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 nal 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.
- 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 tted 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, t without lubrication.
2.6.2 Refrigeration connections
The outdoor unit must be connected to the hydraulic
unit with copper pipes and connections (refrigeration
quality), insulated separately.
Comply with the pipe diameters and the permitted pipe
lengths (gure 13).
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.
2.6.3 Accessing the hydraulic module’s
refrigerant connections
- Remove the front panel (2 screws A, gure 16).
- Remove the left-hand panel (2 screws B, gure 17).
Coat the ared surface with
POE refrigeration oil.
Do not use mineral oil.
• Brazing on the refrigeration circuit (if necessary)
- Silver brazing (40% minimum recommended).
- Brazing only under dry nitrogen internal ux.
• To eliminate any lings 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 (breglass wool is prohibited).
1
A
1
A
2
gure 16 - Removing the front panel
Installation and operation manual "1397 - EN"
Heat pump split single service alféa Evolution
- 16 -
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