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Old 01-11-2017, 05:57 AM   #21
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Did you ever get your limit problem fixed yet,
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Old 01-11-2017, 09:42 AM   #22
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Nah. Going to have to wait until the weekend probably. I think I need to look closer at the routing of the ducts and maybe even replace one/some.
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Old 01-15-2017, 10:39 AM   #23
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Reporting back on this fix. Tore the furnace out yesterday and all of the vents. I thought I may replace some of the ducts completely but they cut 4" holes in multiple layers and have the ducting running through those so you can't just pull it through and string a new run in there. I did find that a 2 out of the four runs hit the register at a pretty steep angle though. This causes the flange on the register itself to block about 30% of the duct. So on one register I trimmed back that area so it wouldn't block it anymore. Here is a pic so you can see what I'm taking about. I'll do the same to the other one as well. Also rearranged what duct comes out of which port on the furnace to get the ports with less air pressure connected to the shortest runs. You can see this just by the design of the heat exchanger. Going to finish this on Monday. When I do I'll get back to this thread again.




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Old 01-15-2017, 11:48 AM   #24
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Reporting back on this fix. Tore the furnace out yesterday and all of the vents. I thought I may replace some of the ducts completely but they cut 4" holes in multiple layers and have the ducting running through those so you can't just pull it through and string a new run in there. I did find that a 2 out of the four runs hit the register at a pretty steep angle though. This causes the flange on the register itself to block about 30% of the duct. So on one register I trimmed back that area so it wouldn't block it anymore. Here is a pic so you can see what I'm taking about. I'll do the same to the other one as well. Also rearranged what duct comes out of which port on the furnace to get the ports with less air pressure connected to the shortest runs. You can see this just by the design of the heat exchanger. Going to finish this on Monday. When I do I'll get back to this thread again.




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You got to be kidding but I see the picture what is wrong with these people no QC at all. Do you have any cut outs on the pileum yet? I still think your a little short for CFM, but your finding so far might help. what a PITA on a new trailer, but you are better off doing it yourself....
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Old 01-15-2017, 11:58 AM   #25
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Sorry I don't know all the terms but what is the "pileum"?

Seriously though, it looks like these runs go through all sorts of angles, turns, through multiple 4" via holes.. It's crazy. But you can see if I had not cut out that section on the register, it would be protruding into the airspace of the duct, blocking it because of how they ran it to to register. I'll get some other pics tomorrow and you'll see what I mean. I really wish I could replace all the ducts but I think I'd have to really tear this thing apart to do so. I hope that with these mods it will be enough.

Another thing I did was to clip out every other cross slat on the register covers so that there are 50% less of them. This should reduce the air restriction at the register as well. It looks a lot more open and may not direct the air as well as it once did, but I think I would rather have the furnace working properly and not cycling off the limit switch. I guess this is part of the trade off given how they ran all the ducting. Will report back tomorrow with more pics. You'll laugh.


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Old 01-15-2017, 08:57 PM   #26
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Sorry I don't know all the terms but what is the "pileum"?

Seriously though, it looks like these runs go through all sorts of angles, turns, through multiple 4" via holes.. It's crazy. But you can see if I had not cut out that section on the register, it would be protruding into the airspace of the duct, blocking it because of how they ran it to to register. I'll get some other pics tomorrow and you'll see what I mean. I really wish I could replace all the ducts but I think I'd have to really tear this thing apart to do so. I hope that with these mods it will be enough.

Another thing I did was to clip out every other cross slat on the register covers so that there are 50% less of them. This should reduce the air restriction at the register as well. It looks a lot more open and may not direct the air as well as it once did, but I think I would rather have the furnace working properly and not cycling off the limit switch. I guess this is part of the trade off given how they ran all the ducting. Will report back tomorrow with more pics. You'll laugh.


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The pileum is the tin box that all the ducts hook to
(Sorry) with travel trailers they like to use the end to add ducts, that is bad the air has to mix, you have hot and cold spots coming off the heat exchanger
It is starting to sound like a crap duct insulation plus not dumping enough air, add another run, but before you do it remove a plate where a duct could be attached turn on the furnace and see if it cycles then. If it still cycles you more then likely have a bad limit, but I doubt it


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Old 01-15-2017, 09:48 PM   #27
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Ah ok. Yeah there are two ports on the face that aren't knocked out. I fixed a bunch of stuff and am testing it now.


Here you can see under the shower how they ran the duct tight against the wall and made an abrupt turn at the end to the register (duct on the left) and also how that support is right in the way.



Here you can see where I made a small gasket out of that insulation stuff for furnaces. It's the same material that goes around the burner piece. This will minimize any direct transfer of heat from the heat exchanger going to the limit switch.



Here you can see the limit switch with the gasket installed.




Here you can see how I cut out some of the slats on the register covers to help with the airflow.


Testing in progress so we will see how it goes. I'll report back.


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Old 01-15-2017, 10:00 PM   #28
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Damn. After about 18 minutes it hit the limit switch.

The only problem with adding another duct is that it faces the intake grate.






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Old 01-15-2017, 10:05 PM   #29
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Furnace Limit Cycling - Potential fix?

Took the front I take grate off to see if that helps at all and I'm testing again. What a pain in he a$s this is.


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Old 01-15-2017, 10:16 PM   #30
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Hit the limit after 14 mins. Going to pull the register covers off and try again.


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