Haier AU282FHAIA [81/139] Commercial air conditione

Haier AU52NFIAKA [81/139] Commercial air conditione
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:
TE is over 7 for 60 seconds in all or is up to 12, defrosting is over;
Defrosting accumulative time is up to 10 minutes, defrosting is over.
5
Electric
heater
control
1. When TA27, if the compressor stops running, electric heater will be electrified;
2. When TA27, or when compressor starts up, electric heater will be off; and temp.
difference is 5.
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 (TCTSTE)min. value-13 SV1
open, temp. difference is 3.
7
Spray
valve SV2
control
Adjust the SV2 according to the discharging temperature:
when TD115, SV2 will open; when TD110, SV2 will close.
High pressure switch protection:
When input level of pressure switch is 1, it shows there is no protection.
When 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:
When input level of pressure switch is 1, it shows there is no protection.
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.
In defrosting and in 6 minutes after defrosting is over, low pressure switch will be
shielded.
Commercial Air Conditioner
Model: AU28/342FHAIA,
AU522FIAKA, AU52,60NFIAKA
-78-

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