33
Console Water Source Heat Pumps
HVAC Guide Specifications
Size Range:
7,800 to 16,000 Btuh
Cooling Capacity
10,400 to 19,300 Btuh
Heating Capacity
Carrier Model Number:
50KQL
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 50KQL.
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 perfor-
mance rated and certified in accordance with
ARI/ISO Standard 13256-1, and safety listed in
accordance with NRTL or CSA. All units shall have
ARI/ISO and NRTL or 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 are not accept-
able. Standard operating range is 60 to 95 F enter-
ing water temperature.
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 refrig-
erant-to-water heat exchanger, air-to-refrigerant heat
exchanger, 4-way reversing valve, fan motor assem-
bly, compressor, TXV metering device, and all inter-
nal 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 12 in. D x 24 in. H).
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.
5. Optional mute package shall consist of addi-
tional sound attenuating materials strategically
applied to the compressor compartment, and
substitution of
1
/
2
in. noise dampening insula-
tion for all surfaces that normally have
1
/
4
in.
insulation.
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 psig refrig-
erant 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 psig
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 water-to-refrigerant heat
exchangers shall be cupronickel.
7. Optional Extended Range for units operating
with entering water temperatures below dew
point. For use in operating range with entering
water temperatures from 20 to 110 F.
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.
Guide specifications
