Two-Stage Burner Control With Two Solenoid Valves - Honeywell krom schroeder IFD 258 Manual

7 .16 Two-stage burner control with two
solenoid valves
The IFD is equipped with two signalling contacts for
operating and fault signals. For controlling two-stage
burners, a bridge must be installed in the lower section of the
housing between terminals 12 and 13. Valve V2 is connected
to terminal 14.
1 2 3 4 5 6 7 8 9 10 11 12 13 14

Z
I
Program sequence
04
01
t W t Z
t SA
During the waiting time t
W
made for flame simulation and fail-safe operation. If no flame
simulation is detected, the IFD 258 opens the
IFD 258 · Edition 03.12l
s2 v1 v2
c
max.
max. 2 A,
2 A,
253 V AC
253 V AC
L1 (L1)
N (L2)
PE
88
1
L1

3
10
11
V1
5
14 V2
8-9
t
after heat demand, checks are
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gas valve V1 and ignites the burner. The ignition time t
constant. The safety time t
tion time t . If a flame is detected during the safety time, the
Z
operation signalling contact closes and valve 2 is opened once
the safety time t has elapsed.
SA
If no flame is detected, the fault signalling contact clos- es
once the safety time t has elapsed.
SA
Example of application
Control: ON/OFF or ON/HIGH/LOW/OFF
The burner BIO/BIC starts at low-fire rate. Once the normal
operating state is reached, the automatic burn- er control unit
IFD 258 opens the air valve. The burner switches to high-fire
operation.
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starts with the igni-
SA
IFD 258
8
9
µC
13
14
10 5
BIO/
BIC
is
Z
32