Test Run; Before Test Run; Using Sw4 In Outdoor Unit; Using Remote Controller - Mitsubishi Electric P25 Installationshandbuch

6. Electrical work
6.3. Field electrical wiring
Outdoor unit model
Outdoor unit Power supply
Outdoor unit input capacity
Main switch (Breaker)
Max. Permissive System Impedance (Ω)
Outdoor unit power supply
Outdoor unit power supply earth
Indoor unit-Outdoor unit
Indoor unit-Outdoor unit earth
Remote controller-Indoor unit
Outdoor unit L-N
Outdoor unit L1-N, L2-N, L3-N
Indoor unit-Outdoor unit S1-S2
Indoor unit-Outdoor unit S2-S3
Remote controller-Indoor unit
*1. A breaker with at least 3 mm contact separation in each pole shall be provided. Use non-fuse breaker (NF) or earth leakage breaker (NV).
*2. Max. 45 m
2
If 2.5 mm 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 voltage are NOT against the ground.
S3 terminal has DC 24 V against S2 terminal. However between S3 and S1, these terminals are not electrically insulated 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 unit/Outdoor unit connecting cords shall not be lighter than polychloroprene sheathed flexible cord. (Design 245 IEC 57)
3. Install an earth longer than other cables.
Caution:
Do not push the contactor button (52C) on the outdoor unit, otherwise the compressor may be damaged.

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 1.0 MΩ Ω Ω Ω Ω .
s Do not carry out this test on the control wiring (low voltage circuit) terminals.
Warning:
Do not use the air conditioner if the insulation resistance is less than 1.0 MΩ 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.)
• 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.
7.2. Test run

7.2.1. Using SW4 in outdoor unit

1) PUH Type
SW4-1 ON
Cooling operation
SW4-2 OFF
SW4-1 ON
Heating operation
SW4-2 ON
2) PU Type
SW4-1 ON
Cooling operation
SW4-2 ON or OFF
* After performing the test run, set SW4-1 to OFF.
• After power is supplied, a small clicking noise may be heard from the inside of the outdoor
unit. The electronic expansion valve is opening and closing. The unit is not faulty.
• A few seconds after the compressor starts, a clanging noise may be heard from the
inside of the outdoor unit. The noise is coming from the check valve due to the small
difference in pressure in the pipes. The unit is not faulty.
8
P25V P35V P50V P60V
~/N (single), 50 Hz, 230 V
16 A 25 A
*1
0.35 0.26 0.12 0.09
2 × Min. 1.5 2 × Min. 2.5
1 × Min. 1.5 1 × Min. 2.5
*2
*3
*4
*4
*4
*4
P71V P100V P35Y P50Y
32 A
0.06 0.69 0.43
2 × Min. 4
1 × Min. 4
3 × 1.5 (polar)
1 × Min. 1.5
2 × 0.3 (Non-polar)
AC 230 V
AC 230 V
DC 24 V
DC 12 V
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.
The test run operation mode cannot be changed by DIP switch SW4-2 during
the test run. (To change the test run operation mode during the test run, stop
the test run by DIP switch SW4-1. After changing the test run operation mode,
resume the test run by switch SW4-1.)

7.2.2. Using remote controller

Refer to the indoor unit installation manual.
P60Y P71Y P100Y P125Y
3N~(3phase), 50 Hz, 400 V
16 A
0.36 0.23 0.22 0.14
4 × Min. 1.5 4 × Min. 2.5
1 × Min. 1.5 1 × Min. 2.5
P140Y
25 A
0.12