Service manual

24
Heating
• The control circuit will not attempt to turn the compressor ON until the compressor has been OFF for at
least 5 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 5 minutes or more of
compressor operation.
• Thermo ON: when the room temperature is below T -1°C (T°C is set temperature).
Compressor ➔ ON.
• Thermo OFF: when the room temperature is equal to or above set temperature T°C.
Compressor ➔ OFF.
OFF
SET TEMP.
MORE THAN
5 MINUTES
ROOM TEMP.
THERMO
OFF
THERMO
ON
THERMO
OFF
5 MINUTES
ON ON
OFFOFF
OFF
ON ON
OFFOFF
OFF
LL
SET SPEED
LL
SET SPEED
LL
30 SECONDS
30 SECONDS
OFF
ON
OFF
ON
OFF
ON
❆ ❆
OFF
ON
ON (REVERSING CYCLE)
T°C
T-0.5°C
COMPRESSOR
OUTDOOR
FAN
INDOOR
FAN
STANDBY LAMP
INDOOR HEAT
EXCH. COIL
TEMP. 35°C
25°C
SOLENOID COIL
(4-WAY VALVE)
OPERATION
BUTTON
L L = Low low speed
COLD DRAFT PREVENTION
❆
❆
OFF
5 MINUTES