HPC
Air Conditioner Service Manual
1
0
1) Compressor’s protection function:
a
．
The PCB which has Power-off memory function, once this function is started up,the compressor
goes along 3min delay protection when power on. If the PCB hasn’t been started up this function,
even when the PCB is power-on, the compressor doesn’t process 3 min delay function.
b
．
Compressor’s 3 min interval protection: the compressor can’t start-up until 3 min later(except for
defrosting process).
c
．
After the compressor started, the compressor’s state isn’t subject to the changes on ST,RT in 3min.
2) Anti-frosting protection of indoor evaporator:
If IPT
≤
0
℃
detected in consecutive 5 min, compressor and outdoor motor stoped, indoor fan motor
runs at high-speed forcibly; IPT
≥
5
℃
detected 3min later, then outdoor fan is activated. And the
compressor, indoor fan motor restores the original state.
3) Overheating protection:
IPT
≥
55
℃
, the outdoor fan stops, IPT
≥
65
℃
, the compressor stops, indoor fan motor runs at
high-speed forcibly. When IPT
≤
48
℃
, outdoor fan motor and the compressor open, indoor fan motor
restores the original state.
4) Anti-cold wind control in heating:
a. When runing into the heating mode, once the compressor fails to comply with the start-up
conditions, the wind speed is regulated according to the coil temperature in 2 min(including stopping
the indoor fan motor), 2 min later the indoor fan motor stops.If the compressor starts up within 2 min,
then operating by Figure 5.
Under heating process, to close the compressor (including the downtime protection ), the wind speed
is regulated according to the coil temperature in 1min(including stopping the indoor fan), 1min later
the fan is stoped forcibly.
b. When the indoor fan motor running at a low-speed wind and in anti-cold wind operation, once
electric heating opens,the vane immediately withdraws from the anti-cold windy location and turn
back to normal vane angle. When electric heating closes, indoor fan motor go on to run at low-speed
wind, accordingly, the vane turns to anti-cold windy location.
Figure 5 Anti-cold Wind
2) The following table shows the fault protections. When failures happens, the PCB alarms and
buzzer rings three times. Failure code appears, and the PCB operates protection procedures.
