Carrier 50HQ User Manual download pdf (Page 30)

Commercial Horizontal Water Source Heat

Pump Units

HVAC Guide Specifications

Size Range: 70,000 to 120,000 Btuh Cooling

Capacity

Carrier Model Number: 50HQP

Part 1 — General

1.01 SYSTEM DESCRIPTION

A. Heat pump units are designed to operate with 60 to

95 F water temperature or 20 to 110 F water tem-

perature when the extended range option is

selected. Units shall consist of high-efficiency scroll

compressor(s) and shall have single or dual indepen-

dent refrigeration circuits. The air discharge is hori-

zontal 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.

1.02 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.

Part 2 — Product

2.01 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-to-

air 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 galva-

nized sheet metal with removable service pan-

els, 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 con-

nected 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 recom-

mended 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

-in.

thick, 1

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 cen-

trifugal fans. The fan motor shall be perma-

nently lubricated with internal overload

protection.

2. Fan motor shall be isolated from the fan hous-

ing 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 fac-

tory 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 compres-

sor 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.

Guide specifications

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Carrier 50HQ User Manual Page 30

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