S1
S2
S3
S1
S2
S3
8
6. Electrical work
Warning:
In case of A-control wiring, there is high voltage potential on the S3 terminal caused by electrical circuit design that has no electrical insulation between power
line and communication signal line. Therefore, please turn off the main power supply when servicing. And do not touch the S1, S2, S3 terminals when the power
is energized. If isolator should be used between indoor unit and outdoor unit, please use 3-pole type.
A-Control
Outdoor Unit
3 pole isolator
Power supply
Isolator
A-Control
Indoor Unit
7. Test run
7.1. Before test run
After completing installation and the wiring and piping of the indoor and
outdoor units, check for refrigerant leakage, looseness in the power sup-
ply or control wiring, wrong polarity, and no disconnection of one phase in
the supply.
Use a 500-volt megohmmeter to check that the resistance between the
power supply terminals and ground is at least 1.0M
"
.
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 1.0M
"
.
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 M
"
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 M
"
, the compressor is faulty or the resis-
tance 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 M
"
after the compressor is warmed
up for 4 hours.
(The time necessary to warm up the compressor varies according to atmo-
spheric conditions and refrigerant accumulation.)
• 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 M
"
, the compressor is not faulty.
Caution:
• The compressor will not operate unless the power supply phase connec
-
tion 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
operational season.
The followings must be checked as well.
• The outdoor unit is not faulty. LED1 and LED2 on the control board of the out
-
door 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 con
-
trol 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 re-
covering the refrigerant. After moving the unit to a new location and completing
the test run, set the SW5 switches to the previously recorded settings.
Note:
A low knocking sound might be heard from the Fan Section of this unit dur-
ing the test run. This is caused by the torque fluctuating to control the Fan
revolutions. This is not a defect in the unit.
6.2. Field electrical wiring
Outdoor unit model
P71V
P100V
P71Y
P100Y
P125Y
P140Y
Outdoor unit power supply
~/N (single), 50 Hz, 230 V
3N~ (3 phase), 50 Hz, 400 V
Outdoor unit input capacity Main switch (Breaker)
*1
32 A
16 A
25 A
Max. Permissive System Impedance ( )
0.06
0.23
0.22
0.14
0.12
Wiring
Wire No. ×
size (mm
2
)
Outdoor unit power supply
2 × Min. 4
4 × Min. 1.5
4 × Min. 2.5
Outdoor unit power supply earth
1 × Min. 4
1 × Min. 1.5
1 × Min. 2.5
Indoor unit-Outdoor unit
*2
3 × 1.5 (Polar)
Indoor unit-Outdoor unit earth
1 × Min. 1.5
Remote controller-Indoor unit
*3
2 × 0.3 (Non-polar)
Circuit rating
Outdoor unit L-N
Outdoor unit L1-N, L2-N, L3-N
*4
AC 230 V
Indoor unit-Outdoor unit S1-S2
*4
AC 230 V
Indoor unit-Outdoor unit S2-S3
*4
DC 24 V
Remote controller-Indoor unit
*4
DC 12 V
*1. A breaker with at least 3.0 mm contact separation in each poles shall be provided. Use earth leakage breaker (NV).
*2. Max. 45 m
If 2.5 mm
2
used, Max. 50 m
If 2.5 mm
2
used and S3 separated, Max. 80 m
*3. The 10 m wire is attached in the remote controller accessory.
*4. The figures are NOT always against the ground.
S3 terminal has DC 24 V against S2 terminal. However between S3 and S1, these terminals are NOT electrically insulataed by the transformer or other device.
Notes: 1. Wiring size must comply with the applicable local and national code.
2. Power supply cords and Indoor/Outdoor unit connecting cords shall not be lighter than polychloroprene sheathed flexible cord. (Design 60245 IEC 57
)
3. Install an earth longer than other cables.
Never splice the power cable or the indoor-outdoor connection cable, otherwise it may result in a smoke, a fire or communication failure.
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