

Locate damper a minimum of 3 feet from diffusers.

5) All damper shafts shall have sealed bearings.

6. Motorized Dampers

a. Ruskin CD 35 with Belimo line voltage actuator.

B. Gravity Backdraft Dampers

1. Provide back draft dampers counter-balanced to desired static pressure setting. Wide open static pressure not to exceed 0.15 inch water column.

2. Damper blades aluminum with vinyl edge seals.

3. Damper Frames extruded Aluminum, synthetic bearing material.

4. Assembly designed for operation at (-20) degrees F.

5. Manufacturer: Ruskin CBD-2 or approved equal.

C. Access Panels and Doors

1. System Access Panels.

a. Sheet-metal doors reinforced, cross-bracketed, or otherwise.

b. Seal doors airtight with felt edged gaskets.

c. Secure with hinges and sash locks.

d. Ruskin ADC or equal.

e. Entire assembly UL rated as required.

D. Flexible fabric ductwork and equipment connections: 30 oz. Ventfabrics Ventglas or Duro-Dyne Durolon neoprene coated fire retardant glass fabric.

E. Duct Sealer: Oil resistant elastomer containing approximately 50% solids by weight in blended ketone solvent. Container label shall show name of material, date of manufacture, shelf-life, curing time, mixing and application instructions. RCD Corporation non-flammable water based air duct sealant or equal.

F. Zinc Rich Coating: Southern Coatings Inc. “Galvicon”, ZRC products Co. “ZRC”, or equal. Touch up damaged surfaces on galvanized surfaces with zinc-rich coating.

G Fasteners: ASTM A-307, Grade A or B with ASTM A 563 heavy nuts, UNC threads, cadmium plating or electro-galvanizing finish.

(5) Grilles, Registers and Diffusers

A. Provide grilles, registers, and diffusers of the types, sizes and manufacturer in this specification called for on plans and in schedule on drawings.

B. Provide diffusers of the size, style, and manufacturer called out on drawings

1. Diffuser shall be tested in accordance with ASHRAE Standard 70-1991.

2. Diffusers shall be constructed of steel, unless noted otherwise. Cone type diffusers shall be of multiple single-piece cone construction with the back cone including an integrally drawn inlet (welded-in inlets and corner joints are not acceptable). Modular core type diffusers shall consist of fixed louver directional modules, which can be easily repositioned in the field without tools for 1, 2, 3, or 4-way discharge.

3. Diffuser finish shall be white, baked on, with a pencil hardness of HB to H. The paint must pass a 100-hour ASTM D117 Corrosive Environment Salt Spray Test without creepage, blistering, or deterioration of film. The paint must pass a 250- hour ASTM-870 Water Immersion Test. The paint must pass the ASTM D-2794 Reverse Impact Cracking Test with an applied force of 50 inch pounds.

C. Provide round, square or rectangular diffusers complete with equalizing grid. Install grids orientated to square diffuser face.

D. Equip diffusers with panels of the proper size to match the suspended ceiling layout or with the proper frame for surface mounting. Fully correlate diffuser and grille style, dimension, and fit with ceiling.

E. Manufacturers: Metal-Aire, Titus or Krueger, no exceptions.
(6) Filters:

A. Disposable Filters.

1. Capacities and sizes as required or provided with equipment. UL Class II.

2. Filters: Pleated non-woven cotton fabric type with frame and support grid. 25 to 30 percent efficient per ASHRAE 52-76. FARR 30-30 or approved equal.

(7) Sound Control:

A. Lined Duct: See Section 15250.

(8) Fire/Smoke Dampers:

A. Fire/Smoke Dampers:

1. Code Compliance: Provide fire/smoke dampers with a UL 555 label for fire rating indicated and in conformance with NFPA 90A.

2. Multiple blade type with fusible link and spring operator, powered open by integral electric motor 115V, 60 Hz. Minimum leakage by Authority having Jurisdiction.

3. Dampers shall be suitable for horizontal or vertical installation with accessories as required.

4. Minimum fuse temperature: 195 deg F.

B. Front Access Fire/ Smoke Dampers.

1. Entire assembly UL labeled. Airfoil shaped opposed blade damper with integral sleeve and accessory cabinet.

2. Manufacturer: Ruskin FSD60FA.

C. Fire/Smoke Dampers.

1. Entire assembly UL labeled.

2. Manufacturer: Ruskin, style, time rating, and model as recommended by manufacturer for the application, damper shall have maximum air pressure drop of 0.1 inches water column at design cfm.

(9) Indoor Air Handling-Units:

A. Indoor air handling units shall be by the McQuay Company.

B. Alternate manufacturers complying with plans and specifications must be submitted and approved by the engineer within 10 days prior to bid date. Acceptance of alternate manufacturer does not imply technical requirements of specification (including but not limited to all performance criteria, efficiencies and warranties) are waived.

C. General Description:

1. Configuration: Fabricate as detailed on prints.

2. Performance: Conform to ARI 410 and 430 Standards. See schedule on

3. Acoustics: Sound power levels (dB) for the unit shall not exceed the specified levels shown on the unit schedule. The manufacturer shall provide the necessary sound treatment to meet these levels if required.

D. Unit Construction

1. Fabricate unit with heavy gauge channel posts and panels secured with mechanical fasteners. All panels, access doors, and ship sections shall be sealed with permanently applied bulb-type gasket. Shipped loose gasketing is not allowed.

2. Panels and access doors shall be constructed as a 2-inch nominal thick; thermal broke double wall assembly, injected with foam insulation with and R-value of not less than R-13.

a. The outer panel shall be constructed of G90 galvanized steel.

b. The inner liner shall be constructed of G90 galvanized steel.

c. The floor plate shall be constructed as specified for the inner liner.

d. Unit will be furnished with solid inner liners.

3. Panel deflection shall not exceed L/240 ratio at 125% of design static pressure, maximum 5 inches of positive or negative static pressure. Deflection shall be measured at the panel midpoint.

4. The casing leakage rate shall not exceed .5 cfm per square foot of cabinet area at 5” static pressure.

5. Module to module field assembly shall be accomplished with an overlapping, full perimeter internal splice joint that is sealed with bulb type gasketing on both mating modules to minimize on-site labor and meet indoor air quality standards.

6. Access doors shall be flush mounted to cabinetry, with minimum of two six inch long stainless steel piano-type hinges, latch and full size handle assembly. Access doors shall swing outward for unit sections under negative pressure. Access doors on positive pressure sections, shall have a secondary latch to relieve pressure and prevent injury upon access.

7. An 8-inch formed G60 galvanized steel base rail shall be provided by the unit manufacturer for structural rigidity and condensate trapping. The base rail shall be constructed with 12-gauge nominal for unit sizes 003-035 and 10-gauge nominal for unit sizes 040-090. The following calculations shall determine the required height of the base rail to allow for adequate drainage. Use the largest pressure to determine base rail height. [(Negative)(Positive) static pressure (in)] (2) + 4”= required base rail height. Should the unit base rail not be factory supplied at this height, the contractor is required to supply a concrete housekeeping pad to make up the difference.