Gas unit cycles on and off too rapidly

Rully_2

The laws of physics do not apply to me.

Rully_2

Combustion and AirFlow analysis

Thanks for the terminology. I will ask for a combustion and air flow analysis by name. I greatly appreciate all the wisdom from the contributors here. At the end of the day, I will get professional help, as you all suggest, but at least I'll be able to talk intelligently about the subject when he shows up. Thanks again.

brucewo1b

Laws

When you can't count on the law of physics you can usually count on Murphys Law.

B.S.

Kniggit

To adjust it you need a pressure gauge that reads in inches of water, often called a Manometer. They can be slightly costly depending on the quality you wish to buy. I would not recomend adjustment without a gauge, and if you do procure a gauge make sure every gas appliance is running at the same time you check the inlet pressure. If it is not at least 5 then call the gas company, and make sure that they check it with the all appliances running.

Mark Hunt

VERY GOOD RULLY!


They don't apply to me either!

Mark H

To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"

Rully_2

I'll make a call

One thing I don't mess with is gas. I'll work on electrical, plumbing, you name it, except for gas. I'll make a call and let an expert do that. Just out of curiosity, though, how do you adjust the pressure reaching the burners? Is there something in the furnace itself that allows for adjustment, or is it only possible for the whole house via the main regulator?

Unknown

There is an adjustment on the

gas valve but it should not be touched by anyone who is not also doing a combustion analysis when adjusting the pressure adjustment. It should also be monitored with a "U" gauge (manometer).

Rully

I guess it's hard to see

Interesting. What's it look like? I only see one screw on there that looks like it could be some sort of adjustment. It's right next to the word "vent". But it really doesn't seem to be an adjustment. It just seems like a screw that's holding something on. Also, I like that word - Manometer. Sounds like it would measure one's manliness.

jp_2

where are the PRO's?

well after reading about this 'dead horse' I find it interesting that no PRO asked the poster to actually measure temperatures?

so mark, I think this dead horse still needs a whippin cause nobody has yet to ask the basic questions!

seems everyone has assumed too much here.....

what are the temperatures taken right after the furnace? when the blower kicks on and off?

is it truely cooling off that fast or WE just assuming it does? if it take several minutes to heat I question if it can cool in several seconds.

Kniggit

didn't I mention a measurement of return temp in my reallly long post? But I did not specificaly ask him to give that info, a return air temperature as close as practical to furnace and a supply temp above the A-coil should help us truely troubleshoot this Vat of glue

jp_2

long post, yes long post....

""" The blower is cycling to prevent the heat exchanger from getting to cold, condensing, and rusting out prematurely."""

if this is the case, you could never have a cold start condition because the blower would never run.... beside how can you get condensing on a warm surface or a surface the same temp as the surround air? sorry but you can not!

I have run my furnace from cold starts below 30F, blower runs non stop.