Gree GC201808-III, Service Manual

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GREE GMV5 HR HEAT RECOVERY UNITS
177
(3) Poor cooling/heating performance
Feedback
from user
Exception
Possible reasons
Solution
Primary reason Secondary reason Tertiary reason
Description
Confirmation
method
Description
Confirmation
method
Description
Confirmation
method
Poor heating
/cooling
performance
A. When the
IDU is working
in the cooling
mode and the
electronic
expansion
valve is opened
to 2000PLS,
the exhaust
temperature of
the IDU's coil is
more than 5°C
higher than the
intake
temperature; B.
when the IDU is
working in the
heating mode
and the
electronic
expansion
valve is opened
to 2PLS, the
intake
temperature of
the IDU's coil is
more than 12°C
lower than the
saturation
temperature
corresponding
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 gas
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
connects
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
temperature
exceeds the
required
range.
——
3.1 The
ambient
temperatur
e of the
IDU that
works in
the cooling
mode is
higher than
32°C
(
90
° F)
.
Measure the
outdoor
ambient
temperature.
3.1.1 The
system has
worked for
less than 1
hour.
——
It is a normal
phenomenon
.
3.1.2 An
improper
system is
selected.
——
Choose
another
system with
larger power.