4. FUNCTIONS
4-1 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 5 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 not before than 5 minutes
of compressor operation.
Thermo. ON :
When the room temperature is above T + 1°C (T°C is set temperature).
Compressor ON
Thermo. OFF :
When the room temperature is equal to or below set temperature T°C.
Compressor OFF
3 minutes
5 minutes
ON
OFF
ON
OFF
ON
OFF
Compressor
ON
OFF
ON
OFF
ON
OFF
More than
5 minutes
Outdoor fan
Indoor fan
Set speed
T+1
°
C
T
°
C
set temp.
Thermo.
OFF
Thermo.
OFF
Thermo.
ON
Thermo.
OFF
Thermo.
ON
Thermo.
ON
Thermo.
ON
Room temp.
5 minutes
5 minutes
5 minutes
5 minutes
5 minutes
5 minutes
5 minutes
Signal from remote control unit
3 seconds
3 seconds
3 seconds
3 seconds
15
