Help with a Quincy

[bestonearound]

Hey folks,

I got a Quincy air compressor for $500 bucks. It's a FF325 with a 325-18 compressor and a 5hp Baldor L1410T motor 240v single phase.

I do not know how to wire it back up, and I don't know how to properly replace the pressure switch? I'm assuming is the black box with three wires.

The faded reds go from the pressure switch? to the motor wiring and wire nuts. The green goes from the pressure switch to a ground just inside the motor's wiring box. I am thinking that the black wire and blue wire connected together to one of the faded reds that run to the pressure switch and the yellow wire and the (newer) red wire connected together with the other faded red running to the pressure switch. Is this correct? Thank you.

 

[bestonearound]

Also wondering where I could get a cover for the pressure switch once it's wired back up correctly

 

[rockwithjason]

somebody hill billied that together but you can make it work. the pressure switch has to poles, like having two switched operated by the same handle. run the incoming power wires to the pressure switch and land on on each pole. then from the load side of the pressure switch to the motor. you want the pressure switch to cut off the motor power when the tank is full. make sure you install a disconnect switch at the unit so you can cut the power off to work on it. really a motor that big should have a magnetic starter on it but i think you can make do. i doubt you will be able to buy a cover for the switch by itself. you may be able to score a used switch on ebay or something and get a cover that way.

 

[oilslick]

You got a hell of a deal, I would put a mag starter on it though. This would give peace of mind that those press switch contacts won't weld together and burn up your **** when you are not around! They sell for around 100 bucks but I gave in and upgraded my Quincy 325. If you are not familiar with that sort of compressor you are in for a long lasting relationship, they have a unique unloaded startup that impresses most gear heads. Good luck!

 

[Trey T]

I would check that pulley on the motor, it looks quite small which it may overrun the pump.

 

[gtermini]

I would check that pulley on the motor, it looks quite small which it may overrun the pump.

A small sheave on the motor will run the pump slower, which equals longer fill time and maybe pump life. Most 5HP single phase compressors are really ones designed for 7.5HP 3 phase motors and they slow the pumps down to run them at a lower power requirement. That is the case I bet this one falls into. Sometimes the motor sheave can be upsized to reduce tank fill time, but this may require more power than the 5HP motor has.

Formula for shaft speed: driver sheave diameter divided by driven sheave diameter then that number times driver RPM

Greyson

 

[Trey T]

^That's right.