Pipe Bending Guidelines; To Braze The Pipe End; Using The Stop Valve And Service Port - Daikin LRMEQ4BY1 Installer And User Manual

6 Installation
NOTICE
Take the following precautions on refrigerant piping into
account:
▪ Avoid anything but the designated refrigerant to get
mixed into the refrigerant cycle (e.g. air).
▪ Only use R410A when adding refrigerant.
▪ Only use installation tools (e.g. manifold gauge set) that
are exclusively used for R410A installations to
withstand the pressure and to prevent foreign materials
(e.g. mineral oils and moisture) from mixing into the
system.
▪ Protect the piping as described in the following table to
prevent dirt, liquid or dust from entering the piping.
▪ Use caution when passing copper tubes through walls.
Unit Installation period
Outdoor unit >1 month
<1 month
Indoor unit Regardless of the
period
INFORMATION
Do NOT open the refrigerant stop valve before checking
the refrigerant piping. When you need to charge additional
refrigerant it is recommended to open the refrigerant stop
valve after charging.
6.4.3

Pipe bending guidelines

Use a pipe bender for bending. All pipe bends should be as gentle
as possible (bending radius should be 30~40 mm or larger).
6.4.4

To braze the pipe end

NOTICE
Precautions when connecting field piping. Add brazing
material as shown in the figure.
≤Ø25.4
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.
▪ Set the nitrogen pressure to 20 kPa (0.2 bar) (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.
Installer and user reference guide
16
Protection method
Pinch the pipe
Pinch or tape the pipe
c d e
f
▪ 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.
6.4.5

Using the stop valve and service port

To handle the stop valve
▪ Make sure to keep all stop valves open during operation.
▪ The stop valves are factory closed.
▪ The figure below shows the name of each part required in
handling the stop valve.
a
b
c
d
a Service port and service port cover
b Stop valve
c Field piping connection
d Stop valve cover
a b
e d c
a Service port
b Stop valve cover
c Hexagon hole
d Shaft
e Seal
NOTICE
In addition to a gas and liquid stop valve, the outdoor unit
has two maintenance stop valves. When connecting the
refrigerant piping to the outdoor unit, do NOT operate the
maintenance stop valves. The factory setting for these
valves is "open". When operating the unit, always leave
these valves in the open position. Operating the unit with
the valves in the closed position may cause the
compressor to fail.
a
a
a Maintenance stop valve
To open the stop valve
1 Remove the stop valve cover.
LRMEQ+LRLEQ3+4BY1
Air-cooled refrigeration condensing unit
4P500362-1A – 2018.09