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Field Wiring - Mitsubishi Electric EHSC-VM2B Service Manual

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7

FIELD WIRING

Breaker abbreviation
Meaning
ECB1
Earth leakage circuit breaker for booster heater
TB1
Terminal block 1
Option 1: Hydrobox powered via outdoor unit
<1 phase>
Power
supply
~/N
230V
50Hz
*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 Affi x label A which is included with the manuals near each wiring diagram for hydrobox and outdoor units.
Description
Booster heater (Primary circuit)
Hydrobox - Outdoor unit
Hydrobox - Outdoor unit earth
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. 45 m
If 2.5 mm² used, Max. 50 m
If 2.5 mm² used and S3 separated, Max. 80 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 fl exible cord. (Design 60245 IEC 57)
Indoor unit power supply cords shall not be lighter than polychloroprene sheathed fl exible 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. Insuffi cient power supply capacity might cause chattering.
OCH532A
Wiring
Earth
circuit
leakage
breaker or
circuit
Isolating
breaker
switch
*1
Power
supply
~/N
230V
50Hz
<Figure 7-1>
Electrical connections 1 phase
Power supply
Capacity
~/N 230 V 50 Hz
2 kW
6 kW
*2
3 × 1.5 (polar)
*2
1 × Min. 1.5
*3
*3
TB1
Outdoor unit
L
S1
S1
S2
N
S2
S3
S3
ECB1
Wiring
circuit
breaker or
Isolating
switch
Breaker
Wiring
16 A *1
2.5 mm²
32 A *1
6.0 mm²
230V AC
24V DC
24
Hydrobox
L
N
To control
board
For
L
booster
heater
N
(Primary circuit)

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