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3 Piping work and refrigerant charge
Copper pipes, sizes, connection and insulation
3.2.2 Pipe connection
End of refrigerant pipe protected correctly.
Cover the end of the pipe appropriately when it is to be inserted through holes in walls and roofs, etc.
Keep the ends of the pipes covered while other installation work is being carried out to avoid the entry of dampness or
dirt.
End of refrigerant pipe unprotected.
Do not place the pipes directly on the ground without appropriate protection or adhesive vinyl tape to cover the ends.
Where the pipe installation is not completed for a certain amount of time, weld the ends of the pipe to seal. Then fill it with
oxygen-free nitrogen gas through a Schrader valve to avoid the accumulation of humidity and/or contamination through
dirt.
Secure the connection pipe as indicated in the image. Use the indoor
unit's insulation.
A: flare nut on the indoor unit.
B: insulation on the pipe connection to the indoor unit using the
insulating material supplied.
C: s ecure the insulation using the flange supplied or using suitable
adhesive tape.
D: Installation refrigerant gas pipe.
E: installation insulation (field-supplied).
F: brazing.
G: flare the pipe after inserting the flare nut.
H: indoor unit insulation.
I: indoor unit.
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N O T E
•
Where polyethylene foam insulation is used, a 10 mm thick layer should be used for the liquid pipe and between 15 and 20 mm for
the gas pipe.
•
Install the insulation after the pipe surface temperature has dropped to the room temperature, otherwise the insulation may melt.
Do not use insulating material that contains NH
subsequently cause leaks.
Where the fitter has supplied his own branches, these should be appropriately insulated to avoid decreases in capacity in
line with to environmental conditions and condensation on the surface of the piping due to low pressure.
3.2.3 Insulation of multikits and/or branches
Install the insulation packages in the multikits and/or branches using suitable vinyl tape.
98
SMGB0099 rev.0 - 12/2016
(ammonium), as it could damage the copper in the pipe and
3
A
B
I
H
G
F
C
D
E
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