HVAC Commercial Horizontal Water Source Heat Pump Units Specifications Guide

HVAC Guide Specifications Commercial Horizontal Water Source Heat Pump Units

Size Range:70,000 to 120,000 Btuh Cooling CapacityCarrier Model Number:50HQP

General

SYSTEM DESCRIPTION

A. Heat pump units are designed to operate with 60 to 95 F water temperature or 20 to 110 F water temperature when the extended range option is selected. Units shall consist of high-efficiency scroll compressor(s) and shall have single or dual independent refrigeration circuits. The air discharge is horizontal with right/left discharge as specified on drawings.B. Units shall be individually packaged with wooden skid covered with protective corner posts and plastic stretch wrapping for maximum protection.

QUALITY ASSURANCE

A. Basic unit shall be rated and certified in accordance with AHRI/ISO/ASHRAE Standards.B. Units shall have insulation and adhesive which meet NFPA 90A requirements for flame spread and smoke generation, and assembled units shall be ETL certified.C. Units shall be factory tested under normal operating conditions at nominal water flow rates to assure proper operation of all components and safety devices.

Product

EQUIPMENT

A. Heat Pump Assembly:

Factory-tested and assembled single-piece water source heat pump units shall be factory wired, charged with non-CFC R-410A refrigerant, contain refrigerant-to-water heat exchanger, refrigerant-toair heat exchanger, 4-way reversing valve, fan motor assembly, compressor, metering device, and all internal controls and safety devices.

B. Unit Cabinet:

  1. Unit shall be constructed of heavy gage galvanized sheet metal with removable service panels, hanging brackets, and insulated galvanized steel condensate pan of welded construction.
  2. Supply and return water connections shall be copper FTP, flush-mounted and rigidly connected to prevent damage to tubing and/or noise generation.
  3. Cabinet construction shall permit service testing without air bypass on coil and shall incorporate factory-installed supply ductwork connections. Direct connection to fan housing is not recommended due to sound considerations.
  4. Unit shall have separate entrances for high and low-voltage electrical supplies.
  5. One-in. wide filter bracket and 1-in. fiberglass disposable filter shall be provided on each unit.
  6. All interior surfaces shall be lined with 1/2-in. thick, 11/2 lb per cu ft density acoustic type fiberglass insulation. All fiberglass shall be coated and all edges shall be tucked under flanges to prevent the introduction of glass fibers in the airstream.

C. Fan and Motor Assembly:

  1. Units shall have belt-driven single or dual centrifugal fans. The fan motor  shall be permanently lubricated with internal overload protection.
  2. Fan motor shall be isolated from the fan housing by flexible isolation grommets.

D. Compressors:

Unit shall have heat pump duty, high-efficiency scroll compressor(s) with internal and external isolation.

E. Heat Exchangers:

  1. Refrigerant-to-air coil shall be aluminum/ copper finned-tube construction type rated for 450 psig and shall be fully degreased at the factory to prevent possible condensate blowoff.
  2. Refrigerant-to-water heat exchanger shall be steel/copper tube-in-tube type rated for 450 psig refrigerant, 450 psig water-side pressures.
  3. Optional steel/cupronickel refrigerant-to-water heat exchanger shall be used for open loop applications, or where water quality cannot be maintained as specified by manufacturer.

F. Refrigerant Components:

  1. Refrigeration circuit components shall include liquid line service valve, suction line service valve, reversing valve, a full charge of compressor oil, and a holding charge of refrigerant.
  2. Thermostatic expansion valve shall be provided for refrigerant metering.

G. Controls and Safeties:

  1. Safety devices on all units shall include low-pressure sensor or loss-of-charge switch, high-pressure switch, low water temperature sensor, and condensate overflow switch.
  2. The standard Complete C electronic control system shall interface with a heat pump (Y,O) wall thermostat (mechanical or electronic). The control system shall have the following features:a. 75 va transformer.b. Anti-short cycle time delay on compressor operation; time delay shall be 5 minutes minimum.c. Random start on power-up.d. Low voltage protection.e. High voltage protection.f. Condensate overflow shutdown.g. Unit shutdown on low refrigerant pressures.h. Unit shutdown on high or low water temperature (selectable for antifreeze solutions).i. Option to reset unit at thermostat or disconnect. Fault type shall be retained in memory if reset at thermostat.j. Automatic intelligent reset. Unit shall automatically restart 5 minutes after shutdown if the fault has cleared. Should a fault occur 3 times sequentially, then lockout will occur.k. Ability to defeat time delays for servicing.l. Light-emitting diode (LED) to indicate high pressure, low pressure, improper voltage, water coil freeze protection, air coil freeze protection, condensate overflow,  and control status.m. Unit Performance Monitor to indicate inefficient operating conditions prior to unit lockout.n. Remote fault type indication at thermostat.o. Single harness connection for all safety devices.p. Selectable 24-v or pilot duty dry contact alarm output.q. 24-v output to cycle a motorized water valve with compressor contactor.
  3. The optional Deluxe D electronic control shall have all the features of the Complete C control, with the following additional features:a. A removable thermostat connector.b. Random start on return from night setback.c. Minimized reversing value operation for extended life and quiet operation.d. Night setback control from low temperature thermostat, with 2-hour override initiated by a momentary signal from the thermostat.e. Dry contact night setback output for digital night setback thermostats.f. Ability to work with heat/cool (Y, W) thermostats.g. Ability to work with heat pump thermostats using O or B reversing valve control.h. Single grounded wire to initiate night setback or emergency shutdown.i. Boilerless system control can switch automatically to electric heat at low loop water temperature.j. Control board shall allow up to 3 units to be operated from one thermostat without any auxiliary controls.k. A relay to operate an external damper. The control to be such that the damper will not open until 30 minutes after the unit comes back from Unoccupied mode.l. Fan speed selection at thermostat. m. A relay to restart a central pump or control a 24-v motorized water valve.
  4. PremierLink™ Controller:This control will function with Carrier Comfort Network® (CCN) and ComfortVIEW™ software. It shall also be compatible with ComfortLink™ controllers. It shall be ASHRAE 62-99 compliant and Internet ready. It shall accept a CO2 sensor in the conditioned space and be demand control ventilation (DCV) ready. The communication rate must be 38.4K or faster.
  5. LONWORKS Interface System:Units shall have all features listed above (either Complete C or Deluxe D) and the control board shall be supplied with a LONWORKS interface board, which is LONMark certified. This will permit all units to be daisy chained via a 2-wire twisted pair shielded cable. The following points must be available at a central or remote computer location:a. space temperatureb. leaving-water temperaturec. discharge-air temperatured. command of space temperature set pointe. cooling statusf. heating statusg. low temperature sensor alarmh. low pressure sensor alarmi. high pressure switch alarmj. condensate sensor alarmk. high/low voltage alarml. fan “ON/AUTO” position of space thermostatm. unoccupied / occupied commandn. cooling commando. heating commandp. fan “ON / AUTO” commandq. fault reset commandr. itemized fault code revealing reason for specific shutdown fault (any one of 7) This option also provides the upgraded 75 va control transformer with load side short circuit and overload protection via a built-in circuit breaker.

H. Electrical:

  1. A control box shall be located within the unit compressor compartment and shall contain a 75 va transformer, 24-volt activated, 3-pole compressor contactor, terminal block for thermostat wiring and solid-state controller for complete unit operation. Electromechanical operation WILL NOT be accepted.
  2. Units shall be nameplated for use with timedelay fuses or HACR circuit breakers.
  3. Unit controls shall be 24-volt and provide heating or cooling as required by the remote thermostat.I. Sound Attenuation Package (Mute Package):Consists of attenuation material that is applied to the cabinet to reduce noise. Attenuating material shall be applied to the basepan, compressor access panels, and blower housing.J. High-Static Blower:Provides increased airflow at various static pressure conditions.K. Special Features:

 

  1. Aquazone™ Thermostat Controls:a. Programmable multi-stage thermostat offers 7-day clock, holiday scheduling, large backlit display and remote sensor capability.b. Programmable 7-day light-activated thermostat offers occupied comfort settings with lights on, and unoccupied energy savings with lights off.c. Programmable 7-day flush-mount thermostat offers locking coverplate with tamperproof screws, flush to wall mount, dual point with adjustable deadband, O or Bterminal, and optional remote sensor.d. Programmable 5-day thermostat offers 2-stage heat, 2-stage cool, auto changeover, 5-minute built-in compressor protection, and included locking cover.e. Non-programmable thermostat offers 2 heat stages, 2 cool stages, auto changeover, 5-minute built-in compressor protection, and included locking cover.
  2. Aquazone™ system loop control panel shall include a pre-programmed, easy to use, Carrier Comfort Controller set up for a WSHP system. The features of the loop control panel shall be configured for the specific installation to include the following:a. The loop control panel shall coordinate, monitor, or control all WSHP units and ancillary equipment including cooling towers, boilers, and system pumps.b. Panel shall be provided with 2, 4, 6, or 8 stages of system heat rejection and addition.c. Panel shall be provided with stand-alone (i.e., non-communicating) operation with the ability to control 10 or 18 zones of WSHP units.d. Panel shall be provided to control variable frequency cooling tower fan operation.e. System pumping operation shall be configured for start/stop, lead/lag, or variable frequency pump operation.f. Loop panel shall be direct digital control compatible using the CCN and WSHP units using PremierLink CCN controllers.
  3. Filter Rack (2 in.):Filter rack enhances the filtration system of the water source heat pump.NOTE: Filter rack does not include filters.
  4. Fire-Rated Hose Kits:Kits include a fixed MPT on one end and a swivel with an adapter on the other end. Hose kits can be either stainless steel or galvanized.
  5. Ball Valves (Brass Body):Valves are for shutoff and balancing water flow. Available with memory, memory stop, and pressure temperature ports.
  6. Y Strainers (Bronze Body):Strainers are “Y” type configuration with a brass cap. Maximum operating pressure rating of strainers is 450 psig. Strainer screen made of stainless steel.
  7. Solenoid Valves (Brass Body):Valves provide slow operation for quiet system application.
  8. Hose Kit Assemblies:Assemblies include a ported ball valve with pressure temperature (P/T) plug ports and flexible stainless steel hose with swivel and nipple. Return hose includes a ball valve, preset measure flow (gpm) with two P/T ports, and flexible stainless steel hose with a swivel and nipple.
  9. Remote Sensors:Sensors for thermostats are available wired or wireless.
  10. Multiple-protocol WSHP Open controller remote sensors for Aquazone flush-mount thermostats and DDC control options. Only Carrier sensors can be used with the WSHP Open controller. Sensors are available as follows:a. SPT Standard offers space temperature sensor with communication port.b. SPT Plus offers space temperature sensor with set point adjust, local override with indicating light and communication port.c. SPT Pro offers space temperature sensor with LCD display, set point adjust, local override, alarm icon, outside air, and unit status with heating and cooling set points.d. SPT Pro+ offers space temperature sensor with LCD display, set point adjust, local override, alarm icon, outside air, unit status with heating and cooling set points, and fan speed control.
  11. PremierLink™ Accessories:Accessories include supply air temperature sensors, communicating room sensors, CO2 sensors, and linkage thermostats to provide a fully integrated DDC (Direct Digital Controls) system.
  12. Extended Range:Extended range units provide an insulated water circuit for the coaxial coil and refrigerant circuit to prevent condensation, and therefore potential dripping problems, in applications where the entering water temperature is beyond the normal operating range.

 

HVAC Commercial Horizontal Water Source Heat Pump Units Specifications Guide – HVAC Commercial Horizontal Water Source Heat Pump Units Specifications Guide –

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