Adjustments
4-10
750-204
Profire D/LND
rate. Driving and driven levers are approximately parallel, but the angles can be adjusted to vary the rate of
change. The most rapid rod travel occurs when the lever is perpendicular to the rod. The closer the rod comes to
being parallel with the lever, the slower the rod moves. Always allow the burner to return to low fire position
before adjusting high or intermediate settings. Do not alter low fire settings. Normally, the air control damper will
be approximately 1” open in low fire position. Excessive opening in low fire can cause pilot ignition problems. Air
to the pilot is supplied under pressure to compensate for variations in furnace pressure, but the damper must be
in low fire position for reliable ignition.
FIGURE 4-6. Firing Rate Control Adjustments
Keep fingers away from the air intake below the damper. The damper is actuated with sufficient force to cause seri-
ous injury.
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