Mitsubishi EHPT20X-MHCW, Service Manual

Page: 36 / 108

S1
S2
S3
L
N
L
N
CN01
CN01
CN01
CN01
S1
S2
S3
L
N
S1
S2
S3 S1
S2
S3
TB1
L
N
L
N
ECB1
ECB2
L
N
36
Initial settings
(Power supplied by
outdoor unit)
Modified settings
(Separate power
supply to the cylinder
unit)
Cylinder unit
control board
Cylinder unit
control board
White
BLACK BLACK
YELLOW
BLACK
YELLOW
YELLOW
YELLOW
BLACK
White
Option 2: Cylinder unit powered by independent source.
If the cylinder unit and outdoor unit have separate power supplies, the following
requirements MUST be carried out:
• Change the interconnected wiring in the control and electrical box of the
cylinder unit (see Figure 7-3).
• Turn the outdoor unit DIP switch SW8-3 to ON.
• Turn on the outdoor unit BEFORE the cylinder unit.
• 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.
Wiring
circuit
breaker
or
Isolating
switch
Power
supply
~/N
230 V
50 Hz
Earth
leakage
circuit
breaker
*
1,
*
2
Earth
leakage
circuit
breaker
*
1,
*
2
Wiring
circuit
breaker
or
Isolating
switch
Power
supply
~/N
230 V
50 Hz
Outdoor unit
Cylinder unit
Power
supply
~/N
230 V
50 Hz
Power
supply
~/N
230 V
50 Hz
Wiring
circuit
breaker
or
Isolating
switch
Wiring
circuit
breaker
or
Isolating
switch
For
booster
heater
(Primary circuit)
For
Immersion
heater
(DHW tank)
To control
board
<1 phase>
<Figure 7-4>
Electrical connections 1 phase
<Figure 7-3>
Description Power supply Capacity Breaker Wiring
Booster heater (Primary circuit) ~/N 230 V 50 Hz 2 kW 16 A * 2 2.5 mm²
6 kW 32 A
* 2
6.0 mm²
Immersion heater (DHW tank) ~/N 230 V 50 Hz 3 kW 16 A
* 2
2.5 mm²
Cylinder unit power supply ~/N 230 V 50 Hz
Cylinder unit input capacity
Main switch (Breaker)
* 2
16 A
Wiring
Wiring
No.
×
size
(mm²)
Cylinder unit power supply 2 × Min. 1.5
Cylinder unit power supply earth 1 × Min. 1.5
Cylinder unit - Outdoor unit
* 3
2 × Min. 0.3
Cylinder unit - Outdoor unit earth —
Circuit
rating
Cylinder unit L - N
* 4
230 V AC
Cylinder unit - Outdoor unit S1 - S2
* 4
—
Cylinder unit - Outdoor unit S2 - S3
* 4
24 V DC
* 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
Maximum 120 m
* 4
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 line longer than power cables.
4. Please keep enough output capacity of power supply for each heater. Insufficient power supply capacity might cause chattering.
* 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.
Affix label B that is included with the manuals near
each wiring diagram for cylinder unit and outdoor units.
OCH570C