BACHMANN ME203/CN Channel output card

During the MTFI period, switching to the Check position will stop the program in the MTFI period. At this point it may be useful to inspect the position of the main flame at the burner head. Depending on where the switch is placed in check and depending on the selection of PTFI*MTFI TIMING, terminals 5, 6 and 7 could be energized simultaneously. The control will display: If the unit is left in Check for longer than 2 minutes, the control will automatically advance to AUTO.

Switching from run to check 

during the burner on period will drive the modulator circuit to low fire (10-12 Closes). This allows for low fire fuel-air adjustments and holding the burner at low fire. Consult your boiler/burner instructions for low fire hold firing recommendations. WARNING: Before testing the control operation on the boiler, close the manual main shutoff fuel valve. Failure to do this may cause injury or property damage.

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