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Maximum Pipe Length And Maximum Number Of
Bends
If the pipe length is too long, both the capacity and the
reliability of the unit will decrease. As the number of bends
increases, resistance of the piping system to the refrigerant flow
increases and thus lowering the capacity, as a result the
compressor may become defective. See Figure O and
Figure P.
Figure O
Outdoor Unit
Piping Works
•
Do not use contaminated or damaged copper tubing. Do not remove plastic, rubber plugs and brass nuts from the valves,
fittings, tubings and coils until you are ready to connect suction or liquid line into valves or fittings.
•
If any brazing work is required, ensure that the nitrogen gas
is passed through coil and joints while the brazing work is
being done. This will eliminate soot formation on the inside
walls of the copper tubings.
•
Cut the connection pipe with a pipe cutter.
•
Remove burrs from cut edges of the pipes with remover.
Hold the end of the pipe downwards to prevent metal chips
from entering the pipe.
•
Insert the flare nuts, mounted on the connection parts of both
the indoor unit and outdoor unit onto the copper pipes.
•
Flare the pipe with extra length above the flaring tool as
shown in the table.
•
The flared edge must be even and not cracked or scratched.
Piping Connection To The Units
•
Align the center of the piping and tighten the flare nut
sufficiently with fingers.
•
Finally, tighten the flare nut with the torque wrench
until the wrench clicks.
Pipe Size (mm/in)
6.35 (1/4)
9.53 (3/8)
12.7 (1/2)
15.88 (5/8)
19.05 (3/4)
Flare Joint
Indoor Piping
Spanar
All manuals and user guides at all-guides.com
REFRIGERANT PIPING
Indoor Unit
Torque (Nm)
18
42
55
65
78
Flared Tube
Flare Nut
Torque Wrench
Therefore, always select the shortest path for the piping system
and follow the recommendations as tabulated in the table.
Model
Maximum Length m
Maximum Elevation m
Maximum Number of Bends
Outdoor Unit
Figure P
Cutting Copper Tube
1/4t
Remove Burr
Copper Tube
Swaging Block
Ø Tube, D
Inch
mm
1/4"
6.35
3/8"
9.52
1/2"
12.70
5/8"
15.88
3/4"
19.05
1-10
5CE/
5CE/
5CE/
5CE/
CE15E CE20E CE25E CE28E
/ER
/ER
/ER
/ER
15
15
15
15
8
8
8
8
10
10
10
10
Indoor Unit
A (mm)
Imperial
Rigid
1.3
0.7
1.6
1.0
1.9
1.3
2.2
1.7
2.5
2.0
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