Checking The Refrigerant Piping; About Checking The Refrigerant Piping - Daikin VRV 5 S Series Installer And User Manual

18 | Piping installation

18.3 Checking the refrigerant piping

18.3.1 About checking the refrigerant piping

Installer and user reference guide
92
a Horizontal surface
b Refnet joint mounted vertically
c Refnet joint mounted horizontally
d Header
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
"22.2.4 To access mode 1 or
valves to guarantee a refrigerant piping pathway and make it possible to perform
the leak test and the vacuum drying.
DANGER: RISK OF ELECTROCUTION
NOTICE
Make sure that all indoor units connected to the outdoor unit are powered on.
NOTICE
Wait to apply setting [2‑21] until the outdoor unit has finished the initialisation.
Leak test and vacuum drying
Checking the refrigerant piping involves:
Finish piping work.
No
Use procedure:
"Method 1: Before power ON
No
(regular method)".
4
2" [ 124]). This setting will open field expansion
RXYSA4~6A7V/Y1B
VRV 5-S system air conditioner
4P600330-1D – 2023.02