Specifications

CONTROLS — SYSTEMS USING HIGH WALL FAN COILS (cont)
Normal Operation — One of the following will take place:
1. When the temperature of the room is equal to or greater than
the selected temperature (by not more than 3° F), the unit
operates for 8 minutes as follows: The compressor and out-
door fan operate for 3 minutes. The indoor fan operates in
low speed, and 30 seconds after the compressor stops, the
indoor fan stops. The unit remains off for 1 minute, and then
the indoor fan runs at ultra-low speed for 30 seconds. The
normal dehumidification operation is repeated for the newly
sensed room temperature.
2. If the room temperature is equal to or greater than the
selected temperature, but not by more than between
4° F and 6° F, the compressor and outdoor fan operate
for 4 minutes. The indoor fan runs at ultra-low speed and 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 repeated for the newly
sensed room temperature.
3. When the room temperature is equal to or more than 4° F
below the selected temperature, the system operates as
follows: The compressor and outdoor fan operate for 3 min-
utes. The indoor fan operates at ultra-low speed and will stop
30 seconds after the compressor stops. After 4 or 5 minutes,
the indoor fan starts at 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 temperature, the compressor, out-
door fan, and indoor fan remain off. After 7
1
⁄ 2 minutes, the in-
door fan operates at ultra-low speed for 30 seconds. The
normal dehumidification operation is repeated for the newly
sensed room temperature.
• Heat Pump Heating Mode — When the heat pump mode is
selected, the indoor fan operates at the selected speed if
the speed is high, medium, or low, unless overridden by
the coil temperature (to prevent cold drafts). If the indoor
fan is in auto mode, the fan changes operating speeds de-
pending on the difference between the room temperature,
the set point, and the coil temperature. The reversing valve
will be off for 619E018,024 units or on for 619E009,012
units. 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 temperature or the compressor runs for 40 min-
utes (whichever comes first). If the temperature of the
room is less than 7° F below or equal to the selected tem-
perature, the unit operates in heat pump mode until the se-
lected set point temperature plus 2° F is reached.
• 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 Elec-
tronic Control Defrost Regions Map on page 79 for defrost
region details.
• 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 approximately 1° F
warmer. This sequence repeats itself every 40 minutes up
to a total of 150 minutes.
When is sleep mode, the display on the remote controller
is dimmed.
• Awake Mode — The awake timer will turn the unit on when
the timer reaches zero minutes. 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 approximately 5° F of the set point 40 minutes be-
fore start-up, the unit runs before the awake timer reaches
zero to achieve the set point temperature at start-up.
• Automatic Operation Mode for Heat Pump Systems
(538D) — 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. The fan coil unit
will start immediately (there is no compressor time delay
when using test mode) in cooling mode with an infinitely
low set point. The indoor fan speed will be at the high set-
ting, 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 re-
mote controller is lost, damaged, or the batteries are dis-
charged. To initiate emergency mode, manually move the
slide switch on the fan coil unit to the EMER position. The
unit is automatically operated in cooling or heating mode
according to room temperature. Emergency operation set-
tings 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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