Mitsubishi Electric M Series Manual page 584

MULTI SYSTEM Inverter Heat Pump
9. Electrical work
WIRING SPECIFICATIONS
(OUTDOOR-BRANCH BOX CONNECTING CABLE)
Cross section of cable Wire size (mm
Round
2.5
Flat
2.5
Flat
1.5
Round
2.5
*1 : Power supply cords of appliances shall not be lighter than design 60245 IEC or 227
IEC.
*2 : In case that cable with stripe of yellow and green is available.
*3 : In case of regular polarity connection (S1-S2-S3), wire size is 1.5 mm
*4 : In case of regular polarity connection (S1-S2-S3).
*5 : In the flat cables are connected as this picture, they can be used up to 55 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
intermediate 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 expansion
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.
C-582
2 ) Number of wires
Clockwise : S1-S2-S3
3
* Pay attention to stripe of yellow and green
Not applicable
3
(Because center wire has no cover finish)
4 From left to right : S1-Open-S2-S3
Clockwise : S1-S2-S3-Open
4
*Connect S1 and S3 to the opposite angle
.
2
Polarity
(3C Flat cable
S1 S2 S3
*6 : Mentioned cable length is just a reference value.
It may be different depending on the condition of installation, Humidity or materi-
als, etc.
M series
L (m)*6
(50)
*2
Not applicable
*5
(45)
*3
(55)
*4
2)