Johnson Controls YVAHR072B32S, Руководство по установке и обслуживанию

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P5417009-rev.6
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Cautions for Refrigerant Pipe Ends
6.1 Piping Materials
(1) Obtain locally-supplied copper pipes.
(2) Use copper pipe for refrigerant piping.
(3) Pay close attention to pipe thickness.
(4) Use clean copper pipes. Make sure there is no dust or moisture inside the pipes.
Do not use any tools which produce a lot of metal shavings such as a saw or a grinder.
(5) Take special care to prevent contamination or moisture settling on interior pipe surfaces during piping
work.
(6) Avoid performing the piping connection work for outdoor unit in the rain.
Brazing Work
(1) Brazing work must be performed by an authorized installer in order to prevent any problems.
(2) For pipe connections, complete non-oxidation brazing with a nitrogen purge. If brazing the pipes
without the nitrogen, a large amount of oxidized scaling is generated in the piping. This oxidized
scaling can cause clogging inside the expansion valve, solenoid valve, accumulator, and compressor,
which can prevent the unit from operating properly.
Do not use the field-supplied antioxidant which can corrode pipes and degrade the refrigerant oil.
NOTICE:
To avoid oxidation and scaling, perform brazing at the appropriate temperature.
● Make sure to use nitrogen. Nitrogen gas pressure shall be 2.9 psi (0.02 MPa) or less.
● Make sure to use the pressure-reducing valve.
● Do not use field-supplied antioxidant.
When installing pipe through
the wall, secure a cap at the
end of the pipe.
Correct
Correct Incorrect Incorrect
Correct Incorrect
Hole Hole
Attach a cap
or vinyl tape.
Attach a cap
or vinyl tape.
Attach a cap
or vinyl bag with
rubber band.
Do not place the pipe
directly on the ground.
Rain water
can enter.
Nitrogen
Gas
Pressure Reducing Valve
(Stop Valve)
Nitrogen Gas Pressure
< 2.9 psi (0.02 MPa)
Brazing Part
NOTE:
Do not cover the outlet. If the inner
pressure exceeds atmospheric pressure,
a pinhole will result and refrigerant gas
will leak from the brazed fitting.
Cover the gap with
tape or a rubber plug
to prevent air from entering
the pipe interior.
Valve Pipe
(1/4 inch)
Nitrogen Gas
Piping Connection on-site