■
Heating
●
Room temperature control is obtained by cycling the compressor ON and OFF under control of the room
temperature 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 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
3 minutes
3 minutes
3 minutes
3 minutes
3 minutes
3 minutes
5 minutes
5 minutes
ON
OFF
ON
OFF
Compressor
OFF
ON
OFF
ON
OFF
Outdoor fan
OFF
Set speed
LL
LL
ON
OFF
OFF
OFF
ON
OFF
ON
OFF
OFF
ON
ON
（
Reversing cycle
）
Thermo.
ON
Thermo.
OFF
Thermo.
ON
Thermo.
OFF
More than
5 minutes
Signal from remote control unit
T °C
T–1 °C
T–2 °C
set temp.
Indoor fan
Standby lamp
Indoor heat exch.
coil temp.
36 °C
Solenoid coil
(4 – way valve)
Operation button
Room temp.
Set speed
30 seconds
30 seconds
Max. 10minutes
OFF
18
