To Connect The Refrigerant Branching Kit; Checking The Refrigerant Piping; About Checking The Refrigerant Piping - Daikin VRV IV-S RXYSQ4T8VB Series Installation And Operation Manual

14 Piping installation
Possibility 3: To the side
d e1 e f
A
c1
c
c, c1 Gas piping accessory 1 + copper gasket (always use it)
d Gas piping accessory 2
e, e1 Gas piping accessory 3 (cut it to the required length)
f Field supply
4 Reattach the service cover and the piping intake plate.
5 Seal all gaps (example: a) to prevent snow and small animals
from entering the system.
a
WARNING
Provide adequate measures to prevent that the unit can be
used as a shelter by small animals. Small animals that
make contact with electrical parts can cause malfunctions,
smoke or fire.
NOTICE
Make sure to open the stop valves after installing the
refrigerant piping and performing vacuum drying. Running
the system with the stop valves closed may break the
compressor.
14.2.9

To connect the refrigerant branching kit

For installation of the refrigerant branching kit, refer to the installation
manual delivered with the kit.
▪ Mount the refnet joint so that it branches either horizontally or
vertically.
▪ Mount the refnet header so that it branches horizontally.
Installation and operation manual
22
Possibility 4: Downwards
A
A
c
c
e
e1
f
b
a
A
a
B
a Horizontal surface
b Refnet joint mounted vertically
c Refnet joint mounted horizontally
14.3

Checking the refrigerant piping

14.3.1

About checking the refrigerant piping

Refrigerant piping works are
finished? No
Yes
The indoor units and/or
outdoor unit were already
No
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 "To access mode 1 or
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
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.
c
Finish piping work.
Use procedure:
"Method 1: Before power ON
(regular method)".
2" [ 4 29]). This setting will open field
RXYSQ4~6T8V/YB(*)
VRV IV-S system air conditioner
4P482275-1B – 2020.10