Gree GMV-400WM/B-X - Page 143

GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
140
re
temperature
is smaller
than 10°C .
1.3.2 The
body of
the valve
is faulty.
——
Replace
the body of
the
electronic
expansion
valve.
2. The
IDU's
electronic
expansion
valve is
not
working
properly
When the
system is
working
in the
cooling
mode and
the ODU's
electronic
expansion
valve is
opened
to 200PLS,
the exhaust
temperature
of the IDU's
coil is more
than 1°C
lower than
the intake
pipe's
temperature
and the
difference
between
the
compressor'
s exhaust
temperature
or cover
temperature
and the
high-pressu
re
temperature
is smaller
than 10°C .
2.1 The
controlling
of
electronic
expansion
valve by
main
board of
indoor unit
is
abnormal.
Reset the
IDU.
Listen to
the sound
and touch
the tube to
see if the
electronic
expansion
valve is
reset.
If it is set,
it is
normal.
Otherwise,
it is faulty.
2.1.1 The
control
wire of
the
electronic
expansio
n valve is
not
connecte
d to the
main
board.
Manual
check
Connect
the
electronic
expansion
valve's
control
wire to the
main
board.
2.1.2 The
control
wire that
connectin
g
the
electronic
expansio
n valve to
the main
board is
broken.
Manual
check
Repair or
replace the
control
wire of the
electronic
expansion
valve.
2.2 The
body of
the
electronic
expansion
valve is
not
working
properly.
Other
reasons
2.2.1
Affected
by
impurities
in the
system
——
Clean the
system
and clear
the
impurities.
Replace
the body of
the
electronic
expansion
valve.
2.2.2 The
valve
body is
faulty.
——
Replace
the body of
the
electronic
expansion
valve.
3.
Exhaust
temperatu
re sensor
failure
——
——
——
——
——
Replace
the
temperatur
e sensor or
main
board.