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10. CONTROL SYSTEM
10.1 Main Functions
Forced switch
When air conditioner is on, press forced switch, the unit will be turned off; or when air conditioner is off, press the forced switch, unit
will be turned on and enter into auto mode operation. Once receiving signal from remote control or wired control, the unit will run in
setting mode.
Commissioning
Press forced switch for 5 seconds until buzzer sounds twice, then controller gets into commissioning. At the state of
commissioning, press the forced switch, the unit will be turned off. The commissioning time will last for 30 minutes and the mode
is cooling.
a）In the mode of commissioning, inlet air temperature sensor is ineffectual. Compressor runs after 3 min protecting.( 3 min
protecting are not available in the first time power),indoor fan is running in low speed.
b）In the mode of commissioning, no protection is valid except the three phase protection and the 3 min protection for the
compressor.
Auto operation
When remote control select auto mode, the unit will choose cooling, dehumidify or heating according to indoor temperature and
automatically runs at selected mode.
a) When getting into auto mode, the indoor unit runs at low wind for 20 seconds while other equipment not start, after 20 seconds,
indoor fan stops, the units enters into mode judgment.
b) Once the room temperature over 27℃ the units run in cooling mode of setting wind and setting
temperature 24℃.
c) When the room temperature is between 20℃ and 27℃, the units run in dehumidifying mode of setting wind and setting
temperature 24℃
d) When the room temperature is under 20℃, the unit run in heating mode (Cooling-only in ventilation mode) of setting wind and
setting temperature 24℃
e) The system mode do not change according to temperature fluctuation, restarting or mode changing, the controller should select
operation mode.
Cooling operation
Temperature is set by remote controller or wired controller, it can be adjusted from 16℃ - 32℃ by pressing "temperature +",
"temperature -" on the remote controller (or wired controller). Press "fan speed" button to choose fan speed among auto wind, high
speed wind, medium speed wind, low speed wind. Operation state
a) The indoor fan motor always runs at the speed set by remote controller or wired controller.
b) When the indoor temperature TA-setting temperature TS≥1℃, the compressor starts as well as outdoor fan after compressor
meets 3 min protection
c) When TA =TS, The unit operation state keep the same.
d) When indoor unit temperature TA – setting temperature TS ≤ -1, the compressor and outdoor fan stop after compressor meets 3
min protection.
CONTROL SYSTEM
17 | S e r v i c e M a n u a l
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