Refrigerant Pipe Insulation - Hitachi UTOPIA R32 Series Installation And Operation Manual

!
CAUTION
• Do not braze on refrigerant pipes without a dry nitrogen gas injection system. Otherwise, a layer
of rust will form that may become detached when the refrigeration system is started, causing
filter or compressor blockages.
• NEVER USE oxygen, acetylene or fluorocarbonated gas to replace nitrogen gas: this will cause an
explosion or will generate toxic gas.
• Keep the nitrogen gas pressure within the indicated values. A rise in the pipe could cause an
explosion.

5.5 Refrigerant pipe insulation

The refrigerant pipes must be fitted with a suitable insulation system that prevents the increase in
temperature of the refrigerant and the subsequent loss of energy and the condensation of water
along the entire pipe.
Refrigerant pipes must always be separately insulated, using closed cell insulation foam designed
especially for refrigeration. This insulation foam, supplied by the installer, can be obtained in
different formats. The most common is in the form of sheets and rolls of tubes of different
diameters.
Furthermore, all connections between the different sections of insulation tubes must be reinforced
with adhesive tape of the same characteristics.
!
CAUTION
• On completing the installation of the refrigerant pipes, insulate the unions and flare-nuts at
the piping connection part completely, insulate them appropriately using suitable insulating
material and seal the open space between the holes made and the pipe.
• For units with air panel: If coating the optional air panel with a forming agent (recommended
Gupoflex) after installation, make sure that the forming agent does not contact it. Otherwise, it
could cause a breakage of the panel, resulting in the panel falling. If the forming agent contacts
the air panel, completely wipe it off.
PMEN0654 rev.0 - 12/2023
Fasten securely cord clamps and
the vinyl tape in order to prevent
the pipe from dew condensation
Fix the vinyl tape position at the vertical part
Fasten 3 places of the
(Insulation for refrigerant pipe (field-supplied))
pipe by cord clamps
(field-supplied)
Unit side
Insulation material
(factory-supplied)
Check no clearance between the indoor
unit and the insulation
Refrigerant pipe
(field-supplied)
Insulation for refrigerant pipe
(field-supplied)
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