Section 15010, Mechanical Provisions (1) Related Documents

E. Fan Assemblies:

1. Acceptable fan assembly shall be a double width, double inlet, class I, belt-drive type housed forward curved fan dynamically balanced as an assembly, as shown in schedule. Maximum fan RPM shall be below first critical fan spend. Fan assemblies shall be dynamically balanced by the manufacturer on all three planes and at all bearing supports. Copper lubrication lines shall be provided and extend from the bearings and attached with grease fittings to the fan base assembly near access door. If not supplied at the factory, contractor shall mount copper lube lines in the field. Fan and motor shall be mounted internally on a steel base. Factory mount motor on slide base that can be slid out the side of unit if removal is required. Provide access to motor, drive, and bearings through hinged access door.

2. Acceptable fan assembly shall be a double width, double inlet, class II, belt-drive type housed forward curved fan dynamically balanced as an assembly, as shown in schedule. Maximum fan RPM shall be below first critical fan spend. Fan assemblies shall be dynamically balanced by the manufacturer on all three planes and at all bearing supports. Copper lubrication lines shall be provided and extend from bearings and attached with grease fittings to the fan base assembly near access door. If not supplied at the factory, contractor shall mount copper lube lines in field. Fan and motor shall be mounted internally on a steel base. Factory mounted motor on slide base that can be slid out the side of unit if removal is required. Provide access to motor, drive, and bearings through hinged access door.

3. Fan and motor assembly shall be mounted on 2” deflection spring vibration type isolators inside cabinetry.

1. Bearings: Basic load rating computed in accordance with AFMBA-ANSI Standards. The bearings shall be designed for service with an L-50 life of

500,000 hours and shall be a heavy duty pillow block, self-aligning, grease-lubricated ball or spherical roller bearing type.

2. Shafts shall be solid, hot rolled steel, ground and polished, keyed to shaft, and protectively coated with lubricating oil. Hollow shafts are not acceptable.

3. V-Belt drives shall be cast iron or steel sheaves, dynamically balanced, bored to fit shafts and keyed. Fixed sheaves, matched belts, and drive rated based on motor horsepower. Minimum of 2 belts shall be provided on all fans with 10 HP motors and above. Standard drive service factor minimum shall be 1.1 S.F. for 1/4 HP – 7.5 HP, 1.3 S.F for 10 HP and larger, calculated based on fan brake horsepower.

4. Variable frequency drives shall be per Item 12 of this specification, as required.

1. Fan motors shall be manufacturer provided and installed, Open Drip Proof, premium efficiency (meets or exceeds EPAct requirements), 1750 RPM, single speed, 230-460V / 60 HZ / 3P. Complete electrical characteristics for each fan motor shall be as shown in schedule. See 7 below for VFD driven motors.

2. Wiring Termination: Provide terminal lugs to match branch circuit conductor quantities, sizes, and materials indicated. Enclosed terminal lugs in terminal box sized NFPA 70.

3. Manufacturer shall provide ASHRAE 90.1 Energy Efficiency equation details for individual equipment to assist Building Engineer for calculating system compliance.

4. Installing contractor shall provide GFI receptacle within 25 feet if unit to satisfy National Electrical Code Requirements.

5. All motor starter components shall be furnished by others and mounted in the field.

6. Variable frequency drive shall be furnished and mounted by manufacturer. See schedule for special options.

7. Variable frequency driven motors shall be rated per NEMA MG1, Part 31, “Inverter Fed Motors”.

H. Cooling and/or Heating Coils

1. Certification: Acceptable water cooling and refrigerant coils shall be certified in accordance with ARI Standard 410 and bear ARI label. Coils exceeding the scope of the manufacturer’s certification and/or the range of ARI’s standard rating conditions will be considered provided the manufacturer is a current member of the ARI Forced Circulation Air- Cooling and Air-Heating Coils certification programs and that the coils have been rated in accordance with ARI Standard 410. Manufacturer must be ISO 9002 certified.

2. Water cooling and/or heating coil sized, rated for and suitable for use with 35% glycol, shall be provided. Provide access to coil(s) for service and cleaning. Enclose coil headers and return bends fully within unit casing. Unit shall be provided with coil connections that extend a minimum of 5” beyond unit casing for ease of installation. Drain and vent connections shall be provided exterior to unit casing. Coil connections must be factory sealed with grommets on interior and exterior panel liners to minimize air leakage and condensation inside panel assembly. If not factory packaged, Contractor must supply all coil connection grommets and sleeves. Coil shall be removable through side and/or top panels of unit without the need to remove and disassemble the entire section from the unit.

3. Headers shall consist of seamless copper tubing to assure compatibility with primary surface. Headers to have intruded tube holes to provide maximum brazing surface for tube to header joint, strength, and inherent flexibility. Header diameter should vary with fluid flow requirement.

4. Fins shall have a minimum thickness of 0.0075 inch aluminum plate construction. Fins shall have full drawn collars to provide a continuous surface cover over the entire tube for maximum heat transfer. Tubes shall be mechanically expanded into the fins to provide a continuous primary to secondary compression bond over the entire finned length for maximum heat transfer rates. Bare copper tubes shall not be visible between fins.

5. Coil tubes shall be 5/8 inch OD seamless copper, 0.020 inch nominal tube wall thickness, expanded into fins, brazed at joints. Soldered U-bends shall be provided to minimize the effects of erosion and premature failure having a minimum tube wall thickness of .025 inches.

6. Coil connections shall be carbon steel, NPT threaded connection. Connection size to be determined by manufacturer based upon the most efficient coil circulating. Vent and drain fittings shall be furnished on the connections, exterior to the air handler. Vent connections provided at the highest point to assure proper venting. Drain connection shall be provided at the lowest point to insure complete drainage and prevent freeze-up.

7. Coil casing shall be a formed channel frame of galvanized steel.

1. Furnish flat panel filter section with 2-inch throw away MERV 5 filter. Provide side loading and removal of filters.

2. Furnish angled filter in mixing box section with 2-inch throw away MERV 5 filter. Provide side loading and removal of filters.

3. Filer media shall be UL 900 listed, Class I or Class II.

4. Contractor shall provide and install a magnehelic air filter gage for measuring resistance to actuated air flow through the filters, one for each bank of filters. The gage shall be diaphragm actuated with pointer zero adjustment and have a 3 7/8” diameter white dial with black figures and graduations. Accessories shall include surface mounting bracket, two static pressure tips, 6’ lengths aluminum tubing and vent valves. Gages shall be Dwyer Model 2001 (0 – 1.0 in wc range), or equal.
J. Additional Section

1. Plenum section shall be provided and properly sized for inlet and/or discharge air flow (between 600 and 1500 feet per minute). The plenum shall provide single or multiple openings as shown on drawings and project schedules.

2. Access section shall be provided for access between components,

3. Mixing box section shall be provided with bottom outside air opening and no return air opening with or without parallel low leak airfoil damper blades. Damper shall be hollow core galvanized steel airfoil blades, fully gasketed and have continuous vinyl seals between damper blades in a galvanized steel frame. Dampers shall have stainless steel jamb seals along end of dampers. Linkage and ABS plastic end caps shall be provided when return and outside air dampers sized for full airflow. Return and outside air dampers of different sizes must be driven separately. Damper Leakage: Leakage rate shall be less than two tenths of one percent leakage at 2 inches static pressure differential. Leakage rate tested in accordance with AMCA Standard 500.

a. Mixing box section shall be provided with bottom outside air opening and end return air opening with or without parallel low leak airfoil damper blades. Dampers shall be hollow core galvanized steel airfoil blades, fully gasketed and have continuous vinyl seals between damper blades in a galvanized steel frame. Dampers shall have stainless steel jamb seals along end of dampers. Linkage and ABS plastic end caps shall be provided when return and outside air dampers sized for full airflow. Return and outside air dampers of different sizes must be driven separately. Damper Leakage: Leakage rate shall be less than two tenths of one percent leakage at 2 inches static pressure differential. Leakage rate tested in accordance with AMCA Standard 500.

4. Mixing box section shall be provided with end outside air opening and bottom return air opening with or without parallel low leak airfoil damper blades.. Damper shall be hollow core galvanized steel airfoil blades, fully gasketed and have continuous vinyl seals between damper blades in a galvanized steel frame. Dampers shall have stainless steel jamb seals along end of dampers. Linkage and ABS plastic end caps shall be provided when return and outside air dampers sized for full airflow. Return and outside air dampers of different sizes must be driven separately. Damper Leakage: Leakage rate shall be less than two tenths of one percent leakage at 2 inches static pressure differential. Leakage rate tested in accordance with AMCA Standard 500.

(10) Variable Air Volume (VAV) Terminal Box

A. General: Factory-assembled, externally powered, variable air volume control terminal. Unit shall be complete with a damper assembly, flow sensor, externally mounted volume controller, collars, for duct connection and all required features. Control box shall be clearly marked with identification label that lists such information as nominal cfm, maximum and minimum all limits, coil type and coil hand, where applicable.

B. Unit Cabinet:

1. Constructed of 22-gage galvanized steel with round or rectangular inlet collar rectangular discharge with slip and drive connection. All primary air inlet collars shall accommodate standard flex duct sizes.

2. Insulated with ½ in. thick, 1.5-lb, equivalent density mat-faced insulation that meets requirements of UL 181 and NFPA-90A.

C. Damper Assembly: The control air damper assembly shall be constructed of heavy gauge galvanized steel with solid shaft rotating in Delrin® bearings. Damper shaft shall be marked at the end to indicate damper position. Damper blade shall incorporate a flexible gasket for the airflow shutoff and operate over a full 90º.

D. Controls: Units shall have pressure-independent pneumatic, electronic, or communication controls, as specified, capable of maintaining required airflow set points +/–5% of the unit capacity at any inlet pressure up to 6-in. wg. The controllers shall be capable of resetting between factory or field-set maximum and minimum (>350 fpm inlet duct velocity) set points to satisfy room thermostat demand. The unit shall be equipped with an amplified flow probe located in unit inlet. Air flow for the pressure independent controller (supplied by others) shall be determined with a factory supplied 12 point total pressure, center averaging cross flow sensor, having magnification resulting in no greater than 2625 fpm at 1” developed signal.

1. Hot Water Heating Coil: Coil shall be mounted in a minimum 20 Ga. Galvanized steel casing with slip and drive discharge connections, and factory mounted on the base unit shown on the equipment drawings. Coils shall have:

b. Number of coil rows and circuits shall be selected to provide performance as required by the plans.

c. Up to 4 rows as shown on equipment drawings or designed on

equipment schedule. Right or left-hand fittings with sweat connection sizes as indicated on equipment drawings.

F. Performance: The pressure drop through the units shall not exceed scheduled values, including hot water coils.
G. Acoustical Requirement

1. Unit supplied shall be rated in accordance with ARI 880 certification program at the rate flow rates and pressures. The unit manufacturer shall furnish octave band sound power data for both casing radiated and discharge sound levels with the selected lining and above flow sensor, as tested per ARI Industry Standard 880-98, at the required flow rates and inlet pressures. Both Discharge and Radiated sound data shall result in room Sound Pressure levels not to exceed those listed below, with tolerance of + 2 dB in any band for less than 20% of the units, when determined in accordance with ARI 885-98 Appendix B with the following listed assumptions”

Sound Criteria : High Speech Privacy

Octave Band : 2 3 4 5 6 7

Room Sound : 57 53 48 43 37 31

b. Application Assumptions

Nominal Duct Size = 12 Nominal Duct Ps = 1.0.

Sound Power Division based on 2 Power Splits

5 feet of Lined Duct

5 feet of 8” Flexible duct

End reflection based on a 10” round duct

Room Absorption based on a 2400 cubic foot room, 5 feet from the source:

Room Effect, dB: 5 7 8 9 10 11

----- Radiated Sound Assumptions -----
ARI 885-98 assumes that ceiling located sound sources are not point, but area sources, and the room attenuation is included in the ceiling/space effect, based on the ceiling tile selected.
Ceiling: ARI 885-98 Type 2, 10 pcf Mineral Tile

Octave Band: 2 3 4 5 6 7

Total Space Effects: 15 17 19 25 30 33
c. Maximum Allowable Sound Power: Based on the assumption above, neither Radiated or Discharge Unit sound power shall exceed the following levels at an inlet pressure of 1.0” w.g.:
Octave Band: 2 3 4 5 6 7

Radiated Pwl ,dB: 74 71 67 68 67 64

Discharge Pwl ,dB: 79 78 82 90 87 65

(11) Rooftop Air Conditioners 6 Ton and Smaller

A. Rooftop Air Conditioners shall be manufactured by The Trane 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. Description: Factory assembled and tested; designed for exterior installation;

consisting of compressor, indoor and outside refrigerant coils, indoor fan and

outside coil fan, refrigeration and temperature controls, filters and dampers.

D. Casing: Galvanized-steel construction with enamel paint finish, removable

panels or access doors with neoprene gaskets for inspection and access to

internal parts, minimum ½-inch-thick thermal insulation, knockouts for

electrical and piping connections, exterior condensate drain connection, and

lifting lugs.

E. Indoor Fan: Forward curved, centrifugal, belt driven by single motor.

F. Outside Coil Fan: Propeller type, directly driven by motor.

G. Refrigerant Coils: Aluminum-plate fin and seamless copper tube in steel

casing with equalizing-type vertical distributor.

H. Compressor: Hermetic scroll compressor with integral vibration isolators,

internal over current and over temperature protection, internal pressure relief,

and crankcase heater.

I. Refrigeration System:

1. Compressor.

2. Outside coil and fan.

3. Indoor coil and fan.

4. Expansion valve with replaceable thermostatic element.

5. Refrigerant Dryer.

6. High-pressure switch.

7. Low-pressure switch.

8. Thermostat for coil freeze-up protection during low-ambient temperature operation or loss of air.

9. Low-ambient switch.

10. Brass service valves installed in discharge and liquid lines.

11. Charge of refrigerant.
J. Filters: 2-inch thick, pleated, throwaway filters in filter rack.

K. Heat Exchanger: Aluminized-steel construction for natural-gas fired burners

with the following controls:

1. Redundant single or dual gas valve with manual shutoff.

2. Direct-spark pilot ignition.

3. Electronic flame sensor.

4. Induced-draft blower.

5. Flame rollout switch.

filter, and hood.

1. Damper Motor: Fully modulating spring return with adjustable minimum position.

2. Control: Electronic-control system uses outside-air temperature to adjust mixing dampers.

3. Relief Damper: Gravity actuated with bird screen and hood.
M. Power Connection: Provide for single connection of power to unit with unit

mounted disconnect switch accessible from outside unit and control-circuit

transformer with built-in circuit breaker.
N. Unit Controls: Solid-state control board and components contain at least the

following features:

1. Indoor fan on/ff delay.

2. Default control to ensure proper operation after power interruption.

3. Service relay output.

4. Unit diagnostics and diagnostic code storage.

5. Field-adjustable control parameters.

6. Defrost control.

7. Economizer control.

8. Gas valve delay between first- and second-stage firing.

9. Low-ambient control, allowing operation down to 0 deg F.

10. Minimum run time.

11. Night setback mode.

12. Return-air temperature limit.

13. Smoke alarm with smoke detector installed in return air.

14. Low-refrigerant pressure control.

1. Service Outlets: Two, 115-V, ground-fault, circuit-interrupter type.

2. Condensate drain trap.

3. Hail guards of steel, painted to match casing.

A. Rooftop Air Conditioners shall be manufactured by The Trane 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 specifications (including but not limited to all performance criteria, efficiencies and warranties) are waived.

C. Description: Factory assembled and tested; designed for exterior installation; consisting of compressor, indoor and outside refrigerant coils, indoor fan and outside coil fan, refrigeration and temperature controls, filters and dampers.

D. Casing: Galvanized-steel construction with enamel paint finish, removable panels or access doors with neoprene gaskets for inspection and access to internal parts, minimum 1/2-inch-thick thermal insulation, knockouts for electrical and piping connections, exterior condensate drain connection, and lifting lugs.

E. Indoor Fan: Forward curved, centrifugal, belt driven with adjustable motor

sheaves, grease-lubricated ball bearings, and motor.

F. Outside Coil Fan: Propeller type, directly driven by permanently lubricated

motor.

H. Compressor(s): Number as scheduled hermetic scroll compressors with integral vibration isolators, internal overcurrent and overtemperature protection, internal pressure relief, and crankcase heater(s).

I. Refrigeration System:

1. Compressor(s).

2. Outside coil and fan.

3. Indoor coil and fan.

4. Check valves.

5. Expansion valves with replaceable thermostatic elements.

6. Refrigerant dryers.

7. High-pressure switches.

8. Low-pressure switches.

9. Thermostats for coil freeze-up protection during low-ambient temperature operation or loss of air.

10. Independent refrigerant circuits.

11. Brass service valves installed in discharge and liquid lines.

12. Charge of refrigerant.

13. Hot-Gas Bypass: Factory-installed valve.

14. Timed Off Control: Automatic-reset control shuts compressor off after

five minutes.

J. Filters: 2-inch thick, fiberglass, pleated, throwaway filters in filter rack.

K. Heat Exchanger: Aluminized-steel construction for natural-gas-fired burners with the following controls:

1. Redundant dual gas valve with manual shutoff.

2. Direct-spark pilot ignition.

3. Electronic flame sensor.

4. Induced-draft blower.

5. Flame rollout switch.

L. Economizer: Return- and outside-air dampers with neoprene seals, outside-air filter and hood.

position.

2. Control: Electronic-control system uses outside-air temperature to adjust mixing dampers.

3. Relief Damper: Gravity actuated with bird screen and hood.

M. Power Connection: Provide for single connection of power to unit-mounted disconnect switch accessible from outside unit and control-circuit transformer with built-in circuit breaker.

N. Unit Controls: Solid-state control board and components contain at least the following features:

1. Indoor fan on/ff delay.

2. Default control to ensure proper operation after power interruption.

3. Service relay output.

4. Unit diagnostics and diagnostic code storage.

5. Field-adjustable control parameters.

6. Defrost control.

7. Economizer control.

8. Gas valve delay between first- and second-stage firing.

9. Indoor-air quality control with carbon dioxide sensor.

10. Low-ambient control, allowing operation down to 0 deg F.

11. Minimum run time.

12. Night setback mode.

13. Return-air temperature limit.

14. Smoke alarm with smoke detector installed in return air.

15. Low-refrigerant pressure control.
O. DDC: Install stand-alone control module providing link between unit controls and DDC temperature-controlled system. Control module shall be compatible and function with temperature-control system specified in Division 15 Section “HVAC Instrumentations and Controls.”

P. Accessories:

1. Service Outlets: Two, 115-V, ground-fault, circuit-interrupter type.

2. PVC Condensate drain trap.

3. Hail guards of steel, painted to match casing.
Q. Roof Curb: Steel with corrosion-protection coating, gasketing, and factory-installed wood nailer; complying with NRCA standards; minimum height of 14 inches.

(13) Rooftop Air Conditioners 30 Tons and Larger

A. Rooftop Air Conditioners shall be manufactured by The Trane 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 specifications (including but not limited to all performance criteria, efficiencies and warranties) are waived.

C. General: Units shall be specifically designed for outdoor rooftop installation on a roof curb and be completely factory assembled and texted, piped, internally wired, fully charged with R-22, compressor oil and shipped in one piece. Units shall be available for direct expansion cooling with natural gas. Filters, outside air system, exhaust air system, optional non-fused disconnect switches and all operating and safety controls shall be furnished factory installed. All units shall be UL approved and factory run tested. Cooling capacity shall be rated in accordance with ARI Standard 360. All units shall be printed on long life water resistant material and shall ship attached to control panel doors.

D. Casing: Exterior panels shall be zinc coated galvanized steel, phosphatized and painted with and air-dry finish durable enough to withstand a minimum of 500 hours consecutive salt spray application in accordance with standard ASTM B117. Screws shall be coated with zinc-plus-zinc chromate. Double Wall Construction hinged access doors shall provide access to filters, return/exhaust air, heating and supply fan section. All access doors and panels shall have neoprene gaskets. Interior surfaces or exterior casing members shall have 1/2 inch Tuf-Skin® fiberglass insulation. Unit base shall be watertight with heavy gauge formed load bearing members, formed recess and curb overhang. Unit lifting lugs shall accept chains or cables for rigging. Lifting lugs shall also serve as unit tie down points.

E. Refrigeration System

1. Compressors: Trane 3-D™ Scroll compressors have a simple mechanical design with only three major parts. Scroll type compression provides inherently low vibration. The 3–D Scroll provides a completely enclosed compression chamber which leads to increased efficiency. Exhaustive testing on the 3-D Scroll, including start up with shell full of liquid, has proven that slugging does not fail involutes. Direct-drive, 3600 rpm, suction gas-cooled hermetic motor. Trane 3–D Scroll compressor includes centrifugal oil pump, oil level sightglass and oil charging valve. Each compressor shall have crankcase heaters installed, properly sized to minimize the amount of liquid refrigerant present in the oil sump during off cycles. Discharge and liquid line service valves are standard on each refrigerant circuit.

2. Evaporator Coil: Internally enhanced copper tubing 1/2 –inch O.D. shall be mechanically bonded to heavy-duty aluminum fins of configurated design. All coils shall be equipped with thermal expansion valves and factory pressure and leak tested at 300 psi.

3. Condenser Coil: Configurated aluminum fin or configurated copper fin secondary surface shall be mechanically bonded to primary surface of 3/8-inch O.D. copper tubing for extra corrosion resistance. Subcooling circuit(s) shall be provided as standard. All coils shall be factory tested at 450 psig air pressure and vacuum dehydrated.

4. Condenser Fans and Motors: All condenser fans shall be vertical discharge, direct drive fans, statically balanced, with steel blades and zinc plated steel hubs. Condenser fan motors shall be three-phase motors with permanently lubricated ball bearings, built-in current and thermal overload protection and weather tight slingers over motor bearings

F. Air Handling System: Supply Fan: All supply fans shall have two double inlet

forward-curved fans mounted on a common shaft with fixed sheave drive and shall be dynamically balanced tested in factory. Supply fan shall be test run in unit as part of unit test and unit shall reach rated rpm before the fan shaft passes through first critical speed. Fan shaft shall be mounted on two grease lubricated ball bearings designed for 200,000 hours average life. Optional extended grease lines shall allow greasing of bearings from unit filter section. Fan motor and fan assembly shall be mounted on common base to allow consistent belt tension with no relative motion between fan and motor shafts. Entire assembly shall be completely isolated from unit and fan board by double deflection rubber-in shear isolators, or by optional two-inch deflection spring isolation. All supply fan motors meet U.S. Energy Policy Act of 1992 (EPACT).

G. Unit Controls: Solid-state control board and components contain at least the following features:

1. Indoor fan on/off delay.

2. Default control to ensure proper operation after power interruption.

3. Service relay output.

4. Unit diagnostics and diagnostic code storage.

5. Field-adjustable control parameters.

6. Defrost control.

7. Economizer control.

8. Gas valve delay between first- and second-stage firing.

9. Indoor-air quality control with carbon dioxide sensor.

10. Low-ambient control, allowing operation

11. Minimum run time.

12. Night setback mode.

13. Return-air temperature limit.

14. Smoke alarm with a smoke detector installed in return air.

15. Low-refrigerant pressure control.

H. DDC Temperature Control: Install stand-alone control module providing link between unit controls and DDC temperature-control system. Control module shall be compatible and function with temperature-control system specified in Division 15 Section “HVAC Instrumentation and Controls.”

I. Filters:

1. General: Filter options shall mount integral within unit and be accessible by hinged access panels.

2. Filters shall be two-inch high efficiency medial filters with average dust spot efficiency of 25-35 percent and an average arrestance in excess of 90 percent when tested in accordance with ASHRAE 52-76.

J Exhaust Air: Modulating 100 percent exhaust air fan option: Two, double-inlet, forward-curved fans shall be mounted on a common shaft with fixed sheave drive. All fans shall be dynamically balanced and tested in factory before being installed in unit. Exhaust fan shall be test run in unit as part of unit test. Unit shall reach rated rpm before fan shaft passes through first critical speed. Fan shaft shall be mounted on two grease lubricated ball bearings designed for 200,000-hour average life. Optional extended grease lines shall be provided to allow greasing of bearings from unit filter section. Fan motor and assembly shall be mounted on common base to allow consistent belt tension with no relative motion between fan and motor shaft. On motor sizes larger than five hp entire assembly shall be completely isolated from unit and fan board by double deflection, rubber in shear isolators or spring isolation. Discharge dampers at unit shall modulate exhaust airflow in response to OA damper position. All exhaust fan motors meet the U.S. Energy Policy Act of 1992 (EPACT).

K. Outside Air: 0-100 percent modulating economizer: Operated through the primary temperature controls to automatically utilize OA for “free” cooling. Automatically modulated return and OA dampers shall maintain proper temperature in the conditioned space. Economizer shall be equipped with an automatic lockout when the outdoor high ambient temperature is too high for proper cooling. Minimum position control shall be standard and adjustable at the Human Interface Panel or with a remote potentiometer or through the building management system. A spring return motor shall ensure closure of OA dampers during unit shutdown or power interruption. Mechanical cooling shall be available to air economizer mode at any ambient. Low leak economizer dampers shall be standard with leakage rate of 2.5% of nominal airflow (400 CFM/ton) at 1 inch wg. Static pressure.

L. Gas-Fired Heating System: All gas-fired units shall be completely assembled and have a wired gas fired heating system integral within unit. Units shall be UL or CSA approved specifically for outdoor applications downstream from refrigerant cooling coils. All gas piping shall be threaded connection with a pipe cap provided. Gas supply connection shall be provided through the side or bottom of unit. All units shall be fire tested prior to shipment. Heat exchanger shall be tubular two pass design with stainless steel primary and secondary surfaces. Free floating design shall eliminate expansion and contraction stresses and noises. Gasketed cleanout play shall be provided for cleaning of tubes/ turbulators. • Heat exchanger shall be factory pressure and leak tested.

1. Burner shall be a stainless steel industrial type with an air proving switch to prevent burner operation if the burner is open for maintenance or inspection. Ceramic cone shall be provided to shape the flame to prevent impingement on sides of heat exchanger drum. Burner assembly shall house ignition and monitoring electrode.

2. Combustion Blower shall be centrifugal type fan to provide air required for combustion. Fan motor shall have built-in thermal overload protection.

3. Gas Safety Controls shall include electronic flame safety controls to require proving of combustion air prior to ignition sequence which shall include a 60 second pre-purge cycle. Direct spark ignition shall be provided on 235 and 350 MBh heat exchangers and pilot ignition shall be provided on 500, 850 and 1000 MBh heat exchanger units. Sixty second delay shall be provided between first and second stage gas valve operation on two-stage heaters. Continuous electronic flame supervision shall be provided as standard. • Full Modulation Gas Heaters shall be made from grades of stainless steel suitable for condensing situations. The heater shall have a turn down ration of at least 4 to 1.

4. Limited Modulation Gas Heaters shall have a minimum turn down ratio of at least 3 to 1.

M. Roof Mounting Curb: Roof mounting curb shall be heavy gauge zinc coated steel with nominal two-inch by four-inch nailer setup. Supply/return air opening gasketing shall be provided. Curb shall ship knocked down for easy assembly. Channel shall be provided to allow for adjustments of return air opening location. Curb shall be manufactured to National Roofing Contractors Association guidelines.

A. Description: ERV unit is an outdoor rooftop mounted, electrically controlled outdoor air pre-conditioner utilizing an Airxchange Energy Recovery Cassette to reduce the heating and cooling load placed on the HVAC unit by untreated outdoor air. Exhaust air shall be introduced to the ERV unit through a transition connected to the HVAC unit, which utilizes either a horizontal or vertical return. Supply air will be introduced to the HVAC unit through the HVAC economizer opening.

B. Quality Assurance:

1. Unit shall be designed in accordance with UL Standard 1995.

2. Unit shall be ETL tested and certified.

3. Roof curb shall be designed to conform to NRCA Standards.

4. Insulation and adhesive shall meet NFPA 90A requirements for flame spread and smoke generation.

5. Unit casing shall be capable of withstanding Federal Test Method Standard No. 141 (Method 6061) 500-hour salt spray test.

C. General: the ERV unit shall be a factory assembled, single piece unit. Contained within the unit enclosure shall be all factory wiring with a single, pre-determined point of power input and a single point of 24 volt control wiring.

D. Unit Cabinet:

1. Unit cabinet shall be constructed of galvanized steel coated with a pre-painted baked enamel finish.

2. The pre-conditioned area of the exhaust air stream and post-conditioned area of the supply air stream shall be insulated with a 1 inch, 2 pound density foiled faced insulation. Insulation contained within a double walled panel, with equivalent R values may be substituted.

3. Cabinet panels shall be hinged (except on AA cabinet).

4. Exhaust and supply air streams shall have back-draft dampers to prevent air penetration during off cycles.

5. Holes shall be provided in the base rails for rigging shackles to facilitate overhead rigging.

E. Blowers:

1. Blower shall be belt driven. Belt shall include an adjustable pulley (direct-drive motors on AA cabinet).

2. Blower wheel shall be made from steel with a corrosion resistant finish (except for AA cabinet). It shall be a dynamically balanced, double-inlet type with forward-curved blades.

F. Filter Section:

1. Standard filter section shall consist of commercially available, 2 inch pleated filters.

G. Controls and Safeties:

1. Control box power out must be interrupted when the access panel is opened.

2. ERV unit shall operate in conjunction with HVAC unit fan. Factory wire plug will be provided.

3. Space controlled, 24 colt output signal, must ne provided for stand alone units (optional).

4. Frost protection to prevent supply motor overload.

5. Motorized Dampers – out air and exhaust air.

6. Wheel by-pass switch based upon outside air enthalpy. Include stop / jog control.

H. Electrical Requirements:

1. All unit power wiring shall enter unit cabinet at a single location.

I. Energy Recovery Cassette:

1. The energy recovery media (lightweight polymer) shall be a nominal 70% effective. Effectiveness ratings shall be ARI 1060 certified.

2. The wheel must have desiccant permanently integrated into the media of the wheel.

3. The energy recovery cassette shall be an UL Recognized component for electrical and fire safety.

J. Special Features:

1. Roof curb: Formed of heavy gauge galvanized steel with wood nailer strip and shall be capable of supporting entire unit weight.

2. Transition Option: ERV unit has a specially designed transition to mate the ERV unit with the HVAC unit. Transition must be ordered with the ERV unit.

3. Fused Disconnect Switch: For 480 Volt power, a 30 amp, 600 volt, 3 pole, NEMA3R fused disconnect switch shall be factory installed.

4. Frost Protection:

a. frost protection module shall sense pressure differential across the energy recovery cassette.

b. Supply blower must be shut-off if the pressure differential across the energy recovery cassette exceeds a factory set point. Blower will remain off for an adjustable period of time.

c. Exhaust blower and wheel shall remain in operation in order to remove any frost build-up on the wheel.

5. Wheel By-pass Option with Stop Jog Control– Air sensor used to prevent the wheel from rotating if the outside air enthalpy is acceptable for free cooling. Both exhaust and supply blowers will remain on. Wheel is periodically activated to expel contaminants,

6. Motorized Outside Air Damper – The outside air dampers are motorized with 24 volt motors.

7. Motorized Exhaust Damper – The exhaust dampers are motorized with24 volt motors.

(15) Make-Up Air Handling Unit

A. Make-up air handling units shall be manufactured by Greenheck.

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: Performance to be as scheduled on plans. Make-up air units shall be ETL listed to ANSI Z83.4

D. Gas Train and Controls: Direct fired gas system shall have a draw through design and field adjustable burner baffles. Gas trains shall include a direct spark ignition system and shall have digital coded fault indicator capability. Fault indicator shall provide service history by storing codes for the last five faults. Dual safety shutoff valves shall be industrial duty and use 120 VAC control signals. Temperature control shall incorporate a Maxitrol electronic modulation control system.

E. Unit Casing and Frames: Unit shall be of internal frame type construction of galvanized steel. All frames and panels shall be G90 galvanized steel. Where top panels are joined there shall be a standing seam to insure positive weather protection. All metal-to-metal surfaces exposed to the weather shall be sealed. All components shall be easily accessible through removable or hinged doors.

F. Insulation: Unit casing to be lined with 1 inch fiberglass insulation. Insulation in accordance with NFPA 90A and tested to meet UL 181 erosion requirements and secured to unit with waterproof adhesive and permanent mechanical fasteners.

G. Fan Section: Centrifugal fans shall be doubled width, double inlet and forward curved. Fan and motor shall be mounted on a common base and shall be internally isolated. All blower wheels shall be statically and dynamically balanced. Ground and polished steel fan shafts shall be mounted in permanently lubricated ball bearings. Bearings shall be selected for a minimum (L10) life in excess of 100,000 hours at maximum cataloged speeds.

H. Motors and Drives: Motors shall be energy efficient, complying with EPACT standards for single speed OPD and TE enclosures. Motors shall be permanently lubricated, heavy duty type, matched to the fan load and furnished ay the specific voltage, phase and enclosure. The motors shall be factory wired to a factory supplied disconnect switch. Drives shall be sized for a minimum of 150% of driven horsepower. Pulleys shall be cast and have machined surfaces, 15 horse power and less shall be supplied with an adjustable drive pulley.

I. Electrical: All internal electrical components shall be prewired for single point power connection. All electrical components shall be UL listed, recognized or classified where applicable and wired in compliance with the National Electrical Code. Control center shall include motor starter, control circuit fusing, control transformer for 24 VAC circuit and integral door interlocking disconnect switch. Contractors, Class 20 adjustable overload protection and single protection shall be standard.

J. V-Bank Filter Section: Filters shall be mounted in a V-bank arrangement such that velocities across the filters do no exceed 350 feet per minute. Filters shall be easily accessible through a removable access panel.

K. Evaporate Cooling Section: The evaporate cooling section includes a galvanized steel housing with a louvered intake, 2 inch aluminum mesh filter and a stainless steel evaporative cooling module. The evaporative cooling media is Munters GLASdek and has a depth of 12 inches for 90% cooling effectiveness. The entire section mounts directly to the front of the DG unit, eliminating transition or ductwork. Drain and overflow shall be trapped through the side of the cooling section. The evaporative cooling section shall be provided with freeze protection, automatic drain and fill and the Water Wizard evaporative optimizer.

A. Computer room air conditioning units shall be by Liebert.

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

C. Summary: The system shall be designed to maintain temperature and relative humidity conditions within the room. The manufacturer shall design and furnish all equipment to be full compatible with heat dissipation requirements of the site.

D. Cabinet and Frame Construction

1. The frame shall be constructed of MIG welded tubular and formed steel. All frame components shall be finished in a black, powder-coat finish to protect against corrosion. The exterior panels shall be 20 gauge steel and shall be powder coated with Z-0430 color paint. The panels shall be insulated with a minimum 1 inch, 1-1/2 lbs. density fiber insulation. Front and side panels shall have captive, 1/4 turn fasteners.

2. The cabinet shall be designed so that all components are serviceable and removable from the front of the unit.

E. Fan and Motor Section

1. The fan shall be the centrifugal type, double width, double inlet. The shaft shall be heavy duty steel with self-aligning ball bearings with minimum life span of 100,000 hours.

2. The fan motors shall be 1750 ROM and mounted on an adjustable base. The drive package shall be sized for 200% of the fan motor horsepower, and equipped with an adjustable motor pulley. The fan/motor assembly shall be mounted on vibration isolators. The fan shall be located to draw air over the coil to ensure even air distribution and maximum coil performance.

F. Filter: The filter shall be 2 inches thick and rated not less than 30%

efficiency based on ASHRAE 52.1.

G. Advanced Microprocessor Control

1. The Advanced control processor shall be microprocessor based with a front monitor LCD display panel and control keys for user inputs. The controls shall be menu driven with on-screen prompts for easy user operation. The system shall allow user review and programming of temperature setpoints, alarm parameters, and setup selections including choice of control type. A password shall be required to make system changes. For all user selections, the range of acceptable input (temperature, humidity, or time delay) shall be displayed on the monitor screen. The system shall provide monitoring of room conditions, operational status in % of each function, component run times, date and time, and four analog inputs from sensors provided by other.

2. Control: The control system shall allow programming of the following room conditions:

a. Temperature Setpoint 65 to 85º F.

b. Temperature Sensitivity +1 to +9.9º F.

c. All setpoints shall be adjustable from the individual unit front monitor panel. The microprocessor can be set within these ranges, however, the unit may not be able to control to extreme combinations of temperature and humidity.

d. Temperature Sensors shall be capable of being calibrated using the front monitor panel controls to coordinate with other temperature and humidity sensors in the room.

3. Compressor Short-Cycle Control: The control system shall include a program to prevent compressor short-cycling.

4. System Auto-Restart: For start-up after power failure, the system shall provide automatic restart with a programmable (up to 9.9 minutes in 6-second increments) time delay. Programming can be performed either at the unit or from the central site monitoring system.

5. Sequential Load Activation: During start-up, or after power failure, the microprocessor shall sequence operational load activation to minimize inrush current. Systems allowing multiple loads to start simultaneously are unacceptable.

6. Front Monitor Display Panel: The microprocessor shall provide a front monitor LCD backlit display panel with 4 rows of 20 characters with adjustable contrast. This display (along with five front mounted control keys) shall be the only operator interface required to obtain all available system information such as room conditions, operational status, alarms, control and alarm setpoints, and all user selections including alarm delays, sensor calibration, DIP switch selections, and diagnostics. All indicators shall be in language form. No symbols or codes shall be acceptable.

7. Alarms: The microprocessor shall activate an audible and visual alarm in event of any of the following conditions:

a. High temperature

b. Low temperature

c. High Humidity

d. Low Humidity

e. Short Cycle

f. Compressor Overload

g. Main Fan Overload

h. High Head Pressure

i. Change Filter

j. Loss of Air Flow

k. Low Suction Pressure

l. Loss of Power

m. Custom Alarm (#1 to #4)

n. Custom alarms are four customer accessible alarm inputs to be indicated on the front panel. Custom alarms can be identified with prepared (programmed) alarm labels for the following frequently used inputs:

1) Water Under Floor

2) Smoke Detected

3) Standby GC Pump On

4) Loss of Water Flow

5) Standby Unit On

o. User customized text can be entered for two of the four custom alarms. Each alarm (unit and custom) can be separately enabled or disabled, selected to activate the common alarm, and programmed for a time delay of 0 to 255 seconds.

8. Audible Alarm: The audible alarm shall annunciate any alarm that is enabled by the operator.

9. Common Alarm: A programmable common alarm shall be provided to interface user selected alarms with a remote.

10. Remote Monitoring: All alarms shall be communicated to the Liebert monitoring system with the following information: date and time of occurrence, unit number, and present temperature and humidity.
Note: Alarms may be transmitted off site via BMS or security system. Provide interface, coordinate and wire for proper operation.
11. Analog Inputs: The system shall include four customer accessible analog inputs for sensors provided by others. The analog inputs shall accept a 4 to 29 mA signal. The user shall be able to change the input to 0 to 5 VDC or 0 to 10 VDC if desired. The gains for each analog input shall be programmable from the front panel. The analog inputs shall be able to be monitored from the front panel.

12. Diagnostics: The control system and electronic circuitry shall be provided with self-diagnostics to air in troubleshooting. The microcontroller board shall be diagnosed and reported as pass/not pass. Control inputs shall be indicated as on or off from the front monitor panel without using jumpers or a service terminal. Each control output shall be indicated by an LED on a circuit board.

13. Date Collection: The control system shall maintain accumulative operating hours of compressor, fan motor, and Econ-O-Coil. The ten most recent alarms shall also be retained.

14. Communication: A network interface card shall be included capable of communication with the installed building management system (BMS).

H. Floor Stand: The floor stand shall be constructed of a heliarc-welded tubular steel frame. The floor stand shall be coated using an autodeposition process to protect against corrosion. The floor stand shall have adjustable legs with vibration isolation pads. The floor stand shall be: 9 inches high.

I. Disconnect Switch, Locking Type: The manual disconnect switch shall be mounted in the high voltage section of the electrical panel. The switch shall be accessible from the outside of the unit with the door closed, and prevent access to the high voltage electrical components unit switched to the “OFF” position.

J. Smoke Detector: The smoke detector senses the return air, shuts down the unit upon detection, and sends visual and audible alarm. Dry contacts are available for a remote customer alarm. This smoke detector is not intended to function as or replace any room smoke detection system that may be required by local or national codes.

K. Condensate Pump: The condensate pump shall be complete with dual integral float switch, pump, motor assembly, and reservoir.

L. GLYCOOL Self-Contained Systems:

1. GLYCOOL Coil: The GLYCOOL coil shall be constructed of copper tubes and aluminum fins and be located upstream of the evaporator coil. The GLYCOOL coil shall be designed for closed-loop applications using properly treated glycol solutions. The coil shall be rated at 48,300 BTU/HR sensible cooling capacity with a 45 º F entering glycol solution temperature.

2. 3-Way GLYCOOL Valve: The GLYCOOL coil shall be equipped with a fully proportional 3-way control valve. This motorized control valve shall control the amount of flow to the GLYCOOL coil and maintain constant temperature and relative humidity.

3. Glycol Condenser: The glycol system shall be equipped with a coaxial condenser for use with 40% ethylene glycol mixture.

4. Design Pressure: The GLYCOOL coil/condenser circuit shall be designed for a pressure of 150 PSI.

5. Comparator Circuit: The system shall be equipped with a microprocessor controlled comparator sensor that permits free-cooling operation whenever entering glycol temperature is below return-air temperature.

6. Propellers Fan Drycooler: The Liebert manufactured drycooler shall be low profiled, slow speed, direct drive propeller fan type. The drycooler shall be constructed of aluminum and contain a copper tube aluminum fin coil with an integral electric control panel. The drycooler shall be designed for 105º F ambient.

7. Single Glycol Pump Package: This system shall be provided with a centrifugal pump mounted in a weatherproof and vented enclosure. The pump shall be rated for 1.5 hp and operate on 460 Volt, 3 phase, 60 Hz.

(17) Electric Unit Heater: Size, capacities, features, and manufactures as required.

(18) Fans:

A. General Requirements for All Fans

1. Provide fans of size, type, and capacity (to be determined) or approved equal. All fans constructed to AMCA Standards, AMCA listed and labeled, and UL listed and labeled.

2. Balance fans statically and dynamically at factory.

3. Factory paint fan housing, fan wheel (except aluminum), frame and support bracket with premium epoxy finish at factory after properly preparing surfaces. Finish fan curb and roof flashing to match. Color as selected by Architect.

4. Arrange fans to be cleanable and so that wheel, bearings, shaft and drive are removable. Provide plug type clean out doors or split fan housing. Gasket joints and bolt airtight.

5. Provide vibration isolation for all fans.

6. Assemble fans at factory, and test with permanent motor for proper operation, alignment, and balance.

7. Provide accessory roof curbs and/or roof caps as recommended by the fan manufacturer.

8. Provide bird screens with all exterior fans

B. In-line Centrifugal Fan

Ceiling-mounted or duct-mounted exhaust fans shall be of the centrifugal direct-drive type. The fan housing shall be constructed of galvanized steel with pre-punched mounting brackets. The housing interior shall be lined with ½” acoustical insulation. The outlet duct collar shall include an aluminum back-draft damper and shall be adaptable for horizontal or vertical discharge. The access for wiring shall be external. The motor disconnect shall be integral. The motor shall be mounted on vibration isolators. The motor shall be thermally protected. The fan wheel(s) shall be of the forward curved centrifugal type, constructed of galvanized steel and dynamically balanced. Fans shall bear the AMCA Certified Ratings Seals for sound and air performance and shall be UL Listed. Provide with flexible fabric duct connectors and vibration hangers.

C. Roof and Wall Exhausters

1. Roof exhaust fans shall be centrifugal type. The fan wheels shall be centrifugal backward inclined, constructed of aluminum and shall include a wheel cone carefully matched to the inlet cone for precise running tolerances. Wheels shall bee statically and dynamically balanced. The fan housing and shroud shall be constructed of heavy-gauge aluminum with a rigid internal support structure. Windbands shall have a rolled bead for added strength and shall be joined to curbcaps with a welded seam. Motors shall be heavy-duty ball-bearing type, carefully matched to the fan load, and furnished at the specified voltage, phase and enclosure. Fractional horsepower motors shall have integral motor overload protection and disconnecting means. Fresh air for motor cooling shall be drawn into the motor compartment form an area free of discharge contaminants. Motors shall be readily accessible for maintenance. Fans shall have a motorized damper at inlet interlocked to open when fan operates/close when fan stops, where scheduled. Each fan shall bear a permanently affixed manufacturer’s nameplate containing the model number and individual serial be listed as a power roof ventilator for restaurant cooking appliances with grease trap. Fans shall have hinged base for ease of maintenance.

a. Belt-Driven Type: Motors and drives shall be mounted on vibration isolator out of the airstream. Drive frame assemblies shall be constructed of heavy-gauge steel and mounted on vibration isolators.

Precision ground and polished fan shafts shall be mounted in permanently sealed, lubricated pillow block ball bearings. Bearings shall be selected for a minimum (L50) life in excess of 200,000 hours at maximum cataloged operating speed. Drives shall be sized for a minimum of 150% of driven horsepower.

Pulleys shall be of the fully machined cast-iron type, keyed and securely attached to the wheel and motor shafts.

Motor pulleys shall be adjustable for final system balancing. A disconnect switch shall be factory installed and wired from the fan motor to a junction box installed within the motor compartment. A conduit chase shall be provided through the curb cap to the motor compartment for ease of electrical wiring.
b. Direct-Driven Type: Motors shall be mounted on vibration isolators out of the airstream.

(19) Variable frequency Drives for pumps, MZ and AHU unit. Supply, return, exhaust fans, and heat recovery units, variable frequency drive, AC Tech MCH or Graham VLT Series 6000, or approved equal. Provide with (3) contractor bypass enclosure (drive, off, line, capable of operation with the drive removed for repair), motor starter, integral 3% impedance DC link reactors and accessories. Provide start-up services for variable frequency drive. Submit integral 3” impedance DC link reactors start-up report and provide support for testing, adjusting and balancing, and Owner training (4 hours). VFD bypass shall have an integral lockable main fused disconnect and low/over voltage and protection. Provide 36-month written warranty for labor, materials and drive equipment.

(20) Water-Wash Exhaust Hood (Elementary) (Secondary and High School to be determined)

A. Acceptable Manufacturers:

1. Gaylord industries, Inc., Model CG, custom air, with options as specified, or approved equal, as required. Exhaust fan to be stored at 125% of hood requirement.

B. Island Hood shall be as required and mounted as shown on Architectural drawings.

C. General: Water-wash exhaust hood with exhaust damper shall be a high-velocity type grease extractor with an air inlet opening above and parallel to the cooking surface. Each ventilator to utilize four full-length horizontal self-draining baffles for centrifugal grease extraction. There will be one baffle located at the inlet of the extraction chamber which will be a grease extracting baffle in its open position and a fire damper baffle when closed. Baffle to close in the direction of airflow. Main grease gutter to have 1-1/2” pitch to drain opening with pre-flush drain line. Centrifugal grease extraction efficiency of up to 95% when operated at design conditions o be accomplished without the use of filters, cartridges, or constant running water. Ventilator to operate at air quantities as shown on plans. Provide stainless steel, flashing panels between hood and ceiling, continuous around hood perimeter.

D. Construction: The ventilator and flashing panels shall be of all stainless steel construction, not less than 18 gauge, type 304. All exposed surfaces shall be a No. 4 finish.

E. Accessibility and Inspection: Full-length non-gasket hinged inspection doors shall be provided so that service can be performed on all interior parts without removing any panels, dampers, or baffles

F. Automatic Wash Down System: Ventilator to be equipped with two full-length wash pipes for automatic detergent injected cleaning utilizing 140 degree F hot water. Components for cleaning and fire protection system shall be housed in a combination QUENCHER cabinet and ventilator control cabinet. Provide with cabinet “RP” backflow preventer meeting Washington State requirements. Include connection and testing.

G. Internal Fire Protection: Ventilator shall be equipped with an internal QUENCHER fire protection system. Pulling the fire switch on the control cabinet shall turn on water spray in the extraction chamber. The fire damper shall stay open and the exhaust fan remains on. When activated, 350 degrees F thermostats located at the duct collar shall automatically close the spring loaded fire damper, turn on water spray, and shut off the exhaust fan.

H. Plumbing/Electrical: Ventilator and combination control cabinet shall be factory pre-plumbed and pre-wired to a single connection point.

I. Lights: Full length sealed fluorescent light fixtures.

J. Approvals: Ventilator to be listed or recognized by IBCO, NSF, UL, and in accordance with all recommendations of NFPA Standard #96. Each ventilator must meet all applicable codes.

(21) Dishwasher Exhaust Hood (Elementary, Secondary) (High School to be determined)

A. Gaylord, 18 ga 304 stainless, 4 finish, no perimeter gutter, NSP standard No. 2 size or as required, or approved equal. Exhaust fan to be sized at 125% of hood requirement.

(22) Ductless Cooling/Heating Units

A. Outdoor-mounted, air cooled split system. Outdoor section suitable for on the ground, rooftop, balcony, or under-deck installation. Unit shall consist of a hermetic compressor, an air-cooled coil, propeller-type draw-through outdoor fan, full refrigerant charge, and control box. Unit shall discharge air horizontally. Units shall function as the outdoor component of an air-to-air cooling system.

B. Indoor direct expansion fan coil that can be, console or under-ceiling mounted. Fan coil shall be shipped complete with heat exchanger coil, fan, fan motor, piping connector, electrical controls, infrared remote control system, wall and ceiling mounting brackets. Fan shall be centrifugal blower type with air intake in the bottom of the unit and discharge in the front. Automatic, motor-driven vertical air sweep shall be provided standard.

C. Quality Assurance

1. Unit construction shall comply with ANSI/ASHRAE 15, latest revision, and with the NEC.

2. Unit shall be rated with the matching outdoor unit per ARI Standards 210/240.

3. Units shall be constructed in accordance with UL Standards.

4. Unit cabinet shall be capable of withstanding 500-hour salt spray test.

5. Air-cooled condenser coils shall be leak tested at 350-psig.

D. Delivery, Storage and Handling:

1. Units shall be stored and handled per unit manufacturer’s recommendations.

E. Warranty:

1. One-year parts, 5-year compressor limited warranty.

F. Unit Cabinet: Outdoor cabinet shall be zinc-coated steel finished with baked enamel paint. Inlet grilles shall be attractively styled. Indoor cabinet is made up of high impact plastic. Mounting brackets for either floor or ceiling installation shall be provided.

G. Coils: Coils shall be copper tube with aluminum fins and galvanized steel tube sheets. Fins shall be bonded to the tubes by mechanical expansion. A drain pan under the coil will have a drain hose connection to remove condensate. The units use a capillary tube-metering device in the outdoor unit.

H. Motors/Fans:

1. Motors shall be permanently lubricated with inherent overload protection.

2. Indoor fan motors are 3-speed. Outdoor fans with be direct-drive, propeller type, and will discharge air horizontally. Fans will-draw air across the outdoor coil.

3. Outdoor fan motors are totally enclosed; single-phase motors with class B insulation.

4. Motor shafts will have inherent corrosion resistance.

5. Fan blades are corrosion resistant and are statically and dynamically balanced.

I. Compressor:

1. Compressor shall be fully hermetic reciprocation type.

2. Compressor shall be equipped with oil system, operating oil charge and motor. Internal overloads shall protect the compressor from over temperature and overcurrent.

3. Motor shall be NEMA rated class F, suitable for operation in a refrigerant atmosphere.

4. Reciprocating compressors on Heat Pump units shall be equipped with crankcase heaters to minimize liquid refrigerant accumulation in compressor during shutdown and to prevent refrigerant dilution of oil.

5. Compressor assembly shall be installed on rubber vibration isolators and shall have internal spring isolation.

6. Compressors shall be single-phase.

J. Controls: Controls shall consist of a microprocessor based control system with a two way communicating infra-red remote control. The temperature control range shall be from 54 F to 90 F. The unit shall have the following:

1. An automatic restart after power failure at the same operating conditions as at failure.

2. Day/Night setback timer modes.

3. Evaporator coil freeze protection.

4. Clock.

5. Filter needs cleaning status indication.

6. Automatic airsweep control to provide on or off activation of airsweep louvers.

7. Auto mode to provide modulating fan speed based on difference between temperature setpoint and space temperature.

8. Fan only operation to provide air circulation when no cooling or heating is required.

9. Fans speed control shall be user-selectable: high, medium, low, or automatic operation during all operating modes.

10. A time delay shall prevent compressor restart in less than 3 minutes.

11. Automatic heating-to-cooling changeover to provide automatic heating and cooling operation. Control shall include deadband to prevent rapid mode cycling. (Heat Pump Models)

12. Sleep set back.

13. Set temperature and room temperature displays.

14. Dehumidification mode.

15. Fahrenheit or Celsius display.

K. Filters: Unit shall have filter track with factory-supplied cleanable filters.

L. Electrical Requirements: Unit shall operate on 208v 60 Hz power supply. Power and control connections shall have terminal connections.

M. Operating characteristics: See Drawings.

N. Options:

1. Low Ambient Kit: wind baffle, isolation relay crankcase heater.

2. Units shall have factory standard internal condensate pump.

3. Wall mount kit.

(23) KV-1: Vent-A-Kiln model 1437, with 500 cfm blower, flexible duct, overhead pulley and counterweight system, swinging wall bracket (11-47), time controller MTC105, or as required, or approved equal. One per kiln.

(24) KV-2: Vent-Sure vacuum wall mount kiln vent system with bypass box, 3” flexible duct, or as required, or approved equal. One per kiln.

(25) Ductwork

A. Provide opposed air foil blade volume dampers in all rectangular duct branches and butterfly dampers in all round duct branches.

B. Provide back draft damper for all exhaust fans if motor operated dampers are not specified. Provide 1/8-inch mesh insect screen at all exhaust discharges.

C. Pressurize each duct until the duct pressure reaches maximum flow and static the AHU is capable of achieving. Survey joints, seam penetrations and fittings for a audible leaks. Mark and repair all leaks after shutting down blower.

(26) Ductwork Supports

A. Hold all ductwork tight against roof structure.

B. Support all ductwork to prevent sag, play, and swing.

(27) Access

A. Furnish all fans with consideration of location of motor and drive.

B. Provide access to all fire/smoke dampers, damper motors, through ductwork and also through any intervening construction such as shaft walls, room partitions, ceilings, etc. Access opening shall be large enough to permit maintenance and resetting of the device.

(28) Collars

A. Provide 2-inch wide 18 gauge sheet metal collars where exposed ducts pass through walls, floors, or ceilings, finish to match adjacent surfaces.

(29) Balancing

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

(30) Offsets and Transitions

A. The drawings may not show all required offsets and transitions. Provide offsets and transitions with as small an angle of offset as possible.

(31) Suggested Drawing Notes:

1. See Architectural specification sections for exterior wall louvers.

2. Provide all Mechanical systems in accordance with the fire wall, fire blocking and fire stop provisions shown on the Architectural drawings.

3. Coordinate supply air diffusers and return/exhaust air grille locations with Architectural drawings. Coordinate duct routing with light fixture locations.

4. Mechanical work shown is diagrammatic. Provide offsets, transitions, and other ductwork, piping and associated construction where required to avoid building structural elements or the work of together trades.

5. Ductwork dimensions shown are net inside dimensions, enlarge duct dimensions as required for internally lined ductwork.

6. Paint exterior ductwork, fans, curbs and sheet metal with epoxy finish, color as selected by Architect, provide sheet metal sleeves for plumbing vents, combustion flues and all other Mechanical components penetrating the roof to match roofing material and color. Paint unfinished galvanized, aluminum or ss exterior surfaces, materials or equipment, provided under Division 15, color as selected by Architect.

7. Temperature sensors shall be located where shown 48 inches above finish floor. (Verify)

8. Provide bird screens inside all exterior louvers.

9. Provide access panels for all Mechanical and Plumbing equipment.

Section 15900, Controls and Instrumentation
(1) Description: This section describes specific requirements, products, and methods of execution relating to the system of temperature controls and instrumentation for the project.

(2) Scope Of Work

A. Furnish and install a complete and fully functioning Direct Digital Control (DDC) System and/or Distributed Control System (DCS) to control and monitor the building air conditioning, heating and ventilation systems as described in this Section, in the sequences of Operation, and as indicated on the Drawings.

B. The DDC and/or DCS system shall utilize distributed, microprocessor based control products which communicate with a local operation terminal (client) located in building or facility. Local operation terminal and any required associated software and hardware shall be provided under this contract.

C. The DDC and/or DCS system shall consist of local operation terminal, terminal unit controllers, building interface modules, sensors, automatic valves, actuators, control dampers, operators, operating software, operator training, wiring, installation labor, warranty and all other necessary material devices, and labor to provide a complete and fully functioning system, whether noted or omitted herein or on drawings.

(3) Quality Assurance

A. Manufacturer’s Qualifications: Firms regularly engaged in manufacturer of DDC and/or DCS control equipment, of types and capacity required, and whose products have been in satisfactory use in similar service for not less than five (5) years.

B. Installer’s Qualifications: Firms specializing and experienced in DDC and/or DCS control system installations for not less than (10) years and located in a 50 mile radius of the Tri-Cities.

(4) Acceptable Manufacturers

A. General: The latest versions of the Alerton BACtalk System Building Controls have been selected by the Owner as a physical and quality standard for this procurement. This is no substitute specification which has been determined to be in the best interests of the Owner in the standardization of HVAC controls. This standardization provides the opportunity for long-term reduction of operations, maintenance, and repair cost associated with the HVAC systems. (See Alternates for Carrier Comfort (view) Network System).

(5) Warranty

A. The DDC Contractor shall warrant that all systems, sub-systems, component parts, and software are fully free from defective design, materials, and workmanship for a period of