Mitsubishi Electric PAC-SIF051B-E, Installation Manual

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9. Multiple outdoor units control
9.3.1 Main unit
FTC (Main)
9.3 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 prod -
uct warranty. All wiring should be according to national wiring regulations.
FTC (Main)
TB1
TB2
S1
S2
S3
Power
supply
~/N
230V
50Hz
Earth
leakage
breaker
Wiring
circuit
breaker
or
or
Isolating
switch
Earth
leakage
breaker
circuit
L
N
<Fig. 9.3.1>
S1
S2
S3
L
N
L
N
BLACK BLACK
YELLOW YELLOW
YELLOW
YELLOW
BLACK
BLACK
CNO1
CNO1
CNO1
Black
CNO1
Black
FTC
(Main)
FTC
(Main)
S1
S2
S3
Initial settings
(Power supplied
by outdoor unit)
Modified settings
(Separate power
supply to
FTC(Main))
L N
S3 S2 S1
Power
supply
~/N
230V
50Hz
Earth
leakage
circuit
breaker
*1
Wiring
circuit
breaker
or
Isolating
switch
L
N
S1
S2
S3
Outdoor unit
S1
S2
S3
TB6 TB6
L
N
Power
supply
3N~
400V
50Hz
Earth
leakage
circuit
breaker
*1
Wiring
circuit
breaker
or
Isolating
switch
L3
L2
L1
N
S1
S2
S3
Outdoor unit
S1
S2
S3
FTC (Sub) FTC (Sub)
L
N
en
Outdoor unit must NOT be connected to FTC (Main) unit.
FTC (Main) unit electrical box connector connections changed. (see Fig. 9.3.2.)
9.3.2 Sub unit
Connect each outdoor unit to a sub unit.
FTC (Sub) can be powered in two ways.
1. Power cable is run from the outdoor unit to a sub unit.
2. FTC (Sub) has independent power source.
FTC (Main) (PAC-IF07*B-E) used as sub
• For wiring as a sub controller, refer to "4.1 Electrical connection". *1
*1 Do not connect the power cable to the booster heater because it does not work
in sub controller setting.
FTC (Sub) (PAC-SIF051B-E) <Fig. 9.3.3>
FTC (Sub) can be powered in two ways.
1. Power cable is run from the outdoor unit to FTC (Sub).
2. FTC (Sub) has independent power source.
Note:
•
Do not run the low voltage cables through a slot that the high voltage
cables go through.
•
Bundle cables by using clamps as shown in the figure to the right.
Option 1: FTC (Sub) powered via outdoor unit
<1 phase>
Low voltage cables (INPUT) &
Thermistor cables
High voltage cables (OUTPUT) &
Power cables
<Fig. 9.3.3>
Wiring
Wiring No.
× size (mm²)
FTC (Sub) - Outdoor unit *2 3 × 1.5 (polar)
FTC (Sub) - Outdoor unit earth *2 1 × Min. 1.5
Circuit rating
FTC (Sub) - Outdoor unit S1 - S2 *3 230 V AC
FTC (Sub) - Outdoor unit S2 - S3 *3 24 V DC
*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. FTC (Sub)/outdoor unit connecting cords shall not be lighter than polychloroprene sheathed flexible cord. (Design 60245 IEC 57)
FTC (Sub) power supply cords shall not be lighter than polychloroprene sheathed flexible cord. (Design 60227 IEC 53)
3. Install an earth longer than other cables.
*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.
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.
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).
<Fig. 9.3.4>
<Fig. 9.3.2>
<3 phase>