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airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 7742
Experience:  Furnace, A/C and heat pump specialist.
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On a 2011 ruud idm runs all the time Seems to be pumping

Customer Question

On a 2011 ruud idm runs all the time
Seems to be pumping most of the heat out of the roof all burners light up blue flame
Both lights on solid flame and ok
Submitted: 1 year ago.
Category: HVAC
Expert:  airheatman replied 1 year ago.

Inducer should run non stop anytime thermostat calls for heat.

Customer: replied 1 year ago.
On the diag tree on the panel said it should shut down 30 to 45 seconds after burners light and main blower comes on and gives a list of potential problems
Expert:  airheatman replied 1 year ago.

Not sure what you are looking at.The inducer is never to shut down once thermostat calls for heat until thermostat is satisfied. Its purpose is to assist in removing the exhaust from furnace and keep pressure switch closed. If inducer stops, the pressure switch will automatically open shutting down the burners.

Customer: replied 1 year ago.
Ok than my burners are all lit and there is no heat in the house blower is blowing strong the AV works great the air out of the vents on heat is only 3-4 degrees higher than the room temp the air out the roof is much warmer
Customer: replied 1 year ago.
Ac not av
Expert:  airheatman replied 1 year ago.

One quick thing to do is make sure outdoor unit is not running (AC and heat at same time)

Customer: replied 1 year ago.
Ok will check and get back
Expert:  airheatman replied 1 year ago.

Let me know.I have seen this happen and heat is fighting ac

Customer: replied 1 year ago.
Out side unit is not running
Expert:  airheatman replied 1 year ago.

Ok next Is there any broken or damaged ductwork that would allow outdoor air in or for our heated air to escape?

Customer: replied 1 year ago.
Duct work good checked last week and just now
Expert:  airheatman replied 1 year ago.

Can you take a temp at return and the right at top of furnace to see what our rise is?

Customer: replied 1 year ago.
What do you mean at top
Customer: replied 1 year ago.
Return air is 67 exit air is 71
Customer: replied 1 year ago.
98 at draft pipe
Expert:  airheatman replied 1 year ago.

OK this sounds like you may have a gas pressure issue.We should have at least 25 degree rise and the exhaust should be at least 130. Do you have a manometer or gas pressure gauge to check pressure in and out of valve?

Customer: replied 1 year ago.
Not on hand but may be able to come up with one
The flame would still burn blue with a pressure problem?
Customer: replied 1 year ago.
It is propane from a tank outside
And there is a sticker saying the valve has been converted
Expert:  airheatman replied 1 year ago.

It may burn but not hot enough if say valve is allowing say 5"" WC pressure through. Are you able t load a video of burners when on? The flame should be shooting well into the heat exchanger.See beginning of this video.

https://www.youtube.com/watch?v=fMR9RsGi264

Customer: replied 1 year ago.
Ok I will check it out and come up with some tools
What should the pressure be
Expert:  airheatman replied 1 year ago.

With LP gas we should have around 14"WC going into valve and about 10.5 coming out. lets check that and go from her.

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