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Fig. 21-3
Screw with special
washer
Round terminal
Terminal
board
Wire
For strand wiring
(1) Cut the wire end with a wire cutter or wire-cutting
pliers, then strip the insulation to about 3/8" (10 mm)
to expose the strand wiring. (Fig. 21-2)
(2) Using a screwdriver, remove the terminal screw(s)
on the terminal board.
(3) Using a round terminal fastener or pliers, securely
clamp a round terminal to each stripped wire end.
(Fig. 21-2)
(4) Position the round terminal wire, and replace and
tighten the terminal screw using a screwdriver.
(Fig. 21-3)
13.ELECTRICAL WORK (POWER SUPPLY)
As shown in the figure below, an exclusive power
supply circuit must be provided.
Fig. 22
If this is used in common with
other electrical appliances, the
circuit breaker may trip. An
exclusive circuit must be
provided.
Note :
Connecting another extension cord may
cause trouble because the power cord or the
connection cord between the indoor unit and
outdoor unit is too short. Never connect the
additional cord to extend the power cord or
the connection cord.
14.PIPING
(1) Flaring of Pipe
The following figure shows the optimum pipe flare
position.
Fig. 23
Flaring die
a/2
a
Copper
pipe
Flare shall be as shown at the right.
Screw with
special
washer
Round
terminal
Wire
Exclusive circuit for
air conditioning unit
Circuit
Electric refrigerator,
breaker
microwave oven, etc.
Notch must not exist
on the top edge.
Even luster inside the
flare pipe can be
observed and there
shall not be scratches.
Circumference shall
be even length.
∗ Poor Flaring
The figures shown below cause gas leakage.
Fig. 24
Offset
Internal
scratches
(2) Flare Nut Tightening
q As shown in Fig.25, adjust the pipe so that the
center line of the pipe matches that of the valve,
and then tighten the flare nut by hand.(Initially
tightening the nut with a wrench will damage the
thread and cause gas leakage.)
Fig. 25
Flare nut
Pipe flared
w To tighten the flare nut, use a torque wrench.
e If excessive force is used to tighten the flare nut,
the flare part will be extended as shown in Fig.26
and cause gas leakage.
Fig. 26
r Tightening the flare nut at the indoor unit side
should be done with 2 wrenches as shown in
Fig.27.
Fig. 27
Wrench
(3) When installing, observe the following precautions :
A. Drying :
Never allow water and air to enter the unit.
q Do not install piping on a rainy day.
w To store copper pipe, cap the pipe.
e Always perform air purge.
Fig. 28
– 24 –
Measurement
Measurement
shortened
enlarged
Crack
Notched
Valve thread
Center line
Valve unit
Flare extended
Torque
wrench
Bad
angle
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