The new central vac was installed today and I spent all day on an incorrect piping system that I had to change based on this diagram.
Vac Line
The very first pipe I put in was a three way Y directed vertically at the vac input. That meant half of the piping at that point would be subject to dirt falling into it due to gravity. The supply pipe takeoffs must be horizontal. So I had a heck of a time re-figuring the piping to fit.
Three way Y fitting
I took out the Y fitting and replaced it with a wide 90 degree so I had to attach all three of the lines to that. The main truck line is a vertical going up to the garage attic and the ventilation chase, the airlock entry pipe joins the mail line through a bend in the pipe and then the garage inlet is a 90 degree to the back wall.
New Piping
This new piping arrangement makes the dirt entry either from a horizontal pipe or from above. That was the rule–no vertical dirt entry tees.
I think the machine looks pretty impressive installed in the garage. The top pipe attached to the muffler is the exhaust.
Central Vac Installed
Then I slept on it and decided that the 45 degree angle would also allow dirt to fall backwards into the pipe so I changed it again to all horizontal pipes where the dirt enters.
New piping with 90 degree angles
But I had to use a short 90 degree elbow instead of a sweep to fit the pipe in the existing space. So it still breaks a rule. I sent the photos to the company to ask which one would be the best. I’m hoping I hear back from them after the weekend.