33
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.
●
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
➔
ON
●
Thermo. OFF: When the room temperature is equal to or below set temperature T + 2°F.
Compressor
➔
OFF
3 minutes
3 minutes
Thermo.
OFF
Thermo.
ON
Thermo.
OFF
Thermo.
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
Set temp.
T+2
°
F
T+1
°
F
113
°
F
(45
°
C)
90
°
F
(32
°
C)
Compressor
Indoor fan
Combustion
Indoor heat exch.
coil temp.
Operation button
More than
3 minutes
More than
3 minutes
LL
LL
Reversing
valve coil
30
sec.
30
sec.
Set speed
Set
speed
