B&R ECPE82-2 Channel output module

The YP118 and YP138 programmers offer burner operation similar to the YP100 programmer but with extended functions that might enhance burner operation such as increased turndown. The YP138 programmer makes use of additional inputs on terminals 16 and 21. Both terminals 16 (PILOT HOLD) and 21 (START INPUT) are line voltage inputs.All safety limit switches should be approved as limit controls and should be wired directly in the circuit of the Flame Safeguard control. The use of electronic switches to close interlock circuits may cause erratic operation.

Once terminal 16 is released or de-activated

the system then proceeds in the MTFI period in accordance with the PTFI*MTFI TIMINGS selection. If selected to be on, terminal 5 with the ignitor will become energized during MTFI. Terminal 16 is also used to revert the system back to the pilot proving mode from the AUTO or RUN mode. During AUTO, an active state on terminal 16 initiates the steps to revert back to pilot mode. On detection of terminal 16, the firing rate motor is commanded to the low fire position and the system waits for the low fire start switch (M-D) to close.

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