Gree GMV5 - Page 167

GREE Photovoltaic Direct-driven Inverter Multi VRF Units
163
Feedback from
user
Exception
Possible reasons
Solution
Primary reason Secondary reason Tertiary reason
Description
Confirmation
method
Description
Confirmation
method
Description
Confirmati
on
method
Poor
heating/cooling
performance
A. When the IDU
is working in the
cooling mode
and the electronic
expansion valve
is opened to the
max., 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;
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.
7. Not enough
refrigerant
Other reasons
Incorrect quantity of
refrigerant is injected.
—— —— ——
Check the
necessary
amount of
refrigerant and
inject
refrigerant
slowly via the
stop valve of
the
low-pressure
air pipe.
2.3.4 Exception Analyzing and Troubleshooting
2.3.4.1 “A0” Unit debug status
Error display:
ODU mainboard, IDU wired controller and IDU receive light board will
display
Error judgment condition and method:
This code is status code. When the engineering debugging is not completed, the unit will display this
code, at this time, the unit cannot startup for operation.
Possible reason
：
——
Troubleshooting:
status code, no troubleshooting.
2.3.4.2 “A2” Refrigerant recovery operation status
Error display:
ODU mainboard, IDU wired controller and IDU receive light board will
display
Error judgment condition and method:
This code is status code, which means the system has entered into refrigerant recovery status, and
the unit will start up for operation automatically.