Gree GMV MTAC VRF Series, Service Manual

Page: 93 / 117

Gree GMV MTAC VRF for North America
89
(2) High pressure protection.
High pressure
protection
Measure whether the high pressure
is too high with manometer
Measure whether
the pressure
switch is normal
Replace main
board of outdoor
unit
Replace
pressure switch
Check whether gas valve and liquid
valve are open completely
Open the valve
completely
Check whether the panel of
outdoor unit is covered and sealed
well
Check whether the air can blow
smoothly at the heat exchanger of
indoor unit and outdoor unit
Check whether the indoor fan and
outdoor fan can operate
Cover the panel of
outdoor unit well
E liminate obstacles
and sundries
Measure the
circumstances of fan
motor and signal input
Check whether the indoor swing
blade is open completely
Measure the
circumstances of swing
motor and signal input
Check whether the electronic expansive value for
indoor unit and outdoor unit can operate normally
Engage valve and
coil
Blockage for
system pipeline
Mainly check the air inlet and air outlet connecting
indoor unit and main pipe, and the expansive valve
for indoor unit and outdoor unit. Replace electronic
expansion valve, dry strainer,ect.
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
Check whether the refrigerant-
charging volume is superfluous
Charge refrigerant according to the volume on
nameplate; check whether there is leakage for the
system
YES
YES