Haier AB122ACERA Service Manual - Page 34

Commercial Air Conditioner Model: AU122AEERA AB122ACERA AC122ACERA AD122ALERA 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. ~15 15~38 38~ Max. running frequency Hz(E) 60 100 80 Compressor min. running frequency in cooling mode: outdoor ambient temp. ~38 38~ Min. running frequency Hz(E) 16 16 Compressor max. running frequency in heating mode: outdoor ambient temp. ~0 0~15 15~ Max. running frequency Hz(E) 120 100 80 Compressor min. running frequency in heating mode: outdoor ambient temp. ~10 10~ Min. running frequency Hz(E) 30 30 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 Class-2 Class-3 Class-4 Class-5 Class-6 Class-7 Stop 250 400 550 650 850 900 950 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