2 6 Refrigeration connections
"
This appliance uses refrigerant R410A
Comply with the legislation for handling refrigerants.
2 6 1 Rules and precautions
• After every intervention on the refrigeration circuit and
before final connection, take care to replace the plugs
in order to avoid any pollution from the refrigeration
circuit.
•
Tools
- Set of manometers with hoses exclusively reserved
for HFCs (Hydrofluorocarbons).
- Vacuum pump specially for HFCs.
- Provision on using tools that have been in contact with
HCFCs (R22 for example) or CFCs.
- Use of a traditional vacuum pump is authorized if,
and only if, it is fitted with a non-return valve on the
suction side.
The manufacturer declines any liability with regard to the
guarantee if the above instructions are not observed.
•
Flared connections
"
Lubrication with mineral oil (for R12, R22)
is forbidden
- Only lubricate with polyolester refrigeration oil (POE).
If POE is not available, fit without lubrication.
• Brazing on the refrigeration circuit (if necessary)
- Silver brazing (40% minimum recommended).
- Brazing only under dry nitrogen internal flux.
• To eliminate any filings in the pipes, use dry nitrogen
to avoid introducing any humidity that may adversely
affect the appliances operation. In general, take every
precaution to avoid humidity penetrating into the
appliance.
• Proceed to insulate the gas and liquid pipes to avoid
any condensation. Use pipe insulators resistant to
temperatures over 90°C. In addition if the humidity
level in areas where the refrigeration pipes are
installed is expected to exceed 70%, protect the pipes
with pipe insulators. Use an insulating material thicker
than 15mm if the humidity level is 70~80%, and an
insulating material thicker than 20mm if the humidity
exceeds 80%. If the recommended thicknesses are
not observed under the conditions described above,
condensation will form on the surface of the insulation
material. Lastly, take care to use pipe insulators
whose thermal conductivity is 0.045 W/mK or less
when the temperature is 20°C. The insulation must be
impermeable to resist the passage of steam during the
defrosting cycles (fibreglass wool is prohibited).
2 6 2 Refrigeration connections
The outdoor unit must be connected to the hydraulic unit
only with copper pipes and connections (refrigeration
quality), insulated separately.
Comply with the pipe diameters and the permitted pipe
lengths (
The minimum length of the refrigeration connections
is 5 m for correct operation
The appliance will be excluded from guarantee if it is
used with refrigeration connections less than 5 m long.
Manipulate the pipes and take them through walls with
protective plugs in place.
Coat the flared surface
with
POE refrigeration oil
Do not use mineral oil
Installation and operating manual "1532 - EN"
Air to Water Heat Pump
- 16 -
