Carrier gas furnace: diagnosing/replacing inducer fan

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Old 01-02-16, 08:09 PM
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Carrier gas furnace: diagnosing/replacing inducer fan

Hi Guys, Happy New Year. Conveniently enough our furnace is caput during our coldest streak this season. Anyone got any advice on this?

Carrier Super Saver Natural Gas Furnace model 58SSB060-CC

The draft inducer fan is not turning. When the t-stat calls for heat you can hear humming like the motor wants to spin but doesn’t. With the power off the fan is difficult to rotate manually with a screwdriver through the cage. Most electric fans I have seen will spin easily with the power off. Does this mean a bearing has seized? If this is the case what is involved in replacement and how are these sourced?

The pilot light fires quickly and occasionally the fan will go. When this happens the furnace will light and produce heat for some time until the next time the t-stat calls for heat. The flame is nice and blue when burning.

What are my options?
 
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Old 01-02-16, 08:24 PM
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Welcome to the forums.

What you are describing is the draft inducer blower. If it doesn't start up and run.... there can be NO burner activity.

You can replace the motor. Is it a fairly common and basic repair.
Carrier Bryant Draft Inducer Motor 321373712 321373-712 - North America Heating


Replacing the motor requires disassembling the inducer assembly and removing the blower from the motor shaft. Some people opt for the entire kit so that there are no surprises.
Carrier Furnace Draft Inducer Kit
 
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Old 01-02-16, 08:25 PM
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This is the fan in question.
 
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Old 01-02-16, 08:33 PM
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Yes.... that is the draft inducer blower.
 
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Old 01-02-16, 08:34 PM
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Thank you very much. That was my assumption. Should it turn freely and if it does not am I correct in replacing it? It does hum and seems to be getting power.

The replacement inducer blower motor you linked is different looking. Will it bolt in the same? Are the connectors matching? Do you know of any basic guidelines for installation?
 
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Old 01-02-16, 08:42 PM
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Post a picture of just the inducer. The cooling fan may just be different.

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Old 01-02-16, 08:53 PM
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Do the bearings seize?

Here's the label. 3300 rpm etc.
 
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Old 01-02-16, 08:59 PM
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The Carrier part number is HC23UZ120.

All the kits I listed will work..... including this one from Amazon.
amazon/HC23UZ120-Carrier-Aftermarket-Inducer-Exhaust/dp/B00NWVH3V8
 
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Old 01-02-16, 09:23 PM
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Very good then. Your help is appreciated. So many cross references and supersedings. It really helps to know what will fit.

Can I be reasonably confident that my unit has failed given that the blade does not turn easily by hand? If so I will pursue replacement.
 
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Old 01-02-16, 09:33 PM
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Those motors run under extreme heat and the front bearing..... towards the furnace seizes.
Some people try lubricating the motor. Unfortunately that is only a short term repair.
 
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Old 01-03-16, 03:04 PM
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Greets all.

I removed the assembly and lubed the motor. It improved rotation but not enough to spin under its own power so I plan to replace it. It looks like the squirrel fan that runs inside the draft/exhaust duct and the small fan seen in the photos need to be removed. How is this done? There is an allen set screw in a collar that looks to be securing the squirrel fan. It is not letting go easily. Is this the one that needs to be done to get it off?
 
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Old 01-03-16, 03:54 PM
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The blower wheel will need to be removed. Remove the Allen key completely. Use Liquid Wrench or PB Blaster sprayed on both side of blower wheel as well as in key opening to aid in loosening the wheel.
 
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Old 01-03-16, 04:31 PM
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Thanks Pete. PB blaster applied and soaking the blower wheel side as we speak for a go later tonight.

What holds the small fan on?
 
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Old 01-03-16, 06:01 PM
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I believe it's just a pressure fit.
 
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Old 01-04-16, 01:33 PM
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In my experience, it's a waste of time to try to get the inducer fan wheel off the motor shaft. It's usually corroded on and about impossible to get off.

Most manufacturers provide an inducer fan "kit" that includes a new motor, fan wheel and the part needed to bolt the assembly on the furnace, along with any new gaskets needed.

That's worth a few extra dollars, in my opinion.

The parts come assembled and ready to bolt back on to the furnace.
 
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