Main Logic; Cooling; Dry Mode - GREE ELECTRIC GUHD09NK3CO Service Manual

U-Match Series DC
Inverter Service Manual

2 MAIN LOGIC

2.1 Cooling

compressor
Outdoor fan
EXV
4-way valve
Indoor fan
(cooling)
send out cooling
command
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
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.

2.2 Dry Mode

The dry mode is basically same as cooling mode. The difference is that:
a.
b. Max. capacity output: A×90%
39
Cooling mode
OFF
ON
OFF
30s
ON
OFF
3s
capacity demand
Send out switch-off command
3min
Acc.to control
ON
logic
Acc.to control
logic
60s
180steps
Xsteps
60s
OFF
150s atfer the compressor is stoped
Firstly switch off to step 0 and
then switch off step 60