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8. Precautions on refrigerant piping
Do not allow anything other than the designated refrigerant to get
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refrigerant gas leaks while working on the unit, ventilate the room
thoroughly right away.
Use R410A only when adding refrigerant.
Installation tools:
Make sure to use installation tools (gauge manifold, charge hose,
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the pressure and to prevent foreign materials (e.g., mineral oils and
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Vacuum pump:
- Use a 2-stage vacuum pump with a non-return valve.
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while the pump is not working.
- Use a vacuum pump which can evacuate to 500 microns.
Protection against contamination when installing pipes
Take measures to prevent foreign materials like moisture and contami-
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Installation
More than a month
Less than a month
Regardless of the period
Block all gaps in the holes for passing out piping and wiring using seal-
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animals may enter the machine).
Example: passing piping out through the front.
1
Close the areas marked with
(When the piping is routed from the
1
front panel.)
Use clean pipes only.
Hold the pipe end downwards when removing burrs.
Cover the pipe end when inserting it through a wall so that no dust
or dirt enters the pipe.
NOTE
After all the piping has been connected, make sure there is no gas
leak. Use Dry Nitrogen to perform a gas leak detection.
After knocking out the holes, we recommend you remove burrs in
the knock holes and paint the edges and areas around the edges
using the repair paint.
8.1. Caution for brazing
Make sure to blow through with Dry Nitrogen when brazing. Blowing
through with Dry Nitrogen prevents the creation of large quantities
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versely affects valves and compressors in the refrigerating system
and prevents proper operation.
The Dry Nitrogen pressure should be set to 2.9 psi (0.02 MPa (i.e.,
just enough so it can be felt on the skin)) with a pressure-reducing
valve.
3P362438-5N English
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Protection method
Pinch the pipe
Pinch or tape pipe
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1 Refrigerant piping
2 Part to be brazed
3 Taping
4 Hands valve
5 Pressure-reducing valve
6 Dry Nitrogen
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clog pipes and break equipment:
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deteriorate the refrigerant oil.
8.2. Connecting the refrigerant piping
8.2.1. Decide front or side (bottom) connection
Installation of refrigerant piping is possible as front connection or side con-
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For side connections, the knockout hole on the bottom plate should
be removed:
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NOTE
Precautions when knocking out knockout holes:
Be sure to avoid damaging the casing.
After knocking out the knockout holes, we recommend you remove
the burrs and paint the edges and areas around the edges using
repair paint to prevent rusting.
When passing electrical wiring through the knock holes, protect the wir-
ing with a conduit or bushings, making sure not to damage the wiring.
8.2.2. Remove the pinched pipes
WARNING
Any gas or oil remaining inside the stop valve may blow off the pinched
piping.
Failure to observe the instructions in procedure below properly may
result in property damage or personal injury, which may be serious
depending on the circumstances.
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Left-side connection
2
Front connection
3
Right-side connection
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Knockout hole (Piping)
2
Drill
3
Points for drilling
4
Knockout hole (Power supply
wiring)
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