Product data

• Maximum Dehumidification Mode — When the dehumidification mode is selected, the indoor fan will operate
continuously at the selected speed if the speed is high, medium, or low. If the indoor fan is in auto mode, the fan
changes operating speeds depending on the room temperature. If the room temperature is below the set point, the
indoor fan runs at ultra-low speed, and the compressor could run for up to 4 minutes. (Ultra-low speed is a control-
driven speed [not user configurable] used to sample the space when the fan would normally be off.) The reversing
valve will be on for 40QNE018, 024 units or off for 40QNE009, 012 units. The compressor cannot run for 3 minutes
from the time the system starts up or for 3 minutes from the time the compressor last operated.
Initial Operation — When the mode is first selected, one of the following occurs:
1. If the room temperature is above or equal to the selected temperature, the unit operates for 16 minutes and the
compressor and outdoor fan operate. The indoor fan will operate as in the cooling mode. After 16 minutes of
operation (or when the room reaches 2° F below set point), the unit switches to normal dehumidification operation.
2. If the room temperature is below the selected temperature, the unit operates for 8 minutes as follows: The
compressor and outdoor 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 starts in ultra-low
speed for 30 seconds. The unit then switches to normal dehumidification operation.
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 outdoor fan operate for 3 minutes. The in-door 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 minutes. 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, outdoor fan, and indoor fan remain off.
After 7 ½
minutes, the indoor 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 in-door
fan is in auto mode, the fan changes operating speeds depending on the difference between the room temperature,
the set point, and the coil temperature. The reversing valve will be off for 40QNE018, 024 units or on for
40QNE009, 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 minutes (whichever 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.
• 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
Electronic Control Defrost Regions Map Fig #2 for defrost region details.
• Sleep Mode — The sleep mode timer turns the unit off when the timer reaches zero minutes. The duration’s 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. MORE ON NEXT PAGE