Gree GMV MTAC VRF Series, Service Manual

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Gree GMV MTAC VRF for North America
90
(3) Low-pressure protection.
Low pressure
protection
Measure whether the low pressure
is too low 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
Eliminate 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
Check whether the refrigerant-
charging volume is insufficient
Charge refrigerant according to the volume
on nameplate; check whether there is
leakage for the system
YES
NO
NO