Daikin RXYSQ4T7V1B, Installation And Reference Manual, Page: 20 / 64

6 Installation
Installer and user reference guide
20
RXYSQ4~Y1B
VRV IV-S system air conditioner
4P404676-1A – 2016.03
4 Do the following:
▪ Connect the liquid pipe (a) to the liquid stop valve.
▪ Connect the gas pipe (b) to the gas stop valve.
a
b
▪ In case of RXYSQ6: Connect the gas piping accessories (c,
c1, d, e), and cut them to the required length (e1). This is
necessary because the size of the gas stop valve is Ø15.9
while the piping between outdoor unit and first refrigerant
branch kit is Ø19.1.
Possibility 1: To the front
A
e1 e
c
d f
Possibility 2: To the back
A
c
d e f
Possibility 3: To the side
A
c
d e1 e f
Possibility 4: Downwards
A
c
e1
f
e
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
5 Reattach the service cover and the piping intake plate.
6 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.
6.4.9 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.
A
B
±3
0
°
a
b
c
a
a Horizontal surface
b Refnet joint mounted vertically
c Refnet joint mounted horizontally
6.5 Checking the refrigerant piping
6.5.1 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 they will close. Leak test and vacuum drying of field
piping and indoor units is impossible when this happens.