B&R ECPE84-2 Channel contact module

Once the low fire start switch is detected as closed, terminal 6 is energized to open the pilot valve. A 20 second time delay is then imposed with both the main valve (7) and pilot valve (6) energized. The display will indicate: HOLD T16 42 while in AUTO, M-D detected closed M-D LOW LIMIT wait 20 seconds in this state At the end of the 20 seconds, the main valve (7) is de-energized and the ignition terminal (5) is energized for the time specified in PTFI*MTFI TIMINGS. Terminal W is energized for 5 seconds.

Unlike PTFI, this period is a flame proven state

if flame signal is lost for one FFRT, the system will shutdown and lockout. At the end of the selected PTFI time, terminal 5 is de-energized and the system proceeds to the pilot proving period with terminal 6 energized and flame being proven.Once terminal 16 is de-energized, the system proceeds into the MTFI period with terminal 7 (main valve energized). If selected to be on, terminal 5 with the ignitor will become energized during MTFI in accordance with the PTFI*MTFI TIMINGS selection. At the conclusion of the MTFI period and as selected by PTFI*MTFI TIMINGS selection and terminal 6 as interrupted/intermittent, terminals 5 and 6 assume their respective states.

Common problem

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