Gree GMV-Pdm450W/NaB-M

160
DC Inverter Multi
VRF Service Manual
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
7
Discharge
temp is
abnormal
Discharge
temp is
superhigh
4.Pipeline of the
system is blocked
Discharge temp of the
system abnormally
increases and the
low pressure is too
low(Judge according
to reference standard).
4.1 Liquid pipe of the
system is blocked.
Along the ow
direction of refrigerants,
the difference of
local temperatures is
great or there is frost
on partial pipe.
—— ——
Replace and weld
pipeline again.
8
4.2 Low pressure gas pipe
of the system is blocked.
—— ——
Replace and weld
pipeline again.
9
4.3 The connecting pipe
of indoor unit is blocked.
Along the ow
direction of refrigerants,
the difference of
local temperatures is
great or there is frost
on partial pipe.
4.4.1 The welding
causes block.
Cut the pipe
to check.
Replace and weld
pipeline again.
10
4.4.2 There are too many
impurities inside the pipeline.
Replace and weld
pipeline again.
11
5. Refrigerants
of the system are
inadequate.
Discharge temp of the
system abnormally
increases and the
low pressure is too
low(Judge according
to reference standard).
5.1 The volume
of refrigerants is
not calculated or
added according to
requirements.
—— —— ——
Add refrigerants
according to
requirements.
12
5.2 Leak of the pipeline
causes the insufciency
of the refrigerants.
Check it with leak
detector of refrigerants.
—— ——
Handle the leak and
vacuumize the pipe
again and charge
the refrigerants.
13
6. The type of
the refrigerants
added is wrong.
Stop the complete
unit and check the
equalizing pressure
of high and low
pressures after 20
min. Then, transfer
the pressure value
to the corresponding
saturation temp and
compare it with outdoor
ambient temp. If the
temp difference is more
than 5
, it is abnormal.
—— —— —— ——
Release the
refrigerants inside
the system and
recharge the correct
refrigerants.
14
7. The inspection
of discharge temp
sensor is wrong.
—— —— ——
Replace temp
sensor or
mainboard.
15
8. Ambient temp
exceeds the range
for safe running.
——
Ambient temp is
more than 48
.
Collect ambient
temp on spot.
—— ——
Normal
phenomenon.