18 | Piping installation
Installer and user reference guide
92
REYQ8~20+REMQ5U7Y1B
VRV IV+ heat recovery
4P561154-1A – 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 Wait until all oil has dripped out before continuing with the connection of the
field piping in case the recovery was not complete.
18.3 Checking the refrigerant piping
18.3.1 About checking the refrigerant piping
Refrigerant piping works are
finished?
The indoor units and/or
outdoor unit were already
powered ON?
Use procedure:
"Method 2: After power ON".
Finish piping work.
Use procedure:
"Method 1: Before power ON
(regular method)".
Yes
No
No
Yes
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 "To
access mode 1 or 2" [4 124]). This setting will open field expansion valves to
guarantee a refrigerant piping pathway and make it possible to perform the leak
test and the vacuum drying.
DANGER: RISK OF ELECTROCUTION
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