Gree GC201808-III, Service Manual

Page: 182 / 362

GREE GMV5 HR HEAT RECOVERY UNITS
178
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
3.2 The
outdoor
ambient
temperatur
e in the
cooling
mode is
higher than
40°C
(
104
°
F)
.
Measure the
outdoor
ambient
temperature.
—— ——
It is a normal
phenomenon.
3.3 The
ambient
temperatur
e of the
IDU that
works in
the heating
mode is
lower than
12°C
(
54
°
F)
.
Measure the
outdoor
ambient
temperature.
3.3.1 The
system has
worked for
less than 2
hours.
——
It is a normal
phenomenon.
3.3.2 An
improper
system is
selected.
——
Choose
another
system with
larger power.
3.4 The
outdoor
ambient
temperatur
e in the
heating
mode is
lower than
-7°C.
Measure the
outdoor
ambient
temperature.
—— ——
It is a normal
phenomenon.
4. Poor
airflow
distribution
design
——
4.1 The air
intake and
return inlet
of the ODU
are too
close to
each other,
affecting
the heat
exchange
performance
of the unit.
Check the
distance.
—— ——
Re-design
the airflow
distribution.
4.2 The air
intake and
return inlet
of the IDU
are too
close to
each other,
causing
poor heat
exchange
of the unit.
Check the
distance.
—— ——
Re-design
the airflow
distribution.