Haier AB092XCERA, Service Manual, Page: 93 / 143

not go down greatly.
Ambient temp. TA
≤
27degree, when compressor stops, the electric heater will be electrified.
When TA
≥
32degree, or compressor running, the electric heater will be off.
Heater ON
OFF
Ambient temp. TA(
℃
) 27 32
3.6 Control of liquid spray valve SV2:
According to the compressor discharging temp., open or close the SV2.
①
Control condition:
A. In every mode (including defrosting and oil return operation), the control can work.
B. In 3 minutes after compressor startup, ignore the abnormal compressor suction and discharging value.
②
3 minutes later after compressor startup, according to the discharging temp., the following procedure
will be taken:
Td
≤
90
℃
, SV2 close;
Td
＞
110
℃
, SV2 open.
③
In 150 seconds when compressor stops, in order to keep the system in balanc, please open the liquid
spray valve SV2. 150 seconds later after compressor stops, SV2 close.
3.7 Control of defrosting in heating
In heating mode, defrosting temp. sensor will check the frosting condition of outdoor heat exchanger and
make defrosting control.
3.7.1 Enter condition:
①
In heating mode, if the compressor has run for 10 minutes continously and run for 45 minutes in all, the
system will measure the defrosting temperature sensor Te and outdoor ambient temp. sensor TA, if the
below condition can be met for continous 5 minutes, the unit will enter defrosting operation:
Te
≤
C
×
TA
－α
Herein: C
：
TA
＜
0
℃，
C=0.8 TA
≥
0
℃，
C=0.6
According to SW2, the setting is as follow: in the place easy to frost, it is H; when out of factory, it is M.
Jumper
selection
M(out of factory) H
α
(
℃
) 8(E) 6(E)
②
Defrosting entering condition: -15
℃≤
C
×
TA
－α≤
-2
℃
③
Stop and Pause condition of compressor running accumulative time in heating mode:
Checking Stop: running operation changes from heating to cooling.
Checking Pause: thermostat OFF, or the unit stops.
3.7.2 Cancel condition:
It will take the max. 10 minutes from beginning defrosting to quit it. Te sensor will measure the condition of
outdoor heat exchanger, if the temp. is over 7
℃
for 60 seconds in all or is up to 12
℃
for 30 seconds in all,
the defrosting will be over.
3.7.3 Compulsory defrosting control
Enter condition: in heating mode, after receiving the compulsory defrosting signal from indoor unit, the unit
will perform the compulsory defrosting operation.
Cancel condition: Te
≥
12
℃
and keep for 1 minute or the defrosting time is over 10 minutes.
The manual defrosting signal of indoor unit will remain until the outdoor enters defrosting mode.
Note: When outdoor compressor not running, the unti still can enter manual defrosting, but it will comply
with the 3-minute protection of compressor.
-9
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