Function; Room Temperature Control; Function 8-1. Room Temperature Control - Sanyo CH0951 Technical & Service Manual

8. FUNCTION

8-1. Room Temperature Control

Cooling
Room temperature control is obtained by cycling the compressor ON and OFF under control of the room tem-
perature 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 + 2 ¡F
T ¡F
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 pres-
sure, 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 + 2°F (T°C 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
Thermo. Thermo. Thermo.
OFF ON OFF
5 minutes
OFF ON
OFF ON
Set speed
ON
OFF
47
Thermo. Thermo.
ON ON
3 minutes
Room temp.
OFF ON
OFF ON
Thermo. Thermo.
ON OFF
OFF
OFF