Mitsubishi Electric EHPT17X-VM2E Service Manual page 28

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 model name. 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 cylinder unit and outdoor units.
Description Power supply Capacity
Booster heater ~/N 230 V
(Primary circuit) 50 Hz
Immersion heater ~/N 230 V
(DHW tank) 50 Hz
Indoor unit power supply
Indoor unit input capacity
Main switch (Breaker)
Indoor unit power supply
Indoor unit power supply earth
Wiring No.× size (mm²)
Indoor unit - Outdoor unit
Indoor unit - Outdoor unit earth
Indoor unit L - N
Circuit rating Indoor unit - Outdoor unit S1 - S2
Indoor unit - Outdoor unit S2 - S3
*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. 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.
Note: 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.
OCH814A
Power supply
~/N 230 V 50 Hz
Breaker Wiring
2 kW 16 A *2 2.5 mm²
6 kW 32 A *2 6.0 mm²
3 kW 16 A *2 2.5 mm²
*2
*3
*4
*4
*4
Initial settings
(Power supplied by
outdoor unit)
Modified settings
(Separate power
supply to the indoor
unit)
Earth
leakage
circuit
Power supply
breaker
~/N 230 V 50 Hz
*1, *2
Wiring
Earth
circuit
leakage
breaker
circuit
or
breaker
Isolating
*1, *2
switch
Power supply
~/N 230 V 50 Hz
Power supply
~/N 230 V 50 Hz
<Figure 7.4>
Electrical connections 1 phase
~/N 230 V 50 Hz
16 A
2 × min. 1.5
1 × min. 1.5
2 × min. 0.3
—
230 V AC
—
24 V DC
28
L
N
CN01
S1
Indoor unit
S2
control board
S3
L
N
CN01
S1
Indoor unit
S2
control board
S3
<Figure 7.3>
Cylinder unit
TB1
Wiring
circuit
breaker
L
To control
or
board
Isolating
N
switch
Outdoor unit
L
S1
S1
N
S2 S2
S3 S3
ECB1
Wiring
circuit
For
L
breaker
booster
or
heater
N
Isolating
(Primary circuit)
switch
Wiring
ECB2
circuit
For
breaker
L Immersion
or
heater
Isolating
(DHW tank)
switch N