Poor Cooling/Heating Performance - Gree GMV-S120WL/A-S Service Manual

7.Not
enough
refrigeran
t

4.1.2.3/ Poor cooling/heating performance

Feedback
Exception
from user
A. When
the IDU is
working in
the cooling
mode and
the
electronic
expansion
valve is
opened to
2000PLS,
the
Poor
exhaust
heating/coo
temperatur
ling
e of the
performanc
IDU's coil
e
is more
than 5C
higher
than the
intake
temperatur
e;
B. when
the IDU is
working in
the heating
mode and
GMV5 Home DC Inverter Multi VRF Units
Incorrect
quantity
Other of
reasons refrigeran
t is
injected.
Primary cause
Confirmat
Descripti
ion
on
method
1.The
stop
valve of
the ODU
is not
fully
opened
as
required.
2.The
system
pipeline
is
blocked.
control
board of the
fan's motor
is damaged.
6.2.4The
main board
of the fan's
motor is
damaged.
Possible causes
Secondary cause
Confirmat
Descripti
ion
on
method
Touch the
pipe
along the
flowing
direction
2.1The
of
system
refrigeran
air
t to feel
pipeline
the
is
temperat
blocked.
ure
difference
. The
difference
is large.
2.2The Touch the
fluid pipe pipe
is along the
blocked. flowing
285
Manual
check the control
Other
reasons
low-pressu
re air pipe.
Tertiary cause
Confirmat
Descripti
ion
on
method
Manual
check
2.1.1Th
e block
is
caused
by
solder.
Cut off
the pipe
2.1.2Th
and
e
pipeline check it.
is
blocked
by
impuritie
s.
Replace
board of
the motor.
Replace
the motor.
Check the
necessary
amount of
refrigerant
and inject
refrigerant
slowly via
the stop
valve of
the
Solution
Fully open
the stop
valve.
Replace
and solder
the pipe.
Replace
and solder
the pipe.
Replace
and solder
the pipe.