Gree DC Inverter Multi VRF

DC INVERTER MULTI VRF MAINTENANCE
183
2 Flow chart of troubleshooting
2.1 High-pressure protection
Remove the obstructions
Measure the fan motor and
signal input
Measure the swing motor and
signal input
Refer to the dial-up of indoor and outdoor unit
Engage the valve body with the coil
Refer to the Repair and Maintenance
The system pipe is blocked
Focus on checking the inlet and outlet of the connection between indoor units and main
pipe. Also focus on checking the electronic expansion valve of indoor unit and outdoo
r
unit. Replace the electronic expansion valve, drying filter and other parts
Check if the air inlet and outlet
of the indoor and outdoor
exchanger is smooth?
Check if the indoor
and outdoor fans run
normally?
Check if the indoor
swing louver is fully
open?
Check if the capacity output of
outdoor unit is equal to the
capacity demand of indoor
units?
Check if the indoor
electronic expansion valve
can work normally
Check if the indoor /
outdoor filters or radiating
fins are dirty or blocked?
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
Cover up the front panel properly
Check if the front panel of
outdoor unit is covered
tightly?
No
Yes
Fully open the valve
Replace the pressure switch
Refer to the Instruction Manual for
Indoor Unit
Replace the mainboard of outdoor unit
High-pressure protection
Use pressure gauge to
measure if the pressure is
really high?
Measure if the
pressure switch is
normal？
Check if the operation
mode of indoor unit is
set properly?
Check if the gas valve
and liquid valve are
fully open?
No
No
No
No
Yes
Yes
Yes
Yes