Gree U-MATCH GFH09K3CI, Service Manual

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A/A DC INVERTER U-MATCH AIR CONDITIONERS CONTROL
25
2 MAIN LOGIC
2.1 Cooling
Acc.to control
logic
Cooling mode
3min
Firstly switch off to step 0 and
then switch off step 60
150s atfer the compressor is stoped
180steps
Send out switch-off command
Acc.to control
logic
capacity demand ＞0
send out cooling
command
Indoor fan
(cooling)
4-way valve
3s
Xsteps
30s
ON
ON
ON
OFF
OFF
OFF
Outdoor fan
EXV
compressor
OFF
60s
60s
After the cooling command is sent out, the indoor fan will run at high speed for 5 seconds before it is put into
operation according to the setting. Then, it is started to calculate the system load demand value. If the load is 0, the
other loads except the indoor fan will not be put into operation (The water pump will run according to the pump
control logic behind). If the load is >0, the EXV will be firstly opened to step X; then the indoor fan is started. After 30
seconds, the compressor is started at initial frequency 40Hz and will be maintained for 3 minutes. After that, the
compressor, EXV and outdoor fan will adjust according to logic.