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4. Electrical work
Option 2: FTC4 (Master) powered by independent source
If FTC4 (Master) and outdoor units have separate power supplies, the following require-
ments MUST be carried out:
• FTC4 (Master) unit electrical box connector connections changed (see Fig. 4.1.3)
• Outdoor unit DIP switch settings changed to SW-3 ON
• Turn on the outdoor unit before the FTC4 (Master).
Clamps
Clamp
1
2
3 4 5
Notes: 1. Do not run the low voltage cables through a slot that the high voltage cables go through.
2. Do not run other cables through a slot that the wireless receiver's cable goes through.
3. Do not bundle power cables together with other cables.
4. Bundle cables as figure above by using clamps.
<1 phase>
Power
Earth
supply
leakage
~/N
circuit
230V
breaker
50Hz
Wiring
Power
Earth
circuit
supply
leakage
breaker
~/N
or
circuit
230V
Isolating
breaker
switch
50Hz
Power
supply
*1 If the installed earth leakage circuit breaker does not have an over-current protection function, install a breaker with that function along the same power line.
*2 Affix label B that is included with the manuals near each wiring diagram for FTC4 (Master) and outdoor units.
Note: In accordance with IEE regulations the circuit breaker/isolating switch located on the outdoor unit should be installed with lockable devices (health and safety).
FTC4 (Master) power supply
FTC4 (Master) input capacity
Main switch (Breaker)
FTC4 (Master) power supply
FTC4 (Master) power supply earth
FTC4 (Master) - Outdoor unit
FTC4 (Master) - Outdoor unit earth
FTC4 (Master) L - N
FTC4 (Master) - Outdoor unit S1 - S2 *3
FTC4 (Master) - Outdoor unit S2 - S3 *3
12
TB2
TB1
Clamps
Slot
1
High voltage cables (OUTPUT)
2
Low voltage cables (INPUT)
3
Wireless receiver's cable
4
Thermistor cables
5
Power cables
FTC4 (Master)
TB2
Wiring
L
circuit
breaker
N
or
Isolating
switch
Outdoor unit
TB1
L
S1
S1
To control
S2
N
S2
board
S3
S3
ECB
ELB for
Wiring
immersion
L
circuit
heater
breaker
N
(DHW tank)
or
Isolating
switch
Electrical connections 1 phase/3 phase
~/N 230 V 50 Hz
*1
16 A
2 × Min. 1.5
1 × Min. 1.5
*2
2 × Min. 0.3
—
*3
AC230V
—
DC24V
L
N
Initial settings
(Power supplied
S1
by outdoor unit)
S2
S3
L
N
Modified settings
(Separate power
supply to
S1
FTC4(Master))
S2
S3
<3 phase>
Power
Earth
supply
leakage
~/N
circuit
230V
breaker
50Hz
Power
Wiring
Earth
supply
circuit
leakage
breaker
3N~
circuit
or
400V
Isolating
breaker
50Hz
switch
Power
supply
*1. A breaker with at least 3.0 mm contact separation in each pole shall be
provided. Use earth leakage breaker (NV).
The breaker shall be provided to ensure disconnection of all active phase
conductors of the supply.
*2. Max. 120 m
*3. The values given in the table above are not always measured against the
ground value.
Notes: 1. Wiring size must comply with the applicable local and national codes.
2. FTC4 (Master) unit/outdoor unit connecting cords shall not be lighter
than polychloroprene sheathed flexible cord. (Design 60245 IEC 57)
FTC4 (Master) unit power supply cords shall not be lighter than
polychloroprene sheathed flexible cord. (Design 60227 IEC 53)
3. Install an earth longer than other cables.
4. Please keep enough output capacity of power supply for each
individual heater. Insufficient power supply capacity might cause
chattering.
Black
CNO1
FTC4
(Master)
Black
CNO1
FTC4
(Master)
FTC4 (Master)
TB2
Wiring
L
circuit
breaker
N
or
Isolating
switch
Outdoor unit
TB1
L1
S1
S1
L2
To control
S2
S2
board
L3
S3
S3
N
ECB
ELB for
Wiring
L
immersion
circuit
heater
breaker
N
(DHW tank)
or
Isolating
switch
: PAC-IF051B-E
: PAC-IF052B-E
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