Electrical Control Functions - Haier AU122AEERA Service Manual

9. Electrical Control Functions

9.1. Outdoor electric control functions
System main functions
Definition of sensor sign: Tnh=indoor ambient temp., Twh=outdoor ambient temp., Tpg=indoor coil,
Ttc=discharge, Tcs= outdoor coil, Txr=suction.
1.1 Outdoor running frequency and the control procedure
1.1.1 Outdoor running frequency control
Outdoor running frequency range:
Compressor max. running frequency in cooling mode:
outdoor ambient temp.
Max. running frequency Hz(E)
Compressor min. running frequency in cooling mode:
outdoor ambient temp.
Min. running frequency Hz(E)
Compressor max. running frequency in heating mode:
outdoor ambient temp.
Max. running frequency Hz(E)
Compressor min. running frequency in heating mode:
outdoor ambient temp.
Min. running frequency Hz(E)
1.1.2 Compressor startup
When compressor startup for the first time, compressor running frequency must be stay at 60Hz(E)
and 80Hz(E) for 1 minutes (At outdoor discharg temp. overhigh protection and compressor overcurrent
protection, the frequency will be reduced), and then rise up to the target frequency. After the unit is in
normal, the above procedure is not available.
1.2.3 Heating mode, cooling mode
After performing the compressor startup procedure, the unit will run according to the indoor
frequency.
2 minutes later, the unit will compensate the running frequency due to the relative condition.
1.2.4 Compressor frequency rising/reducing speed
Rapid rising/reducing frequency speed 1----1Hz/second
Slow rising/reducing frequency speed 2----1Hz/10 seconds
Slow reducing frequency speed 3----2Hz/second
1.2 Outdoor motor control
Note: When the outdoor motor needs to change the class, there will be 45-second interval to avoid
the fan speed changing frequently. 4 pulse for each circuit.
1.2.1 Fan motor speed class has 7 steps, the rotation and class is as follow:
Class-0 Class-1
250
Stop
1.2.2 Blowing remain heat after compressor shuts off
In cooling mode, when compressor shuts off, outdoor motor will enter speed Class-5 automatically,
and will shut off after blowing remaining heat for 30 seconds.
1.2.3 Outdoor motor control in cooling/dry mode
Fan motor locked rotor: When fan motor is requested to work, if fan speed is measured to be below
50RPM and keep for 10 seconds, the compressor will stop, but 3 minutes later, it will re-start up again.
If within 10 minutes, the condition occurs 3 times, the unit will stop and alarm.
When compressor starts up, the unit will adjust automatically in 3 minutes according to the outdoor
Commercial Air Conditioner
~15
60
~38
16
~0
120
~10
30
Class-2 Class-3
400 550
Model: AU122AEERA AB122ACERA
AC122ACERA AD122ALERA
15~38
100
38~
16
0~15
100
10~
30
Class-4 Class-5
650 850
38~
80
15~
80
Class-6 Class-7
900 950