Haier AD182AMERA Service Manual page 58

B. Defrost interval time
When the value of C×TA－α is in the range of -15℃≤C×TA－α, two defrosting interval is
45 minutes.
When the value of C×TA－α is in the range of C×TA－α<-15℃, 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 and compressor frequency will
go up to the target frequency 90Hz.
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.
The defrosting frequency will not limited by the running frequency, after entering defrosting,the
compressor will not stay at 60Hz and directly go to the target frequency 90Hz.
The quit condition will not change.
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 10℃ for 80 seconds contineously.
(2): Outdoor heat exchanger temperature is over 14℃ for 20 seconds contineously.
(3): Defrost operation for 10 minutes contineously.
E. If the quit condition can be met, the unit will perform:
Compressor stops, and outdoor motor runs. 50 seconds later the 4-way valve is close, then 60
seconds later, compressor will perform as startup procedure.
F. In defrosting period and in 6 minutes after defrosting, the low pressure is shielded.
G. In defrosting, if receiving the shutoff signal sent from indoor unit, outdoor unit will not deal with it
until the defrosting is over.
8.1.5 PTC output control
When outdoor unit is electrified, PTC output is 0, 10 seconds later, it is 1.
After compressor stops for 10 minutes contineously, PTC output is 0.
When getting the compressor-start signal, firstly PTC output is 1, 5 seconds later,
compressor will start up.
8.1.6 Electric heater control
When shutoff, the electric heater will be controlled by the ambient temperature: below 12℃, working;
over 17℃, stop.
When the unit switched on, electric heater will not work.
8.1.7 Time shorting function
If the time shorting port is in short circuit, the unit will perform a 1/60 time shorting control.
Commercial Air Conditioner
-58-
Model: AU182AFERA
AD182AMERA, AS182AVERA