Protection Against Contamination; To Braze The Pipe End; Using The Stop Valve And Service Port - Daikin VRV W T Serie Manual De Instalación

b
a
A
a
B
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
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
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 0.02 MPa (2.9 psi (i.e.
just enough so it can be felt on the skin)) with a pressure-reducing
valve.
RWEQ96~432TATJU + RWEQ96~432TAYDU
VRV W T-Series water-cooled system air conditioner
4P484115-1A – 2017.10
c
Protection method
Pinch the pipe
Pinch or tape the pipe
>Ø1 inch
1
2 2
1
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 .3 .9

Using the stop valve and service port

To handle the stop valve
▪ Make sure to keep all stop valves open during operation.
▪ The figure below shows the name of each part required in
handling the stop valve.
▪ The stop valve is factory closed.
a
b
c
d
a
Service port and service port cover
b Stop valve
c Field piping connection
d Stop valve cover
e d c
a b
a Service port
b Stop valve cover
c Hexagon hole
d Shaft
e Seal
To open the stop valve
1 Remove the stop valve cover.
2 Insert a hexagon wrench into the stop valve and turn the stop
valve counterclockwise.
3 When the stop valve cannot be turned any further, stop turning.
Result: The valve is now open.
To fully open the Ø3/4 inch~Ø1 inch stop valve, turn the hexagonal
wrench until a torque between 19.91 and 24.33 lbf·ft is achieved.
Inadequate torque may cause leakage of refrigerant and breakage of
the stop valve cap.
5 Installation
c d e
f
Installation manual
21