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8
WIRING SPECIFICATIONS
8-1. INDOOR UNIT POWER SUPPLIED FROM OUTDOOR UNIT (A-control application)
The following connection patterns are available.
The outdoor unit power supply patterns vary on models.
1:1 System Simultaneous twin system
A Outdoor unit power supply
B Wiring circuit breaker or isolating switch
C Outdoor unit
D Indoor unit/outdoor unit connecting cords
E Remote controller
F Indoor unit
G Indoor unit earth
S1
S2
L1
L2
GR
1
2
S1
S2
S3
S3
S1
S2
L1
L2
GR
1
2
S1
S2
S3
1
2
S1
S2
S3
S3
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.
* Affix a label A that is included with the manuals near each wiring diagram for the indoor and outdoor units.
Indoor unit model
PLA-A12, 18, 24, 30
PCA, PKA
PLA-A36, 42
1A 2A
15A 15A
––
A
C
B
D
E
A
C
B
D
E
FFF
GG G
Indoor unit power supply
Minimum circuit ampacity
Maximum rating of overcurrent protective device
*1. Max. 50 m, 165 ft
*2. The 10 m, 30 ft wire is attached in the remote controller accessory. Max. 1500 ft
*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.
1.Wiring size must comply with the applicable local and national code.
2.Use copper supply wires.
3.Use wires rated 600V or more for the power supply cables and the indoor/outdoor unit connecting cables.
4.Install an earth longer than other cables.
Notes:
Outdoor unit model
Outdoor unit power supply
Breaker size
Minimum circuit ampacity
Maximum rating of overcurrent protective device
Outdoor unit power supply
Outdoor unit power supply earth
Indoor unit-Outdoor unit *1
Indoor unit earth *1
Remote controller-Indoor unit *2
Outdoor unit L1-L2 *3
Indoor unit-Outdoor unit S1-S2 *3
Indoor unit-Outdoor unit S2-S3 *3
Remote controller-Indoor unit *3
A12 A18 A24 A30 A36 A42
Single, 208/230 V, 60 Hz Single, 208/230 V, 60 Hz Single, 208/230 V, 60 Hz Single, 208/230 V, 60 Hz Single, 208/230 V, 60 Hz Single, 208/230 V, 60 Hz
15A 15A 25A 30A 30A 30A
13A 13A 18A 25A 25A 26A
15A 20A 30A 40A 40A 40A
2 o Min. AWG 14 2 o Min. AWG 14 2 o Min. AWG 12 2 o Min. AWG 10 2 o Min. AWG 10 2 o Min. AWG 10
1 o Min. AWG 14 1 o Min. AWG 14 1 o Min. AWG 12 1 o Min. AWG 10 1 o Min. AWG 10 1 o Min. AWG 10
3 o AWG 16 (polar) 3 o AWG 16 (polar) 3 o AWG 16 (polar) 3 o AWG 16 (polar) 3 o AWG 16 (polar) 3 o AWG 16 (polar)
1 o Min. AWG 16 1 o Min. AWG 16 1 o Min. AWG 16 1 o Min. AWG 16 1 o Min. AWG 16 1 o Min. AWG 16
2
o
AWG 22 (Non-polar) 2
o
AWG 22 (Non-polar) 2
o
AWG 22 (Non-polar) 2
o
AWG 22 (Non-polar) 2
o
AWG 22 (Non-polar) 2
o
AWG 22 (Non-polar)
AC 208/230 V AC 208/230 V AC 208/230 V AC 208/230 V AC 208/230 V AC 208/230 V
AC 208/230 V AC 208/230 V AC 208/230 V AC 208/230 V AC 208/230 V AC 208/230 V
DC 24 V DC 24 V DC 24 V DC 24 V DC 24 V DC 24 V
DC 12 V DC 12 V DC 12 V DC 12 V DC 12 V DC 12 V
Wiring
Wire No. o
size
Circuit
rating
S1
S2
S3
S1
S2
S3
A-Control
Outdoor Unit
3 poles isolator
230V
Single phase
Isolator
A-Control
Indoor Unit
OCH429--1.qxp 07.11.20 9:17 AM Page 20