Gree GMV-400WM/B-X - Page 150

GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
147
opened
as
required.
2. The
system
pipeline
is
blocked.
The
system's
exhaust
pressure
rises and
the low
pressure
is too low
(compar
ed with
the
referenc
e value).
2.1. The
system
air
pipeline
is
blocked.
Touch the
pipe along
the flowing
direction of
refrigerant to
feel the
temperature
difference.
The
difference 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
impurities.
Replace
and
solder
the pipe.
2.2 The
fluid
pipe is
blocked.
Touch the
pipe along
the flowing
direction of
refrigerant to
feel the
temperature
difference.
The
difference is
large or part
of the pipe is
frosting.
——
——
Replace
and
solder
the pipe.
2.4 The
pipe that
connect
s the
IDU is
blocked.
Touch the
pipe along
the flowing
direction of
refrigerant to
feel the
temperature
difference.
The
difference is
large or part
of the pipe is
frosting.
2.4.1 The
block is
caused by
solder.
Cut off
the pipe
and
check it.
Replace
and
solder
the pipe.
2.4.2 The
pipeline is
blocked by
impurities.
Replace
and
solder
the pipe.
3. The
ambient
temperat
ure is
too low.
——
3.1 The
outdoor
ambient
temperat
ure is
lower
than
-25°C in
the
heating
mode.
Measure the
outdoor
ambient
temperature.
——
——
It is a
normal
phenome
non
caused
by the
protectio
n
function.
4. The
pressure
sensor
is faulty.
——
4.1 The
low
pressure
sensor
is faulty.
Stop the
whole
system. Test
the system's
balance
pressure 20
minutes
——
——
Replace
the high
pressure
sensor.