Original message
| botree
 |  "For Tinmantu"
, posted Fri 18 Jan 19:58:  
Hit the wrong key.
Tinmantu...I talked with a guy at the HVAC place where I got the blower and he told me the same thing. I blocked off one half of one side and all I got was a jump to 2.9A on startup and then on a 10A scale the digital meter just floated around .10A to a level not even readable. I didn't realize what you were telling me to do until after I talked with the man today. With the amperage so low I assume the motor won't last long. Do you possibly have another good idea I might try?
I thought about closing off more and more til' I got a decent reading. I can just use the foil duct tape til' i get it closed. What would that do? What about closing off some of the outlet. I have the blower sitting in a box with the output up against the side where I have an opening about 4"X10". I'm sure some of the air is getting by since I didn't tape the sides to the box but that will just keep circulating til' it makes it out. I made the intakes out of 14"X6" floor registers so that will give you some idea of what is going in and what can get out. Also used 8" round ducts, one tee and two 90° turns.
Enough for now...Bo
hot or cold
[this message was edited by botree on Fri 18 Jan 21:39] |
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| tinmantu
| "Re(1):For Tinmantu" , posted Sat 19 Jan 03:25:
All I can tell you is that I recently set up a carpenter with an exhaust fan, using an old blower and all I did was mount some slides on the wall to match the blower. Built a hood outdoors that accommodated the full opening of exhaust...Started blower, monitored amps while sliding a piece of sheet metal over non-motor side until I achieved the desired amps. Marked metal, cut to fit and pop-riveted it down...he is very happy. Could be wrong, but you seem to be making it a lot more complicated than it needs to be....maybe a pic of what you are trying to do would be helpful.
[this message was edited by tinmantu on Sat 19 Jan 03:31] |
| | botree
| "Re(2):For Tinmantu" , posted Sat 19 Jan 16:49
I have about 210 square inches of opening for feeding the blower. The box the blower is in has an opening about 40 square inches in size. When I start the blower I see a jump in the amps to about 5 amps. Then it settles down to zero or .10A. This is with a digital ammeter set on 10A. After starting the motor the meter reads 0.01 or 0.00 fluctuating back and forth. I have tried blocking off one intake. No change(NC). Blocked off both intakes. NC. Cut the opening for the outlet to about double its size to 80 square inches.NC. Closed down the opening to about half its size to 20 Square inches.NC. Added some tape to the side opening opposite the motor to close it off about 75% of size.NC. Also tried some of these things using an analog vole-ohm-amp meter. Set on 10A it barely moved when I turned the motor on and then settled down to no apparent reading. Moved the lead to 500ma and blew the fuse in the meter which I figured it would do.
The only thing that happened today I can appreciate is that it snowed about an inch. Snow stopped about 1:00pm and is about all gone now.
I am all out of ideas and I guess I'll leave you guys alone. I am really curious about what is going on and wish I had your knowledge about it. Monday I may go to the HVAC outfit we use and buy some time with their designer.
I will find out what this is all about sooner or later. There's got to be a logical reason this is happening. At least it is keeping me off the streets.
Thanks
hot or cold
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| | tinmantu
| "Re(3):For Tinmantu" , posted Sat 19 Jan 18:04
the only thing to try before setting up a different motor is to try a new matching capacitor....not saying it will fix it, but you should be seeing amperage differences.
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| | botree
| "Re(4):For Tinmantu" , posted Sun 20 Jan 12:24
One last question. I am seeing around 8.5mph to 9.5 mph of air going into the register. I used a wind speed indicator and put it in the opening against the screen I put in to keep things from accidentally being sucked in. This at least tells me air is being moved. What is wrong with just leaving things alone and letting the system run as is? I did notice that when I covered the 3/4's of the opening on the side opposite the motor the air flow dropped from 9.5mph to 8.5mph. I don't know how to convert miles per hour (mph) to cfm but I don't think I need to. It is taking the air from around the torch out of the shop and that is all I need to know. Like you said I was getting things too complicated. If letting the motor run as is showing almost no current flow is ok then I'm ok.
Thanks for the help and info...Bo
hot or cold
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