Haier AE122FCBKA [73/126] Commercial air conditione

Haier AB092FCBIA [73/126] Commercial air conditione
Commercial Air Conditioner Model: AU242FHBIA,
AU482FIBIA, AU48NFIBJA
2. Defrosting control:
When defrosting condition is met, compressor frequency will go down to the min.
frequency, and 4-way valve will be powered off and turn into cooling mode (fan motor off,
EEV in soft startup open angle); compressor frequency rises up to 78Hz and begins to
defrosting operation.
3. Quit condition:
ƽTE is over 7ć for 60 seconds in all or is up to 12ć, defrosting is over;
ƽDefrosting accumulative time is up to 10 minutes, defrosting is over.
5
Electric
heater
control
1. When TAİ27ć, if the compressor stops running, electric heater will be electrified;
2. When TAı27ć, or when compressor starts up, electric heater will be off; and temp.
difference is 5ć.
6
Unloading
valve SV1
control
1. To balance pressure: it will open 1 minute before compressor starts up, and keep open
in soft startup period after compressor starts up until the soft startup is over; in the
remaining operation and 10 minutes later after shutoff, SV1 will open;
2. Improve low pressure: in heating mode, when (TCǃTSǃTE)min. valueİ-13ć SV1
open, temp. difference is 3ć.
7
Spray
valve SV2
control
Adjust the SV2 according to the discharging temperature:
when TDı115ć, SV2 will open; when TDİ110ć, SV2 will close.
High pressure switch protection:
ƽWhen input level of pressure switch is 1, it shows there is no protection.
ƽWhen input level of pressure switch is 0 for a while, it shows high pressure beginning;
compressor stops and the unit alarms. The alarm can be resumable, the unit will alarm in
3 minutes when compressor is standby.
8
Pressure
switch
control
Low pressure switch protection:
ƽWhen input level of pressure switch is 1, it shows there is no protection.
ƽ When compressor is running, if low pressure switch has acted for 3 minutes
continuously, the unit will alarm. When compressor stops, if low pressure switch has acted
for 30 seconds continuously, the unit will alarm. When compressor starts up, low pressure
switch will be shielded within 3 minutes.
ƽIn defrosting and in 6 minutes after defrosting is over, low pressure switch will be
shielded.
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