– 64 –
10-5-2. Refrigerant piping
How to remove the service valve cover
Remove the three screws.
Pull the service valve cover in the direction of the
arrow, and remove it.
Screw
Service valve cover
Fig. 10-5-6
Refrigerant piping connection
Flaring
1. Cut the pipe with a pipe cutter.
2. Deburr the inside of the pipe at its end.
Take steps to ensure that the removed burrs will
not enter the pipe.
3. Remove the fl are nuts provided with the indoor
and outdoor units, and insert them into the pipe.
4. Flare the pipe.
The projection margin of the pipe must be
checked.
5. Check that the fl are has the appropriate shape.
Obliquity Roughness Warp
Fig. 10-5-7
Die
Pipe
Fig. 10-5-8
•
Pipe A B Flare Nut
Outside
diameter
Thickness
Rigid
(clutch
type)
R410A
tool
Imperial
(wing nut
type)
R410A
tool
C Tighten torque
mm mm mm mm mm mm N•m kgf•m
6.35 0.8 0 to 0.5 1.5 to 2.0 9.1 17 14 to 18 1.4 to 1.8
9.52 0.8 0 to 0.5 1.5 to 2.0 13.2 22 33 to 42 3.3 to 4.2
12.7 0.8 0 to 0.5 2.0 to 2.5 16.6 26 50 to 62 5.0 to 6.2
Pipe connection
1. Ensure that the same wires and pipes are used
for connecting all the indoor and outdoor units.
2. Align the centers of the connecting pipes and
tighten the fl are nut as much as possible with
your fi ngers. Then tighten the nut with a wrench
and torque wrench as shown in the table above.
If the indoor units have different capacities,
connect them in the sequence of A and B
starting with the unit which has the highest
capacity.
Do not remove the fl are nuts in any of the
rooms where an indoor unit is not going to be
connected.
Do not leave the pipes with their fl are nuts
removed standing for a prolonged period of
time.
When connecting a capacity class 16 pipe to
the indoor unit, attach the expander which is
available as an optional accessory to the 9.52
mm diameter service valve of the outdoor unit.
When attaching the expander to the outdoor
unit, be sure to fi x the service valve with a
wrench.
•
•
•
•
•
To Next Page
Loading...