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7-3. Automatic Switching between Cooling and Heating
●
When AUTO mode is selected, the microprocessor calculates the difference between the set temperature and
the room temperature, and automatically switches to COOLING or HEATING mode to maintain the desired
temperature.
Room temp.
≥
Set temp.
➞
COOL
Room temp. < Set temp.
➞
HEAT
This means that if the room temperature is higher than or equal to the set temperature, COOLING operation
begins. If the room temperature is lower than the set temperature, HEATING operation begins.
7-4. Freeze Prevention (Cooling)
●
This function prevents freezing of the indoor heat exchange coil.
●
When the compressor has been running for 10 minutes or more and the temperature of the indoor heat
exchange coil falls below –1°C, the control circuit stops the compressor for at least 6 minutes. The compressor
does not start again until the temperature rises above 8°C or 6 minutes has elapsed.
ON
ON
ON
ON
OFF
OFF
Set speed
More than
10 minutes
6 minutes
T+1 ° C
Indoor heat exch.
coil temp.
–1 ° C
Compressor
Indoor fan
Room temp.
Thermo. OFF
Thermo. ON
Set temp. T ° C
More than
10 minutes
More than
6 minutes
Set speed
