Riello AARIA MULTI 250 P, Инструкции по установке и техническому обслуживанию, Страница: 24 / 40

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INSTALLATION
— bring line ends with flare connection close to their cou-
pling on the unit
— manually rotate the flare nuts by 3 - 4 turns
— tighten the connections using a spanner and a counter
spanner
9
Use a torque wrench to tighten so as to prevent damage to
flare nuts and gas leaks.
9
During the connection, keep the leak finder on and close to
the unit so that it signals any refrigerant leak.
9
Avoid using the refrigerant oil on the external part of the
flaring.
9
Models 475 - 485: if necessary use the adapter coupling 1/2"
at 3/8" supplied as a kit.
After connecting the cooling pipes:
— create a vacuum inside the pipes
— check for refrigerant leaks
— apply thermal insulating material on the joints
Pipe insulation
Connection pipes must be thermally insulated to prevent dis-
persions of heat or formation of condensate.
1 Gas pipe
2
Condensation discharge
3 Liquid pipe
4 Heat insulation
5 Adhesive tape
5
4
4
1
2
3
— insulate the liquid and gas pipes separately
— use insulating material that is thicker than 15 mm
—
ensure that the insulating material adheres to the pipe
without gaps
— fix using adhesive tape
9
Do not tighten the adhesive tape too much, so as to avoid
damaging the insulation.
9
Avoid partial insulation of the pipes.
9
In case of use with outdoor temperature above 30 °C and
relative humidity above 80%, increase wall thickness up to
20 mm.
For gas pipes:
— ensure that the material used resists to temperatures up
to 120°C
For liquid pipes:
— ensure that the material used resists to temperatures up
to 70°C
Stop valves
Cooling connections feature shut-off valves.
During operations on the cooling circuit, start-up and service, it
may be required to open and close the valves.
A Opening
B Closing
1 Service connection blanking plug
2 On-off valve shaft
3 Refrigerating pipe attachment
4 On-off valve cover plug
5 Hex wrench
1
2
3
4
5
A B
If required:
— remove the valve covering plug
— operate on the valve shaft with an hex wrench
—
open or close according to what is needed
— immediately stop as soon as the valve shaft has reached
the stop point
— use a torque wrench calibrated on the valve diameter
Pipe Ø
Hex
wrench
Valve
tightening
torque
Plug
tightening
torque
mm inches mm Nm Nm
6,35 1/4 5 6 25
9,52 3/8 5 6 25
12,70 1/2 5 8 30
15,88 5/8 5 10 35
9
Do not force beyond the stop point to prevent damaging the
shaft and causing leakage as a consequence.
At the end of the operations:
— refit the valve covering plug