Mitsubishi Electric PUHZ-SW HA Series Installation Manual page 11

7. Electrical work
Notes: 1. Wiring size must comply with the applicable local and national codes.
2. Power supply cables and the cables between Interface unit/Flow temp. controller and outdoor unit shall not be lighter than polychloroprene sheathed
 exible cables. (Design 60245 IEC 57)
3. Be sure to connect the cables between Interface unit/Flow temp. controller and outdoor unit directly to the units (no intermediate connections are al-
lowed).
Intermediate connections may result in communication errors. If water enters at the intermediate connection point, it may cause insuf cient insula-
tion to ground or a poor electrical contact .
(If an intermediate connection is necessary, be sure to take measures to prevent water from entering the cables.)
4. Install an earth longer than other cables.
5. Do not construct a system with a power supply that is turned ON and OFF frequently.
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.
Never splice the power cable or the indoor-outdoor connection cable, otherwise it may result in a smoke, a  re or communication failure.
INDOOR-OUTDOOR CONNECTING CABLE (SW160, 200)
Cross section of cable Wire size (mm
Round
Flat
Flat
Round
*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 at cables are connected as this picture, they can be used up to 30 m.
7.3. Breaker size setting (only for SW75)
The breaker size can be changed with DIP switches SW7-4,5 on the Control board.
SW7
Both for indoor unit
4 5
and outdoor unit
OFF OFF 25A (Default)
OFF ON
ON ON
*1. Execute setting with the power of the unit OFF. The setting becomes valid when power is restored.
*2. Capacity restrictions may apply when operating under a high-load with a reduced breaker size.
Power
supply
Isolator
S1
Outdoor Unit
S2
S3
) Number of wires
2
2.5 3
2.5 3
1.5 4
2.5 4
2 .
Breaker size
Only for outdoor unit
20A
20A 16A
16A —
3 poles isolator
Polarity
Clockwise : S1-S2-S3
*Pay attention to stripe of yellow and green
Not applicable
(Because center wire has no cover nish)
From left to right : S1-Open-S2-S3
Clockwise : S1-S2-S3-Open
*Connect S1 and S3 to the opposite angle
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
Indoor unit
S2
(Interface unit /
Flow temp.
controller)
S3
(3C Flat cable × 2)
L (m)*6
(30)
*2
Not applicable
*5
(18)
*3
(30)
*4