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8. FUNCTION
8-1. Room Temperature Control
Room temperature control is obtained by cycling the compressor ON and OFF under control of the room
temperature sensor in the remote control unit.
The room temperature (and other information) is transmitted every 3 minutes by the remote control unit to the
controller in the indoor unit.
3 minutes 3 minutes 3 minutes 3 minutes 3 minutes 3 minutes 3 minutes
T+1 °C
T °C
set temp.
More than
5 minutes
Compressor
ON
Outdoor fan
ON
Indoor fan
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 5 minutes or more of compressor
operation.
Thermo. ON : When the room temperature is above T + 1°C (T°C is set temperature).
Compressor
Thermo. OFF : When the room temperature is equal to or below set temperature T°C.
Compressor
Signal from remote control unit
Thermo.
Thermo.
Thermo.
OFF
ON
OFF
5 minutes
OFF
ON
OFF
ON
Set speed
ON
OFF
40
Thermo.
Thermo.
ON
ON
3 minutes
Room temp.
OFF
ON
OFF
ON
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Thermo.
Thermo.
ON
OFF
OFF
OFF
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