Well, thank you for reading my post and cheery picking my statements.
From Modines own manual I found the following:
Installation must conform with local building codes or in the
absence of local codes, with the National Fuel Gas Code,
ANSI Z223.1 (NFPA 54) - latest edition. In Canada,
installation must be in accordance with CSA-B149.1.
It does not say get the owners manual from your 1999 unit heater and follow everything it says in regards to installation requirements and ignore all local and national codes..... I suspect it has said this for years as any manufacture knows that codes take presence.
If you noticed, my post said " I think" and "you might", I did not say you are an idiot and must do it the way I did "last Fall" when I did mine.
I also did not say use any OLD instructions he found online, I suggested he check the manufacturers web site for the latest instructions - my simple logic would lead me to look up the instructions for the model he has. Codes and requirements change. I have no idea what the vintage of that heater is and it really does not matter, this is a new installation and should be done to the latest code requirements.
Your wisdom and overseeing knowledge have taken me to task and I'll quietly bow out now. Thanks for the constructive input - not.
As I said above, the "latest" instructions would be the wrong instructions, unless his unit was manufactured today.
lf I read the latest instructions for my Ruger, I'd be inclined to think that it has a loaded chamber indicator, when it most certainly does not (as it predates that feature).
The ONLY correct instructions are the ones printed that go with a serial number range that matches his unit. Period. The manufacturer should be able to supply these.
The point is, that this heater is a UL Listed appliance. In order to maintain that rating (which is the ONLY thing an insurance company when handling a claim will care about, unlike what was said some comments above), the correct instructions must be followed to the letter.
My unit has sealed combustion, and there are clear instructions about how the intake can be placed with respect to the exhaust. These instructions (perhaps the "latest", perhaps not, I couldn't say for sure) would be quite misleading to the OP.
As for your reference to National Fuel Gas Code, et al, they are immaterial. The manufacturer's instructions will tell you how to install the appliance to maintain that UL rating. It is up to the installer to follow necessary code to provide gas and electrical supplies, as these are outside the scope of the appliance itself. That is why the instructions reference them.
The venting is an interesting subject, because it may, or may not be part of the appliance. In the case of any single wall tube, it is covered under the manufacturer's instructions. The manufacturer allows for that single wall tube (at least in my unit's instructions) to be vented out a wall, so long as you maintain the proper 6" gap. It's not a path most users would want to take, but might make sense in say a greenhouse application.
They also allow for connecting to B vent, but once you add that, you've added a separate UL rated system, and now you need to follow the B vent (or wall thimble) manufacturer's instructions too.
