Carrier 52C Series - OPERATING CONTROLS; OPERATING MODES

10
OPERATING CONTROLS
The following controls are located on the front of the
control box door, under front panel. To obtain access to
operating controls, remove the unit front panel as
shown on page 2. See Figure 18.
■ FAN CYCLE SWITCH — (Typically available at
wall thermostat on RC or RP units.) This allows the
fan to operate in two modes:
CON (Continuous)
— This setting allows the fan to
run continuously, circulating air even when the tem-
perature setting has been satisfied. This switch helps
to maintain the room temperature closer to the ther-
mostat setting. Use this switch position when maxi-
mum comfort is desired. This is the factory default
setting.
CYC (Cycle)
— This setting allows the fan to cycle on
and off with the compressor during heating or cooling.
The fan stops when the temperature setting is satis-
fied. This results in longer unit off-time and wider
variations in room temperature and humidity.
■ OUTDOOR THERMOSTAT (52CQ and 52PQ HEAT
PUMP UNITS ONLY) — If the setscrew is left at the
factory setting (in the heat pump position), the unit
will operate in the reverse cycle heating mode. See
Figure 18. When the temperature of the outdoor coil
reaches 20 F (approximately 35 F outdoor air tempera-
ture), the compressor will shut down as unit is no
longer capable of adequate heating in heat pump
mode. The electric heater then becomes the primary
heating source. The electric heater remains on until
the temperature of the outdoor coil reaches 40 F; then
the electric heater is shut off and the compressor is
energized. Once the compressor is energized, the heat
pump again becomes the primary heating source.
To set unit to operate in electric heat mode only, turn
the setscrew to the electric heat position. See Figure 18.
OPERATING MODES (See Figures 19
and 20.)
■ OUTSIDE AIR — To bring outside air into occupied
space, turn the vent handle to the full open position.
See Figure 17.
■ OFF — The OFF mode terminates unit operation.
■ FAN— The FAN mode will circulate air in the space
at high speed and at high or low speed for cooling only
models.
■ HIGH HEAT OR HIGH COOL — Select mode and
rotate temperature knob to desired comfort level. This
function provides maximum heating or cooling, and is
recommended to raise or lower the room temperature
quickly.
■ LOW HEAT OR LOW COOL — Select mode and
rotate temperature knob to desired comfort level. This
function provides minimum heating or cooling with
maximum dehumidification and quietest operation.
■ FAN SPEED CONTROL FOR 52P AND 52C WALL
THERMOSTAT MODELS — For maximum comfort,
fan speed is user selectable at the unit. See Figure 20.
IMPORTANT: If setscrew on standard heat pump
unit is set to electric heat mode operation, the com-
pressor is disabled for both heating and cooling
operations. If setscrew on heat pump unit with wall
thermostat control is set to electric heat mode
operation, the compressor will be disabled only for
heating operation.
FIGURE 19 — 52P UNIT CONTROLS SHOWN
FIGURE 20 — 52P UNIT WITH
WALL THERMOSTAT CONTROL SHOWN
(Blank Plate)