Gree GMV-400WM/B-X - Page 153

GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
150
Feedback
from user
Exception
Possible reasons
Solution
Primary reason
Secondary reason
Tertiary reason
Descript
ion
Confirm
ation
method
Descripti
on
Confirm
ation
method
Descrip
tion
Confirm
ation
method
Poor
heating/co
oling
performan
ce
A. When
the IDU is
working in
the
cooling
mode and
the
electronic
expansio
n valve is
opened to
2000PLS,
the
exhaust
temperatu
re of the
IDU's coil
is more
than 5°C
higher
than the
intake
temperatu
re; B.
when the
IDU is
working in
the
heating
mode and
the
electronic
expansio
n valve is
opened to
2PLS, the
intake
temperatu
re of the
IDU's coil
is more
than 12°C
lower
than the
saturation
temperatu
re
correspon
ding to
the high
pressure;
1. The
stop
valve of
the
ODU is
not fully
opened
as
required
.
——
——
——
——
Manual
check
Fully
open the
stop
valve.
2. The
system
pipeline
is
blocked.
——
2.1. The
system
air
pipeline
is
blocked.
Touch
the pipe
along
the
flowing
direction
of
refrigera
nt to feel
the
temperat
ure
differenc
e. The
differenc
e is
large.
2.1.1
The
block is
caused
by
solder.
Cut off
the pipe
and
check it.
Replace
and
solder
the pipe.
2.1.2
The
pipeline
is
blocked
by
impuriti
es.
Replace
and
solder
the pipe.
2.2 The
fluid pipe
is
blocked.
Touch
the pipe
along
the
flowing
direction
of
refrigera
nt to feel
the
temperat
ure
differenc
e. The
differenc
e is large
or part of
the pipe
is
frosting.
——
——
Replace
and
solder
the pipe.
2.4 The
pipe that
connects
the IDU
is
blocked.
Touch
the pipe
along
the
flowing
direction
2.4.1
The
block is
caused
by
solder.
Cut off
the pipe
and
check it.
Replace
and
solder
the pipe.