Furnace Issues

[ExtraSlow]

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Or downsize to eliminate need for two furnaces?

He just upsized this winter. Bigger is better yo!

[killramos]

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Or downsize to eliminate need for two furnaces?

That’s just crazy talk...

[rage2]

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I'm hoping my flame sensor is the issue I'm having as well....it will be blowing air but no heat, or it will turn on for a quick minute, then shut off and constantly keep doing that.

I miss those problems. 5 mins with sandpaper and back in business.

I don’t even know wtf an inducer is.

[speedog]

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I miss those problems. 5 mins with sandpaper and back in business.

I don’t even know wtf an inducer is.

It's a setting on the bidet you own and that you're not telling us about.

[ZenOps]

For quick reference a heating cycle for me is 9 minutes for 2 degrees F. Cycle happens every hour when at -30.

Its probably overcapacity, but I like the closer to hairdryer blast of heat. Finished plugging up all the airgaps around the exterior walls, including temporary cardboard door insert because my main door shrinks every year.

I do have two Delonghi oil filled 1500 watt electric backups, which keep things from freezing in case maintenance is needed, and to ensure nothing is ever an "emergency" call. I've noticed that they have slowly being going up in price over the years. If electricity was closer to 4 cents/kwh - I'd probably just dump the natgas.

[Darell_n]

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It's a setting on the bidet you own and that you're not telling us about.

It's the secretive prostate milking mode. The Inducer

[speedog]

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It's the secretive prostate milking mode. The Inducer

rage2 has all the best toys.

[ThePenIsMightier]

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...

Once it was cleared up, took a whopping 10 mins to gain 2 degrees back onto target. So I guess it's fixed for now. He suggests yearly maintenance to check on this shit. This ain't what I signed up for. Fucking high maintenance bullshit.

Yep. Modern furnaces seem to have made the jump from small block Chevy to Ferrari with an emphasis on the worst features. Thank Allah they save us __% on the lowest priced natural gas on earth!

Now I'm off to my high efficiency washing machine that takes 90 minutes to do a piss poor job of cleaning but only uses 2 cups of water. Water that costs $8/tonne...

[ExtraSlow]

I've always thought furnaces were way oversized. I know industrial machines operate most efficiently in steady-state modes, so why are home furnaces designed to run for ten minutes an hour?

I swear my house could be kept warm in - 40 weather by something with under 40,000 btu , but my furnace is rated to an output of 80,000 btu.

[Darell_n]

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I've always thought furnaces were way oversized. I know industrial machines operate most efficiently in steady-state modes, so why are home furnaces designed to run for ten minutes an hour?

I swear my house could be kept warm in - 40 weather by something with under 40,000 btu , but my furnace is rated to an output of 80,000 btu.

They are sized for worst case scenario. Open a window on Monday night and see how the runtime looks. Lol. I had my basement carpet installed 10 years ago at -20 outside and my furnace ran for 4 hrs non-stop, still could barely warm up enough to stretch the carpet. (material came through basement window)

[ExtraSlow]

I think I'll leave mine off for a few hours Sunday and then see how long it takes to warm up.
I don't pay close attention, but my house goes from 17.5 to 20.5 every morning pretty fast.

[Darell_n]

Looking at my Nest, it takes around 30-40 minutes to heat from 19 to 20°c when my schedule changes at 5am weekdays. 61,500 btu output in 1100 sqft bungalow.

[Cash Money Hoes]

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I've always thought furnaces were way oversized. I know industrial machines operate most efficiently in steady-state modes, so why are home furnaces designed to run for ten minutes an hour?

I swear my house could be kept warm in - 40 weather by something with under 40,000 btu , but my furnace is rated to an output of 80,000 btu.

This is the logic behind newer modulating gas valve furnaces which can run at lower outputs. They're designed to match Btuh output with heat loss in home. More consistent temperature distribution through home and overall less energy consumption.

[rage2]

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Looking at my Nest, it takes around 30-40 minutes to heat from 19 to 20°c when my schedule changes at 5am weekdays. 61,500 btu output in 1100 sqft bungalow.

10 mins for 1C here.

In other news, temps are stable now at the house.

[benyl]

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Can confirm. 2 Lennox here, double trouble.

Yup, replace furnace fan motor number 1 Christmas 2018, and then number 2 Christmas 2019. $1,500 each. Love Christmas furnace maintenance.

[Maxt]

The modulation helps with the sizing problems as well, on top of that, most of the problems with modern furnaces occur during the ignition sequence, keeping the burner lit for long periods of time reduces the chance of that by reducing ignition events.

[ExtraSlow]

Love these cold air temps. I have some serious frosting happening on the cold air intake, and I assume that's why my floor around the furnace is soaked. Note this is not the combustion air intake, but one that ties into my cold air return line.

[sabad66]

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Can confirm. 2 Lennox here, double trouble.

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Yup, replace furnace fan motor number 1 Christmas 2018, and then number 2 Christmas 2019. $1,500 each. Love Christmas furnace maintenance.

At least if you have two you're never without a working furnace in the house and buys you time if you want to take your time and order the part/install it yourself instead of paying for an emergency service call.

[Darell_n]

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Love these cold air temps. I have some serious frosting happening on the cold air intake, and I assume that's why my floor around the furnace is soaked. Note this is not the combustion air intake, but one that ties into my cold air return line.

Looks similar to mine. You can close it off completely to increase humidity in your house, or open it more to lower the humidity. Note: the flap inside is probably cut off so you can’t close it completely. They are less than $2 at Home Depot.

The low spot in the flex duct probably has a gallon of water or ice in it.

[suntan]

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At least if you have two you're never without a working furnace in the house and buys you time if you want to take your time and order the part/install it yourself instead of paying for an emergency service call.

That's why you should have three furnaces for true redundancy/failover protection.