Service manual


GB
Operation in Dehumidify Mode
Dehumidify mode is same as cooling mode.
Operation in heating Mode
Adjustment of Expansion Valve:
1. Reset of Expansion Valve
In the first time, the expansion valves in t�o channels shall be shut do�n 600 steps, then
the expansion valve corresponding to the indoor unit in normal communications �ith the
outdoor unit shall be opened to standby mode steps. If accomplished, the outdoor unit
shall be on standby mode, until the turn-on the indoor unit.
2. Adjustment of Expansion Valve
1) Setting of Basic Step
After the confirmation of the turn-on order in heating mode, the expansion valve of the
relevant indoor unit shall be set to the basic step.
2) Adjustment of Expansion Valve according to the difference in temperature bet�een the
inlet and outlet of evaporator
During the first ten minutes of heating mode, the expansion valve of the indoor unit shall
be set to the basic step and can’t adjust. Ten minutes later, the expansion valve step and
its adjust cycle shall be adjusted according to the difference in temperature bet�een the
inlet and outlet of evaporator.
Control of compressor’s frequency
Range of compressor’s frequency: Fmin-Fmax (Fmin: the lo�est frequency, Fmax: the highest
frequency)
Control of fan motor in heating model (figure 5 )
1. The fan motor of outdoor unit is ahead run 20 seconds before compressor turn on.
2. After compressor turn off, the fan motor of outdoor unit delay 30 seconds.
3. The fan motor speed of outdoor unit as belo� table in normal running, it has 20 seconds
compressor
outdoor FM
20s 30s 30s
figure 3