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5. System Start-Up
5.1 System testing
Before any adjustments are made to the system, follow these procedures:
• Turn the chimney fan ON and make sure that it is operating. Increase and decrease the speed
of the fan by adjusting the fan speed control to make sure it is operating properly.
• Turn the fan OFF and make sure the pressure switch opens, so the power to the circuit, it controls,
is disconnected.
Notice: Do not blow air into the tube going to the pressure switch as this may damage the
diaphragm.
5.2 Adjusting the Chimney Fan Speed
Start all appliances up. Use the fan speed control to set the speed of the chimney fan so no back
pressure is experienced anywhere in the system. Check the system for flue gas spillage. Mark this
setting on the fan speed control cover.
5.3 Adjusting the pressure switch setting
Remove the snap-on cover from the conduit enclosure by loosening its retaining screw. Turn the
slotted Adjustment Screw clockwise to raise the set point pressure and counter clockwise to lower
the set point.
Set the adjustment to its lowest position. With all appliances operating, reduce the speed of the fan
to the point, where the appliance(s) starts to spill flue gas. Increase the speed of the fan 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.
The system is now adjusted so flue gas spillage will disconnect the heating system.
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