Haier AB122ACERA Service Manual - Page 45

Commercial Air Conditioner Model: AU122AEERA AB122ACERA AC122ACERA AD122ALERA alarm. 7.6 Anti-cold air function in heating mode After entering heating mode, or last defrosting is over, the compressor will start up, if Tg＜28℃, indoor motor will stop; if 38℃>Tg≥28℃, indoor motor will run at low speed; if Tg≥38℃ or the compressor has run for over 4 minutes, indoor motor will run at the set speed; once the motor has started up, it will not stop because of Tg reduction. 7.7 Blowing remaining heat function In heating mode, the thermostat is OFF, the compressor stops, indoor motor will run at low speed until Tg＜28℃ and has run for 50 seconds at least. Note: in heating mode, "the compressor stops----indoor motor delays to stop" adjust if the pipe blows remaining heat; "the compressor startup----indoor motor delays to start up" adjust if the pipe is anti-cold air; in other conditions, the compressor and the indoor motor are allowable not to be in company. In cooling mode, the motor will run according to the control, not together with the compressor. 7.8 Defrosting function in heating mode In defrosting and when the compressor resumes to run for 3 minutes after defrosting is over, the unit will not adjust the sensor failure. 7.8.1 Manual defrost: In heating mode, the set temperature 30℃ and in high speed, in 5 seconds, press SLEEP button 6 times continuously, then the buzzer will sound 3 times, you can enter the manual defrosting. At this moment, the unit will not adjust the enter condition of defrost and begin to defrost function directly, whose procedure is as the same as the auto defrost; the quit condition is that the defrosting time is up to 5 minutes. 7.8.2 Auto defrost enter condition: a) the compressor has run for 45 minutes continuously or for 75 minutes in all and has run for over 10 minutes continuously. b) the compressor and outdoor fan running normally. c) the temp. of indoor coil sensor lower than 45℃, d) the defrosting temp. lower than -8 ℃ (use the defrosting start signal from outdoor in the condition of with outdoor communication ). 7.8.3 Auto defrost quit condition: The defrosting temp. over 14℃ or the defrosting time is over 12 minutes (use the defrosting end signal from outdoor in the condition of with outdoor communication ) 7.8.4 Defrost process : a) enter defrosting mode, the compressor, outdoor and indoor fan motor stops; b) 55 seconds later, 4-way valve will be reverse, after more 5 sensonds, compressor begins to run; c) defrosting is over, compressor stops, outdoor fan running at high speed; d) 55 seconds later, 4-way valve runs and compressor starts up. The indoor fan motor will run at anti-cold air condition. 7.8.5 For the unit with auxiliary electric heating function: a. If the auxiliary electric heating function is working when the defrosting condition is met, please stop electric heater firstly, 20 seconds later, defrosting can begin; b. After defrosting, the unit will adjust the working state of electric heater according to the setting before defrosting. 7.9 Auxiliary electric heating function (valid in heating mode or heating state in AUTO mode) Enter condition: 1) ΔT>1; 2) Thermostat ON and running for 1 minute; 3) Tr52℃ If one of the above conditions can be met, the electric heater will stop. 8. FAN mode control The compressor and the outdoor motor will stop running, indoor motor can be set at high/med/low speed, the fan blade can swing or stay at one position. In this mode, you can set the TIMER and SLEEP function. 9. CLOCK setting and TIMER function The unit can set 24-hour TIMER ON/OFF, and the min. unit is 1 minute, after being set, the timer lamp of indoor will be on, and after the timer is over, the timer lamp will be off. TIMER ON: RUN LED is off, compressor LED is off, and TIMER LED is on, the unit is in stop state. 45