6
4. Refrigerant pipe and drain pipe
5. Electrical work
Fig. 4-5
Apply PVC adhesive
(purchased locally) here for bonding
On-site drain pipe (I.D.ø20)
Unit’s drain pipe (drain hose)
Fig. 4-6
Fig. 5-1
Fig. 4-7
O.D.
ø20
Drain socket
Completing the piping (Fig. 4-7)
• To prevent dripping condensation, put felt tape over the insulation materials on
the refrigerant and drain pipes within the unit as shown in the diagram.
• Arrange the drain hose so that it goes to the bottom of the unit. Take care that
the middle of the drain hose is not raised.
Felt tape
Liquid pipe
Gas pipe
Drain pipe
Viewed from the back
Two refrigerant pipes are wrapped together.
A single drain hose is wrapped with felt tape.
Two refrigerant pipes are wrapped with felt tape from the end of the bent section.
Overlapping width of felt tape is one half of the tape width or less.
Secure the end of the felt tape with a bandage fixture.
4.4. Drain piping (Fig. 4-6)
• Drain pipes should have an inclination of 1/100 or more.
• Use PVC pipe VP-20 for drain piping.
• Drain pipes can be cut with a knife at the connection point according to the on-
site conditions.
• When connecting the VP-20, use adhesive to attach the supplied drain socket.
• To prevent dripping condensation, put felt tape over the insulation materials on
the refrigerant and drain pipes within the unit as shown in the diagram.
Caution:
The drain pipe should be installed according to this Installation Manual to
ensure correct drainage. Thermal insulation of the drain pipes is necessary
to prevent condensation. If the drain pipes are not properly installed and in
-
sulated, condensation may drip on the ceiling, floor or other possessions.
Remove the side panel of the indoor unit on the drain side. Pour water in the drain
pan and check that it comes out the drain pipe end. After confirmation, reinstall the
side panel.
2) Specified tightening torques (use a torque wrench) (Fig. 4-5)
Torque specifications
Outer dia. of copper tube (mm)
Tightening torque (N
•
m)
ø9.52
34 - 42
ø15.88
68 - 82
ø19.05
100 - 120
• If a torque wrench is not available, the following method may be used.
While tightening the flare nut with a spanner, stop turning the nut at the point
where the tightening torque suddenly increases. Then, turn the spanner the an-
gle specified in the table below.
Approximate additional tightening angle
Pipe diameter
Tightening angle
ø6.35, ø9.52
60° - 90°
ø15.88, ø19.05
30° - 60°
5.1. Indoor unit
Remove the right side panel. (Fig. 5-1)
To do this, remove the screws on the lower and right sides.
Remove the securing screw on the terminal block cover to take away the cover.
Terminal block cover
Screw
Band
Printed circuit board cover
Right side panel
Coupler connector
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