Honeywell krom schroeder IFD 258-5/1W - Two-stage burner control with two solenoid valves

IFD 258 · Edition 03.12l
32
44 ซ.บรมราชชนนี 70 ถ.บรมราชชนนี ศาลาธรรมสพน์ ทวีวัฒนา กทม. 10170.
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7 . 16 T w o - s t age bu r ne r c on t r ol w i t h t w o
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.
gas valve V1 and ignites the burner. The ignition time t
Z
is
constant. The safety time t
SA
starts with the igni-
tion time t
Z
. If a flame is detected during the safety time, the
operation signalling contact closes and valve 2 is opened once
the safety time t
SA
has elapsed.
If no flame is detected, the fault signalling contact clos- es
once the safety time t
SA
has elapsed.
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.
Program sequence
During the waiting time t
W
after heat demand, checks are
made for flame simulation and fail-safe operation. If no flame
simulation is detected, the IFD 258 opens the
01
04
1
3
10
11
5
14
8-9
88
L1

V1
V2
t
W
t
Z
t
SA
t
s2
c
v1 v2
1 2 3 4 5 6 7 8 9 10 11 12 13 14
max.
max. 2 A,
253 V AC
2 A,
253
V AC
Z
I

L1 (L1)
N (L2)
PE
IFD 258
8
9
µC
13
14
12 11
10
5
GIK..B
VAS
BIO/
BIC
VR..R
230