MANUALE PER L'INSTALLAZIONE - enrdd.com

2.5 Thickness of the copper pipes
NOMINAL DIAMETER EXTERNAL DIAMETER THICKNESS
(inches) (mm) (mm)
1/4 6,35 0,8
3/8 9,52 0,8
1/2 12,70 0,8
5/8 15,88 1,0
In the split-system type air conditioning units with R410A refrigerant, a threeway
valve on the external unit is used, with a pin valve that has a different
diameter from the R22 machines, in order to prevent the units from accidentally
being recharged with another type of refrigerant.
In addition, to increase resistance to pressure, for copper tubes with a nominal
diameter of 1/2” and 5/8”, the operating dimensions of the pipe connection
as well as the pipe unions on the opposite side were changed.
2.6 How to connect the pipes
· Remove the closing plugs from the piping only immediately before you
make the connection: prevent all dirt and moisture from entering the
piping.
· If a pipe is bent too many times, it becomes hard: do not bend the same
section more than three times. Unwind the pipe without pulling on it, as illustrated
in the figure.
· The insulation around the copper pipes must be at least 6 mm thick.
2.7 Connections to the internal unit
1. Shape the connection pipes well following the outline.
2. Remove the end cap from the pipes of the internal unit (check that no
impurities have been left inside).
3. Insert the pipe union and position the flange at the end of the connection
pipe, following the instructions in the table.
ø ø mm MEASUREMENT CONVENTIONAL
NOMINAL EXTERNAL THICKNESS “A” mm clamp-shaped PIPE VICE
PIPE VICE for R410A clamp-shaped butterfly
1/4 6,35 0,8 0-0,5 1,0-1,5 1,5-2,0
3/8 9,52 0,8 0-0,5 1,0-1,5 1,5-2,0
1/2 12,70 0,8 0-0,5 1,0-1,5 2,0-2,5
5/8 15,88 1,0 0-0,5 1,0-1,5 2,0-2,5
4. Connect the pipes using two spanners, taking care not to damage the
piping. If the tightening force is insufficient, then there may well be leaks.
And if the tightening force is too much, then there may also be leaks as the
flange could be damaged. The safest method lies in tightening the connection
using a fixed spanner and a dynamometric one: in this case, use
the table “tightening torque for flange connections”.
5. We recommend you leave an extra 50 cm of copper pipe for any subsequent
work carried out in the vicinity of the cocks.
2.8 Connections to the external unit
Screw the pipe unions onto the external unit connections with the same tightness
as for the internal unit.
To avoid leaks, pay particular attention to the following points:
· Tighten the pipe unions, taking care not to damage the piping.
· If the tightening force is insufficient, then there may well be leaks.
And if the tightening force is too much, then there may also be leaks as the
flange could be damaged.
· The safest method lies in tightening the connection using a dynamometric
spanner: in this case, use the following table.
YES
pipe
unions
connection piping
45°~ 46°
liquid cock
B A
gas cock
NO
43°~ 45°
dynamometric
spanner
C D
25