11
WIRING SPECIFICATIONS
6
FIELD ELECTRICAL WIRING (power wiring specifications)
Caution: Be sure to install N-line. Without N-line, it could damage the unit.
Notes: 1. Wiring size must comply with the applicable local and national codes.
2.
Power supply cables and the cables between Controller and Outdoor unit shall not be lighter than polychloroprene sheathed
fl exible cables. (Design 60245 IEC 57)
3. Be sure to connect the cables between 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 insuffi cient
insulation to ground or a poor electrical contact .
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.
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85V
Outdoor unit power supply
~/N (single), 50 Hz, 230 V
25A
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Wiring
Wire No. ×
size (mm²)
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Interface unit/Flow temp. controller-Outdoor unit
*2
3 × 1.5 (polar)
1 × Min. 1.5
3 × Min. 4
2 × 0.3 (Non-polar)
AC 230V
AC 230V
DC 24V
DC 12V
Interface unit/Flow temp. controller-Outdoor unit earth
*2
Remote controller-Interface unit/Flow temp. controller
Circuit rating
Outdoor unit L-N (single)
*3
Interface unit/Flow temp. controller-Outdoor unit S1-S2 *3
Interface unit/Flow temp. controller-Outdoor unit S2-S3 *3
Remote controller-Interface unit/Flow temp. controller
*3
*1.A breaker with at least 3.0 mm contact separation in each poles shall be provided. Use earth leakage breaker (NV).
*2.Max. 80 m
*3.The figures are NOT always 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.
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 Interface unit/Flow temp. controller and outdoor unit, please use 3-pole type.
S1
S2
S3
S1
S2
S3
A-Control
Outdoor Unit
3 poles isolator
Power supply
Isolator
Interface unit/
Flow temp. controller
