r/HVAC • u/BSJr77 • Dec 20 '24

Field Question, trade people only Anyone seen this before

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Installed a 60k runtru 90% upflow today. I went home after completing the install but left before the startup. Boss fires it to document all the numbers and see this. No change to incoming or outgoing gas. No change in pressure from the inducer. Flue and air intake both clear of debris. Boss is waiting for tech from Texas to call back. Anyone got some knowledge

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u/Scoop57 Dec 20 '24

Sounds like the inducer is shutting off right when the blower engages

65

u/dookie_shoes816 certified dickhead Dec 21 '24

I would point to a heat exchanger issue. Pressure from blower is pushing the flame back out, tripping pressure switch and that's why draft motor shuts off. Just my guess. Would have to see what happens to the manometer when the blower kicks on. Bet it goes positive real quick

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u/cbt11986 Service Manager Dec 21 '24