Gree CN851W1000, Service Manual

Page: 163 / 233

158
DC Inverter Multi
VRF Service Manual
5
�2 System
5.2.1 Dischar
ge temp of system is abnormal.
Note: the dischar
ge temp mentioned above means the temp of dischar
ge pipe of compressor or the temp of the top of compressor
.
S/N
Class
T
rouble
Possible Cause
T
roubleshooting
First-level reason
Second-level reason
Third-level reason
Description of Cause
Method of
Confirmation
Description of Cause
Method of
Confirmation
Description of Cause
Method of
Confirmation
1
Dischar
ge
temp is
abnormal
Dischar
ge
temp is
superhigh
Not totally opene
d
1.Cut-of
f valve of
outdoor unit is not
opened to the position,
which can allow
maximum flow
.
——
——
——
——
Manually check
Reopen the cut-
of
f valve to the
place where
allows the
maximal flow
.
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 of
f
Coil
V
alv
e
De-ener
gize and then
ener
gize 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
fix the coil
of electric expansion
valve again.