Refrigeration Connections; Rules And Precautions - Fujitsu Waterstage Split Comfort 5 Series Installation Manual

Refrigeration connections

This appliance uses refrigerant R32.
Comply with the legislation on handling of refrigerants.
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Rules and precautions

Connections must be made on the same day
the installation is fi lled with gas (see para.
"Filling the installation with gas", page
• Minimum tools required
- Set of pressure gauges (Manifold) with hoses
exclusively designed for HFCs (Hydrofl uorocarbons).
- Vacuum gauge with isolation valves.
- Vacuum pump specifi cally for HFCs (using a standard
vacuum pump is allowed if, and only if, it is fi tted with
a non-return valve on the suction side).
- Flaring tool, Pipe-cutter, Deburring tool, Spanners.
- Certifi ed refrigerant leak detector (sensitivity 5g/year).
Using tools that have been in contact with
HCFCs (R22 for example) or CFCs is prohibited.
The manufacturer declines any liability with
regard to the warranty if the above instructions
are not observed.
• Flared connections
Lubricating with mineral oil (for R12, R22)
is prohibited.
- Lubricate only with alkylbenzene oil. If alkylbenzene
oil is not available, fi t without lubrication
• Brazing the refrigeration circuit (if necessary)
- Silver brazing (40% minimum recommended).
- Brazing only with dry nitrogen internal fl ux.
- 26 -
72).
Coat the fl ared surface
with alkylbenzene oil.
Do not use mineral oil.
Waterstage Split Comfort DHW Serie / INSTALLATION / 2125 - EN
• Other remarks
- After each maintenance operation on the refrigeration
circuit and before fi nal connection, take care to put
the caps back in position to avoid any pollution of the
refrigeration circuit.
- To eliminate any fi lings getting into the pipes, use dry
nitrogen to avoid introducing any humidity that may
adversely aff ect the appliance's operation. In general,
take every precaution to avoid humidity penetrating
into the appliance.
- Proceed with the thermal insulation of the pipes /
connections / refrigeration fi ttings in order to avoid
any condensation. Use insulating sleeves resistant
to temperatures above 90 ° C, at least 15mm thick if
the humidity reaches 80% and at least 20mm if the
humidity exceeds 80%. The thermal conductivity of
the insulation is less than or equal to 0.040 W / mK.
The insulation must be waterproof to resist the
passage of steam during the defrost cycles.
Glass wool is prohibited.