Electric Control Functions - Haier AP48KN1EAA Service Manual

Single Split

9. Electric control functions

9.1 For indoor unit
1. Communication control
1.1 Remote receive function, with remote controller YR-H005.
1.2 Long-distance communication, the long-distance control function is pre-set
1.3 Wired controller communication, the wired controller can be used for communication by dip-switch
selection. The display board is not available when use wired controller.
Select one control type between wired and remote control, long-distance control can be used with
wire/remote control.
2. Function description
2.1 The running mode includes AUTO, COOL, DRY, FAN and HEAT; can set the compulsory cooling
function; AUTO/HIGH/MID/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; 4-minute protection for compressor; anti-
overload protection, anti-freeze protection, temperature cutoff protection and bad-sensor protection;
communication failure detect function; check indoor ambient temperature and indoor coil temperature;
can be controlled by central controller( It is reserved)
2.2 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. When the compressor is running, the compressor
LED will be on; when it stops, this 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.
2.3 Temperature compensation 4℃ control: Select by the dip switch on indoor PCB.
2.4 There is set temperature in AUTO mode as default.
2.5 Tr stands for room temperature; Ts stands for set temperature; Tg stands for indoor coil
temperature; Tc stands for defrosting temperature; t stands for compensation temperature; Δ T stands
for temperature difference.
2.6 ΔT=Tr-Ts+t (t=0 in cooling mode).
2.7 ΔT=Ts-Tr+t (t=compensation value, with compensation in heating mode; t=0, without
compensation in heating mode).
3. Mode control
3.1 Indoor AUTO FAN control
(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. (The conversion temperature difference is 1 degree).
(2) If the present fan speed is AUTO HIGH, whenΔT ＜ 2, fan speed will change to AUTO MED.
(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.
(4) If the present fan speed is AUTO LOW, whenΔT ＞ 1, fan speed will change to AUTO MED.
(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.
(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.
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