TCL Air Conditioner Service Manual
19
(5) Defrost
Defrosting of the outdoor heat exchange is controlled by the microprocessor with detection by the defrost
sensor.
Defrost starting conditions
When the conditions of a) or b) is satisfy, the defrosting operation starts.
a) Under the heating operation, the compressor cumulative operation time exceeds 50 minutes and the
temperature of the outdoor defrost sensor reads lower than －8
℃
b) Under the heating operation, the compressor cumulative operation time exceeds 50 minutes, if the
indoor pipe temperature sensor reads lower than 40
℃ continuously for 2minutes.
Note: If haven’t the outdoor pipe temperature sensor that use the condition b) to defrost, against
use the condition a).
Defrost terminating conditions
When the condition c) or d) is satisfy, the defrosting operation stops.
c) The outdoor defrost sensor reads 15
℃ or more.
d) The defrosting time exceeds 10 minutes.
Defrosting time chart
Outdoor Fan ON OFF ON
Revering Valve ON OFF ON
Compressor Relay ON OFF ON OFF ON
39S 5S Defrost Count MAX 12min 19S 15S t
(6) Assistant Thermistor Function
Assistant thermistor is add the thermitor of the electricity to rise the heating capacity automatically not
effected by the signal of the remote controller about assistant thermistor ON/OFF buttons.
1) When the condition all of A~G are satisfy, the assistant thermistor opens.
A. Under the heating operation, the compressor operates over than 3 minutes.
B. The indoor fan operates in normal.
C. The system operates not in defrosting.
D. The assistant thermistor turn off over than 30 seconds.
E. The set temperature is 3
℃ or more than the room temperature.
F. The room temperature sensor reads less than 22
℃.
G.
The indoor pipe temperature reads 43℃ or less.
2) When one of the conditions of A~E is satisfy, the assistant thermistor is off.
A. The compressor is turned off.
B. The room temperature sensor reads 24℃ or more.
C.
The indoor pipe temperature sensor reads 48℃ or more.
D.
The indoor fan is stopped.
6. “FAN” mode operation
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