Hitachi RPC-3.0FSN3 - 5 Refrigerant Piping Work; Piping Materials

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5. Refrigerant Piping Work
(3) Prepare eld-supplied copper pipes.
(4) Select clean copper pipes. Make sure there is no dust and moisture inside.
(5) As the new refrigerant (R410A) is adopted, the refrigerant oil has been also changed, which tends
to be affected by foreign matters such as moisture, oxide lm, fat. Perform the installation work with
care not to enter moisture, dust or old refrigerant into the refrigerant cycle, otherwise the parts such as
expansion valve bite foreign matter and the operation may be unavailable.
(6) Use a pipe cutter to avoid a grind swarf generation for the pipe cutting work. (Do not use a saw or a
grind stone to cut pipes.) Blow the inside of the pipes with nitrogen or dry air, to remove any dust or
foreign materials before connecting pipes.
Use the specied non-ammable refrigerant (R410A) to the outdoor unit in the refrigerant cycle. Do
not charge material other than R410A into the unit such as hydrocarbon refrigerants (propane, etc.),
oxygen, ammable gases (acetylene, etc.) or poisonous gases when installing, maintaining and
moving. These ammables are extremely dangerous and may cause an explosion, a re, and injury.
5.1 Piping Materials
(1) The tolerance of refrigerant piping length differs depending on the combination with the outdoor unit.
The details shall be referred to “Installation & Maintenance Manual” of the outdoor unit.
(2) Select the piping size from the following table.
mm (in.)
Model Gas Piping Liquid Piping
RPC-1.5FSN3
f
12.7 (1/2)
f
6.35 (1/4)
RPC-2.0FSN3
f
15.88 (5/8)
f
6.35 (1/4)
RPC-2.5FSN3
RPC-3.0FSN3
RPC-4.0FSN3
RPC-5.0FSN3
RPC-6.0FSN3
f
15.88 (5/8)
f
9.52 (3/8)
For the refrigerant piping work, vacuum pump and refrigerant charge, the details shall be referred to
“Installation & Maintenance Manual” of the outdoor unit.
When installing pipe through
the wall, secure a cap at the
end of the pipe.
Correct
CorrectIncorrect Incorrect
Correct Incorrect
HoleHole
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.