Haier HSU18VH7-W Service Manual - Page 8

The accumulated running time of the compressor exceeds 3 hours,

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Air conditioner Edition: 10070808 State1 State3 State2 Ts-1 Ts Ts+2 Ts+3 3.2.4 Warm start (preventing cold wind when heating running begins, applicable to fan-coil model)) When heating running begins, indoor fan will conduct the following fan control: If the temperature of indoor coil pipe is ≥ 23℃, start lower wind speed; If the temperature of indoor coil pipe is ≥ 38℃ or the running time of compressor≥ 4 minutes, turn to setting wind speed. 3.2.5 Control of indoor fan under heating OFF state (applicable to fan-coil model) Under heating state, the compressor will cease; if the indoor coil pipe's temperature Tp≥23℃, indoor fan will run in lower wind speed. 3.2.6 Defrosting control (applicable to fan-coil model) Defrosting beginning condition: a. After the state of Tp-Tr

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Air conditioner
Edition: 10070808
State1
State2
State3
Ts-1 Ts Ts+2 Ts+3
Warm start (preventing cold wind when heating running begins, applicable to
fan-coil model))
When heating running begins, indoor fan will conduct the following fan control:
If the temperature of indoor coil pipe is
≥
23
℃
, start lower wind speed;
If the temperature of indoor coil pipe is
≥
38
℃
or the running time of
compressor
≥
4 minutes, turn to setting wind speed.
Control of indoor fan under heating OFF state (applicable to fan-coil model)
Under heating state, the compressor will cease; if the indoor coil pipe’s
temperature Tp
≥
23
℃
, indoor fan will run in lower wind speed.
Defrosting control (applicable to fan-coil model)
Defrosting beginning condition:
a.
After the state of Tp-Tr<16
℃
is continued for 5 minutes, the accumulated
running time of the compressor exceeds 45 minutes, the continuous running
time of the compressor exceeds 20 minutes;
b.
The accumulated running time of the compressor exceeds 3 hours, the
continuous running time of the compressor exceeds 20 minutes, indoor
unit’s Tp <38
℃
;
c.
The continuous running time of the compressor exceeds 20 minutes, the
temperature of indoor coil pipe decreases 1
℃
every 6 minutes, which lasts
for more than 3 times, indoor unit’s Tp <38
℃
;
d.
When the indoor unit is in the state of overload protection and the outdoor
unit ceases, when the rerunning time of outdoor unit exceeds10 minutes, the
accumulated running time of the compressor exceeds 45 minutes, the
continuous running time of the compressor is over 20 minutes, and Tp <38
℃
.
Defrosting will begin if one of the above conditions is met.
Defrosting finishing condition:
If the defrosting time exceeds 9 (for 12 models)or 7 (for 07,09 models)
minutes,the original heating state will be resumed;
3.2.4
3.2.5
3.2.6