14
For higher temperatures, the supply wire diameter
should be adapted according the derating factor.
Ambient T° (°C)
Current derating (%)
25
100
30
92
35
85
40
75
45
65
50
53
55
38
Power
25%
50%
75%
100%
SW1
0
1
0
1
SW2
0
0
1
1
25% = Only 1 stage
50% = Only stages 1 & 2
75% = Only stages 1 to 3
100% = All stages
POWER LIMITATION
The maximum power of the boiler can be limited
from 25 to 100% by acting on the SW1, SW2 electrical
bridges as mentioned in the table below:
Essential recommendation for the correct
operation of the system.
• Any change to the power limitation will alter
the current once the boiler has switched to
stand-by (busy signal is OFF). The external
management system can then open the ON/
OFF link.
• The external controller should NOT allow
the boiler to run continuously more than
24 hours. It is therefore necessary to
consider a minimum downtime of 1 hour.
CONTROL CIRCUIT TERMINAL
Power (L)
Power (PE)
Power (N)
230 V OUT (L)
230 V OUT (PE)
230 V OUT (N)
Safety relay (L)
Safety relay (N)
Central heating demand (OUT)
Central heating demand (IN)
DHW demand (IN)
DHW demand (OUT)
Central heating pump 230 V
Central heating pump (N)
Central heating pump (PE)
DHW pump 230 V
DHW pump (PE)
DHW pump (N)
Water pressure alarm 230 V
Water pressure alarm (N)
Safety thermostat alarm 230 V
Safety thermostat alarm (N)
Heating ON signal (busy) 230 V
Heating ON signal (busy) (N)
ON / OFF switch
ON / OFF switch
Heating power SW1
Heating power SW1
Heating power SW2
Heating power SW2
2
1
3
5
15
17
4
7
9
10
11
12
13
16
19
21
23
25
26
27
28
29
30
6
8
14
18
20
22
24
Diameter (mm2)
Current (Amp)
1,5
16
2,5
25
4,6
36
10
47
16
65
25
87
35
115
50
143
70
178
95
220
120
265
150
310
185
355
240
480
SIZING OF SUPPLY WIRES
The supply wires are sized depending of the type and
current of the MCB. The MCB last is sized depending
of the nominal current of the boiler. The admissible cur-
rent of the supply wires depends of the ambient tem-
perature, the section, the length and the insulation of
the wires, the wires ducts, the mounting and the envi-
ronment.
The following values are given for information for an
ambient temperature of 25°C and a maximum length of
5 meters. In all the circumstances, the installation must
be in accordance with the current wiring regulations.
EN
Installation
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