10.6. Specifications of the refrigerant pipes
Outdoor unit
(kW)
Max. piping
length with
Standard
refrigerant
load
For every meter
exceeding the
standard length of
the liquid pipe
Total maximum length
of the liquid pipes
Maximum length of
the liquid pipe (L
X
) for
each single unit
Maximum height difference between
units
Total lengths of the
liquid pipes of each
single unit
Indoor - Indoor
Indoor - Outdoor
Outdoor is
down
Outdoor is
up
[m]
[g/m]
[m]
[m]
H [m]
H1 [m]
H2 [m]
Dual (4,1kW)
10
20
L1+L2=20m
10
5
5
5
Dual (5,2kW)
10
20
L1+L2=20m
10
5
5
5
Trial (6,1kW)
30
20
L1+L2+L3=60m
20
10
10
10
Trial (7,1kW)
30
20
L1+L2+L3=60m
20
10
10
10
Quadri (10,2kW
)
40
20
L1+L2+L3+L4=70m
20
10
10
10
Penta (14,5kW)
40
20
L1+L2+L3+L4+L5=75m
25
7,5
15
15
When the total length of the liquid pipes is less than or equal to the length indicated in the table, there is no need to
add refrigerant gas, while if the total length of the liquid pipes is longer than the total length indicated in the table,
refrigerant gas must be added.
The above table shows the quantity of refrigerant gas to add, according to the models, for each additional metre of
piping.
Nota: Longer connection pipe will reduce the efficiency of the system.
10.7 Table with the tightening torques of refrigerator fittings
Diameter (inch)
Pipe thickness (mm)
Tightening torque (Nm)
1/4”
≥0,8
15-30
3/8”
≥0,8
35-40
1/2”
≥1
45-50
5/8”
≥1
60-65
3/4”
≥1
70-75
7/8”
≥1
80-85
10.8 Refrigerant connections
Comply with the following indications when connecting the cooling pipes:
- Match the ends of the previously flared pipe with those of the connections on the
interior and exterior units.
- Tighten the union by hand and then torque it with the aid of an adequate wrench (it
is advisable to use a fox wedge to prevent tensions from being created on the pipes).
- If necessary must be used an adapter (1) (see the figure in the right side) to enable
correct connection.
Repeat the operation for the second cock.
Mod. 2600 W, 3500 W
Mod. 5300 W
10.9 Notes on refrigerant pipes preparations
•
Use material and tools that are special for the refrigerant gas R32.
•
When connecting or disconnecting the refrigerator line to or from the unit, use both keys, torque wrench and secure.
•
Refer to the table to check the torque to apply to the fittings (excessive tightening would deform the bolt resulting in
leakages).
•
When connecting the refrigerant fittings with the pipes, tighten the bolts 3 or 4 times with a torque wrench, both on
the indoor unit and on the outdoor unit.
•
Ensure that there are no gas leaks from the fittings.
• Cover the refrigerant fittings again with insulating material.
• Identify the pipes and fittings with symbols or wording.
• Adjust the length of the pipes.
• The diameter of the refrigerator pipes depends on the indoor unit applied. The outdoor units are supplied with
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