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

6.5 Checking the refrigerant piping

6.5.1 About checking the refrigerant piping

RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546228-1A – 2019.10
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 they will close. Leak test and vacuum drying of field piping and indoor units is
impossible when this happens.
Therefore, there will be explained 2 methods for initial installation, leak test and
vacuum drying.
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
"7.2.4 To access mode 1 or
to guarantee a refrigerant piping pathway and make it possible to perform the leak
test and the vacuum drying.
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:
▪ Checking for any leakages in the refrigerant piping.
▪ Performing vacuum drying to remove all moisture, air or nitrogen in the
refrigerant piping.
If there is a possibility of moisture being present in the refrigerant piping (for
example, water may have entered the piping), first carry out the vacuum drying
procedure below until all moisture has been removed.
All piping inside the unit has been factory tested for leaks.
Finish piping work.
No
Use procedure:
"Method 1: Before power ON
No
(regular method)".
4
2" [ 86]). This setting will open field expansion valves
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