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TD55ć, +1 degree / 2 minutes, and plus to 0 degree gradually
Heating
Td35ćˈ+1 degree / 2 minutes
35ć Td40ć, keep the angle
TD˚40ć, -1 degree / 2 minutes, and reduce to 0 degree gradually
Max. +5
7.2.4 4-way valve control
z The 4-way valve control in defrosting: refer to the defrosting procedure.
z 4-way valve control in other modes:
In heating mode, 4-way valve will open in 10 seconds before compressor starts up. When
compressor not startup or in non-heating mode, 4-way valve will close to ensure the compressor
has stopped for at least 2 minutes.
7.2.5 Outdoor defrosting control
A. Enter condition
In heating mode, compressor is running for 10 minutes contineously, or has run for 45 minutes
in all (when defrosting is over or entering the cooling mode, the counter will be cleared), by
measuring the defrosting sensor TE and outdoor ambient temp. sensor TA, if for 2 minutes the below
conditions can be met contineously, system will enter defrosting mode:
TEİChTAˉ¢
Here in: C: TA˘0ć, C=0.8
TAı0ć, C=0.6
Selct¢as follow according to the data of EEPROM:
Connection choosing L M H
¢(ć)
10 7 6
Easy to deforst: select H, uneasy to deforst: select L, set in M when out of the factory.
Entering defrost temperature: -15ćİChTAˉ¢İ-5ć
B. Defrost interval time
z When the value of ChTAˉ¢ is in the range of -15ćİChTAˉ¢, two defrosting interval is
45 minutes.
z When the value of ChTAˉ¢ is in the range of ChTAˉ¢<-15ć, two defrosting interval is
65 minutes.
C. Defrost procedure
At the beginning of defrost, compressor will firstly stop for 1 mintue, outdoor fan runs, and 50
seconds later, 4-way valve is OFF.
When compressor starts up, outdoor motor stops, compressor stay at 60Hz for 60 seconds,
then compressor frequency will go up to the target frequency 88Hz.
In defrosting, the compressor current, compressor discharging protections are valid. If in
defrosting, compressor stops because of the protection or the failure, 3 minutes later, it will resume,
and if it still in defrosting time, the unit will still defrost. The compressor will start up due to the
principle of startup in defrosting. If contineously the compressor can not start up for 3 times, the unit
will deal with the malfunction and quit the defrosting. If in defrosting there is failure, the failure time
will not be included in the defrosting time.
In defrosting, only after the compressor min. running time is over 2 minutes, the system can
quit the defrosting.
D. Quit condition
In any of the below conditions can be met, the defrosting mode will turn into heating operation.
(1): Outdoor heat exchanger temperature is over 10ć for 80 seconds contineously.
(2): Outdoor heat exchanger temperature is over 14ć for 20 seconds contineously.
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