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8-2. Cooling
8-2-1. Room Temperature Control
● Room temperature control is obtained by cycling the compressor ON and OFF under control of the room
temperature sensor in the indoor unit.
● All information is transmitted every 3 minutes by the remote control unit to the controller in the indoor unit.
● The control circuit will not attempt to turn the compressor ON until the compressor has been OFF for at
least 3 minutes. To protect the compressor from stalling out when trying to start against the high side
refrigerant pressure, the control circuit has a built-in automatic time delay to allow the internal pressure to
equalize.
● As a protective measure, the control circuit switches the compressor OFF after 3 minutes or more of com-
pressor operation.
● Thermo. ON: When the room temperature is above T°F (T°F is set temperature).
Compressor ➔ ON
● Thermo. OFF: When the room temperature is equal to or below set temperature T – 1°F.
Compressor ➔ OFF
3 minutes 3 minutes 3 minutes
Set temp.
T°F
T – 1°F
Compressor
More than
3 minutes
Set speed
OFF OFF
OFF OFF
Outdoor fan
Indoor fan
Thermo.
OFF
Thermo.
ON
Thermo.
OFF
Thermo.
ON