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Tool Talk Discussion Forum

O/T Need a central vacuum technician

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Able

11-18-2005 11:49:10




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I've got a Sears best model 40534 built in vacuum that has got very poor suction. I have been under the house to see if any of the pipes were seperated,none that I could see. The motor runs good and excellent blow out at the discharge. There are three outlets in the house, closest outlet to vacuum there is fair suction,second and third outlet hardly no suction. I done a few things to see if pipe was stopped up. I even had a wet-dry vac in the house pushing while the built in was pulling. The line doesnt seem to be stopped up. Had a sears tech out here about a year ago and he said nothing wrong with the vac,must be in the line. He only looked at the vac,said nothing wrong with it, this is as far as his job description goes. This vac has been doing the work in a 2400 sq. ft. house for about 14 or 15 years. Could it be the thing is just worn out. Any information and suggestions appreciated.

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Ryan - WI

11-20-2005 17:41:38




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 Re: O/T Need a central vacuum technician in reply to Able, 11-18-2005 11:49:10  
I think I may have the solution. If all the ports have poor suction except one, my guess is that the good port has a bad seal on it. When the hose is in it seals around it and works well, but when the hose is in another port the flap isn't sealing causing a bad suction issue.

The one you think is good is actually the bad one. Kind of like fencing in a rabbit in the garden.



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Rod in Smiths Falls, ON,

11-19-2005 14:20:04




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 Re: O/T Need a central vacuum technician in reply to Able, 11-18-2005 11:49:10  
First, I am assuming that you have tried another hose. If you haven't, drop a small screwdriver through the hose and if it comes out the other end, go on to the next step. If it doesn't, shake it back out, reverse the hose and blow the obstruction out of it.

Second, remove the unit from the wall and check its suction on the hose without the house involved. This should work with a bit of fiddling: hook the hose to the intake and squeeze the two signal wires together to start the motor. Any better?

Third, assuming that second worked, look hard at that piece of hidden pipe.

Finally, is the filter properly connected? Is the little plastic cover over the sponge filter still inexistence? Properly installed? (Assuming that your model has a foam filter.)

Good luck. Central vacuums are reliable workhorses for years and years, with a little care.

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T_Bone

11-19-2005 03:25:27




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 Re: O/T Need a central vacuum technician in reply to Able, 11-18-2005 11:49:10  
Hi Able,

This is a subject that's so simply applied that a person could talk for days on the subject. I found a good link to a better understanding of how a vacuum cleaners work and if you know how it works then it's easy to troubleshoot when it does't work. Follow the click me link.

As to a engineering understanding of why the vacuum cleaner works, read this next section until you grasp the Bernoulli's principle. This is also explained in the first link on the first page about how a soda straw works.

Link

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huintingreen

11-18-2005 21:10:59




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 Re: O/T Need a central vacuum technician in reply to Able, 11-18-2005 11:49:10  
If you dont have suction right at the vacuum you have problems in the vacuum. Most of these vacumms have and outlet on the vacuum where you can hook the vacuum hose strait to it. Mine is a little chrome door. Again if there is no suction right at the vacuum that is were your peoblem is.



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NC Wayne

11-18-2005 20:38:20




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 Re: O/T Need a central vacuum technician in reply to Able, 11-18-2005 11:49:10  
Never worked on a whole house system before but it sounds to me like the same thing our shop vac does when it gets clogged with metal turnings. Judging by what I've seen working on my regular upright vac it sounds like the same thing is happening to yours but with hair, carpet fibers, etc. Basically the motor/vacuum unit showes no signs of anything wrong and blows plenty of air out because the air flows easily enough through the obstruction but still you've got no real suction at the other end. My suggestion would be to clean the canister out really good. Then turn the system on and go inside and feed some small pieces of colored confetti, or something easy to see and identify, into one of the suction ports. Then go back to the canister and see it made it through the system. Do that one port at a time with all of them, checking the canister after doing each one. If you see material in the canister from any of the ports you'll know that particular one is OK, but if none of the material gets to the canister from any of the suction ports you'll know the blockage is in the main line and not one of the branches. This might be a little time consuming but that's the only way I can think of to test the system without tearing into it.

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NEsota

11-18-2005 19:48:58




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 Re: O/T Need a central vacuum technician in reply to Able, 11-18-2005 11:49:10  
Maybe ya could disconnect the vac and connect a leaf blower in its place to discover if the pipe is leaking. This method may not be UL approved.



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Green B

11-18-2005 17:24:35




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 Re: O/T Need a central vacuum technician in reply to Able, 11-18-2005 11:49:10  
A couple of things to check, Drop canister off and check screen that keeps large chunks of going up to to fan. The second thing you might is take a string and let the vacume pull it into the canister and shut off vaccume off, leaving the other end of the string at the farthest outlet from the vaccume then tie a sock or something on the string and pull it through the tube to clean it you might have something in suction tube. HTH

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MAC,IL

11-18-2005 15:02:03




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 Re: O/T Need a central vacuum technician in reply to Able, 11-18-2005 11:49:10  
I wouldnt take anyones word about the Vac being OK, did he take it apart and look at the impeller or intake fan, seen those get real cruddy over time and lose a good percent of the vacuuming suction.



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Able

11-18-2005 16:29:18




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 Re: O/T Need a central vacuum technician in reply to MAC,IL, 11-18-2005 15:02:03  
nope,sears tech just overweight and didn't want to get dirty.just started it up and said nothing wrong. but no service charge,i would rather have paid him and got the thing fixed.



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RandyBee

11-18-2005 14:05:21




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 Re: O/T Need a central vacuum technician in reply to Able, 11-18-2005 11:49:10  
Have you pulled the line loose at the cleaner and checked for suction there? Could it be a kids ball or wad of paper that has stopped the line up or the input to the cleaner?



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Able

11-18-2005 14:37:41




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 Re: O/T Need a central vacuum technician in reply to RandyBee, 11-18-2005 14:05:21  
I have taken what can be taken apart and there is no blockage going in. I didn't mention in my first post that the vac is in the garage and the suction goes through brick underneath the laundry room that is almost impossible to access. This is the area I did not check,only about five or six ft. of line. Still could be blockage or leaking. Don't know. And too cut suction line outside of vac to check suction. A question in my first post was do these things wear out and just get weak even though it runs good?

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Ranee

11-18-2005 16:50:37




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 Re: O/T Need a central vacuum technician in reply to Able, 11-18-2005 14:37:41  
On your question do they wear out the answer is yes but that does not seem to be your problem. The vacuum cleaner has a fan impeller that the motor turns at a high RPM and you seem to indicate the motor is running correct and the air blowing out is normal.



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evilboweviel

11-18-2005 12:02:14




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 Re: O/T Need a central vacuum technician in reply to Able, 11-18-2005 11:49:10  
sure sounds like a leaky line. probably find a broken line somewhere. if the line was good would have the same suction at all points difference would be in rate of flow.
Ron



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Able

11-18-2005 12:26:15




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 Re: O/T Need a central vacuum technician in reply to evilboweviel, 11-18-2005 12:02:14  
There is also an outlet at the vac and very poor suction there. I checked all the lines and they did appear to be good. Maybe I need to go back and double check them.



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Ralph - Ohio

11-18-2005 19:42:58




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 Re: O/T Need a central vacuum technician in reply to Able, 11-18-2005 12:26:15  
You mentioned that there is an outlet right at the main unit and the suction is bad there. Can you block all other lines going to the rest of the house? If so and if the one right at the unit is still weak it seems the problem is in the main unit and not the lines as some have suggested. If it was mine I'd tear it apart.



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evilboweviel

11-18-2005 12:39:52




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 Re: O/T Need a central vacuum technician in reply to Able, 11-18-2005 12:26:15  
take a 10'tube fill it half full of water. take 6' fold it half with both ends pointing up looking like a U. then use the 4' section and attach it to the inlet of the vacumn. turn the vacumn on, the water will rise in one column and drop in the other the difference is inches of water column. Should be at least 20" then repeat through out the system, all should read close to the same if completly plugged off. if the furthest one away reads considerbly less then there is a leak some where. If the outlets to the system read considerbly less than at the vacumn with the lines unhooked then there is a leak.
If you have a vacumn gauge for a car or a magnahelic gauge it might go high enough to use in place of the tubing.
God luck Ron

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Able

11-18-2005 12:46:36




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 Re: O/T Need a central vacuum technician in reply to evilboweviel, 11-18-2005 12:39:52  
thanks.



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