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Form 6104 BCF23-R05
Standby
Trial for
Trial for
ignition
Lockout
RecycleRun
3 4
Ignition
carryover
Motor-off
delay
(postpurge)
8
6
7
5
Valve-on
delay
2
1
Sequence of operation
— typical
Install the burner and all wiring in accordance with the National
Electrical Code and all applicable local codes or requirements.
Wire the burner in compliance with all instructions provided by
the appliance manufacturer. Verify operation of all controls in
accordance with the appliance manufacturer’s guidelines.
S
equence of operation — typical
1. Standby — The burner is idle, waiting for a call for heat.
When a call for heat is initiated, there is a 3- to 10-second
delay while the control performs a safe start check.
2. Valve-on delay — As applicable, the ignition and motor are
turned on for a 15-second prepurge.
3. Trial for ignition (TFI) — The fuel valve is opened, as
applicable. A fl ame should be established within the 15-second
lockout time (30-second lockout time is available).
4. Lockout — If fl ame is not sensed by the end of the TFI, the
control shuts down on safety lockout and must be manually
reset. If the control locks out three times in a row, the control
enters restricted lockout. Call a qualifi ed service technician.
5. Ignition carryover — Once fl ame is established, the ignition
remains on for 10 seconds to ensure fl ame stability. It then
turns off.
6. Run — The burner runs until the call for heat is satisfi ed. The
burner is then sent to burner motor-off delay, as applicable,
or it is shut down and sent to standby.
7. Recycle — If the fl ame is lost while the burner is fi ring, the
control shuts down the burner, enters a 60-second recycle
delay, and then repeats the ignition steps outlined above. If
the fl ame is lost three times in a row, the control locks out to
prevent continuous cycling with repetitious fl ame loss caused
by poor combustion.
8. Burner motor-off delay — If applicable, the fuel valve
is closed and the burner motor is kept on for the selected
postpurge time before the control returns the burner to
standby.