Gree GMV-Pdm450W/NaB-M

158
DC Inverter Multi
VRF Service Manual
5�2 System 5.2.1 Discharge temp of system is abnormal.
Note: the discharge temp mentioned above means the temp of discharge pipe of compressor or the temp of the top of compressor.
S/N Class Trouble
Possible Cause
Troubleshooting
First-level reason Second-level reason Third-level reason
Description of Cause
Method of
Conrmation
Description of Cause
Method of
Conrmation
Description of Cause
Method of
Conrmation
1
Discharge
temp is
abnormal
Discharge
temp is
superhigh
Not totally opened

1.Cut-off valve of
outdoor unit is not
opened to the position,
which can allow
maximum ow.
—— —— —— —— Manually check
Reopen the cut-
off valve to the
place where
allows the
maximal ow.
2
2.Electric expansion
valve does not
correctly operate
In cooling mode,
when electric
expansion valve is
opened to 480PLS,
outlet temp
of coil pipe
of indoor unit is
greater than inlet
temp for over 15
.
In heating mode,
when electric
expansion valve is
opened to 480PLS,
inlet temp
of coil pipe
of indoor unit is
lower than ambient
temp for over 10 .
2.1 Coil of electric
expansion valve is
loose or drops off
Coil
Valve
De-energize and then
energize the indoor
unit, check if the
electric expansion
valve is reset by
touching pipeline and
hearing the voice. If it
is reset, it is normal.
—— Manually check
Install and
x the coil
of electric
expansion
valve again.