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Have an american standard freedom 90 furnace model number…

Customer Question
Have an american standard...

Have an american standard freedom 90 furnace model number AUC080942B2 when we turn on the furnace the glow plug turns on and lights the burners but then the glow plug gets really hot with flames going to the the roof of the metal roof and burning the tube fron the exhaust motor

Contractor's Assistant: Have you talked to a roofing professional yet?

Oops sorry i meant the metal box surrounding the burners

Contractor's Assistant: Do you plan on doing the work yourself?

Yes if possible

Contractor's Assistant: Anything else we should know to help you best?

The blower motor comes on and everything else seems to be working fine

Submitted: 6 months ago.Category: HVAC
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Answered in 2 minutes by:
12/19/2017
HVAC Technician: airheatman, HVAC Technician replied 6 months ago
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 9,175
Experience: Furnace, A/C and heat pump specialist.
Verified

Sounds like we may have a gas pressure issue or a bad valve.Do you have a manometer to check gas pressure in and out of valve? Id this a new installation or just started this?

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Customer reply replied 6 months ago
no we do not but may b able to get one this furnace is about 10 years olsd and just did this in the last couple of days
HVAC Technician: airheatman, HVAC Technician replied 6 months ago

Can you post a pic or video showing me the flame?

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Customer reply replied 6 months ago
i cant post a picture as of today as i am not there tomorrow i wi
ould be able to aroung 4pm central time what should the gas pressure be ? we dont have a manual for this so we donot know specs on it
Customer reply replied 6 months ago
we did notice that the exhaust tube had alot of black residue on the ground
Customer reply replied 6 months ago
did we get disconnected
HVAC Technician: airheatman, HVAC Technician replied 6 months ago

If natural gas 5 to5"wc in and 3.5"wc out of valve.

If propane 11 to 14in wc in and 7.5 out

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