MOTOROLA MVME712M Sequence control card

AN ACCEPTABLE SCANNER LOCATION MUST ENSURE THE FOLLOWING: — Reliable pilot flame detection. — Reliable main flame detection. 

— Rejection of pilot flame too short or in the wrong position to ignite the main flame reliably, thus prohibiting main fuel admission. Note: Reliable signals must be obtained at all air flows and furnace loads (ranges of fuel firing).

If combustion air enters the furnace with a rotational 

movement of sufficient velocity to deflect pilot flame in direction of rotation, position the scanner 0 to 30 degrees downstream of the pilot burner and close to the periphery of the throat where the ultraviolet radiation is at a maximum. (See Figures 3 and 4). Having determined an appropriate location for the sight tube, cut a clearance hole for a 2 inch pipe through the burner plate. If register vanes interfere with the desired line of sight, the interfering vane(s) should be trimmed to assure an unobstructed viewing path at all firing levels, see example shown below. Note: Always check with the burner manufacturer before you trim register vanes.

                                                                        

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