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4. Drain piping for outdoor unit (Fig. 4-1)
Drain socket
Fig. 4-1
5. Refrigerant piping work
A
(B)
(C)
Fig. 5-1
A
ø9.52
ø12.7
ø15.88
Fig. 5-2
Drain hose
(A)
Indoor unit
A
Outdoor unit
B
B
Indoor unit
A
Outdoor unit
B
ø6.35
ø9.52
B
4.1. Accessories
Check the following parts before installation.
<Outdoor unit>
1
Drain socket
• Provide drain piping before indoor and outdoor piping connection. (It will be hard
to install drain socket
if indoor and outdoor piping connection is conducted prior
1
to drain piping as outdoor unit becomes immovable.)
• Connect the drain hose
(obtainable at a store, inside diameter: 15 mm) as
shown in the figure for drainage.
• Make sure to provide drain piping with a downhill grade for easy drain flow.
Note:
Do not use the drain socket
in the cold region. Drain may freeze and it
1
makes the fan stop.
5.1. Refrigerant pipe (Fig. 5-1)
► Check that the difference between the heights of the indoor and outdoor
units, the length of refrigerant pipe, and the number of bends in the pipe are
within the limits shown below.
(A) Pipe length
Models
(one way)
M25/M35
Max. 20 m
M50/M60/M71
Max. 30 m
• Height difference limitations are binding regardless of which unit, indoor or out-
door, is positioned higher.
• Refrigerant adjustment ... If pipe length exceeds 7 m, additional refrigerant (R32)
charge is required.
(The outdoor unit is charged with refrigerant for pipe length up to 7 m.)
Up to 7 m
No additional charge is required.
Pipe length
Additional charge is required.
Exceeding 7 m
(Refer to the table below.)
M25
20 g × (refrigerant piping length (m) -7)
M35
20 g × (refrigerant piping length (m) -7)
Refrigerant
M50
20 g × (refrigerant piping length (m) -7)
to be added
M60
20 g × (refrigerant piping length (m) -7)
M71
40 g × (refrigerant piping length (m) -7)
(1) Table below shows the specifications of pipes commercially available.
Outside diameter
Model
Pipe
mm
For liquid
6.35
M25
For gas
9.52
For liquid
6.35
M35
For gas
9.52
For liquid
6.35
M50
For gas
12.7
For liquid
6.35
M60
For gas
15.88
For liquid
9.52
M71
For gas
15.88
(2) Ensure that the 2 refrigerant pipes are well insulated to prevent condensation.
(3) Refrigerant pipe bending radius must be 100 mm or more.
Caution:
Using careful insulation of specified thickness. Excessive thickness prevents
storage behind the indoor unit and smaller thickness causes dew drippage.
• Be sure to have appropriate ventilation in order to prevent ignition. Furthermore,
be sure to carry out fire prevention measures that there are no dangerous or flam-
mable objects in the surrounding area.
• R32 maintenance refilling: Before servicing refilling the equipment with R32 to
ensure that there is no risk of explosion from electrical sparks it must be ensured
that the equipment machine is 100% disconnected from the mains supply.
(B) Height
(C) Number of
difference
bends (one way)
Max. 12 m
Max. of 10
Max. 30 m
Max. of 10
Maximum
amount of
refrigerant
Min. wall
Insulation
Insulation
thickness
thickness
material
inch
1/4
0.8 mm
8 mm
3/8
0.8 mm
8 mm
1/4
0.8 mm
8 mm
3/8
0.8 mm
8 mm
Heat resisting
1/4
0.8 mm
8 mm
foam plastic
0.045 specific
1/2
0.8 mm
8 mm
gravity
1/4
0.8 mm
8 mm
5/8
0.8 mm
8 mm
3/8
0.8 mm
8 mm
5/8
1.0 mm
8 mm
1
0.91
1.16
1.66
1.71
2.37
7
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