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8. FUNCTION
8-1. Room Temperature Control
● Room temperature control is obtained by cycling the compressor ON and OFF under control of the room
temperature sensor in the 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 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 5 minutes or more of com-
pressor operation.
● Thermo ON : When the room temperature is above T + 2°F (T°F is set temperature).
Compressor → ON
● Thermo OFF : When the room temperature is equal to or below set temperature T°F.
Compressor → OFF
Set temp.
T+2°F
Signal from remote control unit
Room temp.
More than
5 minutes
Thermo
OFF
Indoor fan
Outdoor fan
Compressor
Set speed
ONONON OFF OFF OFF
ON OFFON ONOFF OFF
3 minutes5 minutes
3 minutes 3 minutes 3 minutes 3 minutes 3 minutes 3 minutes 3 minutes
Thermo
ON
Thermo
OFF
Thermo
ON
Thermo
ON
Thermo
ON
Thermo
OFF
T°F
000-215 SM (1-56) 7/5/00 2:49 PM Page 41