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Old 09-30-2009, 10:59 PM   #1
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10 year old Carrier mid furnace with standing pilot


My son has a 10 year old Carrier mid furnace with a standing pilot. No parts book available. It has AC. Water dripped from the A frame and rusted the burners and clogged the pilot. I'm a licensed gasfitter. I cleaned the burners and put CLR in the pilot. Now the pilot works but it's still restricted. I replaced the thermocouple. It's working now, however the pilot isn't strong. What's the orifice size of this pilot? I'll drill it out to totally remove the obstruction.

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Old 10-01-2009, 01:20 PM   #2
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10 year old Carrier mid furnace with standing pilot


I don't know of any carrier furnace that had been made with a standing pilot within the last ten years. I would have to guess it has a three wire pilot assembly/switch. If you had to pour clr into the pilot to clean it, I would recommend replacing the pilot.

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Old 10-01-2009, 06:43 PM   #3
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10 year old Carrier mid furnace with standing pilot


Can you let me know what else i can check on my carrier furnace, that's not staying on. I have clean the flame sensor and the glow coil working fine, but after 60 seconds the flame blows out and the valves never get heated
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Old 10-01-2009, 07:16 PM   #4
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10 year old Carrier mid furnace with standing pilot


Skip, Carrier made a cheap builders grade GFA mid unit with a standing pilot. (And a Payne and Bryant clone). For $2 more it could have had a HSI, go figure.

Bryan that orifice is ultra tiny as it is a micropilot type burner and obsolete. Not sure what the size was. It is usually stamped on the side of the orifice and you may see it with a strong magnifying glass.

Last edited by yuri; 10-01-2009 at 07:21 PM.
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