6
4. Installing the refrigerant piping
4.1. Precautions
For devices that use R32 refrigerant
• Use C1220 copper phosphorus for copper and copper alloy seamless pipes,
to connect the refrigerant pipes. Use refrigerant pipes with the thicknesses
specified in the table below. Make sure the insides of the pipes are clean
and do not contain any harmful contaminants such as sulfuric compounds,
oxidants, debris, or dust.
Warning:
When installing or relocating, or servicing the air conditioner, use only the
specified refrigerant (R32) to charge the refrigerant lines. Do not mix it with any
other refrigerant and do not allow air to remain in the lines.
If air is mixed with the refrigerant, then it can be the cause of abnormal high
pressure in the refrigerant line, and may result in an explosion and other hazards.
The use of any refrigerant other than that specified for the system will cause
mechanical failure or system malfunction or unit breakdown. In the worst case,
this could lead to a serious impediment to securing product safety.
PCY-M13, 18KAL
PCY-M24, 30, 36, 42, 48KAL
Liquid pipe
ø6.35 thickness 0.8 mm
ø9.52 thickness 0.8 mm
Gas pipe
ø12.7 thickness 0.8 mm
ø15.88 thickness 1.0 mm
• Do not use pipes thinner than those specified above.
4.2. Connecting pipes (Fig. 4-1)
• When commercially available copper pipes are used, wrap liquid and gas pipes
with commercially available insulation materials (heat-resistant to 100 °C or more,
thickness of 15 mm or more).
• The indoor parts of the drain pipe should be wrapped with polyethylene foam insula-
tion materials (specific gravity of 0.03, thickness of 9 mm or more).
• For connection, first align the center, then tighten the first 3 to 4 turns of flare nut
by hand and use two wrenches to tighten piping connections
B
.
• Use refrigerant piping insulation provided to insulate indoor unit connections. Insulate
carefully.
B
Flare nut tightening torque
Copper pipe O.D.
(mm)
Flare nut O.D.
(mm)
Tightening torque
(N.m)
ø6.35
17
14-18
ø6.35
22
34-42
ø9.52
22
34-42
ø12.7
26
49-61
ø12.7
29
68-82
ø15.88
29
68-82
ø15.88
36
100-120
ø19.05
36
100-120
C
Use correct flare nuts meeting the pipe size of the outdoor unit.
Available pipe size
PCY-M13, 18KAL
PCY-M24, 30, 36, 42, 48KAL
Liquid side
ø6.35 O
-
-
ø9.52 O
Gas side
ø12.7 O
ø15.88 O
O:
Factory flare nut attachment to the heat exchanger.
Union joint
Internal thread side
External thread side
Flare nut
Tighten the flare nut
with a torque wrench.
Grip the nut on the
union joint with a spanner.
A
Flare cutting dimensions
Copper pipe O.D.
Flare dimensions
(mm)
øA dimensions (mm)
ø6.35
8.7 - 9.1
ø9.52
12.8 - 13.2
ø12.7
16.2 - 16.6
ø15.88
19.3 - 19.7
ø19.05
23.6 - 24.0
Fig. 4-1
E
Die
F
Copper pipe
Fig. 4-2
Copper pipe O.D.
B (mm)
(mm)
Flare tool for R32
Clutch type
ø6.35 (1/4")
0 - 0.5
ø9.52 (3/8")
0 - 0.5
ø12.7 (1/2")
0 - 0.5
ø15.88 (5/8")
0 - 0.5
ø19.05 (3/4")
0 - 0.5
90
0.5
A
R0.4-R0.8
45 2
A
B
C
B
E
F
Warning:
When installing the unit, securely connect the refrigerant pipes before starting
the compressor.
4.3. Indoor unit (Fig. 4-3)
Installing procedures
1. Slide the supplied pipe cover
2
over the gas tubing until it is pressed against the
sheet metal inside the unit.
2. Slide the provided pipe cover
3
over the liquid tubing until it is pressed against
the sheet metal inside the unit.
3. Tighten the pipe covers
2
and
3
at the both ends (20 mm) with the supplied
bands
4
.
A
Gas tubing
E
Pipe cover
3
B
Liquid tubing
F
Press the pipe cover against the sheet metal.
C
Band
4
G
Refrigerant tubing heat insulating material
D
Pipe cover
2
G
C
D
E
F
C
B
A
DE
Fig. 4-3
