Questions for Glenn Stanton

Jackchips

I am installing a Burnham LEDV2 for a niece and am piping it exactly as "Pumping Away" lays out. I have some questions if you don't mind. The supplier was not clear when ask.

There is a 1" tapping on the top of the boiler-can this be just capped off with a nipple and a cap?

Is a fresh air supply required if the boiler is in an open basement? It appears that only the exhaust with the Z flex is required in this application. This was the advice from my supplier.

What is the "washout" for at the connection to the return on the bottom of the boiler. I put an 11/4" tee with a nipple and cap on the horizontal and an 18" nipple to run the return up the back of the boiler. I then put an 11/4" x 3/4" x 11/4" tee with a 3/4" draw off.

It's great for folks like me who have not done this since boilers have changed so much to have this resource. Thanks to Dan and especially you, in advance.

Jack

Bob Bona_4

before

Glenn gives us the authoritive answers, Jack, here's my experiences with the LEDV-done quite a few.

I've never used the 1" tapping. I plug it off and take all supply/Spirovent, etc. off the main 1 1/4" tapping.

I have one LEDV running now in kind of an unusual situation where the Z flex had to be a little exposed to outdoor temps. I needed to disconnect the outside air so the burner would draw some tempered air from the basement. The goal was to get some warmer combustion air into the unit to establish some sort of draft ASAP-like I said, the Z flex wasn't in totally warm climes like it should be..this resulted in tough light-off. Unorthodox install blessed by my Burnham rep:).

I would and have used the outside air boot for all the other installs. Big, big noise reduction, and now the burner doesn't have to rely on infiltration for combustion air.

Off the bottom of the boiler I use a 4" nipple, elbow, and a 14-16" nipple to get the pipe out from under the boiler. Then I put a T on with the boiler drain, and the branch of the T heads up to the return, or to another T for the bypass, if you are connecting it there.

Which brings me to the bypass. Very important to minimize short cycling, low water return temps, etc. Being a steel boiler, low water temps will cause the bottom turbolators to corrode and seize in the fire tubes-bad, bad stuff..

The AF2's nozzle spec and burner setting must be followed to the letter. I think you'll like the final result!

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Unknown

Jack

The 1" tapping on the top of the LEDV is there to provide an otional place for an air vent or as a connection for a basement expansion tank if neccessary in lieu of diaphram type tank. In most cases this will be capped off if an air elimination device is used. The washout is just that, a place to wash out the lowest part of the cylindrical shaped heat exchanger if the boiler happened to be connected to an older system with debris or sludge. In most cases, the 1-1/4" x 3/4" x 1-1/4" tee with a boiler drain will certainly do the trick. Be sure to install the system bypass as we show in the manual. This will keep fairly equal temperatures within the heat exchanger at all times and will certainly make it easier to clean later on.

As far as venting and air intake is concerned, it is advisable to always use the intake air to the burner. I have been on many jobs where the air was drawn from the basement where tight construction was prevalent and in every case, intake air had to be installed to correct the adversities that arose. This involves simply taking off the cover on the right side of the burner and piping the intake air with smooth metal pipe. We provide an intake elbow with screen and a 4" relief damper that will introduce basement air in the event of the intake elbow becoming blocked for some reason. Intake and exhaust must be on the same side of the building in order to provide balanced conditions for the burner. And yes, this boiler is only approved for installation with the Z-Flex vent system. You can select a length of pipe in increments of 5, 10, 15 and 20 feet and do not cut the pipe. Hope this helps.

Glenn Stanton

Burnham Hydronics

Jackchips

Yes it does

Glenn. Thank you and thanks to Bob for his comments.

Jack