D-EIMHP01505-22_00EN 34/59
a) Refrigerant piping
b) Part to be brazed
c) Taping
d) Manual value
e) Pressure-reducing valve
f)
Nitrogen
Figure 22
– Pipe Brazing
▪
Do NOT use antioxidants 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 any 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.
6.2. Using the ball valve
The outdoor unit is shipped with ball valves in
CLOSED
position. The piping connections are sealed with a plug which is
brazed to the connection. To install the piping system, it is necessary to remove the seal plugs.
Figure 23
– Ball-Valve
Before removing the plugs on the piping connections, ensure that the ball valves are in CLOSED
position.
Before removing the plugs on the piping connections, it is possible to check the absence of refrigerant
through the charging ports mounted on each side of the unit. Check for refrigerant leaking through the
ball valves.
In case of presence of refrigerant, this must be removed before removing the plugs on the piping
connections and during all the brazing processes.
•
The outdoor unit is shipped with refrigerant inside (pre-charge). The quantity varies for each model.
•
The indoor unit is shipped with nitrogen inside.
To open/close the ball valve
1
Remove the ball valve cover.
2
Turn the pin with the use of adjustable wrench until they stop turning.
3
When the stop valve CANNOT be turned any further, stop turning. The valve is now open/closed.
Do NOT apply excessive force to the stop valve. Doing so may break the valve body.
