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01-16-2017, 10:11 AM
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#41
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Member
Join Date: Jun 2013
Posts: 84
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Going to pull the unit out and clean the blower. It shouldn't be this difficult I think. I feel like I'm missing something.
Here is a couple of pictures of where the furnace is located. There is NO access panel on the outside. You have to extract the whole unit from the inside of you want to service it. You can see it below the oven and you can also see the hole I cut on the side where the duct is hanging out because you just can't get to it from the front because there's barely any room for your hands to get by.
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01-16-2017, 10:18 AM
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#42
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Member
Join Date: Jun 2013
Posts: 84
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Furnace Limit Cycling - Potential fix?
Here is inside the side panel I cut open. You can see that they put a duct front the other side of the furnace and exited in this picture. So the other two ducts have to come up at angles to reach their ports.
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01-16-2017, 10:51 AM
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#43
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Member
Join Date: Jun 2013
Posts: 84
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Picture of the blower blades that I'm trying to get to so I can clean them.
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01-16-2017, 10:55 AM
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#44
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Senior Member
Join Date: Feb 2012
Location: Clarksville Va.
Posts: 10,422
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Quote:
Originally Posted by Allistah
Here is inside the side panel I cut open. You can see that they put a duct front the other side of the furnace and exited in this picture. So the other two ducts have to come up at angles to reach their ports.
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Have you tried it just as in the picture? will it still shut off on limit? what a crap design. Get a grill at Lowes to cover your access hole. You use that as additional R/A , the vents behind the ducts is the entrance for R/A you have one on the other side and also one on the top. If it will work now I have an easy Idea how we can change that duct work to get better air flow...  PS where do those ducts go? the two.
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Coachmen M/H
Concord
2018 / 300 DSC
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01-16-2017, 11:07 AM
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#45
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Pickin', Campin', Mason
Join Date: Aug 2015
Location: South Western PA
Posts: 19,146
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Those fan blades look pretty clean to me.
Was this before or after you pulled to clean?
If before, that isn't going to gain you anything.
__________________
2022 Cedar Creek 345IK 5th Wheel•Solar & Inverter•2024 Ford F-Series SCREW•7.3L•4x4•Factory Puck•B&W Companion•TST Tire Monitor w/Repeater•Sinemate 3500w Gen.
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01-16-2017, 11:09 AM
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#46
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Member
Join Date: Jun 2013
Posts: 84
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Before. It must be only a duct problem then.
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01-16-2017, 11:13 AM
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#47
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Jack of All Trades
Join Date: Oct 2010
Location: Williston, Florida
Posts: 317
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I, too, would recommend replacing the limit click-it switch. After tripping many times, they start tripping at lower temperature. I had this same problem in the S&B, replacing the switch solved the problem.
Rick
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Rick & Debbie; Brandy Schnoodle & Bucky (Dexter & Fritz R.I.P.) the Doxie "Kids"
2015 Jayco Pinnacle 36RSQS 5'er
2018 GMC Sierra Denali 3500HD, 6.6L Diesel Dually; B&W Companion 5'er hitch
ScanGauge, TST 507 TPMS
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01-16-2017, 11:13 AM
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#48
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Senior Member
Join Date: Sep 2013
Location: Texas
Posts: 1,183
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The first year we had our RV I had the same problem with the limit you are having, dealer was no help. What I found was crushed ducts at the plenum, installed 4" aluminum ells that I bought at Home Depot. I also removed close to 6' of excess duct that was wadded behind the furnace, really increased the airflow. End of problem for me. Good luck with your issue, looks like you are on the right track.
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Joe & Beverly
2014 Ram 2500 CTD, CC, SB
2014 8289WS lifted
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01-16-2017, 11:14 AM
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#49
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Senior Member
Join Date: Jan 2015
Location: West Michigan
Posts: 641
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Hi I am a heating and cooling mechanic. The blower wheel look very clean from what i can see in the Pic. don't think this is the problem. You need to be very careful when you clean the blower wheel that you don't leave a small amount of dirt that will unbalance the wheel. I believe you were on the right track with the High limit when this thread started. Buy a new High limit and go from there.
Hope this helps Tim 
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01-16-2017, 11:14 AM
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#50
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Senior Member
Join Date: Feb 2012
Location: Clarksville Va.
Posts: 10,422
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Quote:
Originally Posted by Allistah
Picture of the blower blades that I'm trying to get to so I can clean them.
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Those are really clean that is not slowing the motor down. Do you have a clap around 12v meter that can read the amps you pulling from that motor? There is a name plate that says the # of amps it pulls under full load (FLA), If we are pulling more then rated amps then motor is not turning fast enough. Lets not worry about that yet...  I assume that there is a whole piece of metal covering that back where the blower is right? well we will never get more R/A then now turn it on with the back off and see if you cycle.
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Coachmen M/H
Concord
2018 / 300 DSC
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01-16-2017, 11:32 AM
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#51
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Member
Join Date: Jun 2013
Posts: 84
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No back. The open back almost goes up against the outside wall of the RV.
The limit switch is new. I bought a couple of them so that's not the issue.
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01-16-2017, 11:32 AM
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#52
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Senior Member
Join Date: Feb 2012
Location: Clarksville Va.
Posts: 10,422
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Quote:
Originally Posted by PhoneDude 8289
The first year we had our RV I had the same problem with the limit you are having, dealer was no help. What I found was crushed ducts at the plenum, installed 4" aluminum ells that I bought at Home Depot. I also removed close to 6' of excess duct that was wadded behind the furnace, really increased the airflow. End of problem for me. Good luck with your issue, looks like you are on the right track.
Attachment 128128 |
This is the problem he is having, I think the limit is good, not that new furnace can't come with a bad limit. But he has to solve the duct problem just as you did, I never seen such a mess, I would take pictures and call Suburban and get a hold of the GM. My unit in 2012 came with out any inside living space R/A grills, they never did. Now they come in the step riser, Suburban paid to have them cut in which is standard now but I made them close off that whole area so it can not draw from the basement also which he agree to.
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Coachmen M/H
Concord
2018 / 300 DSC
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01-16-2017, 11:34 AM
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#53
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Member
Join Date: Jun 2013
Posts: 84
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Cleaned the wheel as best I could with a small plastic brush. Installing it again now.
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01-16-2017, 11:35 AM
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#54
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Senior Member
Join Date: Feb 2012
Location: Clarksville Va.
Posts: 10,422
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Quote:
Originally Posted by Allistah
No back. The open back almost goes up against the outside wall of the RV.
The limit switch is new. I bought a couple of them so that's not the issue.
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You have Two issues that I see it is not the limit. Your duct work they they ran it, and most important the R/A sq. inches that is free.
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Coachmen M/H
Concord
2018 / 300 DSC
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01-16-2017, 11:36 AM
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#55
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Member
Join Date: Jun 2013
Posts: 84
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Some more pics of the area I'm dealing with:
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01-16-2017, 11:36 AM
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#56
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Senior Member
Join Date: Feb 2012
Location: Clarksville Va.
Posts: 10,422
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Quote:
Originally Posted by Allistah
Cleaned the wheel as best I could with a small plastic brush. Installing it again now.
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Run it with the back off and no ducts as in that picture, then tell us what happened...  by the way where do you live in the bay area, my business was in Martinez Cal. in the east bay 25 years I lived there.
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Coachmen M/H
Concord
2018 / 300 DSC
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01-16-2017, 11:38 AM
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#57
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Member
Join Date: Jun 2013
Posts: 84
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With propane on and all? I have to get it back in the hole to reach the propane line.
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01-16-2017, 11:39 AM
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#58
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Senior Member
Join Date: Feb 2012
Location: Clarksville Va.
Posts: 10,422
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Quote:
Originally Posted by Allistah
With propane on and all? I have to get it back in the hole to reach the propane line.
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Yes get to heat, I'll hangout until you get back to me. what the last picture in post 55 to
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Coachmen M/H
Concord
2018 / 300 DSC
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01-16-2017, 11:40 AM
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#59
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Member
Join Date: Jun 2013
Posts: 84
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Ok putting everything back together now.
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01-16-2017, 11:53 AM
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#60
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Senior Member
Join Date: Jun 2012
Posts: 10,907
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Quote:
Originally Posted by Witch Doctor
The pileum is the tin box that all the ducts hook to
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I think you're on the right track with improving air flow. Some folks have replaced all, or parts, of the corrugated ducting with smooth ducting as you find in a house. Anything you can do to improve air flow.
But just to be clear, in case you actually talk to a real furnace rep, the proper term is PLENUM, not pileum.
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