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6. Electrical work
B
L N
S1
S2
S3
D
D
B
E
A
B
C
Fig. 6-2
D
E
6.3. Field electrical wiring (Power wiring specifications)
Models (Outdoor unit)
Indoor unit power supply
Outdoor unit
Phase
Power supply
Frequency & Voltage
Input capacity
Indoor unit (A)
Main switch/Fuse
Outdoor unit (A)
Outdoor unit
Wire No.
Power supply
Indoor unit/Outdoor unit connecting
Wire No. × size (mm
2
)
Remote controller-Indoor unit
Wire No. × size (mm
2
)
Control circuit rating
Notes:
1. Wiring size must comply with the applicable local and national code.
2. Be careful about choosing the installation location for the earth leakage breaker and how it is installed as the initial electric current may cause it to malfunction.
3. Power supply cords and Indoor unit/Outdoor unit connecting cords shall not be lighter than polychloroprene sheathed flexible cord. (design 245 IEC 57)
7. Test run
7.1. Before test run
s After completing installation and the wiring and piping of the indoor and outdoor
units, check for refrigerant leakage, looseness in the power supply or control
wiring, wrong polarity, and no disconnection of one phase in the supply.
s Use a 500-volt megohmmeter to check that the resistance between the power
supply terminals and ground is at least 1.0MΩ Ω Ω Ω Ω .
s Do not carry out this test on the control wiring (low voltage circuit) termi-
nals.
Warning:
Do not use the air conditioner if the insulation resistance is less than 1.0MΩ Ω Ω Ω Ω .
Insulation resistance
After installation or after the power source to the unit has been cut for an extended
period, the insulation resistance will drop below 1 MΩ due to refrigerant accumulat-
ing in the compressor. This is not a malfunction. Perform the following procedures.
1. Remove the wires from the compressor and measure the insulation resistance of
the compressor.
2. If the insulation resistance is below 1 MΩ, the compressor is faulty or the resist-
ance dropped due the accumulation of refrigerant in the compressor.
3. After connecting the wires to the compressor, the compressor will start to warm
up after power is supplied. After supplying power for the times indicated below,
measure the insulation resistance again.
• The insulation resistance drops due to accumulation of refrigerant in the com-
pressor. The resistance will rise above 1 MΩ after the compressor is warmed
up for two to three hours.
(The time necessary to warm up the compressor varies according to atmos-
pheric conditions and refrigerant accumulation.)
8
A
S1
S2
S3
C
A
A
C
Fig. 6-1
RP3V
32/32
Indoor unit-Outdoor unit: S1-S2 AC 220V-230V-240V, S2-S3 DC24V, Remote controller-Indoor unit: DC 14V
6.1. Precautions (Fig. 6-1)
• The compressor will not operate unless the power supply phase connection is cor-
rect.
• Grounding protection with a no-fuse breaker (earth leakage breaker [ELB]) is usu-
ally installed for D.
• The connection wiring between the outdoor and indoor units can be extended up to
a maximum of 50 meters, and the total extension including the crossover wiring
between rooms is a maximum of 80 m.
A switch with at least 3 mm contact separation in each pole shall be provided by the
air conditioner installation.
∗ Label each breaker according to purpose (heater, unit etc.).
A Indoor unit
B Outdoor unit
C Remote controller
A
D Main switch/fuse
E Grounding
6.2. Outdoor unit wiring (Fig. 6-2)
1. Remove the service panel.
2. Wire the cables referring to the figure.
A Earth terminal
B Terminal block (Left: Power supply, Right: Indoor/Outdoor unit connecting wire)
C Fasten with wiring clamp
D Extraction direction for service panel
E Service panel
~/N (single), 50Hz, 220 - 230 - 240V/60Hz, 220V
~/N (Single)
50 Hz, 220 - 230 - 240V/60Hz, 220V
–
3
3 × 2.5 Cable (polar)
Cable 2C × 0.69
* This wire is accessory of remote controller (Wire length: 10 m, Non-polar)
• To operate the compressor with refrigerant accumulated in the compressor,
the compressor must be warmed up at least 12 hours to prevent breakdown.
4. If the insulation resistance rises above 1 MΩ, the compressor is not faulty.
Caution:
• The compressor will not operate unless the power supply phase connection
is correct.
• Turn on the power at least 12 hours before starting operation.
- Starting operation immediately after turning on the main power switch can result in
severe damage to internal parts. Keep the power switch turned on during the op-
erational season.
s The followings must be checked as well.
• The outdoor unit is not faulty. LED1 and LED2 on the control board of the outdoor
unit flash when the outdoor unit is faulty.
• Both the gas and liquid stop valves are completely open.
• A protective sheet covers the surface of the DIP switch panel on the control board of
the outdoor unit. Remove the protective sheet to operate the DIP switches easily.
• Make sure that the all of the SW5 DIP switches for function changes on the control
board of the outdoor unit are set to OFF. If all of the SW5 switches are not set to
OFF, record the settings and then set all of the switches to OFF. Begin recovering
the refrigerant. After moving the unit to a new location and completing the test run,
set the SW5 switches to the previously recorded settings.
RP4, 5, 6 V
–
63/63
3
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