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

18 | Piping installation

18.3 Checking the refrigerant piping

18.3.1 About checking the refrigerant piping

Installer and user reference guide
92
WARNING
NEVER remove the spun piping by brazing.
Any gas or oil remaining inside the stop valve may blow off the spun piping.
6 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.
Method 2: After power ON
If the system has already been powered on, activate setting [2‑21] (refer to
access mode 1 or 2" [
guarantee a refrigerant piping pathway and make it possible to perform the leak
test and the vacuum drying.
DANGER: RISK OF ELECTROCUTION
Finish piping work.
No
Use procedure:
"Method 1: Before power ON
No
(regular method)".
4
124]). This setting will open field expansion valves to
"To
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VRV IV+ heat recovery
4P561154-1A – 2020.10