Main Unit and Piping
Electrical
Test Operation
Reference
27
4. Refrigerant Piping
2) General precautions
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Refrigerant piping installation
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During the installation of the piping, always close off the ends of the piping with tape or caps to prevent moisture,
dust or other impurities from entering.
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Always sufficiently flush the inside of the piping with nitrogen gas to remove foreign object, moisture and other
impurities.
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Always use a pipe cutter to cut the pipes.
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Inside of the cut sections there are burrs. Always remove these burrs before flare processing.
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In order to prevent oxide film from forming inside the piping during brazing, always braze with nitrogen
gas flowing through the piping with a pressure reduction valve. The appropriate nitrogen gas pressure
is 2.90 psig (0.02 MPa). (You feel breeze on your cheek at this pressure.)
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When supplying nitrogen gas through the pip-
ing during brazing, ensure that the end of the
pipe that the nitrogen is flowing into is sealed
to prevent air from entering.
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Route the refrigerant piping so as to provide a
space for servicing.
Warning
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This equipment uses non-flammable refrigerant, R410A exclusively. Never charge with
other refrigerant, air, oxygen, propane, or other materials.
Doing so could cause an explosion or a fire.
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Be sure to remove any flammable materials before brazing.
Failure to do so could cause a fire.
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Be sure to use non-flammable and non-toxic cleaning liquid for washing.
Using a flammable cleaning liquid could cause an explosion or a fire.
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Be sure to provide adequate ventilation when installing the refrigerant piping because
installation in a tightly closed place can cause an accident due to lack of oxygen.
If a cleaning liquid contacts fire, it can create toxic gas.
Caution
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Be sure to collect the cleaning liquid after washing.
Indiscriminate chlorofluorocarbon (CFC) emission into the atmosphere is prohibited by the
law.
Dispose of the refrigerant as required by relevant local and national regulations.
Important reminder
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The R410A specification requires stringent control of impurities, such as moisture and foreign
material. The following precautions must be strictly followed during installation in order to pre-
vent damage to the equipment.
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During brazing, always supply nitrogen gas through the piping. Brazing without supplying nitro-
gen gas can create oxide film and cause equipment breakdown.
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Do not use any antioxidant sold on the market. It may have an adverse effect on the refrigerant
and refrigerant oil, resulting in equipment breakdown.
Cap
Nitrogen
Brazing
Summary of Contents for AWGP180E1NHS
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