15 refriGerant PiPinG WorK
!
d a n G e r
Use the specified non-flammable 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 or etc.),
oxygen, flammable gases (acetylene, etc.) or poisonous gases when
installing, maintaining and moving. These flammables are extremely
dangerous and may cause an explosion, a fire, and injury.
For the refrigerant piping work, vacuum pump and refrigerant
charge, the details shall be referred to Installation and Operation
Manual of the outdoor unit.
15.1 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 and Operation Manual of the outdoor
unit.
2
Select the piping size from the following table.
Unit: mm
model
Gas piping
liquid piping
RPc-1.5fsn3
Ø12.7 (1/2)
Ø6.35 (1/4)
rPC-2.0FSN3
Ø15.88 (5/8)
Ø6.35 (1/4)
rPC-(2.5-6.0)FSN3
Ø15.88 (5/8)
Ø9.52 (3/8)
3
Prepare field-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 film, 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.
correct
correct
incorrect
incorrect
incorrect
correct
Hole
Hole
When installing pipe through the wall,
secure a cap at the end of the pipe.
Do not place the pipe directly on the
ground.
Attach a cap or
vinyl tape.
Attach a cap or
vinyl tape.
rain water
can enter.
Attach a cap or vinyl bag
with rubber band.
rEFrIGErANT PIPING WOrK
PMML0254A rev.4 - 12/2018
28
