Option 2: Cylinder Unit Powered By Independent Source - Mitsubishi Electric EHST17D-VM2D Service Manual

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.
<1 phase>
Affix label B that is included with the manuals near
each wiring diagram for cylinder unit and outdoor units.
Power supply
~/N 230 V 50 Hz
Earth
leakage
circuit
Power supply
breaker
~/N 230 V 50 Hz
*1, *2
Description Power supply
Booster heater (Primary circuit)
Immersion heater (DHW tank)
Cylinder unit power supply
Cylinder unit input capacity
Main switch (Breaker)
Cylinder unit power supply
Cylinder unit power supply earth
Cylinder unit - Outdoor unit
Cylinder unit - Outdoor unit earth
Cylinder unit L - N
Cylinder unit - Outdoor unit S1 - S2
Cylinder unit - Outdoor unit S2 - S3
Maximum 120 m
*3.
The values given in the table above are not always measured against the ground value.
*4.
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.
OCH714A
Earth
leakage
circuit
breaker
*1, *2
Outdoor unit
Wiring
circuit
breaker
L
or
Isolating
N
switch
Power supply
~/N 230 V 50 Hz
Power supply
~/N 230 V 50 Hz
<Figure 7-4>
Electrical connections 1 phase
Capacity
~/N 230 V 50 Hz 2 kW
6 kW
~/N 230 V 50 Hz 3 kW
~/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
Initial settings
(Power supplied by
outdoor unit)
Modified settings
(Separate power
supply to the cylinder
unit)
Cylinder unit
Wiring TB1
circuit
breaker
To control
L
or
board
Isolating
N
switch
S1 S1
S2 S2
S3 S3
ECB1
Wiring
For
circuit
L
booster
breaker
heater
or
N
(Primary circuit)
Isolating
switch
ECB2
Wiring
circuit
For
breaker L
Immersion
or
heater
N
Isolating
(DHW tank)
switch
Breaker Wiring
*2
16 A 2.5 mm²
32 A *2 6.0 mm²
16 A *2 2.5 mm²
16 A
—
—
21
L
N
White
CN01
Cylinder unit
S1
control board
S2
S3
L
N
White
CN01
Cylinder unit
S1
control board
S2
S3
<Figure 7-3>
If the installed earth leakage circuit breaker
*1.
does 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 sepa-
*2.
ration in each pole shall be provided. Use
earth leakage breaker (NV).
The breaker shall be provided to ensure dis-
connection of all active phase conductors of
the supply.