Electrical Control Functions - Haier HPU-42CV03 Service Manual

9. Electrical Control Functions

For indoor unit
1.Indoor AUTO FAN control
A. During cooling program.
If the unit enters AUTO FAN for the first time, when Tr＞Ts+2, select high speed;
when Tr≤Ts, select low speed; or it will select med speed; If the present fan speed is
AUTO HIGH, when Tr＜Ts+2, fan speed will change to AUTO MED. If the present fan
speed is AUTO MED, when Tr＜Ts, fan speed will change to AUTO LOW; when Tr＞Ts+3,
fan speed will change to AUTO HIGH. If the present fan speed is AUTO LOW, when Tr＞
Ts+1, fan speed will chenge to AUTO MED. 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.
The sketch map is as follow:
Set temp.＋2℃
Set temp.
B. During heating program
If the unit enters AUTO FAN for the first time, when Tr＞Ts-1, select low speed; when
Tr≤Ts-3, select high speed; or it will select med speed; If the present fan speed is AUTO
LOW, when Tr＜Ts-1, fan speed will change to AUTO MED. If the present fan speed is
AUTO MED, when Tr＞Ts, fan speed will change to AUTO LOW; when Tr＜Ts-3, fan
speed will change to AUTO HIGH. If the present fan speed is AUTO HIGH, when Tr>Ts-2,
fan speed will chenge to AUTO MED (Ts means setting temperature on the wired
controller). 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.
The sketch map is as follow:
Ts－1℃
Ts－3℃
Commercial Air Conditioner
high
med
low
.
low
med
high
41
high
Set temp.＋3℃
med
Set temp.＋1℃
low
low
Ts
med
Ts－2℃
high
Model: HPU-42CV03
HPU-42HV03