Test Run - Mitsubishi Electric PAC-AK53BC Installation Manual

9. 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 outdoor unit and branch box/indoor unit and branch box, please use 3-poles type.
Caution:
After using the isolator, be sure to turn off and on the main power supply to reset the system. Otherwise, the outdoor unit may not be able to detect the
branch box(es) or indoor units.
WIRING SPECIFICATIONS
(OUTDOOR-BRANCH BOX CONNECTING CABLE)
Cross section of cable Wire size (mm²) Number of wires
Round
Flat
Flat
Round
*1 :Power supply cords of appliances shall not be lighter than design 6045 IEC or
607 IEC.
* : In case that cable with stripe of yellow and green is available.
*3 : In case of regular polarity connection (S1-S-S3), wire size is 1.5 mm².
*4 : In case of regular polarity connection (S1-S-S3).
*5 : In the flat cables are connected as this picture, they can be used up to 55 m.
When connecting indoor unit of PEAD series, they can be used up to 50 m.
Be sure to connect the outdoor-branch box/indoor-branch box connecting cables directly to the units (no intermediate connections).
Intermediate connections can lead to communication errors if water enters the cables and causes insufficient insulation to ground or a poor electrical contact at the in-
termediate connection point.

10. Test run

• Refer to the "Test run" section of the installation manual of the indoor units and outdoor unit.
• When installation of the indoor unit, branch box, and outdoor unit is complete, begin test run to check for water leaks in the branch box.
• After power is supplied or after an operation stop for a while, a small clicking noise may be heard from the inside of the branch box. The electronic expan-
sion valve is opening and closing. The unit is not faulty.
• Be sure to perform the test run for each indoor unit. Make sure each indoor unit operates properly following the installation manual attached to the unit.
• If you perform the test run for all indoor units at once, you cannot detect any erroneous connection, if any, of the refrigerant pipes and the indoor/outdoor unit connecting
wires.
Power supply
3 poles isolator (Switch)
Isolator (Switch)
S1
Outdoor unit
S2
S3
Clockwise : S1-S-S3
* Pay attention to stripe of yellow and green
.5 3
Not applicable
(Because center wire has no cover finish)
.5 3
From left to right : S1-Open-S-S3
1.5 4
Clockwise : S1-S-S3-Open
*Connect S1 and S3 to the opposite angle
.5 4
S1 S1
Branch
S2 S2
box
S3 S3
Polarity
S1 S2 S3
*6 : Mentioned cable length is just a reference value.
It may be different depending on the condition of installation, Humidity or
materials, etc.
S1
"A-control"
S2
Indoor unit
S3
L (m)*6
When PEAD-series
Other
units are included
(50) (50)
*
Not applicable Not applicable
*5
(45) (30)
*3
(55) (50)
*4
(3C Flat cable 2)
*
*5
*3
*4
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