Product data

Accessories – Field Installed
Low Ambient Kit:
The Low Ambient Kit is a solid state head pressure controller designed to control
condenser fan cycling, and is activated by a pressure sensor. It is specifically designed to control fan motor
cycles in response to saturated condensing pressure. This device maintains a constant saturated condensing
temperature of 100 deg F +/- 10 deg F at outdoor air temperatures between 55 deg and –20 deg F and can
be used on all condensing units without changing the fan motor. (Standard on HDS)
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 all systems that have the accessory
Low Ambient Kit. Winter Start Control can also be used to provide low ambient cooling at outdoor
ambient temperatures between 55 deg and 40 deg F.
Liquid Line Solenoid Valve:
The Liquid Line Solenoid Valve is an electrically operated shutoff 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.
Field Fabricated Accessories:
Field Fabricated Accessories including stacking kits, snow and ice stands,
wind baffles, and wall mounting brackets should be constructed in the field using field supplied materials.
For drawings contact your Carrier Representative.
Stacking Rails:
Stacking Rails allow stacking of equally sized units or permit smaller units to be stacked
on top of larger units. These field-fabricated rails can be used to stack all condensers except the 38AN and
Heat Pumps.
Snow or Ice Stands:
Snow or Ice Stands raise the unit above snow and ice surfaces to permit normal air
circulation, condensate drainage, and maintenance clearance in areas where prolonged subfreezing
temperatures or heavy snowfalls are common. For drawings contact your Carrier Representative.
Wind Baffles:
The wind baffle is a field fabricated sheet metal wrapper used to provide improved unit
operation during high winds and is recommended whenever the low ambient accessory is used.
Wall Mount:
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. For drawings contact your Carrier Representative.
Indoor Guard:
The Indoor Guard is a decorative wire guard for the under ceiling (40QAB) fan coil. The
guard mounts over the fan coil discharge to prevent objects from entering the unit and air swing.
Electronic Programmable Thermostats:
Electronic Thermostats are available for cassettes and under
ceiling fan coils. There are three thermostats available for the Duct Free Line. Flat Stat, Slim Line, and a
5-1-1 programmable. The integral subbase provides 3-speed fan switchover capability, auto-change over,
and non-volatile memory. (no battery required) MORE ON NEXT PAGE