Main Logic; Cooling - Gree U-MATCH GUHD09NK3CO Service Manual

A/A DC INVERTER U-MATCH AIR CONDITIONERS

2 MAIN LOGIC

2.1 Cooling

OFF
compressor
OFF
Outdoor fan
EXV
4-way valve
Indoor fan
OFF
(cooling)
3s
send out cooling
command
capacity demand ＞0
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.
Cooling mode
3min
Acc.to control
ON
logic
Acc.to control
ON
logic
30s
Xsteps
OFF
ON
Send out switch-off command
60s
180steps
150s atfer the compressor is stoped
Firstly switch off to step 0 and
60s
then switch off step 60
CONTROL
25