2.9 Refrigerant
connections
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2.9.1 Rules and precautions
After every intervention on the refrigeration circuit and
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order to avoid any pollution from the refrigeration circuit.
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- Set of manometers (
Manifold
) with hoses exclusively
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- Vacuum gauge whith isolation valves.
- Vacuum pump specially for HFCs (use of a traditional
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with a non-return valve on the suction side).
- Flaring tool.
- Pipe-cutter.
- Deburring tool.
- Wrenches.
-
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is not allowed.
- Only lubricate with polyolester refrigerating oil (POE).
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refrigerating oil POE
.
Do not use mineral oil.
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- Silver brazing (40% minimum recommended).
- Brazing with a dry Nitrogen stream only.
To eliminate the swarf from the pipes, use dryNitrogen to
avoid introducing humidity that can harm the operation
of the appliance. In general, take all precautions to
avoid humidity penetrating into the appliance.
Thermally insulate the gas and liquid pipe to avoid
all condensation. Use insulating sleeves that resist
temperatures of over 90°C. In addition, if the level of
humidity where the refrigerating pipes risks exceeding
70%, protect them with insulating sleeves. Use a
15 mm thicker sleeve if the humidity reaches 80%, and
a 20 mm thicker sleeve if the humidity exceeds 80%.
If the recommended thicknesses are not respected
in the conditions described above, condensation will
form on the surface of the insulation. Finally, ensure
that insulating sleeves are used that have a thermal
conductivity equal to 0.045 W/mK or lower when the
temperature is equal to 20°C. The insulation must be
impermeable to resist the steam passing during the
defrosting cycles (glass wool is prohibited).
2.9.2 Refrigerating connections
The outdoor unit must be connected to the hydraulic
unit
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with new copper pipes and connections
(refrigeration quality), insulated separately.
Respect the diameters of pipe and the authorised
lengths (
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).
If the refrigeration connections are exposed to
weathering or UV- and the insulation is not strong, it is
necessary to provide protection.
The minimum length of the cooling links if 5 m for
correct operation.
The appliance's warranty will be void if it is applied with
cooling links that are shorter than 5 m.
Handle the pipes and pass them through the walls
withthe protection plugs in place.
Installation and commissioning instructions "1485 - EN"
- 25 -
Heat pump alféa hybrid duo gas
