Ariston KYRIS PROtech 30 MD0 Installation Manual page 23

2.5 Thickness of the copper pipes
NOMINAL DIAMETER
(inches)
1/4
3/8
1/2
5/8
In the split-system type air conditioning units with R410A refrigerant, a
three-way valve on the external unit is used, with a pin valve.
2.6 How to connect the pipes
1. Remove the closing plugs from the piping only immediately before you
make the connection: prevent all dirt and moisture from entering the pip-
ing.
2. 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 fi gure.
3. 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 fl ange at the end of the connection
pipe, following the instructions in the table (for copper pipes):
ø ø
NOMINAL EXTERNAL THICKNESS
1/4 6,35
3/8 9,52
1/2 12,70
5/8 15,88
4. Connect the pipes using two spanners, taking care not to damage the
piping. If the tightening force is insuffi cient, then there may well be leaks.
And if the tightening force is too much, then there may also be leaks as
the fl ange could be damaged. The safest method lies in tightening the
connection using a fi xed spanner and a dynamometric one: in this case,
use the table "tightening torque for fl ange connections".
5. We recommend you leave an extra 50 cm of 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 insuffi cient, then there may well be leaks. And
if the tightening force is too much, then there may also be leaks as the
fl ange could be damaged.
- The safest method lies in tightening the connection using a dynamomet-
ric spanner: in this case, use the following tables (for copper pipes)
EXTERNAL DIAMETER
(mm)
6,35
9,52
12,70
15,88
MEASUREMENT "A"
mm
mm
PIPE VICE
0,8 0-0,5
0,8 0-0,5
0,8 0-0,5
0,8 0-0,5
THICKNESS
(mm)
0,8
0,8
0,8
1,0
CONVENTIONAL PIPE VICE
CLAMP-
BUTTERFLY
SHAPED
1,0-1,5 1,5-2,0
1,0-1,5 1,5-2,0
1,0-1,5 2,0- 2,5
1,0-1,5 2,0-2,5
YES NO
DYNAMOMETRIC SPANNER
CONNECTION PIPES
PIPE UNIONS
LIQUID COCK
GAS COCK
GB
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