Honeywell BCU 465 - Safety Time During Operation

BCU 460, BCU 465 · Edition 11.19 88
Parameters
11.7.2 Safety time during operation
Parameter A019
Parameter A019 = 0; 1; 2; 3; 4: time in seconds
The safety time during operation is the time that the
BCU needs to stop the fuel supply after a flame failure
during operation or an interruption at the safety current
inputs (terminals 36, 37 and38). The safety time can
be set to between 0 and 4s in steps of 1s. Prolonging
the safety time during operation increases the instal-
lation availability in the case of brief-duration signal
fades (e.g. fades of the flame signal).
The requirements of national standards and regula-
tions must be satisfied.
In accordance with EN298, the maximum reaction
time to a flame failure must not exceed 1s. Specific ap-
plication standards may permit other values.
In accordance with EN746-2, the safety time of the in-
stallation during operation (total closing time) must not
exceed 3s.
Under NFPA86, section 8.10.3*, the maximum flame
failure response time shall be ≤4s.