Haier AS25THMHRA-C, Service Manual

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Functions and control
16 Domestic air conditioner
malfunctions when dehumidifying.
* Timing system on/off function.
* Dormant control functio
n.
7.1.4 Heating operation mode.
*
temperature control range: 16---30
ć
* temperature difference: r 1 ć
* control feature: the temperature compensation is automatically added and the system will send the
heating signals to the outdoor system.
If Tr+0.5 ć d Ts, the outdoor compressor is turned on, the indoor fan will be at the cold air proof mode.
If Tr>Ts+1.5
ć
, the outdoor system is turned off, the indoor fan will be at the heat residue sending
mode.
*Indoor fan control
manual control: You can choose high, medium, low and automatic speed control.
Automatic: When Tr<Ts, high speed.
When Ts ” Tr ” Ts+2 ć , medium speed.
When Tr> Ts+2 ć , low speed.
When the airflow speed has no delay from the high to low switching, the speed should be delayed for
3 minutes (remain at high speed for 3 minutes.) before the next switch.
*Airgate location control: the location for the airgate can be set according to your needs.
Coldair proof operation
1. The fan control functions as below:
* Residue heat sending. The indoor fan will send the residue heat at a low speed for 20 seconds.
If other conditions are satisfied, when the compressor stops, the indoor system will operate at a light
speed. The indoor fan will stop when the coil temperature is below the THHOT0.
* Defrosting. When the system receives the defrosting signal from outdoors, the indoor fan will stop
and the indoor temperature display won’t change. At the time, any indoor coil malfunctions will be
neglected. When the outdoor defrosting finishes, the coil malfunction will still be neglected until the
compressor has been started up for 30 seconds. The indoor temperature display will not change and
the system operates at the cold air proof mode.
* Automatic heating temperature compensation: when the system enters the heating mode, the
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