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Two short refrigerant pipes are already attached to the air
conditioner:
•
The smaller-diameter pipe is for the high-pressure,
two-phase refrigerant.
•
The larger-diameter pipe is for the low-pressure
refrigerant vapor.
Drain hose
Refrigerant
pipes
(assembly pipe)
In Step 4 you determined the exit position for the piping
bundle. The unit has three knockouts available for the left,
right, and bottom exits. When the bundle exits directly from
the rear, none of the knockouts are used.
1
If the pipes will exit directly from the rear, skip to step 3.
Otherwise, cut out the appropriate knockout piece (left,
right, or bottom).
2
Use a razor knife to clean the cut edges (flashing).
3
The left exit is the only position that does not require
bending the pipes. For other positions, bend the pipes so
that they will exit in the selected exit position.
‐
The bending radius should be greater than 100 mm.
‐
Bend the smaller pipe gradually to prevent kinking.
The larger pipe has a preinstalled spring bender to
prevent kinking.
‐
Make sure that the pipes do not protrude from the
back of the unit in a way that will make it difficult to
attach the unit to the mounting bracket.
‐
For right and bottom exits, pull the pipes out through
the selected knockout opening. For left exits, the
piping connections will be made in the service space
behind the indoor unit (under the cover panel).
•
4
Connection hose
5
6
7
•
NOTE
If you are using the right rear exit, the pipes should
be long enough to extend through the wall without
needing to connect the line set first. It may be easier
to connect the line set outside of the building, after
you have bundled the pipes and cables and passed the
bundle through the wall. In this case, do not connect
the line set now. Instead, complete Step 9 through
Step 12, then go outside and connect the line set as
described below.
Slowly remove the protective caps on the refrigerant pipe
connections to relieve the nitrogen holding charge.
Connect the line set to each pipe.
Indoor outlet pipe
Hand-tighten the flare nuts to make sure that they do not
become stripped.
Liquid service port
<High pressure>
Torque the flare connections to the following values:
Outer diameter
Torque
(inch (mm))
(lbf•ft (N•m))
Ø 1/4" (6.35)
10.3 to 13.3 (14 to 18)
Ø 3/8" (9.52)
25.1 to 31.0 (34 to 42)
Ø 1/2" (12.70)
36.1 to 45.0 (49 to 61)
Ø 5/8" (15.88)
50.2 to 60.5 (68 to 82)
CAUTION
Tighten the flare nuts only to the specified torque. If
a flare nut is overtightened, the flare face may crack,
causing refrigerant leakage.
Flare nut
Connecting pipe
Gas service port
<Low pressure>
Torque (kgf•cm)
140~180
350~430
500~620
690~830
English
9
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