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2.2.1 Connection examples
The controls can be connected to a voltage signal as
well as a voltage free set of contacts - see connection
example 1 or 2. It is recommended to contact the
boiler manufacturer to ensure correct connections to
the boiler automatic control unit.
Connection example 3 shows an EBC12 connected
to a separate pressure differential switch (PDS).
When the pressure differential switch has been con-
nected, the boiler system has doubled its draught fail-
safe function (the pressure differential switch is an
accessory).
Connection example 4 shows continuous operation of
the chimney fan.
2.2.2 Example 1 - Voltage signal (fig. 5)
The example shows how a voltage signal (10-230V
AC/DC) from the boiler control is connected to the
EBC12.
•
Connect the power supply to terminals 1-3.
•
Connection to the boiler automatic:
• Connect the burner start signal (L) to termi-
nal 6.
• Loop terminals 7 and 14.
• The start signal to the burner will now come
on terminal 15.
• Connect Neutral to terminal 4.
•
Connect the chimney fan to terminals 19-21.
•
Connect the pressure transducer (XTP) to
terminals 22-24.
Terminals (fig. 5)
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
5
