Adjusting the Fan Proving Switch
setting.
Before any adjustments are made, turn ON the
chimney fan and make sure it is operating.
Turn the fan OFF and make sure the pressure
switch opens, so the power to the circuit, it controls, is
disconnected.
Start the gas-fireplace. Use the motor speed
control to set the speed of the chimney fan, so no
spillage (back pressure) is experienced. Mark this
setting on the motor speed control cover.
Remove the snap cover from the conduit enclo-
sure by loosening its retaining screws. Turn the slotted
adjustment screw clockwise to raise the set point and
counter clockwise to lower the set point.
Set the adjustment screw to its lowest position.
With the gas-fireplace/gas logs operating, reduce the
speed of the chimney fan to the point where the
fireplace starts to spill gas or flue gas from the top of the
opening. Increase the speed gradually to the point
where there is no more spillage. Raise the switch's set
point so it just opens. Return the fan speed to the
original setting marked on the cover.
18
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