Electrical Work - Mitsubishi Electric PAC-IF051B-E Installation Manual

4. Electrical work

4.1 Electrical connection
All electrical work should be carried out by a suitably qualified technician. Failure
to comply with this could lead to electrocution, fire, and death. It will also invalidate
product warranty. All wiring should be according to national wiring regulations.
For multiple outdoor units control with FTC4 (Slave), see section 9.
FTC4 (Master) can be powered in two ways.
1. Power cable is run from the outdoor unit to FTC4 (Master).
2. FTC4 (Master) has independent power source
Connections should be made to the terminals indicated in the following figures de-
pending on the phase.
Breaker abbreviation Meaning
ECB Earth leakage circuit breaker for immersion heater
TB1 Terminal bed 1
TB2 Terminal bed 2
Immersion heater should be connected independently from one another to dedi-
cated power supplies.
Option 1: FTC4 (Master) powered via outdoor unit
<1 phase>
Wiring
Power
circuit
Earth
supply
breaker
leakage
~/N
or
circuit
230V
Isolating
breaker
50Hz switch
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 A 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) - Outdoor unit
FTC4 (Master) - Outdoor unit earth
FTC4 (Master) - Outdoor unit S1 - S2
FTC4 (Master) - Outdoor unit S2 - S3
*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. 45 m
If 2.5 mm² used, Max. 50 m
If 2.5 mm² used and S3 separated, Max. 80 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)/outdoor unit connecting cords shall not be lighter than polychloroprene sheathed flexible cord. (Design 60245 IEC 57)
FTC4 (Master) 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.
FTC4 (Master)
TB2
L
Outdoor unit
N
TB1
To control
board
L S1
S1
S2
N
S2
S3
S3
ECB
ELB for
Wiring
L
immersion
circuit
heater
breaker
N
or (DHW tank)
Isolating
switch
Electrical connections 1 phase/3 phase
*2 3 × 1.5 (polar)
*2 1 × Min. 1.5
*3 AC230V
*3 DC24V
Clamps
Clamp
1 2 3 4 5
<Fig. 4.1.1> Wiring for PAC-IF052B-E
Notes: 1. Do not run the low voltage cables through a slot that the high volt-
age 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.
<3 phase>
Power
Wiring
Earth
supply
circuit
leakage
3N~
breaker
circuit
400V
or
breaker
50Hz Isolating
switch
Power
supply
<Fig. 4.1.2>
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
L
Outdoor unit
N
L1
TB1
To control
L2
board
S1
S1
L3
S2
S2
N
S3
S3
ECB
ELB for
Wiring
L
immersion
circuit
heater
breaker
N
or (DHW tank)
Isolating
switch
: PAC-IF051B-E
: PAC-IF052B-E
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