H22.REV

HEAT PUMPS

NOTE: FINAL COPY: MAY, 1987.

Part 1 -	GENERAL

1)	WORK INCLUDED

A.	Work in this Section includes the providing of labor, materials, equipment and services necessary for a complete and safe installation in accordance with the contract documents and all applicable codes and authorities having jurisdiction for the following

1.	Packaged air-to-air heat pumps.

2.	Installation of units.

2)	RELATED WORK AND REQUIREMENTS

A.	Requirements of GENERAL CONDITIONS, DIVISION NO. 1 and Section GENERAL PROVISIONS FOR HEATING, VENTILATING, AND AIR CONDITIONING WORK apply to all work in this Section

NOTE: EDIT TO SUIT PROJECT REQUIREMENTS. INCLUDE ONLY SECTIONS DIRECTLY AFFECTING WORK OF THIS SECTION

B.	Related work in the following Sections:

1.	SHEET METAL WORK.

2.	MOTORS.

3.	MOTOR CONTROLLERS.

4.	AUTOMATIC CONTROL SYSTEMS.

5.	BALANCING AIR AND WATER SYSTEMS.

6.	-----.

3)	REFERENCE STANDARDS

A.	Published Specifications' standards, tests or recommended methods of trade, industry or governmental organizations apply to work in this Section

B.	Comply with all applicable national, state and local codes and refer to Section GENERAL PROVISIONS FOR HEATING, VENTILATING, AND AIR CONDITIONING WORK for additional Reference Standards

4)	QUALITY ASSURANCE

A.	Conform to AMCA Bulletins regarding construction and testing. Fans shall bear AMCA certified rating seal

B.	Scheduled equipment performance is minimum capacity required

C.	Scheduled electrical capacity shall be considered as maximum available

D.	Guarantees: The complete unit shall be guaranteed for one year and compressor unit shall be guaranteed for (two) (three) (four) (five) years

NOTE: INCLUDE AS APPLICABLE FOR THIS PROJECT. OBTAIN OCTAVE BAND ANALYSIS FROM MANUFACTURER OF EQUIPMENT AND INSERT IN FOLLOWING SCHEDULE OR IN SCHEDULE ON DRAWINGS

E.	Acoustical Criteria: The following shall be the maximum permissible sound power levels by octave bands for air handling units and fans, when installed as indicated on drawings

SOUND

1.	Fan NO. Component Octave Bands 1 2 3 4

2.	Refer to schedule on drawings.

SOUND

F.	Ratings: Units shall be rated in accordance with ARI Standard 360

1.	Cooling and heating capacity shall be rated in accordance with ARI Standard 240-77 for air-to-air heat pumps

2.	Cooling capacity shall be net, with motor heat deducted

G.	Refer to Section GENERAL PROVISIONS FOR HEATING, VENTILATING, AND AIR CONDITIONING WORK for additional Quality Assurance requirements

5)	SUBMITTALS

A.	Submit the following shop drawings to Architect and/or Engineer

1.	Manufacturer's descriptive literature, installation instruction, operating instructions, maintenance and repair data

2.	Performance Data.

NOTE: COORDINATE WITH PROJECT DIRECTOR AND ARCHITECT THE REFERENCED SECTION NUMBERS. EDIT TO SUIT PROJECT REQUIREMENTS. INCLUDE ONLY REFERENCES DIRECTLY AFFECTING WORK OF THIS SECTION

3.	Dimensions and weights.

4.	Test reports.

5.	Wiring and control diagrams.

6.	Fan curves.

Part 2 -	PRODUCTS

1)	BASE BID MANUFACTURERS

A.	Packaged air-to-air heat pumps: Carrier Corporation, Lennox Industries, Inc. and Trane Co

2)	HEAT PUMPS

A.	Provide packaged one-piece units, complete with:

NOTE: INCLUDE AS APPLICABLE FOR THIS PROJECT. DELETE ITEMS NOT REQUIRED IN THIS PROJECT

1.	Compressors.

2.	Indoor and outdoor coils.

3.	Supply fan.

4.	Condenser fans.

5.	Filters.

6.	Controls.

7.	Insulated casing.

B.	Provide units completely factory assembled, piped, dehydrated and wired and factory tested for three hours minimum, and charged with refrigerant R-22 and compressor oil

C.	Provide heat pumps for roof-top or floor-level installation, similar to Carrier Series EQ

D.	Cabinets shall be fabricated of cold rolled steel, reinforced and braced with angles and provided with access sections with hinged door with quick-opening handles. Insulate with minimum 1 inch thick, coated fiberglass board NFPA-90 approved, 1.0 lb. density

NOTE: INCLUDE AS APPLICABLE FOR THIS PROJECT. COORDINATE FINISH OF EXPOSED UNITS WITH ARCHITECT. IT MAY BE POSSIBLE TO OBTAIN THE PROPER COLOR FROM THE MANUFACTURER. IF NOT, ARRANGE WITH ARCHITECT TO SPECIFY FINISH PAINTING OF THE UNITS

1.	Finish: provide standard factory finish, galvanized and painted. Submit color options, if any, for approval by the Architect and/or Engineer

2.	Units shall be completely weatherproof; provide joints sealed to prevent leakage with tops crowned or sloped to drain and no pockets to retain water

3.	Provide gasketed access panels, with quick opening handles with brass or stainless steel hinge

E.	Provide insulated drain pans under cooling coils and fan.

F.	Provide unit base consisting of one piece welded assembly base installed on curb complete with sealing gasketing, curb overhang, lifting lugs and unit tiedown points

G.	Provide drain provisions for water run-off from outdoor coil

H.	Electrical: provide knock-outs for power and control connections with one-point connection. Provide 115 volt convenience outlet

I.	Indoor fans: provide AMCA certification in accordance with ARI Standard 360. Refer to Fan Schedule on drawings for minimum capacities. Provide permanently-lubricated bearings and resilient mounts

FAN

1.	Fan performance shall be based on sea level conditions.

2.	Fan perfornamce shall be based on ----ft. altitude conditions

FAN

3.	Wheels shall be forward-curved formed steel or extruded aluminum statically and dynamically balanced at factory

4.	Belt drives: provide minimum 1.4 times motor hp. capacity with cast iron pulley and variable-pitch diameter motor pulley

5.	Do not operate fans for any purpose, temporary or permanent, until ductwork is clean and filters are in place

J.	Outdoor fans with safety guard direct-drive propeller fans shall be statically and dynamically factory balanced. Motors shall be weatherproof, permanently lubricated with built in thermal protection and UL listed

NOTE: INCLUDE AS APPLICABLE FOR THIS PROJECT. OPTIONAL ACCESSORY.

K.	Power Exhaust: this field-installed accessory, including multiple forward-curved centrifugal fans, belt-driven shall be similar to indoor fan specified above

L.	Coils:

COILS

1.	Coils as specified in Section "Air Handling System Equipment"

2.	Design and Construction: Coils shall be extruded surface type non-ferrous coils with tubes of copper or brass and minimum thickness of 0.020 inch. Plate fins shall be copper or aluminum, flat or conformed, minimum thickness of 0.008 inch and mechanically bonded to tubes

a.	Rows and fin spacing as indicated or schedules or as required to maintain scheduled conditions. Submit selections. Rows shall be a minimum of four (4) and fin spacing shall be a minimum of eight (8) and a maximum of fourteen (14) fins per inch. Circuiting shall be as required and coils shall be certified by A.R.I. per current Standard 410. Coils shall be pressure and leak tested at factory

COILS

3.	Serpentine type indoor and outdoor coils with brass or copper header arranged to prevent trapping of oil and to distribute liquid refrigerant R-22 to circuits. Joints shall be silver soldered or brazed. Include factory assembled multi-circuit distributor and provide one circuit per compressor

M.	Compressors: Serviceable semi-hermetic or hermetic type with overload protection, crankcase heater, vibration isolators, over-temperature, over-current and high-pressure controls and internal pressure relief. Comply with ARI Standard 240 Test Conditions. Operating temperature limits shall be as follows

1.	On heating cycle, compressor shall operate to -20 deg F outside air temperature without shutting off

2.	On cooling cycle, compressor shall operate above 35 deg F outside air temperature

N.	Refrigeration specialties: suction and discharge line service gauge ports, check and expansion valves, reversing valves, accumulators and driers

O.	Throwaway filters; either of the following types are acceptable

1.	Disposable filters with fiberboard frames, pleated cotton-cellulose media, steel or fiberboard grids each side, two inches thick

2.	Replacable media filters with replaceable fiberglas pad, steel frame and grids

NOTE: INCLUDE AS APPLICABLE FOR THIS PROJECT. OPTIONAL ACCESSORY.

P.	Economizer dampers shall be fully modulating dampers for outside air, return air and exhaust air. Dampers shall be low leak construction type, with maximum leakage of 6 cfm per sq ft at one inch pressure drop across damper. Dampers shall have side seals and be factory installed with actuators

Q.	Controls:

NOTE: INCLUDE AS APPLICABLE FOR THIS PROJECT: DELETE REFERENCES TO "ECONOMIZER" IF THAT OPTIONAL ACCESSORY IS NOT INCLUDED IN THIS PROJECT

1.	General: Automatic temperature controls for overall operation of building systems will be provided under Section "AUTOMATIC CONTROL SYSTEMS". CONTROLS AND ELECTRICAL WIRING PROVIDED UNDER THIS CONTRACT SHALL BE AS FOLLOWS

a.	Internal controls required for operation of economizer system and condensing unit operation, upon starting signal from external control interface

b.	Additional relays, internal wiring, additional facilities and terminals to make external control sequences compatible with internal control sequence

c.	Terminal strips in control compartment for thermostats and field-installed accessories

d.	Electrical Wiring:

(1)	Electrical wiring and controls shall conform to requirement of NEC

(2)	Wiring shall be color coded and/or numbered for easy identification

(3)	Unit control panel shall include integral power disconnect, circuit breaker type overload protection, starters and relays, all factory wired and run tested prior to shipment

e.	Space temperature controls: Room thermostat with the following

(1)	Fan - "Auto-On"

(2)	Standby Heat - "Normal-On"

(3)	Indicator light.

MAN

(4)	Manual changeover with single set point with "Heat-Off-Cool" switch

(5)	Automatic changeover with dual-set point with system "Off-On-Auto" switch

MAN

(6)	Discharge temperature sensor, electronic logic panel, thermostat sub-base with compressor malfunction lock-out light and related acessories

f.	Internal operating controls shall have the following control staging

(1)	Two stages mechanical cooling.

(2)	Two stages mechanical heating.

(3)	Two stages electrical heating.

NOTE: INCLUDE AS APPLICABLE FOR THIS PROJECT. SPECIFY ONLY FOR MULTIPLE COMPRESSOR UNITS

(4)	Separate and independent refrigeration and control systems shall permit standby operation of either compressor if one is locked out

g.	Safety Controls: controls for high pressure, loss of charge, indoor coil freezing and current and temperature sensitive overload devices. Protective controls shall prevent compressor restart. When unit locks out in heating mode, control circuit shall compensate for compressor loss with auxiliary heat. Defrost control shall prevent frost accumulation on outdoor coil during heating cycle and allow only one outdoor section to defrost at a time

NOTE: INCLUDE AS APPLICABLE FOR THIS PROJECT. OPTIONAL CONTROLS: SPECIFY AS REQUIRED

h.	Short Cycle Control shall prevent compressor short cycling resulting from rapid change in thermostat setting and to prevent compressor restart within five minutes after shutdown

i.	Head Pressure Control: outdoor fan speed control shall maintain head pressure down to -20 degrees F outside air temperature, on cooling cycle

j.	Remote control and monitoring panel for each unit shall contain system operating switch, cooling mode, heating mode, compressor 1, compressor 2 and no heat and filter

3)	ROOF CURBS

A.	Roof curves shall be galvanized steel construction with wood nailer strips. Match unit base with gaskets between unit and curb. Provide completely weatherproofed installation

NOTE: INCLUDE AS APPLICABLE FOR THIS PROJECT. INCLUDE THE FOLLOWING OPTIONS AND ACCESSORIES AS REQUIRED BY THE PROJECT. NOTE! MAKE SURE THE OPTIONS SELECTED DO NOT CONFLICT WITH EACH OTHER

4)	ACCESSORIES

A.	Electric Strip Heaters shall be open wire nichrome elements and stage elements with time delay between stages and required operating and safety controls. Units with factory installed heaters shall have UL label. Protect branch circuits per NEC

B.	Energy Management Controls: night set-back control adjustable in time and duration. Heating and cooling reset control. Morning warm-up and cool down control. During warm-up and cool down cycle outside air dampers shall be in fully closed position and shall automatically modulate when return air temperature reaches selected set point

C.	Outside Air:

ECON

1.	Dry bulb controlled economizer shall be operated through room thermostat. Use outdoor air for cooling when outdoor temperature is lower than inside. Automatically modulated outdoor and return air dampers shall maintain proper discharge air temperature to room. Dampers shall assume full closed position when indoor fan stops

2.	Motorized outdoor air dampers: Barometric relief damper

3.	Manual outside air dampers: provide barometric relief damper

4.	100 percent return air.

ECON

Part 3 -	EXECUTION

1)	INSTALLATION

A.	Install units in accordance with manufacturer's instructions

NOTE: COORDINATE WITH ARCHITECT AND STRUCTURAL ENGINEER. EDIT TO SUIT PROJECT REQUIREMENTS

B.	Roof-Top Mounting: mount on curb specified above.

C.	Piping Connections:

1.	Condensate drain piping: refer to Section "Piping".

NOTE: INCLUDE AS APPLICABLE FOR THIS PROJECT. SPECIFY ONLY IF AUXILIARY HEAT IS BY HOT WATER RATHER THAN ELECTRICAL

2.	Provide heating hot water piping.

2)	TESTING, ADJUSTING AND START-UP

A.	Start-up work shall be by service personnel employed by manufacturer

B.	Test and adjust heat pump units to insure proper operation.

1.	Check that all drives are aligned, set screws are tightened and seated. Outside air and exhaust air dampers are fully closed and return damper fully open when heat pump is off.

NOTE: INCLUDE AS APPLICABLE FOR THIS PROJECT. SPECIFY IF THIS OPTIONAL ACCESSORY IS INCLUDED IN PROJECT

2.	Operate economizer cycle through its extremes, using unit controls to check calibration and proper damper operation

C.	Provide operational tests to demonstrate proper operation and adequate capacity at completion of balancing and adjusting

D.	Supply and install sheaves as necessary for final air balancing

E.	Coordinate operational tests with Section "Automatic Control Systems" and Section "Balancing Air and Water Systems"

F.	Submit report certifying above work to Architect and/or Engineer