Sanyo CH0951, Technical & Service Manual

Page: 51 / 98

47
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.
●
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
➞
ON
●
Thermo. OFF : When the room temperature is equal to or below set temperature T°F.
Compressor
➞
OFF
3 minutes 3 minutes 3 minutes 3 minutes 3 minutes 3 minutes 3 minutes
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 + 2
¡
F
T
¡
F set temp.
Thermo.
OFF Thermo.
OFF Thermo.
ON Thermo.
OFF Thermo.
ON Thermo.
ON Thermo.
ON
Room temp.
Signal from remote control unit
000-111 SM (18-68) 00.3.17 11:49 AM y [ W 47