How to Plumb a Harman VF3000 Boiler

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Sting
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Joined: Mon. Feb. 25, 2008 4:24 pm
Other Heating: OBSO Lennox Pulse "Air Scorcher" burning NG
Location: Lower Fox Valley = Wisconsin

Post Tue. Jan. 03, 2012 10:21 am

let me not step on Gregs thread here --- but its better to have it fail open -

if it was failing to open - the appliance should never fire as the proof of draft would also fail

There are lots of these sort of permanently / accidentally "stuck" open. many are only installed with other upgrades, to meet NG providers standards of conservation in equipment - others are installed as simply a good idea - until they don't work. Every upgrade nets extra installer profit also.

I know Greg will be around - but if I may the damper functions when it receives a call that the appliance wants to awake to for hi fire. This signal in interrupted, ( by the closed damper) until the damper motor gets the door fully open and sometimes draft is proven also. Then - after the draft is flowing, the signal is allowed to excite the burner - and the appliance should spring to action.

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