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T-Product · BCU 465 · 2006 April
Factory Options and Field
Programmable Options
Factory Options
Control Input for Proof of Clo-
sure Switch (POC);
Parameter 09
For applications with more than
400,000 BTU/h (117 kW) NFPA 86
2003 edition standard requires two
safety shutoff valves in series, with
one valve including a proof of clo-
sure.
In that situation, order BCU
465 with Parameter 09 set to 1
(BCU 465..O).
This ensures proper proof of closure
during standby and also proves that
the contact is open during start-up
and operation.
Flame Failure Response Time;
Parameter 14
The flame failure response time is 2
seconds.
This is the amount of time the gas
valves remain open in case of flame
loss before a safety shutdown ap-
plies.
Safety Period on Start-up; Pa-
rameter 22
The trial for ignition / safety period
on start-up can be 5 seconds or 10
seconds.
This is the maximum time the gas
valves may remain open without a
flame signal during start-up until a
safety shutdown applies.
Digital Input as 1400°F Auto
Ignition Flame Management
Bypass, Parameter 33
If the “D1” input is used, parameter
33 must be configured for desired
operation of the BCU.
If parameter 33 = 0, the input is not
used.
If parameter 33 = 2, the BCU will shut
down the burner and restart when
the high temperature operation has
ended. This is recommended if UV
flame detection devices are used.
If parameter 33 = 3, the BCU will
continue normal operation after the
process temperature drops below
the auto ignition temperature. The
flame signal will now be monitored.
This is recommended if flame rods
are used.
