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Old 02-13-2012, 01:14 PM   #16
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My Carrier high efficiency furnace


I will check on them. By the way, when it failed to restart last time, I was able to get it restarted from the thermostat by switching to "fan only" and then back to "heat". That got the fan started first, then shut (when switched back to "heat", then the heat cycle started. Therefore, it appears after the furnace fails to restart, I could trick it to restart by either switching the power off and on or by switching the thermostat from "heat" to "Fan only" and back. I just do not understand where the problem is.
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Old 02-13-2012, 10:03 PM   #17
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I have attached photos of the furnace from outside to inside. It has a hot surface type ignitor which appears to work well.

My Carrier high efficiency furnace-furnace1.jpg

My Carrier high efficiency furnace-furnace2.jpg

My Carrier high efficiency furnace-furnace3.jpg

My Carrier high efficiency furnace-furnace4.jpg
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Old 02-13-2012, 10:11 PM   #18
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I would defiantly be looking at the secondary heat exchanger..........and also as i suspected, you DO have a flame sensor, as you stated.
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Old 02-13-2012, 10:25 PM   #19
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How can I tell if the secondary heat exchanger has a problem?
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Old 02-13-2012, 11:27 PM   #20
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Those are some poor looking gas lines. No drip legs and flex connectors to the furnace and water heater. If the installers didn't install drip legs (required by code and used to prevent foreign material from getting into your gas valve) who knows if they commissioned (temp rise, gas pressure, clocking, etc.) the furnace at all, which would lead to a shortened life span of the furnace.

Last edited by beenthere; 02-14-2012 at 04:12 PM. Reason: Softened comment
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Old 02-14-2012, 08:44 AM   #21
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This diagram does not match the furnace shown above.. Made me think it had no flame sensor...looks like we has wrong.

Quote:
Originally Posted by Houston204 View Post

Last edited by hvac5646; 02-14-2012 at 08:51 AM.
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Old 02-14-2012, 08:58 AM   #22
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How can I tell if the secondary heat exchanger has a problem?
From a assisted visual view, in your case I would remove the evaporator coil access door, then remove the panel to access the under side of the evaporator coil. From that point using a visual aide (a camera such as a sneaky snake) looking down past the primary at the secondary.

What you are looking for is a white crusty build up on the secondary, that would be a sure sign that the secondary heat exchanger is bad. you can also remove the blower and look up, but in your case you have a hell of a lot going on in the blower area, and I noticed that you also have a 5 ton drive (indicated by the dual blower housings).

Around here I would say that every 9 out of 10 that we look at have a bad heat exchanger. If you do find that it is bad I would call carrier, or a carrier dealer, If your the original home owner, it may still be covered for the parts anyway.Any time we change them out we always change primary and secondary, carrier was always OK with that and was easy to work with.
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Old 02-14-2012, 10:19 AM   #23
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after searching the internet I was able to find a picture of a bad carrier heat exchanger......here it is


Last edited by dosy777; 02-14-2012 at 10:22 AM.
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Old 02-14-2012, 06:38 PM   #24
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My Carrier high efficiency furnace


Look at the door switch is tape up and black marks behind it. Is that been tape the whole time?
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Old 02-14-2012, 07:00 PM   #25
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http://www.docs.hvacpartners.com/idc.../58d,s-8sm.pdf

Looks like the 1992 model 58SXC.


It still has an edge pin connection on top. Were you able to remove the connector and inspect for corrosion?


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Old 02-14-2012, 07:23 PM   #26
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Originally Posted by dosy777 View Post
I would defiantly be looking at the secondary heat exchanger..........and also as i suspected, you DO have a flame sensor, as you stated.

Where do you see a flame sensor?
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Old 02-14-2012, 07:38 PM   #27
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It appears that the 92 model had a flame sensor.

From the manual posted above...

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Old 02-14-2012, 07:43 PM   #28
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I'm still trying to get my head around the enclosed burner compartment of a 90% that uses bi metal controls. They seem too slow a choice to meet the challenge.
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Old 02-14-2012, 07:48 PM   #29
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I'm still trying to get my head around the enclosed burner compartment of a 90% that uses bi metal controls. They seem too slow a choice to meet the challenge.
They worked gooder than hell and were well ventilated and kept back from the main burner.
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Old 02-14-2012, 08:23 PM   #30
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hvac 5646: The flame sensor is in the flame compartment at the top. It is in pretty good condition based on my visual inspection.

hvac benny: The gas line does have a flexible connection to the far right of the furnace, but it does not have a drip section as you mentioned. I hope this did not cause the problem I am trying to deal with.

Houston204: I removed the edge pin connection, cleaned it with sand paper, and put it back. The connection looks fine or normal (no obvious corrosion noticed).

Tator1067: I taped up the door switch on suspicion of it being the problem. I accidentally had the hot wire touching the metal case resulting in the black mark (and tripping the circut breaker).

I will try to figure out how to inspect the secondary heat exchanger. This is going to be a difficult job.
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