Multi Connection Piping Kit Connection; To Connect The Refrigerant Branching Kit; Protection Against Contamination; To Braze The Pipe End - Daikin VRV W T-Series Installation Manual

5 .3 .5

Multi connection piping kit connection

NOTE
Improper installation may lead to malfunction of the outside
unit.
▪ Install the joints horizontally, so that the caution label (a) attached
to the joint comes to the top.
▪ Do not tilt the joint more than 15° (see view A).
▪ Do not install the joint vertically (see view B).
15°
A
15°
a
a Caution label
X Not allowed
O
Allowed
▪ Make sure that the total length of the piping connected to the joint
is absolute straight for at least 19-11/16 inch (500 mm). Only if a
straight field piping of more than 4-3/4 inch (120 mm) is
connected, more than 19-11/16 inch (500 mm) of straight section
can be ensured.
5 .3 .6

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.
b
a
A
a
B
a Horizontal surface
b Refnet joint mounted vertically
c Refnet joint mounted horizontally
RWEQ96~432TAYCU
VRV W T-Series water-cooled system air conditioner
4P540122-1B – 2018.11
B
a
A >4-3/4 inch (120 mm)
B >19-11/16 inch (500 mm)
c
5 .3 .7

Protection against contamination

Protect the piping as described in the following table to prevent dirt,
liquid or dust from entering the piping.
Unit Installation period
Outside unit >1 month
<1 month
Indoor unit Regardless of the
period
Seal the piping and wiring intake holes using sealing material (field
supply), otherwise the capacity of the unit will drop and small
animals may enter the machine.
If the gaps are not properly sealed, sound level will increase and
sweat problems can occur.
5 .3 .8

To braze the pipe end

NOTE
Precautions when connecting field piping. Add brazing
material as shown in the figure.
≤Ø1 inch (25.4 mm)
1
1
▪ When brazing, blow through with nitrogen to prevent creation of
large quantities of oxidised film on the inside of the piping. This
film adversely affects valves and compressors in the refrigerating
system and prevents proper operation.
▪ The Dry Nitrogen pressure should be set to 2.9 psi (0.02 MPa (i.e.
just enough so it can be felt on the skin)) with a pressure-reducing
valve.
a b
f
a Refrigerant piping
b Part to be brazed
c Taping
d Manual valve
e
Pressure-reducing valve
f Nitrogen
▪ Do NOT use anti-oxidants when brazing pipe joints.
Residue can clog pipes and break equipment.
▪ Do NOT use flux when brazing copper-to-copper refrigerant
piping. Use phosphor copper brazing filler alloy (BCuP), which
does not require flux.
Flux has an extremely harmful influence on refrigerant piping
systems. For instance, if chlorine based flux is used, it will cause
pipe corrosion or, in particular, if the flux contains fluorine, it will
deteriorate the refrigerant oil.
5 Installation
Protection method
Pinch the pipe
Pinch or tape the pipe
>Ø1 inch (25.4 mm)
1
2 2
1
c d e
f
Installation manual
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