Mitsubishi Electric Ecodan EHSC series Installation Manual page 27

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 4.5.7).
• Turn the outdoor unit DIP switch SW8-3 to ON.
• Turn on the outdoor unit BEFORE the hydrobox.
<1 phase>
Power
Earth
supply
leakage
~/N
circuit
230V
breaker
50Hz
*1
*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 hydrobox and outdoor units.
Description
Booster heater (Primary circuit)
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
*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. 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. The lack of the power supply capacity might cause
chattering.
Power
Earth
supply
leakage
~/N
circuit
230V
breaker
50Hz
*1
Outdoor unit
L
Wiring
circuit
N
breaker or
Isolating
switch
Power
supply
~/N
230V
50Hz
<Figure 4.5.8>
Electrical connections 1 phase
Power supply Capacity
~/N 230 V 50 Hz 2 kW
6 kW
~/N 230 V 50 Hz
*1
*2
*3
*3
*3
Initial settings
(Power supplied
by outdoor unit)
Modified settings
(Separate power
supply to
the hydrobox)
Hydrobox
TB1
L
Wiring
circuit
N
breaker or
Isolating
switch
S1
S1
To control
S2
S2
board
S3
S3
ECB1
For
booster
L
Wiring
heater
circuit
(Primary circuit)
N
breaker or
Isolating
switch
Breaker Wiring
16 A *1 2.5 mm²
32 A *1 6.0 mm²
16 A
2 × Min. 1.5
1 × Min. 1.5
2 × Min. 0.3
—
230V AC
—
24V DC
L
N
Black
CN01
Hydrobox
S1
control board
S2
S3
L
N
Black
CN01
S1
Hydrobox
control board
S2
S3
<Figure 4.5.7>
26