mr heater big maxx install help

[12gauge]

I ordered the 75K mr heater big maxx & horizontal vent kit. the exit pipe is 2" diameter & there is 2" to 4" adapter that came with the heater. But nothing seems to really fit right from the vent kit?

which piece is supposed to fit to what? nothing really seems right. the adapter that came with the kit is 3" to 4".

I have the heater close to the wall, so i just need to run only the double wall pipe that came with the kit. but it wont mount to the adapter.

 

[riskyvt]

Let me try to help with your issues: The 2" to 4" adapter came with the furnace, and it goes directly onto the output tube of the powered exhaust fan. This will convert the 2" output tube to a 4" exhaust pipe. Your horizontal kit came with a 36" section of b-vent (the double-walled pipe) and two 36" sections of traditional stove pipe with the "click together" seams, plus a thimble & cap. The 4" to 3" adapter doesn't need to be used in your application. Oh, you should also have a 4" elbow fitting.

On my Mr. Heater BIG MAXX 75K heater installs I used the 2-to-4 adapter, the 90-degree elbow, the 36" piece of b-vent, the thimble and exterior cap. My propane installation tech sealed all the fittings up with self-tapping sheetmetal screws and high-temp RTV.

You have all the pieces necessary. Check out my running thread in the Gallery, some of the later pictures are shots of my Mr. Heater exhaust tubing: http://www.garagejournal.com/forum/showthread.php?t=11929

 

[12gauge]

i'm not using the 90, so maybe that is the diffference. it looks like the only way i could make the b-vent fit the 4=2 adapter would be to cut out back the outer pipe or cut the heater itself. the vent is net centered worth a darn in mine.

 

[ratpowered]

t
The 2-4 adapter is not centered also- made to rotate around so it can center.
The adapter will attach to the inner tube only of the double wall pipe.
I only bought the heater from NT and bought the pipe, 90 elbow, cap, etc from a local HVAC installer- much cheaper than the NT kit- that way I only bought what I needed

 

[12gauge]

this is is exactly what i needed & used. i ended up finding this on my own. but hopefully this will help someone else when buying the mr heater.

you need one of these to connect from the adapter to the B-vent
http://www.lowes.com/lowes/lkn?action=productDetail&productId=561-41698-104240R&lpage=none

 

[lokelani]

Let me try to help with your issues: The 2" to 4" adapter came with the furnace, and it goes directly onto the output tube of the powered exhaust fan. This will convert the 2" output tube to a 4" exhaust pipe. Your horizontal kit came with a 36" section of b-vent (the double-walled pipe) and two 36" sections of traditional stove pipe with the "click together" seams, plus a thimble & cap. The 4" to 3" adapter doesn't need to be used in your application. Oh, you should also have a 4" elbow fitting.

On my Mr. Heater BIG MAXX 75K heater installs I used the 2-to-4 adapter, the 90-degree elbow, the 36" piece of b-vent, the thimble and exterior cap. My propane installation tech sealed all the fittings up with self-tapping sheetmetal screws and high-temp RTV.

You have all the pieces necessary. Check out my running thread in the Gallery, some of the later pictures are shots of my Mr. Heater exhaust tubing: http://www.garagejournal.com/forum/showthread.php?t=11929

I am trying to do the same installation and have a question regarding the gap I'm seeing in the connection from the 2-4 adapter into the 90 elbow. Even if I screw this in two spots there is still going to be about a 1/8" gap in all the other areas. This doesn't seem safe or correct.

How did this look for you or how did you resolve this issue?

 

[troublemaker427]

I just installed my Mr.Heater with the horizontal vent kit. There seems to be alot of gap between the pipe and thimble where it goies out threw the wall. I can actually see daylight around the outside of the pipe. Is this normal/ok? Should I seal this up and if so with what? Hi temp silicone?

 

[Red Green]

On mine I just put a sheet metal screw in the pipe so it wouldn't fall apart. The exhaust is pushed by a fan so the gases are forced into the pipe. I have not had any problems.

 

[smitty7611]

I noticed the same thing. I am going to put a finishing plate on the outside , then RTV silicone it.

Smitty