Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×
 


Reply
 
Thread Tools Search this Thread Display Modes
 
Old 09-07-2013, 08:54 AM   #1
Winnebago Camper
 
joemcgin's Avatar
 
Join Date: Mar 2013
Location: Franklin, Mass.
Posts: 40
LP Furnace question 2000 Adventurer 32V

Hi all,

Was down preparing the coach for the fall and thought I'd fire up the LP Suburban SF-25 furnace and only seem to get heat out of the floor register's. The burner lights fine and the exhaust and intake vents are all clear. It does not seem to be a strong flow from the floor vents and was wondering what to expect from the LP Blower. The electric heat pump blows fine from the ceiling vents as expected. After about 10 minutes the coach does start to warm up, but heat doesn't really seem to be blasting out of the floor vents. We haven't had to use the LP furnace since we bought the coach so we don't really know what to expect. Thanks.
__________________
Joe & Kathy
2000 Winnebago Adventurer 32V Workhorse Chassis
joemcgin is offline   Reply With Quote
Old 09-07-2013, 02:55 PM   #2
Winnebago Owner
 
Join Date: Sep 2012
Posts: 60
They usually aren't very strong. You can go to the furnace and make sure that all the ducts are on good and nothing is leaking air, but that's about it.
jesilvas is offline   Reply With Quote
Old 09-07-2013, 03:02 PM   #3
Winnebago Owner
 
sswilson's Avatar
 
Join Date: Nov 2012
Location: Cobble Hill, B.C.
Posts: 62
Have you checked or replaced your filter? Are you somehow blocking the cold air return to the furnace? If the fan sounds okay, those two things could be slowing the air flow down. I have a 35U and have a filter under the bed and cold air return on the wall near make up mirror area.
__________________
Steve and Sheri with Archie (and Hiro, R.I.P.)
2000 Winnebago 35U, Ford F53/6.8l V10
F150 Ford and Vintage Aspencade.
sswilson is offline   Reply With Quote
Old 09-07-2013, 03:12 PM   #4
Winnebago Camper
 
joemcgin's Avatar
 
Join Date: Mar 2013
Location: Franklin, Mass.
Posts: 40
Thank you for the replies. I changed the AC air return filter under the bed last month. Both vents at the rear of the coach are free from obstructions. I don't know of any cold air intake location inside of the coach and nothing in my manuals about one.
__________________
Joe & Kathy
2000 Winnebago Adventurer 32V Workhorse Chassis
joemcgin is offline   Reply With Quote
Old 09-07-2013, 03:20 PM   #5
Winnebago Owner
 
sswilson's Avatar
 
Join Date: Nov 2012
Location: Cobble Hill, B.C.
Posts: 62
The cold air returns I speak of are not from the outside but the openings where the furnace draws air from inside the coach. Sounds like you checked them and they are okay.
__________________
Steve and Sheri with Archie (and Hiro, R.I.P.)
2000 Winnebago 35U, Ford F53/6.8l V10
F150 Ford and Vintage Aspencade.
sswilson is offline   Reply With Quote
Old 09-07-2013, 03:25 PM   #6
Registered User
 
mel s's Avatar
 
Join Date: Mar 2010
Posts: 340
Quote:
Originally Posted by jesilvas View Post
They usually aren't very strong. You can go to the furnace and make sure that all the ducts are on good and nothing is leaking air, but that's about it.
jesilvas
----X2!
Mel
'96 Safari
mel s is offline   Reply With Quote
Old 09-07-2013, 03:29 PM   #7
Winnebago Owner
 
sswilson's Avatar
 
Join Date: Nov 2012
Location: Cobble Hill, B.C.
Posts: 62
Just to clarify, I have a screened area on the side of the cabinet in the bedroom that is what i call the cold air return for the furnace. It just picks up previously heated air and returns it for reheating in the furnace. System does not work as efficiently without this return and will slow down the flow. I do not know your model, but Winnebago should be able to tell you where it may be. I have always found them very helpful.
__________________
Steve and Sheri with Archie (and Hiro, R.I.P.)
2000 Winnebago 35U, Ford F53/6.8l V10
F150 Ford and Vintage Aspencade.
sswilson is offline   Reply With Quote
Old 09-07-2013, 03:34 PM   #8
Winnebago Owner
 
Join Date: Sep 2012
Posts: 60
Just go outside, find the outside vents. Then go inside to the exact same place, and pull a cover off, it'll be there.
jesilvas is offline   Reply With Quote
Old 09-07-2013, 03:55 PM   #9
Winnebago Master
 
wa8yxm's Avatar
 
Join Date: Mar 2009
Posts: 851
Here is how you tell if the air flow is strong enough.

(I will give you the furnace cycle)

Thermostat calls for heat
Mother board (Control board) fires up the BLOWER
***SAIL SWITCH CLOSES*** when air flow is high enough
Mother calls for Propane and begains ignightor.
Flame happens
A: Mother switches from IGNIGHTION to flame sense
B: Mother senses flame from seperate flame sensor
Flame continues till T-Stat says "WARM ENOUGH"
Mother shuts down propane, flame off
Mother shuts down blower (After a short cool down)

Re-The A and B above
Some systems have a single wire and "probe" that is both the ignightor and the flame sensor

Some have 2 wires and two probes.

Since the flame comes on, the air flow is enough to close the sail switch and you do not have a problem.
__________________
Home is where I park it!
[SIGPIC][/SIGPIC]
wa8yxm is offline   Reply With Quote
Old 09-07-2013, 03:55 PM   #10
Winnebago Owner
 
sswilson's Avatar
 
Join Date: Nov 2012
Location: Cobble Hill, B.C.
Posts: 62
There should not be a cover on a cold air return vent. It should usually be a screened area that covers a duct back to the furnace. This is what allows or makes the air move properly in the coach and it should not be real close to the furnace itself.
__________________
Steve and Sheri with Archie (and Hiro, R.I.P.)
2000 Winnebago 35U, Ford F53/6.8l V10
F150 Ford and Vintage Aspencade.
sswilson is offline   Reply With Quote
Old 09-07-2013, 04:34 PM   #11
Registered User
 
mel s's Avatar
 
Join Date: Mar 2010
Posts: 340
Quote:
Originally Posted by sswilson View Post
There should not be a cover on a cold air return vent. It should usually be a screened area that covers a duct back to the furnace. This is what allows or makes the air move properly in the coach and it should not be real close to the furnace itself.
My Suburban SF-42F LP furnace is under my street side refrigerator.
The wooden return/cold air louver is 6 inches in front off the furnace, (toward the curb side)..... however, the nearest of the 5 heat registers IS 5 feet from the return air louver.

BTW, For my furnace, Suburban specifies that no filter, (and no screen), be used in the cold air return, the heat ducts and/or the registers.

Mel
'96 Safari Sahara
mel s is offline   Reply With Quote
Old 09-07-2013, 04:43 PM   #12
Winnebago Owner
 
sswilson's Avatar
 
Join Date: Nov 2012
Location: Cobble Hill, B.C.
Posts: 62
I agree that there should not be any obstruction in the cold air return. Mine is a decorative screen so it is not just a hole in the wall. The unfortunate part is that you are unsure what it is, you could block it off by setting a box (example) beside it. This will prevent the proper circulation of heated air and maybe make the flow thru the heat vents less than what they should be.
__________________
Steve and Sheri with Archie (and Hiro, R.I.P.)
2000 Winnebago 35U, Ford F53/6.8l V10
F150 Ford and Vintage Aspencade.
sswilson is offline   Reply With Quote
Old 09-07-2013, 05:01 PM   #13
Winnie-Wise
 
Sammie's Avatar
 
Join Date: Jun 2006
Location: Southern California
Posts: 489
Quote:
Originally Posted by joemcgin View Post
Thank you for the replies. I changed the AC air return filter under the bed last month. Both vents at the rear of the coach are free from obstructions. I don't know of any cold air intake location inside of the coach and nothing in my manuals about one.
Joe, I had a 2000 Winnebago Adventurer 32 ft. and the cold air return for the Suburban floor furnace is straight above the furnace itself on the bedroom floor. The only return air filter is the one located near the back of the coach and it is for the air conditioner. I found that when using the floor furnace, the further forward you go, the less the airflow you will get from the floor duct openings.

Sammie
__________________
2015 Tiffin Bus 37AP
2016 Ford Explorer
"A Job Begun is Half Done"
Sammie is offline   Reply With Quote
Old 09-07-2013, 06:55 PM   #14
Winnebago Master
 
Join Date: Nov 2005
Posts: 1,080
If the furnace starts moving warm air the fan is blowing at the proper speed. Before the furnace ignites the blower starts. It has to blow hard enough to open a door at the exit end of the heat exchanger. When the door is open it closes a sail switch that allows the gas to flow and the igniter to work. If the blower isn't moving enough air to open the door and make the switch the furnace will not start.
__________________
Hikerdogs
2013 Adventurer 32H
Hikerdogs is offline   Reply With Quote
Old 09-07-2013, 07:35 PM   #15
Winnebago Camper
 
joemcgin's Avatar
 
Join Date: Mar 2013
Location: Franklin, Mass.
Posts: 40
I get hot air coming out of the furnace exhaust vent on the rear of the coach on the outside of the bedroom wall. 2 vents there; 1 exhaust vent & the other I'm assuming is the outside air intake to the furnace. Will have to check the coach after it gets out of the shop for a bad fuel pump. No access to it while its in the shop. Thanks again all.
__________________
Joe & Kathy
2000 Winnebago Adventurer 32V Workhorse Chassis
joemcgin is offline   Reply With Quote
Old 09-08-2013, 05:19 PM   #16
Winnebago Camper
 
Join Date: Sep 2013
Posts: 5
I recently purchased a 2000 35U Adventurer and the furnace operated as described in the original post when I took posession.

My low air volume was caused by a massive air leak at the furnace housing. I removed the outer cover and there was a one inch gap all the way around between the furnace housing and the rear cap. (My furnace is mounted in the rear) I bought a rubber garage door seal from a hardware store and fabricated a seal between the body and the furnace.

Now when the furnace runs it must draw air from inside the coach creating a negative pressure which allow's heated air to enter the coach. This is the way it is designed to operate. Before the repair the furnace was drawing air from outside and trying to force it into an enclosed space, resulting in the poor performance.
Dispatcher is offline   Reply With Quote
Old 09-08-2013, 08:25 PM   #17
Winnebago Camper
 
joemcgin's Avatar
 
Join Date: Mar 2013
Location: Franklin, Mass.
Posts: 40
Does the LP Furnace air return on this model (32V) use the same return as the AC that is positioned on the passenger side of the Coach under the Queen bed? That is the only return I can recall seeing. The furnace itself is at the very rear of the Coach mounted underneath the Queen bed storage area. Just want to be sure we're talking about the same thing. I will also check into the Vent Cap seal as well. Thanks for the suggestions.
__________________
Joe & Kathy
2000 Winnebago Adventurer 32V Workhorse Chassis
joemcgin is offline   Reply With Quote
Old 09-08-2013, 11:05 PM   #18
Winnebago Master
 
DAN L's Avatar
 
Join Date: Sep 2007
Posts: 724
Quote:
Originally Posted by joemcgin View Post
Hi all,

Was down preparing the coach for the fall and thought I'd fire up the LP Suburban SF-25 furnace and only seem to get heat out of the floor register's. The burner lights fine and the exhaust and intake vents are all clear. It does not seem to be a strong flow from the floor vents and was wondering what to expect from the LP Blower. The electric heat pump blows fine from the ceiling vents as expected. After about 10 minutes the coach does start to warm up, but heat doesn't really seem to be blasting out of the floor vents. We haven't had to use the LP furnace since we bought the coach so we don't really know what to expect. Thanks.
here is a link to the manuals.
i installed registers with closeable dampers from home depot in the rear most areas. that helped get more air to the front registers.

Service Documents
__________________
01 WINNEBAGO 35U W20.8.1L SW Wa, Hi. Good Sam, SKP. AMSOIL fluids. BANKS ecm program. SCAN GAUGE II w/ Ally temp. 2 LIFELINE GPL-6CT AGM Batts on their sides. TST tptts. K&N panel air filter. AERO mufflers. TAYLOR plug wires. ULTRA POWER track bar. KONI fsd shocks, toad '14 smart car
DAN L is offline   Reply With Quote
Old 09-09-2013, 05:04 AM   #19
Winnebago Owner
 
Join Date: Jul 2012
Posts: 122
As long as you're checking out the Heating system, I expect that your unit has a Motoraid Coach heater.
Be sure to check out the Dash Switch for the Aux Blower Motor. It should work on both Lo & Hi.

This pushes hot air through the Same duct system that the rear furnace uses.

I had to replace mine due to the well-known design flaw in the bird cage assy. Not fun, but educational..........

If you need any further info, please email me.

Keep us posted.
Thanks,
paul
__________________
2001 Winnebago Adventurer 32V, Ford F-53, V-10
2008 Jeep Grand Cherokee Limited, 4.7L V-8 QTII
U. S. Army Vet, In God We Trust
winnie32v is offline   Reply With Quote
Old 09-09-2013, 05:12 AM   #20
Winnebago Camper
 
joemcgin's Avatar
 
Join Date: Mar 2013
Location: Franklin, Mass.
Posts: 40
That Aux heater worked a few weeks ago. Made a screeching noise when I hit the switch when I bought the Coach in April but after hitting a bump the noise went away.
__________________
Joe & Kathy
2000 Winnebago Adventurer 32V Workhorse Chassis
joemcgin is offline   Reply With Quote
Reply

Tags
furnace, vent


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
02 Adventurer 32v vs 05 Sightseer 30b rvingboo Winnebago Class A Motorhomes 14 04-02-2008 11:03 AM
2000 Adventurer 35U Furnace Finhawk Winnebago Class A Motorhomes 11 01-22-2008 06:19 PM
Utility light - Adventurer 32v Hardy Winnebago Class A Motorhomes 7 02-08-2005 04:33 PM

» Featured Campgrounds

Reviews provided by

Disclaimer:

This website is not affiliated with or endorsed by Winnebago Industries or any of its affiliates. This is an independent, unofficial site.


All times are GMT -6. The time now is 05:16 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.