Haier AB122ACERA Service Manual - Page 42

Commercial Air Conditioner Model: AU122AEERA AB122ACERA AC122ACERA AD122ALERA AB122ACERA AC122ACERA AD122ALERA electric control function: 1.General features 1.1 Control mode: remotr or wired control + connecting port of long-distance control + passive port switch control. 1.2 Temperature control: 16-30℃; 1.3 Precise of temperature control: ±1℃; 1.4 Indoor fan speed: AUTO, HIGH, MIDDLE, LOW (no AUTO when in FAN mode); 1.5 Swing control: the swing are controlled by the synchronous motor, main control board receive usable signal and set in swing mode or remain in other mode; 1.6 running mode: AUTO , COOL, DRY, FAN and HEAT; 1.7 Healthy function: 5VDC UV generator, 12VDC negrative ion generator - high voltage collecting-dirt, 220VAC negrative ion generator - oxygen pump; 1.8 Filter up-down control: adopt double-direction synchronous motor; 1.9 Auxiliary electric heating function: 12VDC control signal, 220VAC control signal or control switch; 1.10 Fresh air control: 12VDC DC motor,220VAC AC control port output; 1.11 CLOCK setting, TIMER ON, OFF, ON/OFF and SLEEP fuction (only TIMER function is viable and temperature variety is unviable when running the SLEEP function in FAN mode); 1.12 Drain system function: Water level inspection and water pump control 1.13 Compulsory cooling operation; 1.14 Safety and protection devices: 3-minute protection for compressor startup, freeze protection device, overheat protection device, temperature cutoff protection, sensor failure, drainage, pressure, communication etc. protection. 1.15 Indoor ambient temperature, indoor and outdoor coil temperature inspection. 1.16 start current control: the outdoor fan start after compressor running 2s in normal situation. 2. LED function: The LED for remote control type includes POWER, TIMER, COMPRESSOR, WATER PUMP; the POWER LED also indicate failure; when the unit is switched on by the controller, the POWER LED will be ON, when being switched off, the POWER LED will be OFF.; If the controller is in TIMER and SLEEP mode, the TIMER LED will be on; if it is not in TIMER and SLEEP mode, the TIMER LED will be off. When the compressor is running, the compressor LED will be on; when it stops, this LED will be off. POWER LED flashes when there are system failure, the flash times ti indicate the failure code. 3. Indoor AUTO FAN control a) If the unit enters AUTO FAN for the first time, when ΔT＞2, select high speed; whenΔT≤ 0, select low speed; or it will select ΔT 2 0 High Mid High 3 Mid 1 Low ΔT med speed; when thermostat is OFF, fan will be low speed. (the conversion temperature difference is 1 degree). b) If the present fan speed is AUTO HIGH, whenΔT＜2, fan speed will change to AUTO MED. c) If the present fan speed is AUTO MED, whenΔT＜0, fan speed will Low change to AUTO LOW; whenΔT ＞ 3, fan speed will change to AUTO HIGH. d) If the present fan speed is AUTO LOW, whenΔT＞1, fan speed will chenge to AUTO MED. e) Fan speed conversion in AUTO FAN mode: the conversion will delay for 3 minutes from HIGH to LOW, and no delay from LOW to HIGH. f) When the fan speed is HIGH/LOW/MED, on the condition that the protection does not act, the unit will run at the set fan speed; when the protection acts, for the sake of the normal operation, the fan speed will be forced to conversion; in Dry mode, fan motor will be changed as request. 4. AUTO mode control 4.1 When entering AUTO for the first time, the unit will select the running mode due to the below 42