Gree GMV5

GREE Photovoltaic Direct-driven Inverter Multi VRF Units
58
6.1.3.8 During refrigerant pipe installation, ensure a distance above 500 mm (19.7inch)
between the pipe and the electric box of the unit for maintenance. In a case when the space
is not enough, the final piping way must be determined by the technical personnel.
 When installing and moving the air conditioner to another site, be sure to make recharge
refrigerant after perfect evacuation.
As the piping for the VRF system is complex, it is recommended that a filter is installed for the gas
pipe and a drier is installed for the liquid pipe during construction. This ensures aridity and cleanness of
the piping system and further improves the operation stability of the system.
The procedure is as follows:
First, weld a stop valve with the corresponding caliber to the gas pipe and liquid pipe at the position
relatively close to the ODU and easy for operation.
Second, install a filter (100 mesh/ft2) between the added stop valve outside the gas pipe and the
stop valve of the ODU. Then install a drier filter between the added stop valve outside the liquid pipe and
the stop valve of the ODU.
Lastly, after the test run is complete,
To remove the filter from the gas pipe after starting all IDUs and keeping them running cooling mode
for 24 hours: (1) Power off all units. (2) Turn off the two stop valves of the gas pipe. (3) Remove the filter.
(4) Short connect with a copper pipe with the same caliber and vacuumize the pipe. (5) Open the two
stop valves and keep normal running.
To remove the drier filter from the liquid pipe after starting all IDUs and keeping them running in
 When all of the pipes of indoor unit finish welding, dry nitrogen must be used to blow and
clean the pipes. Otherwise, the remaining substance in pipeline will cause blockage or leakage
to the system (e.g. electronic expansion valve), which result in abnormal operation or even
damage the compressor.