Outdoor Unit Accessories - Carrier 40QNC Product Data

OUTDOOR UNIT ACCESSORIES

Low Ambient Kit
The kit controls condenser fan cycling using a pressure switch. It is
specifically designed to cycle the outdoor fan- -motor in response to
saturated condensing pressure. This device maintains a constant
saturated condensing temperature of 100 _F ± 10 _F (37.78_C ±
6.5 _C) at outdoor- -air temperatures between 55 _F and - -20 _F
(12.78_C ± - -12.22_C), and can be used on all outdoor units
without changing the outdoor fan motor.
Winter Start Control
The Winter Start Control is a SPST delay relay. The control
bypasses the low pressure switch for approximately 3 minutes to
permit start- -up for cooling operation under low load conditions at
low ambient temperatures. This relay is recommended on cooling
only systems that have the accessory Low Ambient Kit.
Isolation Relay
The Isolation Relay must be used when Low Ambient Kit is used
with heat pumps to ensure the pressure switch is bypassed when
unit is running in heat pump mode.
Liquid Line Solenoid Valve
The Liquid Line Solenoid Valve is an electrically operated shut- -off
valve that is installed at the outdoor unit to stop and start
refrigerant flow in response to compressor operation. The valve
maintains a column of refrigerant in the liquid line between
compressor operating cycles and is required for certain long line
applications and to improve system performance.
Crankcase Heater
The Crankcase Heater is available for units with scroll compressors
and clamps onto the compressor oil sump. It is recommended for
low ambient applications. The Crankcase Heater is standard on
38QRF030.
Wind Baffles
The Wind Baffle is a sheet metal shield used to provide improved
unit operation during high winds and is recommended whenever
the low ambient accessory is used.
Stacking Kit
Stacking Kits allow stacking of equally sized units or permit
smaller units to be stacked on top of larger units.
NOTE: THIS KIT CANNOT BE USED WITH HEAT
PUMPS.
(304.8)
(304.8)
(304.8)
NOTE: Numbers in ( ) are mm (304.8)
TWO UNITS MOUNTED
(IDENTICAL SIZES)
Fig. 5 – Stacking Kit
Wall Mounting Kit
Wall mount brackets are mounted on the outside of the structure to
raise the unit from ground level, or to mount the unit on a wall
adjacent to a sloping roof. Wall mounts are also useful in areas of
heavy snowfall or where space is at a premium.
NOTE: Unit must be at least 6 in. (152.4 mm) from wall.
Fig. 6 – Wall Mounting Kit
5
TWO UNITS MOUNTED
(UNEQUAL SIZES)
A06417
D06006