Is My 27 Year Old Furnace & A/C In Need Of Replacement? - HVAC - DIY Chatroom Home Improvement Forum


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Old 06-19-2012, 08:24 AM   #1
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Is my 27 year old furnace & A/C in need of replacement?


Hi - I have an Bryant furnace (Model 395BAW036095) and A/C unit that was installed in 1985. In the past, both have worked OK. Within the last few days, when the thermostat signals to turn the A/C on, blower motor doesn't "blow", but I hear a loud hum. If I turn everything off, and back on, the same hum happens. If I power everything off and let it sit for 30 or so minutes, when I turn it back on, the blower motor functions as it should (however I notice that when the blower motor turns on, i hear a humming noise for 3-5 seconds, then the blower motor kicks on - it never used to hum before it kicked on).

I guess my question is, is it worth throwing $ into this furnace being that it is almost 30 years old? I know that it must be very ineffecient, and I really can't expect it to last too much longer. I live in the Chiacgo area, so AC in the summer and heat in the winter are a must.

Also, what is the going rate for a "middle of the road" furnace and A/C install?

Thanks!

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Old 06-19-2012, 08:53 AM   #2
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Is my 27 year old furnace & A/C in need of replacement?


If all you need to do is replace the blower motor or Cap go for it, until you find the unit you want. No need to be without during the peak of the cooling months, or if you do not have the funds or need right now.

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Old 06-19-2012, 08:53 AM   #3
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Is my 27 year old furnace & A/C in need of replacement?


Hum from the inside is most likely a $10-$15 run capacitor. If you want to know how to check that, you'd need a meter or you can simply remove the existing one, take it with you to Grainger and buy the exact same one. By your description of the problem, that's most likely the problem.

If you were to purchase a new 410-A 14 seer system your electric bill would drop near in half. Spend money to save money. Return on investment, depending on how much you use the a/c, 3-5 years. Much more comfortable instantly.

27 years ago is light years away from the amount of energy (electricity) systems use today, today being far less.
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Old 06-19-2012, 08:55 AM   #4
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Is my 27 year old furnace & A/C in need of replacement?


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Originally Posted by gregzoll View Post
If all you need to do is replace the blower motor or Cap go for it, until you find the unit you want. No need to be without during the peak of the cooling months, or if you do not have the funds or need right now.

Good morning, Greg.
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Old 06-19-2012, 09:12 AM   #5
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Is my 27 year old furnace & A/C in need of replacement?


Thanks so much for the replies! I would like to try to replace the capacitor - I have been looking online but can't seem to figure out which one I need. Is there a way to determine which one I need BEFORE I tear into it? I would like to have it in-hand before I take the old one out (I have an elderly person living with us and don't want the indoor temps to get too high).

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Old 06-19-2012, 10:15 AM   #6
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Is my 27 year old furnace & A/C in need of replacement?


Post furnace make, model and serial number. While you're in the unit just take a look at the cap. Should be mounted on blower housing. Get the numbers from cap.
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Old 06-19-2012, 11:58 AM   #7
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Is my 27 year old furnace & A/C in need of replacement?


Thanks....i already have the model and serials:
Bryant Model # 395BAW036095
Serial# 468BC25066

Thanks!!!
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Old 06-19-2012, 12:01 PM   #8
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Is my 27 year old furnace & A/C in need of replacement?


Give me a second, I'll call Carrier. (Carrier is the parent company of Bryant)
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Old 06-19-2012, 12:10 PM   #9
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Is my 27 year old furnace & A/C in need of replacement?


5 uf. Get a new 5/370 or 5/440 cap as a replacement.

That unit is a 1998 or 1999, so not 27 years old.
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Old 06-19-2012, 02:43 PM   #10
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Is my 27 year old furnace & A/C in need of replacement?


You are the MAN Doc!!! Thanks for this info. 1985 was stamped on the panel where I found the model and serial numbers, so I assumed that this was a production date. I say I keep this old girl going!!!

Thanks again for your help! I am sure I will be with ?s regarding replacing the cap.
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Old 06-19-2012, 03:16 PM   #11
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Is my 27 year old furnace & A/C in need of replacement?


Okay, if 1985 was stamped on the unit than it very well may be 1985. I asked the tech on the phone what year the unit was and although he didn't get in depth as in he didn't research the serial number, he said the B in it was a production letter used in 1998 and 1999 units.

Now that's bugging me, I'll call again.
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Old 06-19-2012, 03:33 PM   #12
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Is my 27 year old furnace & A/C in need of replacement?


Okay, you wrote the serial number down incorrectly. There is only one letter in the serial number, the C.


Actual serial number is 4688C25066

First four numbers in the serial number dictate date of manufacture, week and then year:

46th week of 1988. Your unit is a 1998.

5/370 or 5/440 volt capacitor.
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Old 06-19-2012, 05:38 PM   #13
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Is my 27 year old furnace & A/C in need of replacement?


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Originally Posted by Doc Holliday View Post
Okay, you wrote the serial number down incorrectly. There is only one letter in the serial number, the C.


Actual serial number is 4688C25066

First four numbers in the serial number dictate date of manufacture, week and then year:

46th week of 1988. Your unit is a 1998.

5/370 or 5/440 volt capacitor.
So nice of you to call back! Thanks!!!
So I opened up my furnace and found a small oval mettalic thing that is secured onto the blower - says no pcbs, 370vac, 60hz, 6x653b, protected, p921, a10000afc 88-40z672, etc. Is that the capacitor? If so, will this be an OK replacement??? http://www.grainger.com/Grainger/DAY...BaseItem=6X653
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Old 06-19-2012, 06:15 PM   #14
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Is my 27 year old furnace & A/C in need of replacement?


I cant c the link from my phone. As long as its 5mfd itll work. And yes, thats the cap.
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Old 06-19-2012, 07:19 PM   #15
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Is my 27 year old furnace & A/C in need of replacement?


Here doc, since you do not have a droid or iphone:

Motor Run Capacitor, 5 MFD Rating, 370 Voltage, 60/50 Hz, Oval Shape, 2-3/16 Case Height (In.), 2-3/4 Overall Height (In.), 2 Width (In.), 1-1/4 Depth (In.), Terminals 4-blade Quick-connect Insulated, -40 to 70 Temp. Range (C), Construction Hermetically-Sealed Aluminum Case with Steel Cover, Standards cULs Recognized (E136401)

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