Haier AS25THMHRA-C, Service Manual

Page: 294 / 537

Functions and control
15 Domestic air conditioner
7.1.3 Dehumidifying mode.
* temperature control range: 16---30
ć
* temperature difference:
r
1
ć
Control feature: send the dehumidifying signal to the outdoor system.
When Tr>Ts+2
ć
, the compressor will be turned on, the indoor fan will operate at the set speed.
When Tr is between the Ts and Ts+2
ć
, the outdoor system will operate at the high dehumidifying
frequency for 10 minutes and then at the low dehumidifying mode for six minutes. The indoor fan will
operate at low speed.
When Tr< Ts-1.5
ć
, the outsystem will be stopped, the indoor fan will be stopped for 3 minutes and
then turned to the low speed option.
All the frequency converses have a
f
1
ć
difference.
* Wind speed control: Automatic:
When Tr
•
Ts+ 5
ć
, high speed.
When Ts+3 ć d Tr< Ts+5 ć , medium speed.
When Ts+2
ć d
Tr< Ts+3
ć
, low speed.
When Tr<Ts+2
ć
, light speed.
If the outdoor fan stopped, the indoor fan will be paused for 3 minutes.
If the outdoor fan stopped for more than 3 minutes and the outdoor system still operates, the system
will be changed into light speed mode.
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.
Manual: When the sensor is off or Tr< Ts+3
ć
, the manual operation can not be made. (obligatory
automatic operation.)
*Airgate location control: the location for the airgate can be set according to your needs.
*Defrosting function: preventing the frosting on the indoor heat exchanger (when cooling or
dehumidifying). When the compressor works continuously for 6 minutes and the temperature of the
indoor coils has been below 1 ć for 10 seconds, the compressor will be stopped and the malfunction
will be recorded in the malfunction list. The indoor system will continue to run. When the temperature
of the indoor coil is raised to 9
ć
, the compressor will be restarted again (the requirement of 3 minutes’
delay should be satisfied.)
* Coil protection (synchronic overheating protection) are installed for the four directions latch
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