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TCL Air Conditioner Service Manual
8
(5) Defrost
Defrosting of the outdoor heat exchange is controlled by the microprocessor with detection by the indoor
pipe temperature sensor.
Defrost control type is according to the JC on the PCB whether is connected.
When the JC is connect on the PCB
When one of the conditions of A, Band C is satisfy, the defrosting operation stars.
A. IPT--- indoor pipe temperature
In the condition A, it must satisfy the conditions a), b)and c) then into defrosting operation.
a) IPT1 satisfy IPT1=IPT
MAX
IPT
b) t5 50minutes(the compressor cumulative operation time 50 minutes, t5 is permitted move
and lower than t1 too).
c)
IPT104and keep 2 minutes.
According to the condition A enter the defrosting operation, the first defrosting operation time is
8
minutes; After defrosting operation one cycle, and then judge and regulate the defrosting operation
time.
B. After the compressor cumulative operation time exceeds 120 minutes and the temperature of the IPT
is less than
for 2 minutes. When the defrosting operation time on this condition exceeds
8 minutes, it will terminate.
C. After the compressor operates continuously for 20 minutes and the IPT is less than 73.4 or from
the last time of defrosting operation is 50 minutes or more interval. When the defrosting operation
time on this condition exceeds 10 minutes, it will terminate.
When the JC isn’t connected on the PCB
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 pipe temperature sensor reads lower than
b) Under the heating operation, the compressor cumulative operation time exceeds 50 minutes, if the
indoor pipe temperature sensor reads lower than
104
continuously for 2 minutes.
Note: If haven’t the outdoor pipe temperature sensor that uses the condition b) to defrost, against
use the condition a).
Defrost terminating conditions
When the condition c) or d) is satisfy, the defrosting operation will termin
ate.
c) The outdoor defrost sensor reads
68
or more.
d) The defrosting time exceeds 10 minutes.
℉)