Guide Specifications - Carrier 50KQA Product Data

Guide specifications

Console Water Source Heat Pumps
HVAC Guide Specifications
Size Range: 6,800 to 17,600 Btuh
Cooling Capacity
8,600 to 21,000 Btuh
Heating Capacity
Carrier Model Number: 50KQA, KQD
Part 1 — General
1.01 SYSTEM DESCRIPTION
A. Install Water Source Heat Pumps, as indicated on
the plans with capacities and characteristics as listed
in the schedule and the specifications that follow.
Units shall be Carrier model 50KQA (standard tem-
perature range 60 F to 95 F) or model 50KQD (low
temperature range 40 F to 110 F).
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. All equipment listed in this section must be rated in
accordance with ARI and CSA. The units shall have
ARI, CSA labels.
B. All units shall be factory tested under normal operat-
ing conditions at nominal water flow rates. Units
which are tested without water flow rates are not
acceptable.
Part 2 — Product
2.01 EQUIPMENT
A. Heat Pump Assembly:
Factory-tested and assembled single-piece packaged
heating and cooling heat pump units shall be factory
wired, charged with non-CFC R-22, contain
refrigerant-to-water heat exchanger, air-to-refrigerant
heat exchanger, 4-way reversing valve, fan motor
assembly, compressor, TXV metering device, and all
internal controls and safety devices.
B. Unit Cabinet:
1. The cabinet shall be constructed of heavy gage
steel with welded corner bracing. A removable
front cabinet allows easy service access to the
chassis. The cabinet shall have a 30-degree
sloped top with an aluminum rigid bar type dis-
charge grille.
2. An access door shall be provided to cover the
swing down control section. For all capacities of
the Console Heat Pump, the cabinet shall be
one size (48-in. L x 9
3. Options include a locking control panel for
added security; a bottom or front return with
left or right hand configurations for ease of
installation. Available with 3 or 5 in. subbase,
with or without motorized damper.
4. The cabinet shall be powder painted.
1
/ - in. W x 24-in. H).
2
C. Fan and Motor Assembly:
The fan motors shall be multi-speed permanently
lubricated, PSC (permanent split capacitor) type
with thermal overload protection. To facilitate field
service all units shall have a slide out fan deck and
quick electrical disconnect.
D. Refrigerant Components:
1. Units shall have a sealed refrigerant circuit includ-
ing a hermetic compressor, a refrigerant meter-
ing device, a finned tube refrigerant-to-air heat
exchanger, a reversing valve, a coaxial (tube-in-
tube) refrigerant-to-water heat exchanger, and
safety controls including a high-pressure sensor, a
loss-of-charge sensor to protect against loss of
refrigerant, and low water temperature (freeze-
stat) sensor.
2. Rotary compressors shall have thermal over-
load protection and shall be located in an
insulated compartment to minimize sound
transmission. Units shall have the compressor
mounted on isolators to reduce noise and vibra-
tion transmission.
3. Refrigerant-to-air heat exchangers shall utilize
enhanced aluminum fins and rifled copper tube
construction rated to withstand 425 psi refriger-
ant working pressure.
4. Refrigerant-to-water heat exchangers shall be of
copper inner water tube and steel refrigerant
outer tube design rated to withstand 450 psi
working refrigerant pressure.
5. Reversing valve shall be four-way solenoid-
activated refrigerant valves which shall fail to
heating operation. If the unit fails to cooling a
low-temperature thermostat must be provided
to prevent over-cooling of the room.
6. Optional coaxial
exchangers shall be cupronickel.
E. Controls and Safeties:
Units which may be reset at the disconnect switch
only shall not be acceptable.
1. Electrical:
A control box shall be located within the unit
and shall contain controls for compressor,
reversing valve and fan motor operation.
2. Piping:
a. Copper tubes with a
shall be provided on the supply and return
water connections for the purpose of form-
ing a sweat connection to field-supplied dis-
tribution piping.
b. Optional threaded connections: A
male or female pipe threaded fitting shall be
factory mounted on the supply and return
water connections.
water-to-refrigerant heat
5 / -in. OD dimension
8
1
/ -in.
2
35