Good news. I found the problem with kitchen! I did not find it earlier because I was taking my manometer readings at the wrong locations, ( i.e. not at pitot reading locations, which I didn't even see one of them).
Where do I start? I dunno, so .... my return fan inlet ESP was 1.74" and the...
The only documentation is the blue prints, with regards to cfm, sp, etc. The unit does have the model number, but no air flow specs.
I have a new thought about this problem of mine. While I wait for the pitot tube to arrive, I think I may have stumbled onto a cause. A clogged coil. I get a...
Yorkman, you are right again. I took several other units sp's today and could not determine anything useful. I'm gonna break down and buy me a pitot tube.
Nameplate data? There are labels on the units, but no specs supplied nor printed on the units themselves. (1992 origin). Fan curve data? How do I go about getting this information? Do I pay for a vendor rep visit?
Supply side verses return side. Those 2 points are but a few of the points in...
I did take readings on both sides of both blowers and have all the numbers written down at work. But the .027 reading I cited is from the outlet of the supply blower.
Have I committed an error in measurements?
If so, let me think. I recall: +0.27" blower outlet.
And when I connect the...
Yorkman, I've been thinking along those same lines. There is no inlet door that I've seen, but tommorrow I will track the duct to find one. Most our ducts do have doors, so you have gave me something to look for tomorrow. Out of desparation, I might cut an opening myself and then close it with Z...
Well, I took another close look today. It still a mystery to me. The figures I posted were after I installed new filters and tightened both belts. When I opened the cabinet door on the blower side, the reading increased from 0.27 to 0.44" on the supply duct, just after the blower. I was...
The belts have been ignored for so long on these units, that they are streched, running very loose for perhaps years and maybe they became glazed and unable to grip the pulley anymore, even after I tightned them. hmmm, just grasping for straws, but I wish I had a tachometer to read the blower...
Im still working on what seems to be low air flow to a kitchen in a public school. The blueprints for show two figures: Air Handler ESP= 0.87" RAF (return air fan) = ESP= 1.14. I've taken several readings and none of them match those numbers, nor even close.
Where, or what points did the...
Thanks for all the help. I now feel empowered to go back and tackle that job on Monday. I'm leaning toward the pitot tube as well, partly because I'm a pureist and like shiny tools.
I'm gonna wait to buy it for now, cause I don't think I have the access to the needed duct run of 16 ft to use...
imok2, your last post hit the nail on the head, thanks! It is all too clear to me now! Those pictures were worth a thousand words. Also thanks to the others that are helping me polish my knowledge!
Now does anyone have any advice for me with regards as to what to buy. I currently own the...
I looked up the part you mentioned. I see it but I don't understand how that will fit through a single test hole in a duct. Compared to a static pressure probe, I don't understand how that pitot works with its 2 prongs.
You mention a velocity reading with a pitot tube, however, the pitot static pressure probe only yeild static pressure, not velocity. This is a large part of the problem I'm having.
p.s. I could decipher the sq root meaning.
I have a air handler serving a school kitchen. The air flow seems poor and cooling is weak. How can I derive the actual cfm being delivered?
I took a External Static Pressure reading midway down the ductwork,, it .21" for a 20x20 inch square duct. The supply fan is rated 1650 cfm. There is a...
