Dwyer Mark II Manometer Questions

guysnydr · Post by **guysnydr** » Fri. Mar. 03, 2017 10:17 am

Here is a pic that I took earlier this morning. The weight is set at around 5. I can look at it closer when I get home tonight to be sure though. It's not a great picture of the exact setting

Post by **coaledsweat** » Fri. Mar. 03, 2017 10:30 am

The weight appears to be on the wrong side of the mount to me.

lsayre · Post by **lsayre** » Fri. Mar. 03, 2017 10:40 am

I must admit that I've often been confused as to the reasoning between the significance of weight right vs. weight left, wherein I can't seem to fathom any difference merely from a logical perspective.

Short version: I need an education and some sound science here.

guysnydr · Post by **guysnydr** » Fri. Mar. 03, 2017 11:00 am

Yes, that makes two of us. I'm a pretty mechanically-minded fella and I can't wrap my head around why it would matter either. Hopefully someone can explain and shed some light for us.

Post by **coaledsweat** » Fri. Mar. 03, 2017 11:01 am

lsayre wrote:I must admit that I've often been confused as to the reasoning between the significance of weight right vs. weight left, wherein I can't seem to fathom any difference merely from a logical perspective.

Short version: I need an education and some sound science here.

If you look at the slots, they have different angles and distance from the plate. I would imagine that it has to do with the difference in the draft's effect on the plate verticle vs horizontal. I assume it is balanced "for the curve" of said draft.

titleist1 · Post by **titleist1** » Fri. Mar. 03, 2017 11:08 am

I always thought which side the weight was on would matter if you went by the #'s on the baro to 'set' it. But if you used a manometer to 'set' to an actual reading then it wouldn't matter which slot the weight went on. But I could be way off!

And if you have it on a diagonal which slot do you use?!?!?! (i think its the vertical?)

Sunny Boy · Post by **Sunny Boy** » Fri. Mar. 03, 2017 11:27 am

coaledsweat wrote:The weight appears to be on the wrong side of the mount to me.

The weight can go on either side of the bracket. The slot and scale on each side are the same on my Field Control RC baro's. Both sides of the bracket are stamped .2, .4, .6, and .8.

Paul

Post by **coaledsweat** » Fri. Mar. 03, 2017 11:29 am

Sunny Boy wrote:
coaledsweat wrote:The weight appears to be on the wrong side of the mount to me.
The weight can go on either side of the bracket. The slot and scale on each side are the same on my Field Control RC baro's. Both sides of the bracket are stamped .2, .4, .6, and .8.

Paul

Read what it says on the label below the weight bracket. Yes, both sides are slotted, however the slots are not in the same orientation.

guysnydr · Post by **guysnydr** » Fri. Mar. 03, 2017 11:38 am

Haha! That is too funny! I never even saw that. I will switch it to the left side and see what happens. It is mounted horizontally

Sunny Boy · Post by **Sunny Boy** » Fri. Mar. 03, 2017 11:45 am

Ok, I see what your saying CS. My bad, I had to look closer to see his pipe is horizontal. Good catch. Yes, the weight should be on the left side of the RC bracket.

Paul

guysnydr · Post by **guysnydr** » Fri. Mar. 03, 2017 12:29 pm

Yep, I will switch it over to the left side tonight.

As for setting my combustion draft. I have the restrictor plate on the combustion blower set 1/2 open and I had a reading of .04. Harman book says to set it at .03 to .04 but I got very little movement out of my manometer with it all the way open, or all the way closed, or at 1/2 open. It did move to .05 when I closed it off all the way but stayed at .04 when it is was open all the way right on up to about 3/4 closed or so. Does this sound right? These measurements are taken with the feed knob on "Test" as per the Harman manual.

This sound right? I guess I was expecting the manometer to move a fair amount depending on where the restrictor plate was set, but it doesn't seem to be changing draft much at all.

Post by **Lightning** » Fri. Mar. 03, 2017 1:38 pm

Yes, that does sound right. The results you've seen on the manometer when you open and close the combustion blower plate make perfect sense. When you open the plate, some of that negative pressure in the stove or flue pipe is satisfied by the incoming combustion air, shown by a weaker reading on the mano. When you close the plate, none or very little can get in to satisfy the negative pressure, shown by a slightly stronger reading on the manometer.

coalcherry · Post by **coalcherry** » Wed. Feb. 20, 2019 8:59 pm

Hello all, sorry for jumpin in but got questions for dwyer mark 2. I just got it hooked up but guage is way in the negative e scale. I've got my stoker stove with a brake line connected on the low side. Is this correct?

coalkirk · Post by **coalkirk** » Wed. Feb. 20, 2019 9:21 pm

Did you zero the gauge?

WNY · Post by **WNY** » Wed. Feb. 20, 2019 9:30 pm

coalcherry wrote: ↑
Wed. Feb. 20, 2019 8:59 pm
Hello all, sorry for jumpin in but got questions for dwyer mark 2. I just got it hooked up but guage is way in the negative e scale. I've got my stoker stove with a brake line connected on the low side. Is this correct?

You have to zero it first with it unhooked. and make sure you hook it up on the correct side so it reads to the right (even tho its' positive, you just have remember it's vacuum (or negative pressure), if goes way negative, switch hi and low lines. it should go the other way.

Dwyer Mark II Manometer Questions

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