5. FUNCTION
5-1 Room Temperature Control
Room temperature control is obtained by cycling the compressor ON and OFF by means of room
temperature sensor TH1
minimum
3 minutes
ON/OFF SWITCH
COMPRESSOR
SWITCH
COMPRESSOR ON
SET
TEMPERATURE +1°C
SET
TEMPERATURE
FAN
SET SPEED
NOTES
1. If the compressor is turned off, the control circuit sets an automatic minimum 3 minutes delay to protect
the compressor from stalling out when trying to start against the high side refrigerant pressure.
2. If the room temperature is 1°C above the set temperature, the compressor starts working if this has been
OFF for at least 3 minutes.
3. If the room temperature is the same or under the set temperature the compressor stops working.
5-2 Heat Exchanger Frosting Prevention
The electronic control stops automatically the compressor each time the coil sensor TH1 reaches a
temperature of 1 °C for 8÷10 minutes long, the compressor starts again automatically when the
temperature of heat exchanger reaches 8 °C. the fan goes "ON" working at the set speed.
minimum minimum
10 minutes 3 minutes
ON/OFF SWITCH
COMPRESSOR
SWITCH
COMPRESSOR
HEAT EXCHANGER
TEMP. = 8°C
HEAT EXCHANGER
TEMP. = 1°C
FAN
SET SPEED
ON
ON ON
ON
ON
ON
ON
9
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