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6. Refrigerant pipe and drain pipe specifications
To avoid dew drops, provide sufficient antisweating and insulating work to the
refrigerant and drain pipes.
When using commercially available refrigerant pipes, be sure to wind commer-
cially available insulating material (with a heat-resisting temperature of more than
100 °C [212°F] and thickness given below) onto both liquid and gas pipes.
Be also sure to wind commercially available insulating material (with a form poly-
ethylene's specific gravity of 0.03 and thickness given below) onto all pipes which
pass through rooms.
6.1. Refrigerant pipe and drain pipe specifications
[Fig. 6.1.1] (P. 3)
Flare cutting dimensions
Apply refrigerating machine oil over the entire flare seat surface
Flare cutting dimensions
Copper pipe O.D. (mm) [in]
Refrigerant pipe sizes & Flare nut tightening torque
Liquid pipe
Pipe size
(mm) [in]
φ6.35 [1/4]
P15
O
D
.
.
φ6.35 [1/4]
P18
O
D
.
.
φ9.52 [3/8]
P24
27
30
O.D
·
·
.
φ9.52 [3/8]
P36
48
54
O
D
·
·
.
.
* Use the provided flare nut for the following pipes: Liquid pipe of P18,P36, P48, P54, and gas pipe of P18.
Liquid pipe
φ9.52 [3/8]
P72
O
D
.
.
φ9.52 [3/8]
P96
O
D
.
.
6.2. Refrigerant pipe, drain pipe and filling
port
[Fig. 6.2.1] (P. 3)
Type15 - 54
Type 72 · 96
Air inlet
Refrigerant piping (gas)
Drain outlet
6.3. Request for refrigerant piping connec-
tion
Connecting refrigerant piping
•
After connecting refrigerant piping, insulate the joints (flared joints) with ther-
mal insulation tubing as shown below.
[Fig. 6.3.1] (P. 4)
Type15 - 54
Thermal insulation tubing A
Caution:
Pull out the thermal insulation on the refrigerant piping at the site, insert the
flare nut to flare the end, and replace the insulation in its original position.
Take care to ensure that condensation does not form on exposed copper pip-
ing.
Liquid end of refrigerant piping
Site refrigerant piping
Marked "GAS"
Flared insulation (supplied) B
Thermal insulation
Flare nut
Ensure that there is no gap here
Outside
Remove tape
Thermal insulation tubing (small) (supplied) A
Tie (large) (supplied) D
Ensure that there is no gap here. Place the joint upwards.
Refrigerant pipe sizes & Flare nut tightening torque
φ6.35 [1/4]
φ9.52 [3/8]
φ12.7 [1/2]
φ15.88 [5/8]
φ19.05 [3/4]
R410A
Gas pipe
Tightening
Tightening
Pipe size
torque
torque
(mm) [in]
(N·m)
(N·m)
φ12.7 [1/2]
14 – 18
O
D
49 – 61
.
.
φ12.7 [1/2]
34 – 42
O
D
68 – 82
.
.
φ15.88 [5/8]
34 – 42
O
D
68 – 82
.
.
φ15.88 [5/8]
34 – 42
O
D
100 – 120
.
.
R410A
Gas pipe
φ19.05 [3/4]
O
D
.
.
φ22.2 [7/8]
O
D
.
.
Refrigerant piping (liquid)
Control box
Air outlet
Gas end of refrigerant piping
Main body
Marked "OUTSIDE"
Marked "INSIDE"
Pull
Return to original position
Plate on main body
Inside
A Select the thickness of insulating material by pipe size.
Pipe size
6.4 mm to 25.4 mm [1/4 in to 1 in]
28.6 mm to 38.1 mm [1-1/8 in to 1-1/2 in]
B If the unit is used on the highest story of a building and under conditions of
high temperature and humidity, it is necessary to use pipe size and insulating
material's thickness more than those given in the table above.
C If there are customer's specifications, simply follow them.
Flare dimensions φA dimensions (mm) [in]
8.7 – 9.1 [11/32 – 6/16]
12.8 – 13.2 [17/32 – 17/32]
16.2 – 16.6 [21/32 – 21/32]
19.3 – 19.7 [25/32 – 25/32]
22.9 – 23.3 [29/32 – 30/32]
R22
Liquid pipe
Tightening
Pipe size
Pipe size
torque
(mm) [in]
(mm) [in]
(N·m)
φ6.35 [1/4]
φ12.7 [1/2]
O
D
14 – 18
O
D
.
.
.
.
φ9.52 [3/8]
φ15.88 [5/8]
O
D
34 – 42*
O
D
.
.
.
.
φ9.52 [3/8]
φ15.88 [5/8]
O
D
34 – 42
O
D
.
.
.
.
φ9.52 [3/8]
φ19.05 [3/4]
O
D
34 – 42
O
D
.
.
.
.
Liquid pipe
φ12.7 [1/2]
O
D
.
.
φ12.7 [1/2]
O
D
.
.
[Fig. 6.3.2] (P. 4)
Type 72 · 96
Thermal insulation tubing A
Caution:
Pull out the thermal insulation on the refrigerant piping at the site, braze the
piping, and replace the insulation in its original position.
Take care to ensure that condensation does not form on exposed copper pip-
ing.
Refrigerant piping (liquid)
Main body
Site refrigerant piping
Ensure that there are no gaps between the insulation and the main body.
Thermal insulation tubing (small) (supplied) A
Ties (large) (supplied) D
Ensure that there is no gap here. Place the joint upwards.
Thermal insulation tubing (medium) (supplied) B
Cut
Release gas before removing the brazing.
Thermal insulation
Flared pipe end
Return to original position
Caution:
Before removing the brazing, cut off the end of the pipe to release any gas.
If the gas is not released, the pipe may fly off.
1. Remove and discard the rubber bung which is inserted in the end of the unit
piping.
2. Flare the end of the site refrigerant piping.
3. Pull out the thermal insulation on the site refrigerant piping, braze the unit
piping, and replace the insulation in its original position.
*
Before brazing the refrigerant piping, always wrap the piping on the main
body, and the thermal insulation piping, with damp cloth to prevent heat
shrinkage and burning the thermal insulation tubing. Take care to ensure
that the flame does not come into contact with the main body itself.
Refrigerant amount adjustment
Refer to the installation manual for the outdoor unit for details on adjusting the
amount of refrigerant.
Insulating material's thickness
More than 10 mm [13/32 in]
More than 15 mm [19/32 in]
Flare nut O.D.
Gas pipe
Tightening
Liquid
Gas pipe
torque
pipe
(mm) [in]
(N·m)
(mm) [in]
49 – 61
17 [11/16] 27 [1-3/32]
68 – 82*
22 [7/8]
29 [1-5/32]
68 – 82
22 [7/8]
29 [1-5/32]
100 – 120*
22 [7/8]
36 [1-7/16]
R22
Gas pipe
φ25.4 [1]
O
D
.
.
φ28.58 [1·1/8]
O
D
.
.
Refrigerant piping (gas)
Thermal insulation tubing B
Pull
Wrap with damp cloth
Ensure that there is no gap here.
(mm) [in]
9
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