Function; Room Temperature Control - Technibel MCAV72C5TA Series Technical Data & Service Manual

5. FUNCTION

5-1. Room Temperature Control

■ Cooling
● 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 5 minutes by the remote control unit to the
controller in the indoor unit.
5 minutes
T+1 °C
T °C
set temp.
More than
5 minutes
Compressor
Outdoor fan
Indoor fan
● 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 compressor
operation.
● Thermo. ON : When the room temperature is above T + 1°C (T°C is set temperature).
Compressor ➞ ON
● Thermo. OFF : When the room temperature is equal to or below set temperature T°C.
Compressor ➞ OFF
Signal from remote control unit
5 minutes 5 minutes
Thermo. Thermo.
OFF ON
5 minutes
ON OFF
3 seconds 3 seconds 3 seconds
ON OFF
5 minutes 5 minutes
Thermo. Thermo.
OFF ON
3 minutes
ON OFF
ON OFF
Set speed
16
5 minutes 5 minutes
Thermo. Thermo.
ON ON
Room temp.
ON
3 seconds
ON
Thermo.
OFF
OFF
OFF