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Care and Upkeep Let's face it, it has to be done. Have questions of what to do or how to do it, this is the place to talk about it.

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  #1  
Old 12-28-2010
Turbokitty's Avatar
Turbokitty Turbokitty is offline
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Join Date: Apr 2008
Location: Clearwater
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Default Suburban heaters...

It's too cold to do the paintwork on the FC generator mod so I thought I would service the Suburban furnaces

Just for clarification, I permanently removed the center gas furnace when I installed the RV500 tankless, on demand propane water heater. I used the center gas furnace area for a bit of water heater plumbing and storage for the George Foreman grill

Both my front and rear Suburbans have been acting up with things such as getting stuck in the cool down cycle. Not wanting to relight and always in the middle of the night when it was %^&*! cold inside the coach. Crazy thing was with the grill off, I could give the unit a "rap" with a small hammer and it would fire off... Go figure!

Well, I really wish I could have made it to Shanes furnace seminar at RATS 'cause I am sure I would have learned a few things Fortunately, the Suburban owners manual is very helpful!

Bottom line is, I did a complete disassembly (one at a time) and found a few issues.

1. Lots of rust debris and a very large Mud Dauber nest way down inside the rear unit.

2. A stuck fan sensor (the disk type)

3. A very gummy air flow sensor.

4. A few loose electrical connections.

5. Both burners had the gas burner slots fairly plugged up with rust.

6. Improper spark and probe gaps.

Conclusion is the big culprit (IMHO) was the plugged up burner slots causing poor combustion which sooted up the ignitor electrode causing all kinds of irratic problems.

Another observation is the openings for the heat to escape into the coach are very much undersized. The pictures include the start of a modification to my front heater which initially had to be cut out via the couch cushion base.

My mod will provide a larger opening both for the heat and to now remove the unit from the front instead of through the couch cushion base.

Didn't get any pictures of the plugged up burner assemblies, sorry

Both heaters now work as designed!! No more cold nights for the little woman! AMEN
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Ryan and Michelle Saari
Timberlake Products Group, Inc.
1985 PT36
1983 FC35RB Left me for Atlanta!
Clearwater, Florida
https://www.timberlakeproductsgroup.com/
https://www.ebay.com/str/timberlakeproductsgroup

Last edited by Turbokitty; 12-28-2010 at 11:01 PM.
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  #2  
Old 12-29-2010
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Driver Driver is offline
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Just in case others might not know... Don't forget the wire covers over the external intake and exhaust ports! Ignore the OE warnings against them, they are not paying your fees to have the furnace pulled and the nests removed. Daubers love them some propane.
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'94 34' Safari Serengeti sold - Mom remarried @71 and they upgraded to a newer Coach w/Slides


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  #3  
Old 12-29-2010
Chuck Chuck is offline
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I have just replaced the brushes in the fan motor in a NT12. The brushes were GONE just dust in the motor what a mess! Also polished the commutator with 400 grit paper. The motor was running slowly and no power. It took about 4 hours to R&R the unit and replace the brushes. I found the brushes at the local hardware store, 1/4 X 1/4 inch cost 3.90 each. Now the unit runs at full power.
Tomorrow I will remove the front unit a NT16. I plan to replace the bearings as well as the brushes.
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79' FC 33 SB
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  #4  
Old 12-30-2010
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Turbokitty Turbokitty is offline
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Got the front furnace mod complete. It all went well. What was accomplished?

1. A complete dissassembly and service of both furnaces (See post #1)

2. Modified the front couch so it does not have to be gutted to get to the furnace. The furnace is now removable from the front via a removable panel.

3. Modified the furnace with a much larger front opening and added front retaining screw floor mounts.

The new opening is double that of the old one and really does allow much more heat flow into the bus

Whoo-Hoo
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Ryan and Michelle Saari
Timberlake Products Group, Inc.
1985 PT36
1983 FC35RB Left me for Atlanta!
Clearwater, Florida
https://www.timberlakeproductsgroup.com/
https://www.ebay.com/str/timberlakeproductsgroup
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  #5  
Old 12-30-2010
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Randy Dupree Randy Dupree is offline
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nice job!
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2000 LXI 43
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  #6  
Old 12-31-2010
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Bill Pape Bill Pape is offline
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Quote:
Originally Posted by Turbokitty View Post
Got the front furnace mod complete. It all went well. What was accomplished?

1. A complete dissassembly and service of both furnaces (See post #1)

2. Modified the front couch so it does not have to be gutted to get to the furnace. The furnace is now removable from the front via a removable panel.

3. Modified the furnace with a much larger front opening and added front retaining screw floor mounts.

The new opening is double that of the old one and really does allow much more heat flow into the bus

Whoo-Hoo
Yep we need more heat in Florida
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1988 FC, Silver Edition
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  #7  
Old 12-31-2010
Frank W. Frank W. is offline
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Quote:
Originally Posted by Turbokitty View Post
Got the front furnace mod complete. It all went well. What was accomplished?

1. A complete dissassembly and service of both furnaces (See post #1)

2. Modified the front couch so it does not have to be gutted to get to the furnace. The furnace is now removable from the front via a removable panel.

3. Modified the furnace with a much larger front opening and added front retaining screw floor mounts.

The new opening is double that of the old one and really does allow much more heat flow into the bus


Whoo-Hoo
Humm, you have given me something to think about. I tend to "feel" the very front of the bus gets cold, i guess due to all the glass...and wondered about getting more air out of the furnace. One thought was to run a duct forward...there is an available round cut out for it...but it would impact my spare part storage beneath the couch. I need to either enlarge the vents or run the hose and loose some storage space with a duct.

Good write up!
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Coach photos & comments: http://www.wanderlodgeownersgroup.co...php?albumid=79
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  #8  
Old 12-31-2010
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Buckeye Bird Buckeye Bird is offline
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Nice, sensible and well thought out mod.

Good job, Ryan.
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  #9  
Old 12-31-2010
Chuck Chuck is offline
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To even out the heat in my Bird I use a small fan mounted near the front and blowing down. This circulates the air and evens out the temp all through the Bird.
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79' FC 33 SB
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