3.1.2 Pipe connection
Fix the connecting pipe as shown in the figure below. Use the insulation attached to the indoor unit.
Use the flare
nut of the
indoor unit
Insulate this part
with the insulation
material supplied
Fix this part with the
bracket supplied or
with tape
Refrigerant piping
in the installation
Field-supplied
insulation
Solder
Make flares after
attaching flare nut to
the connecting pipe in
the Multikit package
Insulation attached
to indoor unit
Indoor
unit
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N O T E
A system with no moisture or oil contamination will give maximum performance and life-cycle as compared with a poorly prepared system.
Take particular care to ensure that all copper piping is clean and dry internally. To ensure this, blow oxygen free nitrogen through the pipes.
• Cap the end of the pipe when the pipe is to be inserted through a hole.
• Do not place pipes directly on the ground without a cap or vinyl tape covering the end.
Correct
Wrong
• If piping installation cannot be completed until the following day or longer, solder the ends of the piping to close
them and load with oxygen-free nitrogen using an access device such as a Schrader valve to avoid moisture and
contamination by extraneous particles.
• Do not use insulation material containing NH3 as it can damage the copper piping material and may be a source of
future leakage.
3.1.3 Insulation
Attach insulation package with the Multikit to each branch using vinyl tape. Also attach insulation to field-supplied piping
to prevent capacity decrease due to ambient air conditions and dewing on pipe surface caused by low pressure.
?
N O T E
When polyethylene foam is applied a thickness of 10mm for the liquid piping and 15mm to 20mm for the gas piping is recommended.
1
Cap.
2
Field supplied insulation.
3
Do not make a gap.
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C A U T I O N
•
Perform insulation work when the surface temperature reaches the room temperature. Otherwise it is possible that the insulation will
melt.
•
If the ends of the piping system are open after accomplishing piping work securely attach caps or vinyl bags to the ends of the piping
avoiding the invasion of moisture and dust.
3 Piping work and refrigerant charge
Piping work connection considerations
SMGB0091 rev.2 - 11/2015
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