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Engineering notes
13 12 14
1
2
21
3
W
bv...
SB
(1)/(3)
EK2
H
Si
AL
LP
L
N
2
1
Connect safety limit thermostat in the line (manual reset, e.g. «SB»)
Remote reset
When remote reset button «EK2» is connected between terminal 21 and
- terminal 3, only remote reset is possible
- terminal 1, both remote emergency shutdown and remote reset are possible
Required switching capacities
- of the switching devices connected between terminals 12 and 4 (refer to «Technical data»)
- of the switching devices connected between terminals 4 and 14 (refer to «Technical data»)
- depending on the loads applied to terminals 16...19 (refer to «Technical data»)
Air pressure supervision
If the air pressure is not monitored with air pressure switch «LP», terminal 4 must be connected to terminal 12, and terminal 6
to terminal 14. Terminal 13 is not used.
Control contacts of the other devices in the burner installation – if series-connected – are to be connected as follows:
- To terminal 4 or 5 contacts which must be closed from startup to controlled shutdown otherwise no start or shutdown
- To terminal 12 contacts which must only be closed on startup otherwise no start
- To terminal 14 contacts which must be closed at the beginning of the preignition time at the latest, and which must stay
closed until controlled shutdown occurs
For use in oil applications, the oil supply must be equipped with two shutoff valves connected in
series.
Observe the following:
EN 298:2012, Section 7.101.3.3 Prepurge time for oil burner control systems and the corresponding
application standards.
Connection of fuel valves with
Connection of fuel valves with interrupted pilot burners
Direct connection of a fuel valve to terminal 20 is only permitted
in plants with a main shutoff valve on the mains side (safety shutoff valve), which is controlled by terminal 18 or 19, and
-
if 2-stage valves are used, provided they fully close when the first stage, controlled by terminal 18 or 19, is switched off
-
For additional examples of air damper control, refer to «Connection examples». In the case of actuators with no end switch
«z» for the fully CLOSED position of the air damper, terminal 11 must be connected to terminal 10 otherwise no burner
start.
Simultaneous use of ionization and UV supervision is possible
For the permissible length and laying of detector cables, see Flame supervision
4/25
Building Technologies Division
Install switches, fuses, earthing, etc., in compliance with local regulations
Decisive for the connection of the valves and other plant components is the plant
diagram provided by the burner manufacturer
4
5
6
7
16
d1
d2
GP
R
N
N
M1
M2
Z
3
4
direct spark
flame burners. With 2-stage burners, «BV2» is connected in place of «BV3»
17
18
19
LR
SA
BV1
BV2
LK
ZBV
BV1
BV2
7451a14e/0604
5
9
8
22 23
20
11
10
+
QRA...
v
a
z
m
M
22 23
TSA´, t3´, t4´, only:
BV3
LFL1.335,
LFL1.635 and
LFL1.638
6
7
CC1N7451en
20.11.2017
24
24
ION
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