Heating - Sanyo CG1411 Service Manual

8-3. Heating

8-3-1. Room Temperature Control
Room temperature control is obtained by cycling the compressor ON and OFF under control of the room
temperature sensor in the indoor unit.
All information is transmitted every 3 minutes by the remote control unit to the controller in the indoor unit.
Set temp.
Compressor
Combustion
Reversing
valve coil
Indoor fan
Indoor heat exch.
coil temp.
(45 C)
(32 C)
Operation button
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 3 minutes or more of com-
pressor operation.
Thermo. ON: When the room temperature is below T + 1°F (T°F is set temperature).
Compressor
Thermo. OFF: When the room temperature is equal to or below set temperature T + 2°F.
Compressor
Thermo.
ON
T+2 F
T+1 F
More than
3 minutes
3 minutes
OFF
OFF
OFF
OFF
LL
113 F
90 F
OFF
ON
OFF
Thermo.
OFF
Thermo.
ON
More than
3 minutes 3 minutes
OFF
OFF
30
sec.
Set
LL
speed
33
Thermo.
OFF
OFF
OFF
30
sec.
Set speed