Daikin VRV W T-series - Schedule; Setting the schedule

5 Installation
Installation manual
21
RWEQ96~432TAYCU
VRV W T-Series water-cooled system air conditioner
4P540122-1B – 2018.11
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).
a
a
A B
15°
15°
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.
A >4-3/4 inch (120 mm)
B >19-11/16 inch (500 mm)
A
B
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.
A
B
±
3
0
°
a
b
c
a
a Horizontal surface
b Refnet joint mounted vertically
c Refnet joint mounted horizontally
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 Protection method
Outside unit >1 month Pinch the pipe
<1 month Pinch or tape the pipe
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.
1
1
1
1
2 2
≤Ø1 inch (25.4 mm) >Ø1 inch (25.4 mm)
▪ 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 c d e
f
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.