Manometer dwyer will it do what I need it to do and how do I set

Jim Davis_3

Draft has several functions on all equipment. Draft is probably critical here to keep from smoking up the building. But also draft is important in getting the coal to burn hot and completely. Don't want it to burn too fast or too slow. If there are alot of big clinkers it is burning too slow and incompletely. This usually means the draft door under the coal is closed too far and the top one too much. But the main answer is, yes draft is very important!

Joe.G

Hi, I am going to be installing a coalboiler in my home soon, I need to adjust the draft in the chimmney and the firebox to either 04 or -04 I am sure at this time, I just ordered this gauge, (link at bottom) I was wondering if I got the right one and how do I use it, I would like to check my peerless oil boiler also which i beleive calls for -04 thanks alot model 25

http://www.dwyer-inst.com/Products/Product.cfm?Group_ID=260&Product_ID=498&sPageName=Intro

Brad White_194

Magnahelics

The gauges do come with detailed instructions but here are the basics.

You are not setting this up as a permanent installation so you want to drill a test port, usually 1/4". (You can get screw-cap fittings to make this a first class job- Lawson-Taylor is one company BTW).

(Dwyer also makes brass nipple fittings but these are usually for permanent installations. They way work if the sheetmetal is thick enough and are sealed with high-temperature sealant.)

You also need a Pitot tube if you use the drilled hole method. Some rubber tube of course to connect everything.

The Dwyer gauges have a low pressure port and a high pressure port (negative and positive pressures respectively). The Pitot tube wants to aim downstream to read static, mot total pressure.

Set the gauge up dead-level and calibrate to zero.

A bit more to it than that, but those are the basics.

Joe.G

IS this a fairly accurate gauge? or would I have been better off getting a digital one for a more money?

Joe.G

IS this a fairly accurate gauge? or would I have been better off getting a digital one for a more money?

mtfallsmikey

Yes it is!

Dwyer is the Cadillac, at least as far as I'm concerned...should still be able to order one backlighted if you wish.

Jim Davis_3

Dwyer is accurate but I don't think you have a guage that will read as low as -.04". Looks like the ones in the picture might read -.4". Would have been better off with a Dwyer 460 Air Meter. Inexpensive and easy to read. Best draft guage for most residential applications.

The draft at the outlet is adjusted by the barometric. If you can't get -.04" draft you have a combustion air problem. The overfire will be determined by how much coal there is and how clean the equipment might be.

Joe.G

Jim I think that it goes down to -05

Jim Davis_3

Trying to set something up at -.04" when the lowest reading on the guage is slightly higher is tough. You may not be sure the fluid is actually moving. A guage that can read in increments of .001" would be more descriptive and understandable.

realolman

It has

been my experience with a coal boiler that you can't beat it when the temperature is 10 below zero, but other than that, the only time it's 72° indoors, is when it's on it's way up past it, or on it's way down past it.

Is it possible, or necessary to set the draft all that accurately?

Brad White_194

Yeah, I missed that...

the low range. For low ranges I have a Dwyer 477-3 digital manometer which can read mouse flatulence during a hurricane.

Four times the cost of a Magnahelic though.