Function; Room Temperature Control; Function 8-1. Room Temperature Control - Sanyo C0951 Technical & Service Manual

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.
T+2 F
Set temp. T F
Compressor
Outdoor fan
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 com-
pressor operation.
Thermo ON : When the room temperature is above T + 2°F (T°F is set temperature).
Compressor
Thermo OFF : When the room temperature is equal to or below set temperature T°F.
Compressor
Signal from remote control unit
3 minutes 3 minutes 3 minutes
Thermo Thermo
OFF ON
More than
5 minutes
ON OFF
ON OFF
ON
OFF
3 minutes 3 minutes
Thermo Thermo
OFF ON
5 minutes 3 minutes
ON OFF
ON OFF
Set speed
41
3 minutes 3 minutes
Thermo Thermo Thermo
ON ON OFF
Room temp.
ON OFF
ON OFF