Mobile Home Furnace Question......................(Starch)

Mitch_4

I usually do rooftop units onthe side of the mobile home, especially if they have no A/C, and convert the furnace space to a new pantry / clost.

John Starcher_4

Does anyone know.....

....if anyone makes a mobile home furnace that vents in just B-vent? I need to price up a replacement for a Miller natural gas unit, and installing the typical Coleman roof jack will be darn near impossible due to an added-on roof.

Thanks,

Starch

Jeff Lawrence_24

Idea?

Have you thought about using a package unit?

I used to do a lot of 'conversions' from the built in system to installing a gas fired or heat pump package unit. With the current minimun SEERs, there may be a bit of a problem with airflow and static pressure, but it may be worth considering.

Ed_26

MH furnace

Why not an Intertherm high eff. unit? Vents w/plastic, AC as an option. Apparently others make one too. (thermopride etc.)

Tony_23

The easiest way

is to replace like brand with like brand. I don't have any problems with "roof-overs", Sawzall, plumbob, installer's bit make it easy

You could put in an approved 90%er.

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jim lockard

john

correct me if I am wrong but does not the Miller furnace have a pipe in a pipe exhaust system to pull fresh air in and combustion air out?
I would replace like with like if you cannot how about using a counter flow Trane or A/S 90 plus furnace (2 pipe).
Both are moblie home rated a Trane furnace is 28 inches deep where the Miller is about 20 inches (I think) Best Wishes J.Lockard

Ron Schroeder

Jim

Yes tyhe newer models do however the CMF models pull supply from under the mobile

Bruce

S Ebels

Starch

Go here.

http://www.thermopride.com/pdfs/GasMobileHome_Lit.pdf

Then call them up Monday and ask about venting options. I think it'll fit your application. It's the only mobile home furnace I know of that is built like a regular residential unit. Very good piece of equipment that will likely outlast the home.

1-800-348-5130

Tony_23

Others

Trane, AmStd, Carrier/Bryant all also have HUD approval for MH installation (with a kit) on their 90%ers

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jim lockard

thanks

Alot of strange beasts in the mobile home market. J.Lockard

joeoilman

use the m3 model. there's a kit to pvc vent thru the old roof jack. nice furnace. parts compatable with residental units.

John Starcher_4

Thanks, everyone.......

....for the responses.

Jeff - I'm not a big fan of package units. I've seen too many problems with condensation backup and moldy fan chambers.

Steve- I wondered about the thermopride. I'll definitely check them out.

I am going to propose an American Standard high efficiency unit, but I wanted to give my client the option of another mobile home unit, too.

The existing furnace is a CMF model, with just a single vent pipe configuration and combustion air coming from underneath.

Thanks again, all.

Starch

B. Tice

MH

Starch, I don't understand the problem..?...A typical Miller CMF/Thermopride roofjack comes long enough to fit any roofover situation. The SRJ-1 for example is 4FT. long. How was it extended in the present deal?

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Tony_23

???

SRJ-1 is 1 ft long, SRJ-2 = 2ft, etc. up to SRJ-5.

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John Starcher_4

It's in B vent right now.

Not a problem if I can put in a MH furnace that DOESN'T need a special roof jack. Getting the existing roof flange out is what scares me.

I talked to the guy again this morning, and it sounds like he's leaning toward the hi efficiency American Standard unit anyway, so the point is probably moot.

Thanks,

Starch

S Ebels

I feel your pain..........

If anyone has a good solution to Starch's problem, I'd like to hear it too. What he's dealing with is this..........Typical mobile home furnace installed with a factory roof jack. The HO hires one of these "roof over" companies that just come in and slam an inch of foam and new ribbed steel over everything. Now you have the existing flashing covered by a new roof which is nearly impossible to get a new flashing to seal up on. It's a royal pain in the butt. I haven't seen a solution that I would consider leakproof yet. Sawzall surgery doesn't work because when you cut out the the old flashing you are taking the roof, insulation and new steel with it. The fact that the new steel is usually a standing rib design complicates matters even further. NOT FUN!!!

John Starcher_4

Thanks, man.....

....for describing it so well when I wasn't able to!!!!!

Starch

Joe Grosso

Oops

Sorry Tony, I screwed up and hit the wrong button. You are correct.

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Joe Grosso

Roofjacks

Well, here is what I do with older roof-overs- ones that originally had like a MMG in there, with the old 5" jack. We need a seamless connector for a trailer, right? So, I take the appropiate length of 4"diameter 316-L flexible stainless steel chimney liner and go from the top of the CMF or Thermopride and go right to the top of whatever pipe deal they got.Presto, instant seamless venting. However, if the roof-over is with a newer 4" roofjack home, I don't know what I'd do, I guess back to square 1. I have done the other method for 20 years, never a problem.

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