(9) Filter and Drier Installation for the ODU
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/ft
2
) 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
heating mode for 24 hours: (1) Power off all units. (2) Turn off the two stop valves of the liquid pipe. (3)
Remove the drier filter. (4) Short connect with a copper pipe with the same caliber and vacuumize the
pipe. (5) Turn on the two stop valves and keep normal running.
6.2 Pipe Installation for the Condensate Water System
6.2.1 Pipes
Generally, U-PVC water supply pipes bonded with special glue are adopted as condensate water
pipes. PP-R, PP-C, and hot galvanized steel pipes can also be adopted. Aluminium plastic compound
pipes cannot be used.
6.2.2 Requirements on Installation
(1) Determine the direction and elevation of a condensate water pipe before installing it. Avoid
overlapping it with other pipes to ensure straight inclination. The clamp of the pipe hanger is
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