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Step 5 Connecting the refrigerant pipe
Connect indoor and outdoor units with field-supplied
copper pipes by means of flare connections. Use insulated
seamless refrigeration grade pipe only, (Cu DHP type
according to ISO1337), degreased and deoxidized, suitable
for operating pressures of at least 4200 kPa and for burst
pressure of at least 20700 kPa. Under no circumstances
must sanitary type copper pipe be used.
There are 2 refrigerant pipes of different diameters:
• The smaller one is for the liquid refrigerant
• The larger one is for the gas refrigerant
A short pipe is already fitted to the air conditioner. You
may need to extend the pipe using the assembly pipe.
(optional)
The connection procedure for the refrigerant pipe varies
according to the exit position of the pipe when facing the
wall:
• Right (A)
• Left (B)
• Underside (C)
• Rear
Left(A)
1
Cut out the appropriate knock-out piece on the rear of
the indoor unit unless you connect the pipe directly
from the rear.
2
Smooth the cut edges.
3
Remove the protection caps of the pipes and connect
the assembly pipe to each pipe. Tighten the nuts first
with your hands, and then with a torque wrench,
applying the following torque:
• If you want to shorten or extend pipes, refer to Step 6
4
5
Right(B)
Underside(C)
6
7
• The pipe will be insulated and fixed permanently into
• DO NOT WALL UP THE PIPE CONNECTION!
Refrigerant oil
Torque
wrench
Flare nut
Outer diameter (mm)
Torque (N•m)
6.35
14~18
9.52
34~42
12.70
49~61
15.88
68~82
NOTE
Cutting or flaring the pipes.
Cut off the remaining foam insulation.
If necessary, bend the pipe to fit along the bottom
of the indoor unit. Then pull it out through the
appropriate hole.
• The pipe should not project from the rear of the
indoor unit.
• The bending radius should be 100 mm or more.
Pass the pipe through the hole in the wall.
For further details on how to connect to the outdoor
unit and purge the air, refer to Step 4 Purging the unit.
NOTE
position after finishing the installation and the gas leak
test; refer to page 9 for further details.
All refrigerant pipe connection must be easy accessible
and serviceable.
Spanner
Union
Torque (kgf•cm)
140~180
350~430
500~620
690~830
English
7
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