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S4359128
19
● Conduit's trade size for this unit is 1/2". The
conduit can be purchased at a hardware store.
● The fuse located in the outdoor unit provides
power supply protection and may blow when
power is applied if the system has been
incorrectly wired.
(5) Ground the unit in accordance with local codes.
(6) Be sure to size each wire allowing several inches
longer than the required length for wiring.
(7) Use lock nuts to secure the conduit tubes.
NOTE
● Be sure to comply with
local codes while running
the wire from the indoor
unit to the outdoor unit
(size of wire and wiring
method, etc.).
● Every wire must be
connected firmly.
● No wire should be
allowed to touch
refrigerant tubing, the
compressor or any
moving part.
Fig. 6-2
● To avoid the risk of
electric shock, each air
conditioner unit must be
grounded.
● Be sure to connect the
power supply line to the
outdoor unit as shown in
the wiring diagram. The
indoor unit draws its
power from the outdoor
unit.
CAUTION
6-4. Examples of Incorrect Wiring
The following are examples of improper wiring that result in system misoperation. You should confirm that you
have wired the units correctly before beginning the test run.
Problem 1
● Short circuit will occur after approx.
3 minutes and the power circuit
fuse blows.
Problem 2
● Air conditioner will not operate.
1
2
3
G G
1
2
3
Disconnect
switch
Indoor unit Outdoor unit
Grounding line
(A)
1301_C_I
1
2
3
G G
Disconnect
switch
Indoor unit Outdoor unit
Grounding line
(C)
1
2
3
1303_C_I
1
2
3
G G
2
Disconnect
switch
Indoor unit Outdoor unit
Grounding line
(B)
1
3
1302_C_I
Problem 3
● Compressor will not start; only indoor unit will operate.
Outdoor unit
1304_C_I
1
2
3
G G
2
Disconnect
switch
Indoor unit
Grounding line
(D)
3
1
1305_C_I
Outdoor unit
1
2
3
G G
Disconnect
switch
Indoor unit
Grounding line
(E)
1
2
3
1823_M_I
2
1
3
2
1
3
4
5
6
G
G
(Inter-unit)
Power lines
B
230/208 V
230/208 V
230/208 V
INDOOR
OUTDOOR UNIT
INDOOR UNIT
Disconnect
switch
(Field supply)
Grounding
line
Fuse
L1
L2
Power supply line
Single-phase, 230/208 V
A