Purge; Emergency Stop In The Event Of Fire Or Electric Shock; Emergency Stop Triggered By Safety Interlock; Overload Protection - Honeywell krom schroeder IFD 258 Manual

7 .3 Purge

In the case of multiple burner applications, burners
with forced air supply are used. The air for combustion
and pre-purge is supplied by a central fan controlled
by a separate logic. This logic determines the purging
time and controls an external relay that switches the air
valve to purge.
The automatic burner control unit must not be activat-
ed during purging. This is achieved by interrupting the
safety interlock, amongst other methods.
10
11
GIK..B
VAS
VR..R
7 .4 Emergency stop in the event of fire or
electric shock
If there is a risk of fire, electric shock or similar, inputs
L1, N and 3 (start-up/safety interlock signal) of the IFD
IFD 258 · Edition 03.12l
13
14
5
Purge
BIO/
BIC
N
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should be disconnected from the electrical power sup-
ply.
Important! This should be reflected in the wiring on
site!
7 .5 Emergency stop triggered by safety
interlock
The safety interlock turns off the power to the input 3
(start-up/safety interlock signal), such as in the event of
air deficiency or similar.

7 .6 Overload protection

To protect the unit against overload by frequent cycling,
only a specific number of start-up attempts can be car-
ried out by the IFD. The maximum number of start-up
attempts per minute depends on the safety time t
and the ignition unit.
t
t
SA
Z
[s] [s]
3 1.8
5 3
10 6
3 1.8
5 3
10 6
If too many start-up attempts are made,
the display to indicate a fault.
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SA
Type of ignition Cycle lock
[s]
External TZI 10
External TZI 12
External TZI 15
IFD..I 36
IFD..I 60
IFD..I 120
flashes on
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