Air Conditioner Service Manual
5
Electronic controller
NOTES:
RT-------Room Temperature.
IPT------Indoor Pipe Temperature.
ST------indoor Setting Temperature.
OPT---Outdoor Pipe Temperature.
CRT---Compensated Room Temperature
1. Automatic mode
1) The initial RT determines A/C working mode and the setting temperature (ST), the mode is
determined effective only once unless A/C shut-down and then re-started. If from other mode
switches to automatic mode (including mode conversion after shutdown), it should be that the
compress stop more than 3 min then temperature judgment and automatic mode are conducted (it
can conduct immediately from fan mode switched to automatic, the indoor fan stops, three minutes
later the response is made and start up). Within 3 min, the output as: Showing the room
temperature, indoor fans starts (or anti-cold airflow), the outdoor fan stops;
With auto re-start controller, once being turned off or in case of an accidently power cut, the
A/C is able to retain and restore the original mode when being turned on or the power supply
is resumed, if the autorestart function activated. power-off after power-on; while if the auto
restart function isn’t activated, the A/C enters standby state.
Heat pump
Mode Initial RT Initial ST
Cooling RT≥26°C 23°C
Dry 26°C＞RT≥20°C 7°C
Heating RT＜20°C 23°C
Cooling-only
Mode Initial RT Initial ST
Cooling RT≥26°C 23°C
Dry 26°C＞RT≥20°C 7°C
Ventilating RT＜20°C －
Under automatic mode (including from automatic converted into Dry mode), when A/C received the
temperature UP or DOWN signals from the remote controller, the setting temperature (ST)
adjusts
correspondingly to the current room temperature plus or minus 1°C, the automatic regulating
temperature range is ± 2°C.
2. Cooling mode
1) The control of the compressor
a.
When RT－ST≥1°C，the compressor is running.
b.
When RT－ST＜－1°C，the compressor stops.
c.
When－1°C≤RT－ST＜1°C, the compressor keeps its original state.
2) Outdoor fan motor and the compressor run simultaneously (except for defrosting).
3) The control of indoor fan motor:
a.
Indoor fan motor can operate by automatic, low, middle, or high airflow speed circularly.
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