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Refrigerant Piping Work
14.1 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.
Model
RPK-(0.4-1.5)FSR(H)M
RPK-2.0FSRM
RPK-(2.5-4.0)FSRM
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N O T E
In the case of installing the wall type without expansion valve, the size
of the pipe between the indoor unit and the expansion valve differs
depending on the connected outdoor unit. Refer to "installation &
maintenance manual" of expansion valve kit for details.
When installing pipe through the wall,
secure a cap at the end of the pipe.
Correct
Hole
Hole
Attach a cap or
vinyl tape
14.2 PIPING CONNECTION
!
C A U T I O N
Avoid attaching the refrigerant or the refrigerant oil to the upper part of
indoor unit. Otherwise, it will be damaged the indoor unit cover and it
may cause falling of indoor unit. If the refrigerant or the refrigerant oil is
attached, wipe it off completely.
1 Perform the flaring work as shown below.
A
0.4 ~ 0.8 R
d
2 Use specific flare nut.
3 Check that there are no scratch, swarf, deformation, gap,
etc. at the flaring part.
4 Apply the refrigerant oil in a thin layer to the inside of the
16
PMML0552 rev.1 - 02/2021 - A10635790A
Unit: mm
Gas piping
Liquid piping
Ø12.7 (1/2)
Ø6.35 (1/4)
Ø15.88 (5/8)
Ø9.52 (3/8)
Do not place the pipe directly on
the ground.
Correct
Incorrect
mm (in.)
+0
Diameter (Ød)
A
-0.4
6.35 (1/4)
9.1
9.52 (3/8)
13.2
12.7 (1/2)
16.6
15.88 (5/8)
19.7
3 Prepare field-supplied copper pipes.
4 Select clean copper pipes. Make sure there is no dust and
moisture inside.
5 The refrigerant oil 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.
Incorrect
Attach a cap or
vinyl tape
flaring part of the pipe before tightening the flare nut. And the
flare nut must be tightened using two spanners according
to the tightening torque as shown in the figure below. The
tightening work will be easier if tightening the flare pipe in
order of the liquid pipe, the gas pipe. Check the leakage of
the refrigerant after the tightening work.
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N O T E
Refrigerant oil according to the outdoor unit specification.
Apply refrigerant oil
Do not apply the
refrigerant oil to
the outside of
the flaring part
Correct
Incorrect
Rain water can
enter
Attach a cap or vinyl
bag with rubber band
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