Specifications

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3002443 04.14
5. Start-up and Conguration
5.1 System Testing
Before any adjustments are made to the system, follow these procedures:
1. Turn the 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.
2. Turn the fan OFF and make sure the pressure switch opens, so the power to the circuit, it controls, is disconnected.
DANGER
Check other heating appliances (water heater, furnace, fireplace etc.) for proper operation while
the ventilator is operating. Make sure no flue gases are spilling out as this can lead to carbon
monoxide poisoning.
5.2 Adjusting the Fan Speed
Start up all appliances. Use the fan speed control to set the speed of the ventilator 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 Proven Draft 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 set 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 opens. Return the fan speed to the original setting marked on the cover.
The system is now adjusted so the flue gas spillage will disconnect the heating appliance(s).
The procedure described here may not cover all Proven Draft Switches, so please review the Installation Manual for
the switch being used.