Mitsubishi Electric EHSC-MEC Service Manual page 31

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 7-3).
• 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
Power
Earth
supply
leakage
~/N
circuit
breaker or
230 V
breaker
Isolating
50 Hz
1, 2
* *
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.
OCH571D
Earth
Wiring
leakage
circuit
circuit
breaker or
breaker
Isolating
* 1, * 2
switch
Outdoor unit
Wiring
circuit
L
S1
N
S2
switch
S3
Power
Wiring
supply
circuit
~/N
breaker or
230V
Isolating
50Hz
switch
<Figure 7-4>
Wiring
Earth
circuit
leakage
breaker or
circuit
breaker Isolating
1, 2 switch
* *
Outdoor unit
L1
S1
Wiring
circuit
L2
S2
breaker or
Isolating
L3
S3
switch
N
Wiring
circuit
breaker or
Isolating
switch
<Figure 7-5>
~/N 230 V 50 Hz
*2
*3
*4
*4
*4
Hydrobox
TB1
L
N
To control
board
S1
S2
S3
ECB1
For
L
booster
heater
N
(Primary circuit)
Hydrobox
TB1
L
N
To control
board
*
S1
S2
S3
*
ECB1
L1
For
booster
L2
heater
L3 (Primary circuit)
3 Maximum 120 m
*
4 The values given in the table above are not always measured
*
16 A
against the ground value.
2 × Min. 1.5
1 × Min. 1.5
2 × Min. 0.3
—
230 V AC
—
24 V DC
31
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 7-3>
If the installed earth leakage circuit breaker does not
* 1
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
* 2
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.
Description Power supply Capacity Breaker Wiring
Booster heater ~/N 230 V
(Primary circuit) 50 Hz
If the installed earth leakage circuit breaker does
1
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
2
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.
Description Power supply Capacity Breaker Wiring
3~ 400 V
9 kW
50 Hz
Booster heater
(Primary circuit) 3~ 230 V
9 kW
50 Hz
White
CN01
Hydrobox
control board
White
CN01
Hydrobox
control board
2 kW 16 A 2 2.5 mm²
*
6 kW 32 A 6.0 mm²
* 2
16 A 2.5 mm²
* 2
32 A 2 6.0 mm²
*