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Central vac for my house is needing replacement
QUESTION: Does anybody have experience using a DC as a central vac?
I have central vac for my house and the vacuum unit is old and
needing replacement. I also need a DC for my shop. I was thinking
about using a DC for both applications, but I don't know if
the 2 applications have the same requirements. I know that a vac
or a DC have 2 properties: inches of vacuum at no flow, and cfm
at no vacuum.
Has anybody tried this, or what do you DC experts think?
ANSWER: I don't think that it will do what you want it to. A DC just doesn't have
the static pressure to work well as a central vac just like a central vac
doesn't move enough air to work well as a dust collector.
Someone asked this at a Penn State bulletin board a while ago. The reply
was that you will end up burning the DC out because it can't handle a
restricted load like that. They said if you can only afford one, to get a
Fein vacuum; it isn't good as a DC, but at least it will work.
I agree that a DC won't make a good vacuum, but I'm pretty sure that burning
it out on restricted load is a myth. A DC is a centrifugal device, not a
positive displacement device. As you restrict the airflow, the motor load
goes down. To the limit, cutting off the airflow completely puts that motor
at a virtual idle state. This can be confirmed by looking the motor
horsepower requirements in the blower curves.
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