Mitsubishi Electric EHSD-MEC Installation Manual page 18

4
Installation
Option2: Hydrobox powered by independent source
If the hydrobox and outdoor units have separate power supplies, the following
requirements MUST be carried out:
• Change connector connections in hydrobox control and electrical box
(see Figure 4.4.4).
• Turn the outdoor unit DIP switch SW8-3 to ON.
• Turn on the outdoor unit BEFORE the hydrobox.
• Power by independent source is not available for particular models of
outdoor unit model.
For more detail, refer to the connecting outdoor unit installation manual.
<1 phase>
Affix label B that is included with the manuals near
each wiring diagram for hydrobox and outdoor units.
Power
supply
~/N
230 V
50 Hz
Earth
Wiring
leakage circuit
Power
circuit
breaker or
supply
breaker
Isolating
~/N
switch
*1, *2
230 V
50 Hz
Electrical connections 1 phase
<3 phase>
Affix label B that is included with the manuals near
each wiring diagram for hydrobox and outdoor units.
Power
supply
~/N
230 V
50 Hz
Earth
Power
leakage
supply
circuit
3N~
breaker
400 V
*1, *2
50 Hz
Power supply
3~ 400 V 50 Hz (EH**-YM9(E)C)
3~ 230 V 50 Hz (EHSC-TM9C)
Electrical connections 3 phase
Hydrobox power supply
Hydrobox input capacity
Main switch (Breaker)
Hydrobox power supply
Hydrobox power supply earth
Hydrobox - Outdoor unit
Hydrobox - Outdoor unit earth
Hydrobox L - N
Hydrobox - Outdoor unit S1 - S2
Hydrobox - Outdoor unit S2 - S3
Notes: 1. Wiring size must comply with the applicable local and national codes.
2. Indoor unit/outdoor unit connecting cords shall not be lighter than polychloroprene sheathed flexible cord. (Design 60245 IEC 57)
Indoor 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 heater. Insufficient power supply capacity might cause chattering.
17
Earth
Wiring
leakage
circuit
circuit
breaker or
breaker
Isolating
*1, *2 switch
Outdoor unit
L
S1
N
S2
S3
Wiring
circuit
Power
breaker or
supply
Isolating
~/N
switch
230V
50Hz
<Figure 4.4.5>
Earth
Wiring
leakage
circuit
circuit
breaker or
breaker
Isolating
*1, *2 switch
Outdoor unit
L1
S1
Wiring
L2 S2
circuit
breaker or
L3
S3
Isolating
switch
N
Wiring
circuit
breaker or
Isolating
switch
<Figure 4.4.6>
~/N 230 V 50 Hz
*2
2 × Min. 1.5
1 × Min. 1.5
*3 2 × Min. 0.3
*4 230 V AC
*4
*4 24 V DC
Hydrobox
TB1
L
N
S1
To control
S2
board
S3
*1 If the installed earth leakage circuit breaker does not have
ECB1
For
L
booster
heater
N
(Primary circuit)
Description
Booster heater
(Primary circuit)
Hydrobox
TB1
L
N
To control
board
S1
S2
S3
*1 If the installed earth leakage circuit breaker does not have
ECB1
an over-current protection function, install a breaker with that
function along the same power line.
L1 For
booster
L2
heater
(Primary circuit)
Description
L3
Booster heater
(Primary circuit)
16 A
*2. 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.
*3. Max. 120 m
—
*4. The values given in the table above are not always measured against
the ground value.
L
N
Initial settings
(Power supplied
S1
by outdoor unit)
S2
S3
L
N
Modified settings
(Separate power
supply to
the hydrobox)
S1
S2
S3
<Figure 4.4.4>
an over-current protection function, install a breaker with that
function along the same power line.
Power supply Capacity Breaker
~/N 230 V 50 Hz
Power supply Capacity Breaker
3~ 400 V 50 Hz 9 kW
3~ 230 V 50 Hz 9 kW
White
CN01
Hydrobox
control board
White
CN01
Hydrobox
control board
Wiring
2 kW 16 A *2 2.5 mm²
6 kW 32 A *2 6.0 mm²
Wiring
16 A *2 2.5 mm²
32 A *2 6.0 mm²