GREE ELECTRIC GMV(L)-Pd100W/NaB-K, Service Manual

Page: 165 / 242

DC INVERTER MULTI VRF MAINTENANCE
2.2 L
ow-pressure protection
Low-pressure protection
Refer to low pressure sensor error
Refer to the Instruction Manual for Indoor Unit
Fully open the valve
Cover up the front panel properly
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 outdoor
unit. Replace the electronic expansion valve, drying filter and other parts
Add refrigerant according to the nominal refrigerant volume
on nameplate and the calculated charge volume
Use pressure gauge to
measure if the pressure
is really low?
Check if the refrigerant in
the system is too low?
Check if the operation
mode of indoor unit is set
properly?
Check if the gas valve and
liquid valve of outdoor unit
are fully open?
Check if the front panel of
outdoor unit is covered
tightly?
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?
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
No
No