Patterson-Kelley Thermific Installation & Owner's Manual page 22

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Thermific Gas-Fired Boiler
ther end of the damper rod to obtain the desired Hi
fire air. After adjustments are complete, adjust the
Hi fire definite stop screw until it touches the defi-
nite stop and lock it with the nut.
Note: Do not utilize the Hi fire definite stop screw to
adjust Hi fire air on Lo-Hi-Lo models.
Lo fire adjustments are made with the valve actuator in
the Lo fire position. Use the left hand screw on the
definite stop bracket to obtain desired Lo fire air and
lock it with the nut.
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Installation