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2.2.3 Example 2 - Voltage free contact (fig. 6)
The example shows how a voltage free contact from
the boiler control is connected to the EBC12.
•
Connect the power supply to terminals 1-3.
•
Connection to the boiler automatic:
• Connect the voltage free contact to termi-
nals 4 and 9.
• Loop terminals 7 and 8.
• Connect the burner start signal to terminals
14 and 15.
•
Connect the chimney fan to terminals 19-21.
•
Connect the pressure transducer (XTP) to
terminals 22-24.
Terminals (fig. 6)
1
Supply L1
2
Supply N
3
Supply PE
4-5
Boiler thermostat. Opto coupler (-)(10-230V)
6-7
Boiler thermostat. Opto coupler (+)(10-230V)
8
24V DC supply to voltage free contact (boiler
thermostat)
9
0V DC supply to voltage free contact (boiler
thermostat)
14
Burner relay switch Common (max. 230V AC
8A)
15
Burner relay switch Normally Open (max.
230V AC 8A)
16
PDS-C (Common) pressure differential switch
17
PDS-NC (Normally Closed) pressure differen-
tial switch
18
PDS-NO (Normally Open) pressure differential
switch
19
Chimney fan L1
20
Chimney fan Nreg
21
Chimney fan PE
22
XTP 0V supply (pressure transducer)
23
XTP 24V supply (pressure transducer)
24
XTP 0-10V signal (pressure transducer)
25
Control signal 0V
26
Control signal 0-10V
6
