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In heating operation, if air conditioner turn off, the indoor fan motor will run most for 30
seconds since the stop of compressor.
2) Auto fan control (heating)
In heating mode (include in "feel" mode) , fan speed is determined by
RT-ST
℃
4.0
3.0
1.5
1.0
(3) 4-way valve control
In heating mode, 4-way valve will power on ahead of compressor for 8 seconds, and cut off
for 2 minutes later than compressor. 4-way valve will not power off unless the machine to be
switched off, mode changed or on the process of defrosting.
4-WAY valve
Outdoor fan motor
Compressor
(4) Outdoor fan motor control
In heating mode, the outdoor fan motor will power on ahead of compressor 5 seconds, and
cut off for 30seconds later than compressor.
Outdoor fan motor
Compressor
(5) Defrosting
Defrosting is controlled by the microprocessor.
When the unit operate 30 minutes accumulated and the compressor operation more than 3
minutes continuously, one of the following conditions is satisfied, unit comes into defrosting:
a. When FrostDeg ≥ -5℃, and OPT ≤ -5℃, the .2 times defrosting interval time is 45 minutes.
b. When -10℃≤ FrostDeg < -5℃, and OPT < FrostDeg , the .2 times defrosting interval time is
45 minutes.
Air Conditioner Service Manual
Indoor pipe Temperature
Temperature up
℃
Setting
37
℃
Low fan
33
Breeze
℃
25
Stop
δt come up
δt come down
High fan
Min fan
Low fan
ON
OFF
ON
OFF
ON
OFF
3S
5S
ON
OFF
ON
OFF
5S
℃
33
℃
25
℃
20
Temperature down
30S
120S
30S
t as the following:
δ
7
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