Haier H-MRV AF092FCBHA, Service Manual

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Closing the cycle can avoid indoor freezing.
When the temperature measured by the indoor coil temperature coil is too low, the unit will enter
anti-freezed operation and be set under the below conditions.
Anti-freezed operation start condition:
If accumulative operation time is over 10 minutes at one temperature, the system will make the
thermostat OFF compulsorily until the anti-freezed function can reach stop condition.
Anti-freezed operation stop condition:
The time is over 10 minutes when the temperature rises upto one certain temperature.
2. Dry operation mode
2.1
Temeprature control range: 16~30
℃
, and control precision:
±
1
℃
2.2 Characteristic of electronic expansion valve (EEV): as the same as that of cooling mode.
2.3 Fan speed control
Auto: Tr>Ts+1 high speed
Ts+1>Tr
≥
Ts low speed
Ts>Tr stop fan motor in 3 minutes, 3 minutes later, low speed
When fan speed changes from low to high,there is no delay, and when changing from high to low there is
30-second delay.
Thermostat OFF: fan motor stops in 3 minutes, meanwhile the valve goes back to standby angle, and 3
minutes later, it is low speed.
Fan speed adjustment by hand: when unit is running, you can set High/Med/Low/Auto speed due to
request.
2.4 No temperature compensation in Dry mode
2.5 Anti-freezed protection:
as the same as that of cooling mode.
3. Heating mode
3.1
Temeprature control range: 16~30
℃
, and control precision:
±
1
℃
3.2 Characteristic of electronic expansion valve (EEV): as the same as that of cooling mode, but the
open angle is different.
3.3 Fan speed control
Auto speed:
Heat mode:
TA-TS +1
Super low speed
0
low speed
-1
med speed
-2
high speed
When fan speed changes from low to high,there is no delay, and when changing from high to low there is
30-second delay.
Thermostat OFF: EEV delays to close, after the fan motor enters super low speed, the thermostat will be
OFF.
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