Gree GMV-224WM/B-X, Service Manual

Page: 141 / 375

GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
138
pressure is
too low
(compared
with the
reference
value).
3.2 The
air pipe is
blocked.
temperatur
e
difference.
The
difference
is large or
part of the
pipe is
frosting.
—— ——
Replace
and solder
the pipe.
3.3 The
pipe that
connects
the IDU is
blocked.
Touch the
pipe along
the flowing
direction of
refrigerant
to feel the
temperatur
e
difference.
The
difference
is large or
part
of the pipe
is frosting.
3.3.1 The
block is
caused
by solder.
Cut off the
pipe to see
if it is
blocked.
Replace
and solder
the pipe.
3.3.2 The
pipeline
is
blocked
by
impurities
.
Replace
and solder
the pipe.
4. Lacking
refrigerant
The
system's
exhaust
temperature
rises and
the low
pressure is
too low
(compared
with the
reference
value).
4.1 Not
enough
refrigerant
—— —— ——
Inject
refrigerant
as
required.
4.2
Refrigera
nt pipe
leakage
Use the
refrigerant
leak
detector to
detect the
leak along
the pipe.
—— ——
Stop the
leak. Pump
out air and
inject
refrigerant
again.
5. Wrong
refrigerant
is
injected.
Stop the
whole
system.
Test
the
system's
balance
pressure 20
minutes
later and
convert the
pressure
into the
correspondi
ng
saturation
temperature.
Compare it
with the
outdoor
ambient
temperature
. If the
difference is
—— —— —— ——
Discharge
existing
refrigerant
and inject
the correct
refrigerant
as
required.