Specifications

12
3000270 05.12
5.Start-UpandConguration
5.1 System testing
Before any adjustments are made to the system, follow these procedures:
1. 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.
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,replaceetc.)forproperoperation
whilethechimneyfanisoperating.Makesurenouegasesarespillingoutasthiscanleadto
carbon monoxide poisoning.
5.2 Adjusting the Chimney Fan Speed
Start up all appliances. 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ue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ue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ue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.