Wiring Specifications - Mitsubishi MXZ-8B140VA Technical & Service Manual

10

WIRING SPECIFICATIONS

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 units and branch box, please use 3-pole type.
Power supply
Isolator (Switch)
S1
Outdoor unit
S2
S3
<CAUTION>
After using isolator, be sure to turn off and on the main power supply to reset the system.
Otherwise, 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 (e)
Round
Flat
Flat
Round
*1 : Power supply cords of appliances shall not be lighter than design 60245 IEC or 60227 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
*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.
*6 : Mentioned cable length is just a reference value.
It may be different depending on the condition of installation, humidity or materials, etc.
Be sure to connect the outdoor-branch box / indoor units-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.
(If an intermediate connection is necessary, be sure to take measures to prevent water from entering the cables.)
OCH480D
3 poles isolator (Switch)
S1
S2
S3
Branch - box
Number of wires
2.5 3
2.5 3
1.5 4
2.5 4
S1
S2
S3
Polarity
Clockwise : S1-S2-S3
w Pay attention to stripe of yellow and green.
Not applicable
(Because center wire has no cover finish)
From left to right : S1-Open-S2-S3
Clockwise : S1-S2-S3-Open
w Connect S1 and S3 to the opposite angle.
mm .
2
S1
58
S1
"A-Control"
Indoor unit
S2
S3
L (m) w 6
(50)
Not applicable
(45)
(55)
(3C Flat cable o 2)
S2 S3
w 2
w 5
w 3
w 4