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-   -   York vs Rheem furnace venting (http://www.diychatroom.com/f17/york-vs-rheem-furnace-venting-115692/)

raylo32 08-30-2011 06:36 AM

York vs Rheem furnace venting
 
Still researching options for a 95% furnace upgrade. It needs to be a 33 or 34" height and I have found that in York and Rheem models (and possibly Coleman/Hamilton). I had looked into the York in detail and just yesterday looked at the literature for the Rheem and found a contrast in venting approach.

The York was very straightforward with 2" PVC allowed for reasonable runs on up to 100k units. The Rheem, however, had a table that showed only 3" for the 75k unit I was interested in and above. But to confuse matters the text said IF you use a 3" pipe from the furnace" then you needed to add a short section of 2" or 1 1/2" near the ende to maintain velocity. I understand the velocity bit. I don't understand the "if you use 3 inch pipe" part. The table implies you MUST use 3".

Anyone ever installed one of these Rheems? Is 3" really the only option for venting? Not sure because the manual seemed to be poorly written in that regard. In another place the manual said "Do not install under a deck. if you do install under a deck insulate the pipes...etc.". Makes no sense. They say "do not" in one sentence then in the next tell you how to do it. Oh well.

Model I am interested in is the RGRM07MAES listed here:

http://globalimageserver.com/fetchDo...5-be38a4c014e0

raylo32 08-30-2011 07:01 AM

Oh, I think I answered my question. The install manual also covers a couple of smaller models that do allow 2" pipe vents for short runs. The passage could have been written more clearly.

Oh well, 3" vents would make my tough vent install even more problematic so I guess the Rheem is off my list.

hvactech126 08-30-2011 07:07 AM

the coleman and hamilton are both made by york

raylo32 08-30-2011 07:46 AM

I thought the format for their manuals looked familiar. I need to look more closely at what they have available.

Do you know what is different about the Rheem that they require larger vent sizes for the mid-size units? Do they have less powerful vent motors? The Rheem was interesting to me since it came in a size (71k output) that better fits my needs. The Yorks are 80/78 and 60/58 in/out and the Rheem was pretty much in the middle at 75/71.

Quote:

Originally Posted by hvactech126 (Post 717723)
the coleman and hamilton are both made by york


hvactech126 08-30-2011 11:43 AM

Completely different units ..... each manufacturer has done testing to know what is required for their units to operate within the specs they need. If it calls for larger venting it must be used.

raylo32 08-30-2011 12:53 PM

I know the specs must be followed... just curious about what exactly is different. The Rheem venting requirements seemed to be significantly more restrictive and complex compared to the York and I wonder why it would get built that way if there are more simple and efficient designs that also have the effect of making installation easier.

Quote:

Originally Posted by hvactech126 (Post 717854)
Completely different units ..... each manufacturer has done testing to know what is required for their units to operate within the specs they need. If it calls for larger venting it must be used.


hvactech126 08-30-2011 05:28 PM

It is the design of their heat exchanger and vent motor.


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