Function; Room Temperature Control; Function 9-1. Room Temperature Control - Sanyo SAP–K91A Technical & Service Manual

9. FUNCTION

9-1. Room Temperature Control

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+1 °C
T °C
set temp.
More than
5 minutes
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 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 + 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.
OFF ON
ON OFF
ON OFF
ON
OFF
Thermo. Thermo.
OFF ON
5 minutes 3 minutes
ON OFF
ON OFF
Set speed
19
Thermo. Thermo. Thermo.
ON ON OFF
Room temp.
ON OFF
ON OFF