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10.1.4 Connect the Piping
10.1.4.1 Connecting The Piping To
Indoor Unit
Please make flare after inserting flare nut (locate at
joint portion of tube assembly) onto the copper
pipe.
(In case of using long piping)
Connect the piping
Align the center of piping and sufficiently tighten
the flare nut with fingers.
Further tighten the flare nut with torque wrench in
specified torque as stated in the table.
10.1.4.2 Connecting The Piping To
Outdoor Multi
Decide piping length and then cut by using pipe
cutter.
Remove burrs from cut edge.
Make flare after inserting the flare nut (locate at
valve) onto the copper pipe. Align center of piping
to valves and then tighten with torque wrench to
the specified torque as stated in the table.
Do not over tighten, over tightening may cause gas leakage.
Piping size
Torque
6.35 mm (1/4")
[18 N•m (1.8 kgf•m)]
9.52 mm (3/8")
[42 N•m (4.3 kgf•m)]
12.7 mm (1/2")
[55 N•m (5.6 kgf•m)]
15.88 mm (5/8")
[65 N•m (6.6 kgf•m)]
19.05 mm (3/4")
[100 N•m (10.2 kgf•m)]
10.1.5 Evacuation of the Equipment
WHEN INSTALLING AN AIR CONDITIONER, BE SURE TO EVACUATE THE AIR INSIDE THE INDOOR UNIT AND
PIPES in the following procedure.
1. Connect a charging hose with a push pin to the Low and High side of a charging set and the service port of
the 3-way valve.
o
Be sure to connect the end of the charging hose with the push pin to the service port.
2. Connect the center hose of the charging set to a vacuum pump with check valve, or vacuum pump adaptor.
3. Turn on the power switch of the vacuum pump and make sure that the needle in the gauge moves from
0 cmHg (0 MPa) to -76 cmHg (-0.1 MPa). Then evacuate the air approximately 10 minutes.
4. Close the Low and High side valves of the charging set and turn off the vacuum pump. Make sure that the
needle in the gauge does not move after approximately 5 minutes.
Note: BE SURE TO FOLLOW THIS PROCEDURE IN ORDER TO AVOID REFRIGERANT GAS LEAKAGE.
5. Disconnect the charging hose from the vacuum pump and from the service port of the 3-way valve.
6. Tighten the service port caps of the 3-way valve at a torque of 18 N•m with a torque wrench.
7. Remove the valve caps of the both 3-way valves. Position both of the valves to “OPEN” using a hexagonal
wrench (4 mm).
8. Mount valve caps onto the both 3-way valves.
o
Be sure to check for gas leakage.
Spanner
or Wrench
Torque
wrench
Indoor Unit
Outdoor Unit
3-way valve
3-way valve
Close
Close
3-way valve
3-way valve
Indoor Unit
Vacuum
pump
Vacuum pump
adaptor
Gas side
Gas side
Liquid side
Liquid side
OPEN
CLOSE
