Electrical Connection - Mitsubishi Electric ecodan ERST20 series Installationshandbuch

4
installation

4.5 electrical Connection

All electrical work should be carried out by a suitably qualified technician. Failure
to comply with this could lead to electrocution, fire, and death. It will also invali-
date product warranty. All wiring should be according to national wiring regula-
tions.
Breaker abbreviation Meaning
ECB1 Earth leakage circuit breaker for booster heater
ECB2 Earth leakage circuit breaker for immersion heater
TB1 Terminal block 1
ECB1 ECB2
A
F
E B
D C
TB1
<1 phase (with immersion heater)>
Option 1: Cylinder unit powered via outdoor unit
<1 phase>
Affix label A that is included with the manuals near each
wiring diagram for cylinder unit and outdoor units.
Power
supply
~/N
230 V
50 Hz
description
Booster heater (Primary circuit)
Immersion heater (DHW tank)
Cylinder unit - Outdoor unit
Cylinder unit - Outdoor unit earth
Cylinder unit - Outdoor unit S1 - S2
Cylinder unit - Outdoor unit S2 - S3
*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. 45 m
If 2.5 mm² used, Max. 50 m
If 2.5 mm² used and S3 separated, Max. 80 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.
ECB1 ECB2
A
E
F
B
D C
TB1
<3 phase (with immersion heater)>
Wiring
L
circuit
breaker
Earth N
or
leakage
Isolating
circuit
switch
breaker
*1 ,*2
Power
supply
~/N
230 V
50 Hz
Power
supply
~/N
230 V
50 Hz
<Figure 4.5.1>
Electrical connections 1 phase
Power supply
~/N 230 V 50 Hz
~/N 230 V 50 Hz
*3
*3
*4
*4
The cylinder unit can be powered in two ways.
1. Power cable is run from the outdoor unit to the cylinder unit.
2. Cylinder unit has independent power source
Connections should be made to the terminals indicated in the figures to the left
below depending on the phase.
Booster heater and immersion heater should be connected independently from
one another to dedicated power supplies.
Locally supplied wiring should be inserted through the inlets situated on the
top of the cylinder unit. (Refer to <Table 3.3>.)
Wiring should be fed down the right hand side of the control and electrical
box and clamped in place using clips provided.
The wires should be inserted individually through the cable inlets as below.
Outputs wire
Signal input wire
Wireless receiver (option) wire
(PAR-WR51R-E)
and Power line and indoor-outdoor wire
Connect the outdoor unit – cylinder unit connecting cable to TB1.
Connect the power cable for the booster heater to ECB1.
If immersion heater is present, connect the power cable to ECB2.
• Avoid contact between wiring and parts (
• Make sure that ECB1 and ECB2 are ON.
• On completion of wiring ensure main remote controller cable is con-
nected to the relay connector.
Cylinder unit
TB1
L
Outdoor unit
N
To control
board
S1
S1
S2
S2
S3
S3
ECB1
For
booster
L
Wiring
heater
circuit
N (Primary circuit)
breaker or
Isolating
switch
ECB2
For
Immersion
L
Wiring
heater
circuit
N (DHW tank)
breaker or
Isolating
switch
Capacity 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
3 × 1.5 (polar)
1 × Min. 1.5
230 V AC
24 V DC
).
*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.
18