5
3.3. Indoor unit (Fig. 3-3)
Heat insulation for refrigerant pipes:
1 Wrap the enclosed large-sized pipe cover around the gas pipe, making sure
that the end of the pipe cover touches the side of the unit.
2 Wrap the enclosed small-sized pipe cover around the liquid pipe, making sure
that the end of the pipe cover touches the side of the unit.
3 Secure both ends of each pipe cover with the enclosed bands. (Attach the
bands 20 mm from the ends of the pipe cover.)
• After connecting the refrigerant piping to the indoor unit, be sure to test the pipe
connections for gas leakage with nitrogen gas. (Check that there is no refrigerant
leakage from the refrigerant piping to the indoor unit.)
Fig. 3-3
3. Refrigerant pipe and drain pipe
3.4. Drainage piping work (Fig. 3-4)
• Use VP25 (O.D. ø32 (1-1/4”) PVC TUBE) for drain piping and provide 1/100 or
more downward slope.
• Be sure to connect the piping joints using a polyvinyl type adhesive.
• Observe the fi gure for piping work.
• Use the included drain hose to change the extraction direction.
1
Correct piping
2
Wrong piping
A
Insulation (9 mm or more)
B
Downward slope (1/100 or more)
C
Support metal
K
Air bleeder
L
Raised
M
Odor trap
Grouped piping
D
O. D. ø32 PVC TUBE
E
Make it as large as possible
F
Indoor unit
G
Make the piping size large for grouped piping.
H
Downward slope (1/100 or more)
I
O. D. ø38 PVC TUBE for grouped piping.
(9 mm or more insulation)
J
Up to 85 cm
1. Connect the drain socket (supplied with the unit) to the drain port. (Fig. 3-5)
(Fix the tube using PVC adhesive then secure it with a band.)
2. Install a locally purchased drain pipe (PVC pipe, O.D. ø32).
(Fix the pipe using PVC adhesive then secure it with a band.)
3. Insulate the tube and pipe. (PVC pipe, O.D. ø32 and socket)
4. Check that drain fl ows smoothly.
5. Insulate the drain port with insulating material, then secure the material with a
band. (Both insulating material and band are supplied with the unit.)
A
Unit
B
Insulating material
C
Band (large)
D
Drain port (transparent)
E
Insertion margin
F
Matching
G
Drain pipe (O.D. ø32 PVC TUBE)
H
Insulating material (purchased locally)
I
Transparent PVC pipe
J
O.D. ø32 PVC TUBE (Slope 1/100 or more)
K
Band (small)
L
Drain socket
11
25
25
25
,
Max. 20m
1.5–2m
Max. 15cm
Fig. 3-4
Fig. 3-5
(mm)
C
Apply refrigerating machine oil over the entire fl are seat surface.
* Do not apply refrigerating machine oil to the screw portions.
(This will make the fl are nuts more apt to loosen.)
D
Be certain to use the fl are nuts that are attached to the main unit.
(Use of commercially-available products may result in cracking.)
Refrigerant pipe and
insulating
material
Pipe cover (large)
Pipe cover (small)
Refrigerant pipe (gas)
Refrigerant pipe (liquid)
Band
Cross-sectional view of
connection
Pipe
Insulating material
Squeeze
B
Refrigerant pipe sizes & Flare nut tightening torque
R407C or R22
R410A
Flare nut O.D.
Liquid pipe
Gas pipe
Liquid pipe
Gas pipe
Pipe size
(mm)
Tightening
torque
(N.m)
Pipe size
(mm)
Tightening
torque
(N.m)
Pipe size
(mm)
Tightening
torque
(N.m)
Pipe size
(mm)
Tightening
torque
(N.m)
Liquid pipe
(mm)
Gas pipe
(mm)
P20/25/32/40
ODø6.35 (1/4”)
14 - 18
ODø12.7 (1/2”)
49 - 61
ODø6.35 (1/4”)
14 - 18
ODø12.7 (1/2”)
49 - 61
17
26
P50
ODø9.52 (3/8”)
14 - 18*
ODø15.88 (5/8”)
49 - 61*
ODø6.35 (1/4”)
14 - 18
ODø12.7 (1/2”)
49 - 61
17
26
P63/80
ODø9.52 (3/8”)
34 - 42
ODø15.88 (5/8”)
68 - 82
ODø9.52 (3/8”)
34 - 42
ODø15.88 (5/8”)
68 - 82
22
29
P100/125
ODø9.52 (3/8”)
34 - 42
ODø19.05 (3/4”)
68 - 82*
ODø9.52 (3/8”)
34 - 42
ODø15.88 (5/8”)
68 - 82
22
29
* Connect the joint with the following pipes: Liquid and gas pipes of P50, gas pipe of P100/P125.
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