Checking The Refrigerant Piping; About Checking The Refrigerant Piping - Daikin VRV IV W+ Series Installer And User Reference Manual

18.4 Checking the refrigerant piping

18.4.1 About checking the refrigerant piping

RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452191-1B – 2020.10
WARNING
NEVER remove the spun piping by brazing.
Any gas or oil remaining inside the stop valve may blow off the spun piping.
6 Make sure that no particles remain in the pipe. Blow out any particles with
compressed air.
7 Wait until all oil has dripped out before continuing with the connection of the
field piping in case the recovery was not complete.
Refrigerant piping works are
finished?
Yes
The indoor units and/or
outdoor unit were already
powered ON?
Yes
Use procedure:
"Method 2: After power ON".
It is very important that all refrigerant piping work is done before the units
(outdoor or indoor) are powered on. When the units are powered on, the
expansion valves will initialise. This means that the valves will close.
NOTICE
Leak test and vacuum drying of field piping and indoor units is impossible when field
expansion valves are closed.
Method 1: Before power ON
If the system has not yet been powered on, no special action is required to
perform the leak test and the vacuum drying.
Finish piping work.
No
Use procedure:
"Method 1: Before power ON
No
(regular method)".
18 Piping installation
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Installer and user reference guide
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