Anyone Ever install a Williams Monterey Furnace before?

fulmar2

Has anyone installed a Williams "Monterey" Furnace - model 2509622? In the instructions (Figure 14) they show gas piping configurations - however I do not see how any of these arrangements are physically possible with the gas coming in from the stud wall.


In the instructions (Figure 5), the Alternate Gas stub location is 4" above the sill plate.


So, how does this fit in with Figure 14? I need for the shut off valve to be in an unconcealed space, and with the 3" sediment trap, there simply is not enough room underneath the furnace to fit it all! I've been looking online for a photograph of a properly installed wall furnace, and cannot find one.

In (Figure 24) they have a drawing of a Drip Leg (which differs from a sediment trap).
According to the UPC (which I am under), I need to install a sediment trap (like is shown in Figure 14) NOT a drip leg (As is shown in Figure 24).

I could possibly install the heater in the configuration shown in Figure 24... But it would still not be possible to use rigid pipe from the ground joint union to the gas valve because the female portion for the gas valve sticks out into the room a few inches. In other words, it is not a straight line from the hole in the stud to the hole in the gas valve. I think I'm allowed to use flexline, though - so that is why I could possibly do the install in Figure 24... but is it correctly installed if I do it that way?

Any help you can give me with this installation would be great!

gregzoll

It is called getting a licensed plumber in that can do the gas piping for you legally, not some hacked together solution.

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fulmar2

Hi Gregory -
Sorry, your reply was not helpful. My permit is "owner builder," and I looked up the rules on "owner builder." As an owner builder, you are legally allowed to work on your own gas piping. My final installation will not be a hacked together solution, but instead a permitted and inspected installation. I came to DIY Chatroom for some help doing that, and to make absolutely certain that I have followed all of the rules before I call the inspector to come out. I assume you do not have any constructive input - but if you do, I'm still open to it!
Thanks!

kirwinjd

I've installed numerous Williams wall heaters and many times a drip leg wasn't required especially if the gas supply line rose vertically through the floor. Double check your local code to see what they require. The installation manual I believe uses national codes which may not be accurate or required by local codes.

fulmar2

Thanks, kirwinjd.
We're under the UPC, and I did read in Chapter 12 that a "sediment trap" is required - they even have a picture of it that looks like the configurations in Figure 14. I did more research online, and determined that a "drip leg" is not the same as a "sediment trap." I need a "sediment trap." So, now the question is: how to I accomplish that when coming in from the stud wall? I've got 4 vertical inches to work with. Hmmm...

gregzoll

I get a owner Builder allowance also when working on my home, but it still does not make me a licensed hvac specialist, or the ability to be a expert in gas piping.

The key is, if you do not know what you are doing, even though you have the instructions in front of you, you call in the experts. As for the location of the drip leg, depends on how the gas piping is run, and if the framing was not put up to take in consideration of that wall heater you are putting in, you will have to make some changes to make it work.

But still take it from someone who knows their limits, call in an expert to do the gas piping. More diyers messing with gas appliances have caused homes to blow up, than experts that do this stuff on a every day basis.

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carmon

Those instructions you are reading would mean absolutely nothing where I am from...... must follow the B.149..

fulmar2

Hi Carmon - Well, I've read the UPC too. I see what I need to do according to the UPC - so perhaps I should just ignore the part in the instructions that says to set the feet of the furnace on the sill plate. I went over and looked at an installed one (same county), and they raised it up a few inches higher than my instructions say to. This would fix the issue of the sediment trap not fitting (interestingly, the installed one I looked at did not have a sediment trap or drip leg - but it was put in several years ago).

kirwinjd

For what it's worth, I've repaired countless Williams wall heaters and I've yet to see one that had a drip leg or sediment trap. I'm not suggesting that these were all installed properly or improperly. But because of the tight working space, it seems that the building inspectors in my area over look that requirement.

fulmar2

Kirwin - Thanks for your helpful comment. That is good information to have. I think I'm going to just move the heater up a few inches to accomodate the sediment trap. The manual says a minimum ceiling clearance of 16", which is easily attainable. It frustrates me that the diagrams they show in the manual are physically impossible to assemble. I think that I have the best chance of pleasing my inspector if I add the sediment trap. Thanks again!