Electrical Control Functions - Haier AB182ACERA Service Manual

9. Electrical Control Functions

AB182ACERA electric control function:
1.General features
1.1 The running mode includes AUTO, COOL, DRY, FAN and HEAT; can set the compulsory
cooling function; AUTO/HIGH/LOW 3-speed for indoor motor; can set the TIMER ON,TIMER OFF,
TIMER ON/OFF and SLEEP function; auto-check water level and control the water drainage of
water pump; the swing is controlled by stepping motor; 3-minute protection for compressor;
anti-overload protection, anti-freezed protection and bad-sendor protection; check indoor ambient
temperature, indoor coil temperature and outdoor coil temperature; can be controlled by central
controller.
1.2 LED indication: 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.
1.3 Temperature compensation control: select the 4 degree compensation or no compensation by
the dip switch on indoor PCB.
1.4 There is set temperature in AUTO mode as default.
1.5 Tr stands for room temperature; Ts stands for set temperature; Tc stands for defrosting
temperature; t stands for compensation temperature; ΔT stands for temperature difference.
1.6 ΔT=Tr-Ts+t (t=0 in cooling mode)
1.7 Δ T=Ts-Tr+t (t=compensation value, with compensation in heating mode; t=0, without
compensation in heating mode)
2. Indoor AUTO FAN control
2.1 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 med speed; when thermostat is OFF, fan will be low speed. (the
conversion temperature difference is 1 degree).
2.2 If the present fan speed is AUTO HIGH, whenΔT＜2, fan speed will change to AUTO MED.
2.3 If the present fan speed is AUTO MED, whenΔT＜0, fan speed will change to AUTO LOW;
whenΔT＞3, fan speed will change to AUTO HIGH.
2.4 If the present fan speed is AUTO LOW, whenΔT＞1, fan speed will chenge to AUTO MED.
2.5 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.
2.6 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.
3. AUTO mode control
3.1 When entering AUTO for the first time, the unit will select the running mode due to the below
conditions, then perform the selected mode.
Tr≥Ts-3℃ select COOL mode (includes FAN mode)
Tr＜Ts-3℃ select HEAT or FAN mode
3.2 After entering the AUTO mode, the mode can change over among COOL, HEAT or FAN modes
according to the indoor ambient temperature (conversion temperature difference is ±3℃).
3.3 If the unit is in COOL mode, when it arrives compressor-stop temperature, the compressor will
stop; after compressor stops for 15 minutes, the unit will check the room temperature, if Tr＜Ts-3℃,
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Commercial Air Conditioner
Model: AB182ACERA
AC182ACERA