44 ซ.บรมราชชนนี 70 ถ.บรมราชชนนี ศาลาธรรมสพน์ ทวีวัฒนา กทม. 10170.
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V
2
Parameter 14
This indicates the safety time during operation t
SB
for valves V1 and V2. The default in accordance with
EN 298 is 1 s. The IFD is also available with a safety
time during operation t
SB
of 2 s. Prolonging the time in-
creases the installation availability in the case of brief-
duration signal fades (e.g. fades of the flame signal).
In accordance with EN 746-2, the safety time of the
installation during operation (including closing time of
the valves) may not exceed 3 seconds (note the require-
ments of the Standards).
4
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4
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2
F
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Parameter 12
A switch on the underside of the upper section of the
housing determines whether the IFD starts a one-off
restart or performs an immediate fault lock-out for the
burner after a flame failure, see page 29 (Behaviour
in the event of flame failure).
Immediate fault lock-out following flame failure
Parameter 12 = 0,
Switch in fault lock-out position :
After a flame failure during operation, the IFD 258 will
perform a fault lock-out within the safety time during
operation t
SB
(the safety time during operation t
SB
is
1 second. The IFD 258 is available with a safety time
of 2 seconds upon request). At the same time, the gas
valve is closed. The fault signalling contact closes and
the display blinks and indicates
04
, see page 16
(Program status and fault messages).
After a fault lock-out, the IFD 258 can be reset, either
by using the button on the front panel or an external
button. Several automatic burner control units can be
reset in parallel using the external button. The IFD 258
cannot be reset by mains failure. The fault signalling
contact does, however, open as soon as the mains volt-
age fails.
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