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30
Multi F Standard Wall-Mounted Indoor Unit
Due to our policy of continuous product innovation, some specifications may change without notification.
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MA
X
MUL
TI
F
MUL
TI
F
Pipes used for the refrigerant piping system must include the specified thickness, and the
interior must be clean.
While handling and storing, do not bend or damage the pipes, and take care not to contami-
nate the interior with dust, moisture, etc. See Table 18 for care of piping.
Dry Clean Airtight
Principles No moisture should be inside the piping. No dust should be inside the piping. No leaks should occur.
Problems
Caused
- Significant hydrolysis of refrigerant oil.
- Refrigerant oil degradation.
- Poor insulation of the compressor.
- System does not operate properly.
- EEVs, capillary tubes are clogged.
- Refrigerant oil degradation.
- Poor insulation of the compressor.
- System does not operate properly.
- EEVs and capillary tubes become
clogged.
- Refrigerant gas leaks / shortages.
- Refrigerant oil degradation.
- Poor insulation of the compressor.
- System does not operate properly.
Solutions
- Remove moisture from the piping.
- Piping ends should remain capped until
connections are complete.
- Do not install piping on a rainy day.
- Connect piping properly at the unit’s side.
- Remove caps only after the piping is
cut, the burrs are removed, and after
passing the piping through the walls.
- Evacuate system to a minimum of 500
microns and ensure the vacuum holds at
that level for 24 hours
- Remove dust from the piping.
- Piping ends should remain capped until
connections are complete.
- Connect piping properly at the side of
the unit.
- Remove caps only after the piping is cut
and burrs are removed.
- Retain the cap on the piping when
passing it through walls, etc.
- Test system for air tightness.
- Perform brazing procedures that comply
with all applicable standards.
- Perform flaring procedures that comply
with all applicable standards.
- Perform flanging procedures that
comply with all applicable standards.
- Ensure that refrigerant lines are pressure
tested to 550 psig.
Moisture
Dust
Leaks
Figure 34: Keep Piping Capped While Storing
Table 18: Three Principles of Refrigerant Piping
Piping Materials and Handling
GENERAL INSTALLATION GUIDELINES
Piping Materials and Handling
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