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Thanks guys, I had a pro check it out. The furnace is working fine. He found too much air restriction on the return side, and corrected it. There was too much of a temperature difference between the cold return and the hot side. The heat exchanger was fine.
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It's unlikely that going from a larger pipe to a smaller pipe (which is essentially what the flex hose is) would cause that. However, the repair man may have meant that the flex hose was undersized for the gas line inside the furnace, which would make more sense. Expanding flow could certainly cause the noise, but to really figure out what's causing it you'...
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The catch about these new units is that they are sometimes condensing units. I had two installed. One has a direct feed to the drain, while the other has a pump that pipes it to the same place. We had a super-hard freeze (uncommon where I live) and the pump line froze up. That, in turn, tripped the failsafe switch, which cut power to the unit (required by ...
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Another consideration is installing the unit on vibration isolators. When the fan turns on, it will cause the unit to move (slightly). Likewise, when it’s running, the fan will cause some vibration in the unit. Make sure the unit is isolated from the framing.
I prefer hanging the unit from the roof rafters rather than sitting it on the ceiling framing. ...
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Since you have some space in your attic, and you seem set on installing the furnace up there, I think it would be easy enough to make a small room just for the furnace. I did that in our new addition, as the dedicated furnace for the addition was an afterthought after running ductwork over from the original furnace location turned out to be impractical. We ...
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Yes you can put a high efficiency furnace in an attic hose if allowed by your local code. I use self regulating heat tape if there is any chance of the condensate line freezing.
Have you considered a mini split system? I have installed high efficiency furnaces in attics in the past but you would still need a separate compressor unit outside for AC.
The ...
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I wanted to share the additional steps I took to troubleshoot the issue and describe what was ultimately causing the issue. The problem comes down to a weak and short spark. I was able to test the spark and witness that it was very quick and dim. I replaced the transformer and the protector relay. I likely did not have to replace the protector relay but ...
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The water vapor is slightly acidic but not enough to damage plant life in my experience. At 20’ horizontal and then 7-8’ up the carbon monoxide should be well diluted but this is probably what you notice,
almost all of the systems I have installed exhaust to the roof the one that was in a wall was at 9’ , but that may be a requirement for my area as it ...
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Dangerous! Don't pull LO FAN plug, it dissipate the heat.
Sounds like LO FAN relay stuck, better replace the whole (blower control) board.
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