Home » Public Forums » GMCnet » [GMCnet] furnace choices
| [GMCnet] furnace choices [message #84078] |
Tue, 11 May 2010 12:06  |
KB
Messages: 1262
Registered: September 2009
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Has anybody here installed an Atwood furnace? Is it possible to make the exterior face
on these match the angled side of the body (maybe a bit of sheet metal work?)?
I'm thinking of upgrading from our original furnace. Newer ones are a lot smaller and
hopefully more efficient. Space in a 23' is at a premium. I'm thinking the exterior access
of the Atwoods might be easier to live with and design around. Any thoughts?
thanks,
Karen
1973 23' Patience Tester
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1975 26'
San Jose, CA
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| Re: [GMCnet] furnace choices [message #84081 is a reply to message #84078] |
Tue, 11 May 2010 12:20  |
jayrabe
Messages: 509
Registered: June 2009
Location: Portland, OR
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I have an Atwood, installed by PO. Never noticed any problems with fit of the access panel. But looking more closely, now that you've asked, I can see that it doesn't look like they did anything to put curve into the panel. Actually there isn't a lot of curvature of the coach wall down low where the furnace mounts, but it does look like, while the top of the panel is tightly flush to the coach wall, the bottom is out just a bit, maybe 1/6" or 3/32". Not enough to look bad for sure.
What I can tell you is that if you have a problem starting the furnace, as I have had for unknown reasons perhaps due to it's having sat for many months without being used, you have to flip a reset switch that you get to through the access panel. And if it doesn't start right away when you go back inside and turn on the blower and thermostat, then you have to go back outside and reset it again. In my case, it took many (a dozen?) trips back and forth between the thermostat and blower switch inside and the reset switch outside until it finally came on. Pretty obnoxious. I'm going to be taking it in to a local shop that supposedly has expertise in RV furnaces to see what's going on.
J
76 PB
Portland, OR
> Date: Tue, 11 May 2010 10:06:29 -0700
> From: kab7@sonic.net
> To: gmclist@temp.gmcnet.org
> Subject: [GMCnet] furnace choices
>
> Has anybody here installed an Atwood furnace? Is it possible to make the exterior face
> on these match the angled side of the body (maybe a bit of sheet metal work?)?
>
> I'm thinking of upgrading from our original furnace. Newer ones are a lot smaller and
> hopefully more efficient. Space in a 23' is at a premium. I'm thinking the exterior access
> of the Atwoods might be easier to live with and design around. Any thoughts?
>
> thanks,
> Karen
> 1973 23' Patience Tester
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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| Re: [GMCnet] furnace choices [message #84086 is a reply to message #84078] |
Tue, 11 May 2010 13:13 |
emerystora
Messages: 4442
Registered: January 2004
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On May 11, 2010, at 11:06 AM, KB wrote:
> Has anybody here installed an Atwood furnace? Is it possible to make the exterior face
> on these match the angled side of the body (maybe a bit of sheet metal work?)?
>
> I'm thinking of upgrading from our original furnace. Newer ones are a lot smaller and
> hopefully more efficient. Space in a 23' is at a premium. I'm thinking the exterior access
> of the Atwoods might be easier to live with and design around. Any thoughts?
>
> thanks,
> Karen
> 1973 23' Patience Tester
Here is something that Bill Bryant posted in June 2009:
> If you have to replace an old Sol Air, you will have to do some real work. If you ues an NT series furnace, because of the slope in the wall, the venting system needs to be curved downward, and/or the furnace needs to be mounted on an angle, and it was really not designed to do that. New holes need to be drilled in the coach wall also. Most conversions just left the original stainless steel covers for the Sol Air vents in place.
>>
>
> Here is what I did:
> Had a Sol Air in my 76 PB. Replaced it with an Atwood hydroflame (pancake model) which is about half as high as the old furnace (33K BTU). Believe Suburban makes a model like this also.
>
> Mounted mine FLAT. Put down a sheet of tin on the floor, used 2 pieces of 3/4" electrical conduit fastened to the tin as spacers to sit the furnace on. Cut the opening for the external access door. Made a simple filler of sheet metal to fill the top & side furnace to body gaps. Caulked all seams/joints.
>
> I carefully positioned the furnace so that the old exterior vent holes fell within the access door area so that no patching was necessary. I know that many of us cringe at the thought of cutting a hole in the skin, so did I. Did this a number of years ago and not sorry that I did it this way. Access to the workings of the furnace is great and it has been a very reliable unit.
>
> With the reduced height I now had room for a new storage drawer on rollers above the furnace. Put a sheet of tin on the bottom of the drawer to reflect furnace heat also. All spacing per manufactures specs was maintained.
>
> And maybe best of all, SHE loves the extra storage.
Emery Stora
77 Kingsley
Santa Fe, NM
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| Re: [GMCnet] furnace choices [message #84087 is a reply to message #84078] |
Tue, 11 May 2010 13:27 |
KB
Messages: 1262
Registered: September 2009
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Good point -- might have to have somebody else inside working the thermostat to avoid the extra trips.
Not to mention troubleshooting on a cold wet night...
I think the Atwood Everest (inside mount) are the most energy efficient in terms of battery draw,
but about 20K btu seems to be the biggest one which might not be enough. Most other furnaces use
a lot more power. Every new furnace I've seen is much smaller physically than the old one, thank goodness.
Which makes me wonder: how 12-volt efficient the old ones are with a pilot instead of a spark ignition?
Has anyone measured this?
thanks,
Karen
1973 23' Patience Tester
>
> I have an Atwood, installed by PO. Never noticed any problems with fit of the access panel. But looking more closely, now that you've asked, I can see that it doesn't look like they did anything to put curve into the panel. Actually there isn't a lot of curvature of the coach wall down low where the furnace mounts, but it does look like, while the top of the panel is tightly flush to the coach wall, the bottom is out just a bit, maybe 1/6" or 3/32". Not enough to look bad for sure.
> What I can tell you is that if you have a problem starting the furnace, as I have had for unknown reasons perhaps due to it's having sat for many months without being used, you have to flip a reset switch that you get to through the access panel. And if it doesn't start right away when you go back inside and turn on the blower and thermostat, then you have to go back outside and reset it again. In my case, it took many (a dozen?) trips back and forth between the thermostat and blower switch inside and the reset switch outside until it finally came on. Pretty obnoxious. I'm going to be taking it in to a local shop that supposedly has expertise in RV furnaces to see what's going on.
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Karen
1975 26'
San Jose, CA
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| Re: [GMCnet] furnace choices [message #84109 is a reply to message #84078] |
Tue, 11 May 2010 15:59 |
Ray Erspamer
Messages: 1707
Registered: May 2007
Location: Milwaukee Wisconsin
Karma: -3
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I replaced my furnace with a low profile Suburban, it works incredible
and the only thing on the outside of the coach is an intake and exhaust
place about 3" x 6". You can see it in the picture at the attached link.
VERY EASY INSTALL!
http://www.rvcomfort.com/suburban/products/furnaces/sf.php
Ray & Lisa Erspamer
78 Royale Center Kitchen
TZE368V101144
Wauwatosa, Wisconsin 53226
Email: 78GMC-Royale@att.net
414-745-3188
Web Site: http://ray-lisa.page.tl/
________________________________
From: KB <kab7@sonic.net>
To: gmclist@temp.gmcnet.org
Sent: Tue, May 11, 2010 12:06:29 PM
Subject: [GMCnet] furnace choices
Has anybody here installed an Atwood furnace? Is it possible to make the exterior face
on these match the angled side of the body (maybe a bit of sheet metal work?)?
I'm thinking of upgrading from our original furnace. Newer ones are a lot smaller and
hopefully more efficient. Space in a 23' is at a premium. I'm thinking the exterior access
of the Atwoods might be easier to live with and design around. Any thoughts?
thanks,
Karen
1973 23' Patience Tester
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
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Ray Erspamer
78 GMC Royale Center Kitchen
403, 3.70 Final Drive
Holley Sniper Quadrajet EFI System,
Holley Hyperspark Ignition System
414-484-9431
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| Re: [GMCnet] furnace choices [message #84117 is a reply to message #84109] |
Tue, 11 May 2010 16:38 |
Gary Worobec
Messages: 867
Registered: May 2005
Karma: -1
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Hi,
I used the same furnace in my '23 mounted on the floor under the fridge. I
found the angle of the outside skin of the coach to be too much to get what
I felt would be a good seal so built a wedge shaped box and then mounted the
exhaust vertical in it.
<table style="width:auto;"><tr><td><a
href="http://picasaweb.google.com/lh/photo/i_5Y35xbB0HX2EBk-3JMFw?feat=embedwebsite"><img
src="http://lh6.ggpht.com/_UyAfvrvL3Y0/S-nNs7IlvwI/AAAAAAAABSs/CE1i41G10d8/s144/IMG_1129.JPG"
/></a></td></tr><tr><td style="font-family:arial,sans-serif; font-size:11px;
text-align:right">From <a
href="http://picasaweb.google.com/GaryTWMW/Heater?feat=embedwebsite">heater</a></td></tr></table>
Thanks
Gary and Joanne Worobec
1973 GMC Glacier
Anza, CA
----- Original Message -----
From: "Ray Erspamer" <78gmc-royale@att.net>
To: <gmclist@temp.gmcnet.org>
Sent: Tuesday, May 11, 2010 1:59 PM
Subject: Re: [GMCnet] furnace choices
>
> I replaced my furnace with a low profile Suburban, it works incredible
> and the only thing on the outside of the coach is an intake and exhaust
> place about 3" x 6". You can see it in the picture at the attached link.
>
> VERY EASY INSTALL!
>
>
> http://www.rvcomfort.com/suburban/products/furnaces/sf.php
>
>
> Ray & Lisa Erspamer
> 78 Royale Center Kitchen
> TZE368V101144
> Wauwatosa, Wisconsin 53226
> Email: 78GMC-Royale@att.net
> 414-745-3188
> Web Site: http://ray-lisa.page.tl/
>
>
>
>
> ________________________________
> From: KB <kab7@sonic.net>
> To: gmclist@temp.gmcnet.org
> Sent: Tue, May 11, 2010 12:06:29 PM
> Subject: [GMCnet] furnace choices
>
> Has anybody here installed an Atwood furnace? Is it possible to make the
> exterior face
> on these match the angled side of the body (maybe a bit of sheet metal
> work?)?
>
> I'm thinking of upgrading from our original furnace. Newer ones are a lot
> smaller and
> hopefully more efficient. Space in a 23' is at a premium. I'm thinking
> the exterior access
> of the Atwoods might be easier to live with and design around. Any
> thoughts?
>
> thanks,
> Karen
> 1973 23' Patience Tester
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
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List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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| Re: [GMCnet] furnace choices [message #84118 is a reply to message #84117] |
Tue, 11 May 2010 16:39 |
Gary Worobec
Messages: 867
Registered: May 2005
Karma: -1
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Senior Member |
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Wrong link, sorry
http://picasaweb.google.com/lh/photo/i_5Y35xbB0HX2EBk-3JMFw?feat=directlink
Thanks
Gary and Joanne Worobec
1973 GMC Glacier
Anza, CA
----- Original Message -----
From: "Gary Worobec" <gtw5@earthlink.net>
To: <gmclist@temp.gmcnet.org>
Sent: Tuesday, May 11, 2010 2:38 PM
Subject: Re: [GMCnet] furnace choices
> Hi,
> I used the same furnace in my '23 mounted on the floor under the fridge. I
> found the angle of the outside skin of the coach to be too much to get
> what
> I felt would be a good seal so built a wedge shaped box and then mounted
> the
> exhaust vertical in it.
>
>
> <table style="width:auto;"><tr><td><a
> href="http://picasaweb.google.com/lh/photo/i_5Y35xbB0HX2EBk-3JMFw?feat=embedwebsite"><img
> src="http://lh6.ggpht.com/_UyAfvrvL3Y0/S-nNs7IlvwI/AAAAAAAABSs/CE1i41G10d8/s144/IMG_1129.JPG"
> /></a></td></tr><tr><td style="font-family:arial,sans-serif;
> font-size:11px;
> text-align:right">From <a
> href="http://picasaweb.google.com/GaryTWMW/Heater?feat=embedwebsite">heater</a></td></tr></table>
>
>
> Thanks
>
> Gary and Joanne Worobec
> 1973 GMC Glacier
> Anza, CA
>
> ----- Original Message -----
> From: "Ray Erspamer" <78gmc-royale@att.net>
> To: <gmclist@temp.gmcnet.org>
> Sent: Tuesday, May 11, 2010 1:59 PM
> Subject: Re: [GMCnet] furnace choices
>
>
>>
>> I replaced my furnace with a low profile Suburban, it works incredible
>> and the only thing on the outside of the coach is an intake and exhaust
>> place about 3" x 6". You can see it in the picture at the attached link.
>>
>> VERY EASY INSTALL!
>>
>>
>> http://www.rvcomfort.com/suburban/products/furnaces/sf.php
>>
>>
>> Ray & Lisa Erspamer
>> 78 Royale Center Kitchen
>> TZE368V101144
>> Wauwatosa, Wisconsin 53226
>> Email: 78GMC-Royale@att.net
>> 414-745-3188
>> Web Site: http://ray-lisa.page.tl/
>>
>>
>>
>>
>> ________________________________
>> From: KB <kab7@sonic.net>
>> To: gmclist@temp.gmcnet.org
>> Sent: Tue, May 11, 2010 12:06:29 PM
>> Subject: [GMCnet] furnace choices
>>
>> Has anybody here installed an Atwood furnace? Is it possible to make the
>> exterior face
>> on these match the angled side of the body (maybe a bit of sheet metal
>> work?)?
>>
>> I'm thinking of upgrading from our original furnace. Newer ones are a lot
>> smaller and
>> hopefully more efficient. Space in a 23' is at a premium. I'm thinking
>> the exterior access
>> of the Atwoods might be easier to live with and design around. Any
>> thoughts?
>>
>> thanks,
>> Karen
>> 1973 23' Patience Tester
>> _______________________________________________
>> GMCnet mailing list
>> List Information and Subscription Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>> _______________________________________________
>> GMCnet mailing list
>> List Information and Subscription Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
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| Re: [GMCnet] furnace choices [message #84119 is a reply to message #84118] |
Tue, 11 May 2010 16:43 |
Gary Worobec
Messages: 867
Registered: May 2005
Karma: -1
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Senior Member |
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http://lh6.ggpht.com/_UyAfvrvL3Y0/S-nNs7IlvwI/AAAAAAAABSs/CE1i41G10d8/s400/IMG_1129.JPG
----- Original Message -----
From: "Gary Worobec" <gtw5@earthlink.net>
To: <gmclist@temp.gmcnet.org>
Sent: Tuesday, May 11, 2010 2:39 PM
Subject: Re: [GMCnet] furnace choices
> Wrong link, sorry
>
> http://picasaweb.google.com/lh/photo/i_5Y35xbB0HX2EBk-3JMFw?feat=directlink
>
> Thanks
>
> Gary and Joanne Worobec
> 1973 GMC Glacier
> Anza, CA
>
>
> ----- Original Message -----
> From: "Gary Worobec" <gtw5@earthlink.net>
> To: <gmclist@temp.gmcnet.org>
> Sent: Tuesday, May 11, 2010 2:38 PM
> Subject: Re: [GMCnet] furnace choices
>
>
>> Hi,
>> I used the same furnace in my '23 mounted on the floor under the fridge.
>> I
>> found the angle of the outside skin of the coach to be too much to get
>> what
>> I felt would be a good seal so built a wedge shaped box and then mounted
>> the
>> exhaust vertical in it.
>>
>>
>> <table style="width:auto;"><tr><td><a
>> href="http://picasaweb.google.com/lh/photo/i_5Y35xbB0HX2EBk-3JMFw?feat=embedwebsite"><img
>> src="http://lh6.ggpht.com/_UyAfvrvL3Y0/S-nNs7IlvwI/AAAAAAAABSs/CE1i41G10d8/s144/IMG_1129.JPG"
>> /></a></td></tr><tr><td style="font-family:arial,sans-serif;
>> font-size:11px;
>> text-align:right">From <a
>> href="http://picasaweb.google.com/GaryTWMW/Heater?feat=embedwebsite">heater</a></td></tr></table>
>>
>>
>> Thanks
>>
>> Gary and Joanne Worobec
>> 1973 GMC Glacier
>> Anza, CA
>>
>> ----- Original Message -----
>> From: "Ray Erspamer" <78gmc-royale@att.net>
>> To: <gmclist@temp.gmcnet.org>
>> Sent: Tuesday, May 11, 2010 1:59 PM
>> Subject: Re: [GMCnet] furnace choices
>>
>>
>>>
>>> I replaced my furnace with a low profile Suburban, it works incredible
>>> and the only thing on the outside of the coach is an intake and exhaust
>>> place about 3" x 6". You can see it in the picture at the attached
>>> link.
>>>
>>> VERY EASY INSTALL!
>>>
>>>
>>> http://www.rvcomfort.com/suburban/products/furnaces/sf.php
>>>
>>>
>>> Ray & Lisa Erspamer
>>> 78 Royale Center Kitchen
>>> TZE368V101144
>>> Wauwatosa, Wisconsin 53226
>>> Email: 78GMC-Royale@att.net
>>> 414-745-3188
>>> Web Site: http://ray-lisa.page.tl/
>>>
>>>
>>>
>>>
>>> ________________________________
>>> From: KB <kab7@sonic.net>
>>> To: gmclist@temp.gmcnet.org
>>> Sent: Tue, May 11, 2010 12:06:29 PM
>>> Subject: [GMCnet] furnace choices
>>>
>>> Has anybody here installed an Atwood furnace? Is it possible to make
>>> the
>>> exterior face
>>> on these match the angled side of the body (maybe a bit of sheet metal
>>> work?)?
>>>
>>> I'm thinking of upgrading from our original furnace. Newer ones are a
>>> lot
>>> smaller and
>>> hopefully more efficient. Space in a 23' is at a premium. I'm thinking
>>> the exterior access
>>> of the Atwoods might be easier to live with and design around. Any
>>> thoughts?
>>>
>>> thanks,
>>> Karen
>>> 1973 23' Patience Tester
>>> _______________________________________________
>>> GMCnet mailing list
>>> List Information and Subscription Options:
>>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>> _______________________________________________
>>> GMCnet mailing list
>>> List Information and Subscription Options:
>>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>
>> _______________________________________________
>> GMCnet mailing list
>> List Information and Subscription Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
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| Re: [GMCnet] furnace choices [message #84129 is a reply to message #84087] |
Tue, 11 May 2010 19:05 |
idrob
Messages: 645
Registered: January 2005
Location: Central Idaho
Karma: 0
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Senior Member |
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| kdpotato wrote on Tue, 11 May 2010 11:27 |
I think the Atwood Everest (inside mount) are the most energy efficient in terms of battery draw,
but about 20K btu seems to be the biggest one which might not be enough. Most other furnaces use
a lot more power. Every new furnace I've seen is much smaller physically than the old one, thank goodness.
Which makes me wonder: how 12-volt efficient the old ones are with a pilot instead of a spark ignition?
Has anyone measured this?
thanks,
Karen
1973 23' Patience Tester
|
One thing to think about is just how large a furnace you really need (Btuh). The lower output ones have smaller fans and draw less current from your battery. I just put a new 16k unit in a 20' travel trailer I have and it only takes 3.5 amps to run, which is reasonably low. Most of the 30k units take in the range of 7 amps or a bit more and eat into batteries pretty fast. If you are not camping in very cold climates you probably will find that a small output furnace will be just fine. Your 23' does not really need a large furnace output. I had a 32' Airstream motorhome that came with a 34 k furnace which used 7 to 8 amps to run. I replaced it with a 24k unit which took under 4.5 amps and kept me warm down to 16 F, the coldest I camped with it.
One thing I have found is that some of the newer units are very noisy. The low current draw 16k in the travel trailer I mentioned above is annoyingly loud. I have no way to predict that noise level. Suburban, especially, seems to have cheapened their furnace blowers at the expense of noise, and not changed the furnace model number or rating. So, what someone has been happy with in the past (from the noise standpoint) may or may not be what you will get today, even with the same model number.
Be sure to put enough ducts on whatever you wind up with. Too few ducts, or too small an area of output makes the furnace run longer to heat the coach, and longer on the cool down cycle, all which makes the batteries go down faster than necessary.
No real solutions here, just observations and suggestions of things to consider.
Rob Allen
former owner of '76 x-PB
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| Re: [GMCnet] furnace choices [message #84207 is a reply to message #84078] |
Wed, 12 May 2010 11:40 |
KB
Messages: 1262
Registered: September 2009
Karma: 0
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Senior Member |
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> One thing to think about is just how large a furnace you really need (Btuh).
> The lower output ones have smaller fans and draw less current from your battery. I just put a new 16k unit in a 20' travel trailer
> I have and it only takes 3.5 amps to run, which is reasonably low. Most of the 30k units take in the range of 7 amps or a bit more
> and eat into batteries pretty fast. If you are not camping in very cold climates you probably will find that a small output furnace will be just fine.
> Your 23' does not really need a large furnace output. I had a 32' Airstream motorhome that came with a 34 k furnace which used 7 to 8 amps to run.
> I replaced it with a 24k unit which took under 4.5 amps and kept me warm down to 16 F, the coldest I camped with it.
That is a good question: how big a furnace is "big enough"? Probably a lot of variables, but
I haven't seen any hints on sizing a furnace. Thanks for your observations.
Not only are smaller furnaces more efficient in terms of power draw, they're also cheaper to buy.
Noise is bad though -- can't stand noisy stuff. If you don't mind telling, what brand/model was the 16K noisy unit??
thanks,
Karen
1973 23' Patience Tester
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Karen
1975 26'
San Jose, CA
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| Re: [GMCnet] furnace choices [message #84221 is a reply to message #84078] |
Wed, 12 May 2010 13:19 |
KB
Messages: 1262
Registered: September 2009
Karma: 0
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Senior Member |
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> I installed an Atwood and angled the front to fit the exterior face. I also
> used the flush mounting kit which makes for a nice looking installation. I
> presented a short paper on this upgrade at an Eastern States Rally. Go to
> http://www.gmceast.com/technical/technical/synopses.html , scroll down and
> click on Horizontal Installation of Atwood Furnace for a pdf file.
Wow, thanks Ray! I should have known somebody around here would not only have done it,
but also written a great presentation about it!! I've been spending a lot of time
with your TBI paper too.
Thanks!!
Karen
1973 23' Patience Tester
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Karen
1975 26'
San Jose, CA
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| Re: [GMCnet] furnace choices [message #84241 is a reply to message #84214] |
Wed, 12 May 2010 15:27 |
Ray Erspamer
Messages: 1707
Registered: May 2007
Location: Milwaukee Wisconsin
Karma: -3
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Senior Member |
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VERY NICE INSTALLATION !!!
Ray
Ray & Lisa Erspamer
78 Royale Center Kitchen
TZE368V101144
Wauwatosa, Wisconsin 53226
Email: 78GMC-Royale@att.net
414-745-3188
Web Site: http://ray-lisa.page.tl/
________________________________
From: Ray Swartzendruber <redruber@gmail.com>
To: gmclist@temp.gmcnet.org
Sent: Wed, May 12, 2010 12:25:29 PM
Subject: Re: [GMCnet] furnace choices
I installed an Atwood and angled the front to fit the exterior face. I also
used the flush mounting kit which makes for a nice looking installation. I
presented a short paper on this upgrade at an Eastern States Rally. Go to
http://www.gmceast.com/technical/technical/synopses.html , scroll down and
click on Horizontal Installation of Atwood Furnace for a pdf file.
Regards, Ray
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of KB
Sent: Tuesday, May 11, 2010 1:06 PM
To: gmclist@temp.gmcnet.org
Subject: [GMCnet] furnace choices
Has anybody here installed an Atwood furnace? Is it possible to make the
exterior face
on these match the angled side of the body (maybe a bit of sheet metal
work?)?
I'm thinking of upgrading from our original furnace. Newer ones are a lot
smaller and
hopefully more efficient. Space in a 23' is at a premium. I'm thinking the
exterior access
of the Atwoods might be easier to live with and design around. Any
thoughts?
thanks,
Karen
1973 23' Patience Tester
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Ray Erspamer
78 GMC Royale Center Kitchen
403, 3.70 Final Drive
Holley Sniper Quadrajet EFI System,
Holley Hyperspark Ignition System
414-484-9431
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| Re: [GMCnet] furnace choices [message #84308 is a reply to message #84207] |
Wed, 12 May 2010 23:00 |
idrob
Messages: 645
Registered: January 2005
Location: Central Idaho
Karma: 0
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Senior Member |
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| kdpotato wrote on Wed, 12 May 2010 09:40 |
That is a good question: how big a furnace is "big enough"? Probably a lot of variables, but
I haven't seen any hints on sizing a furnace. Thanks for your observations.
Not only are smaller furnaces more efficient in terms of power draw, they're also cheaper to buy.
Noise is bad though -- can't stand noisy stuff. If you don't mind telling, what brand/model was the 16K noisy unit??
thanks,
Karen
1973 23' Patience Tester
|
The 16K unit I purchased was a Suburban NT 16. It replaced a Suburban NT 16 which was still operating, and quiet, but had pilot ignition, and was 35 years old. The old one had a squirrel cage blower. The new one, same size etc. has a propeller fan with an annoying whine.
In general, for quiet, I would look for a smaller furnace size, and a squirrel cage blower, but even then a few years ago I put a new Suburban NT16 in another RV and it had a squirrel cage blower and it too is noisy in comparison with the original one. So no guarantees at all. It seems to depend on what fan unit they are putting in this year.
Not the best answer, but the only one I can give you.
Rob Allen
former owner of '76 x-PB
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| Re: [GMCnet] furnace choices [message #84337 is a reply to message #84308] |
Thu, 13 May 2010 08:16 |
Ray Erspamer
Messages: 1707
Registered: May 2007
Location: Milwaukee Wisconsin
Karma: -3
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Senior Member |
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My son and I camped last fall and it got down to 23 degrees one night.......we have the new Suburban SF30 in the coach. It was big enough.....ran a lot, but kept us nice and warm. Now that I have the duct from the furnace to the rear bedroom "UN-CRUSHED", I suspect it will be even better.
Ray
Ray & Lisa Erspamer
78 Royale Center Kitchen
TZE368V101144
Wauwatosa, Wisconsin 53226
Email: 78GMC-Royale@att.net
414-745-3188
Web Site: http://ray-lisa.page.tl/
________________________________
From: Rob Allen <profmail@wildblue.net>
To: gmclist@temp.gmcnet.org
Sent: Wed, May 12, 2010 11:00:43 PM
Subject: Re: [GMCnet] furnace choices
kdpotato wrote on Wed, 12 May 2010 09:40
> That is a good question: how big a furnace is "big enough"? Probably a lot of variables, but
> I haven't seen any hints on sizing a furnace. Thanks for your observations.
>
> Not only are smaller furnaces more efficient in terms of power draw, they're also cheaper to buy.
> Noise is bad though -- can't stand noisy stuff. If you don't mind telling, what brand/model was the 16K noisy unit??
>
> thanks,
> Karen
> 1973 23' Patience Tester
The 16K unit I purchased was a Suburban NT 16. It replaced a Suburban NT 16 which was still operating, and quiet, but had pilot ignition, and was 35 years old. The old one had a squirrel cage blower. The new one, same size etc. has a propeller fan with an annoying whine.
In general, for quiet, I would look for a smaller furnace size, and a squirrel cage blower, but even then a few years ago I put a new Suburban NT16 in another RV and it had a squirrel cage blower and it too is noisy in comparison with the original one. So no guarantees at all. It seems to depend on what fan unit they are putting in this year.
Not the best answer, but the only one I can give you.
--
Rob Allen
former owner of '76 x-PB
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Ray Erspamer
78 GMC Royale Center Kitchen
403, 3.70 Final Drive
Holley Sniper Quadrajet EFI System,
Holley Hyperspark Ignition System
414-484-9431
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| Re: [GMCnet] furnace choices [message #84363 is a reply to message #84308] |
Thu, 13 May 2010 09:22 |
druber
Messages: 58
Registered: March 2004
Location: Syracuse, IN
Karma: 0
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Member |
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Depends on how you plan to use it. We put in the smallish 20K unit and it
has been more than adequate. However, we make it a point to not camp in
weather that could get below 25 degrees (don't want water freeze ups), and
we only keep the coach no more than 60 degrees when doing so. Under those
guidelines, the 20K has been more than adequate. When it comes on, it runs
for a while, rather than the short cycling hot blasts we would get from a
larger unit. To each his own....
Druber
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Rob Allen
Sent: Thursday, May 13, 2010 12:01 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] furnace choices
kdpotato wrote on Wed, 12 May 2010 09:40
> That is a good question: how big a furnace is "big enough"? Probably a
lot of variables, but
> I haven't seen any hints on sizing a furnace. Thanks for your
observations.
>
> Not only are smaller furnaces more efficient in terms of power draw,
they're also cheaper to buy.
> Noise is bad though -- can't stand noisy stuff. If you don't mind telling,
what brand/model was the 16K noisy unit??
>
> thanks,
> Karen
> 1973 23' Patience Tester
The 16K unit I purchased was a Suburban NT 16. It replaced a Suburban NT 16
which was still operating, and quiet, but had pilot ignition, and was 35
years old. The old one had a squirrel cage blower. The new one, same size
etc. has a propeller fan with an annoying whine.
In general, for quiet, I would look for a smaller furnace size, and a
squirrel cage blower, but even then a few years ago I put a new Suburban
NT16 in another RV and it had a squirrel cage blower and it too is noisy in
comparison with the original one. So no guarantees at all. It seems to
depend on what fan unit they are putting in this year.
Not the best answer, but the only one I can give you.
--
Rob Allen
former owner of '76 x-PB
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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