Carrier 38AN - Manual (Page 16)

will stop 30 seconds after the compressor stops. After
3 minutes, the indoor fan runs at ultra-low speed for
30 seconds. The normal dehumidification operation is re­
peated for the newly sensed room temperature.
3. When the room temperature is equal to or greater than
4® F below the selected temperature, the system operates
as follows: The compressor and outdoor fan operate for
3 minutes. The indoor fan will operate at ultra-low speed
and will stop 30 seconds after the compressor stops. Af­
ter 4 or 5 minutes, the indoor fan starts in ultra-low speed
for 30 seconds. The normal dehumidification operation is
repeated for the newly sensed room temperature. If the
room temperature is still 4° F below the selected tem­
perature, the compressor, outdoor fan, and indoor fan re­
main off. After
IVi minutes, the indoor fan operates at
ultra-low speed for 30 seconds. The normal dehumidifi­
cation operation is repeated for the newly sensed room
temperature.
• Heat Pump Heating Mode (Heat Pump Systems Only) —
When the Heat Pump mode is selected, the indoor fan will
operate at the selected speed if the speed is high, medium,
or low, unless overridden by the coil temperature (to pre­
vent cold drafts). If the indoor fan is in Auto, mode, the
fan will change operating speeds depending on the differ­
ence between the room temperature, the set point, and the
coil temperature. The reversing valve will be deenergized.
The compressor cannot run for 3 minutes from the time
the system starts up or for 3 minutes from the time it last
operated. When the temperature of the room is 8° F below
the selected temperature, the unit will operate in Heat Pump
mode until the temperature is 6° F above the selected tem­
perature, or the compressor runs for 40 minutes (which­
ever comes first). If the temperature of the room is less
than 7® F below or equal to the selected temperature, the
unit operates in Heat Pump mode until the selected set point
temperature plus 2° F is reached.
• Electric Heat in Heat Pump Heating Mode (40QNH012
Heat Pump Unit Only) — Supplemental electric heat is
enabled when the outside-air thermistor located in the out­
door unit is below 40 F and the room temperature ther­
mistor is equal to or less than 5.4° F below set point. Elec­
tric heat will remain on until 1.8° F above set point, then
will turn off. Fan operation will be the same as described
previously in the heat pump heating mode.
NOTE: Electric heat control cannot be overridden.
• Demand Defrost Mode (Heat Pump Systems Only) — This
unit uses a demand defrost system to remove frost from
the outdoor coil during heating operation. The indoor and
outdoor fans are shut off during Defrost mode. See
Fig. 16. For 40QNH imits, the electric heat is off during
Defrost mode.
■ Sleep Mode — The Sleep mode timer turns the unit off
when the timer reaches zero minutes. The durations that
can be selected are 1, 2, 3, or 7 hours. After the initial
30 minutes, the user set point shifts approximtely 1 ° F warmer.
This sequence repeats itself every 40 minutes up to a total
of 150 minutes. When Sleep mode is enabled, the display
on the remote controller is dimmed.
• ON/OFF Timer Mode — The ON/OFF timer will turn the
unit on or off at a user selectable on and off time (this is
one time event only). The unit will start in the same mode
and at the same selected temperature as when the system
shut off. If the room temperature is not within approxi­
mately 5° F of the set point 40 minutes before start-up, the
unit runs before the user selected on time is reached to
achieve the set point temperature at start-up.
• Automatic Operation Mode for Cooling Only Systems —
The unit samples the air in the room. Based on the room
temperature, the unit selects one of the following modes:
1. Cooling Mode — If the room temperature is more than
82.4 F with a preset temperature of 78.8 F.
2. Dry Mode — If the room temperature is more than
75.2 F and less than 82.4 F with a preset temperature
of 77 F.
3. Fan Only Mode — If the room temperature is less than
75.2 F.
The preset temperature can be changed by ±4° F using the
remote control.
• Automatic Operation Mode for Heat Pump Systems — The
operation mode will be determined after 20 seconds of room
monitoring (to determine the room temperature and the
outdoor-air temperature).
• Test Mode — The Test mode can be selected by setting
the slide switch on the fan coil unit to TEST position. The
slide switch is located on the front of the unit as shown in
Fig. 17, The fan coil unit will start immediately (there is
no compressor time delay when using Test mode) in Cool­
ing mode with an infinitely low set point. The indoor fan
speed will be at the high setting, and the swing louvers
will be on (moving up and down).
NOTE; The unit cannot be controlled by the remote con­
troller until the slide switch is returned to the REMOTE
position.
• Emergency Mode — This mode is only to be used if the
remote controller is lost, damaged, or the batteries are dis-
chaiged. To initiate emergency mode, manually move the
slide switch on the fan coil unit to the EMER position
(Fig. 17). The unit is automatically operated in cooling or
heating (40QNE/H units only) mode according to room
temperature. Emergency operation settings are as follows:
1. Operation mode: AUTO.
2, Fan speed: AUTO.
3. Cooling set point: 77 F
4, Timer mode: Continuous
NOTE: The unit cannot be controlled by the remote con­
troller until the slide switch is returned to the REMOTE
position.
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