Phoenix 69HAU2 Heavy Duty 100/125 PSI 1-Port Air Compressor Switch with Unloader Valve (Furnas type)

5NOV16What I didn't like (followed by what I liked):1 of 3 -This thing comes with nothing in the way of instructions, other than the printed label inside the cover. I bought two of these, sending back the first pressure switch because there seemed to be a problem with the unloader valve, which there wasn't, but the unloader is a bit of an odd-ball part. Unlike what you'd expect, the unloader valve has a spring that biases it OPEN. Pressure in the line closes this spring loaded unloader (pressure working AGAINST the spring) until the point when the switch opens contact and a lever opens the valve. Obviously, that's an operational scenario that will work, but why should the spring bias the unloader valve off its seat?2 of 3 -Additionally, the ferrule on the unloader valve is NOT for 1/4" tubing. I think it is for 6mm (slightly smaller) line. 1/4" tubing won't fit through it, so I had to find a different ferrule, one made for 1/4" line. Also, the supplied nut clamping the ferrule is not designed for a common symmetric ferrule. It has a square (not tapered) rear edge. Luckily, my old unloader line nut made for common ferrules fit this unloader.3 of 3 -The line attachment came with a rather unusual gasket. It looked like it was made to seal/seat at the base of the, presumably, pipe threaded hole. Being pipe threads this made no sense. There shouldn't be a gasket and pipe threads in the same place! Apparently, the threads work, good enough, when mated with a pipe threaded fitting because there were no problems with fit or leaks. The gasket is for ????????Also, I never got a reply form the factory website, although it promises an answer within 24 hours.What I liked:Setting the pressure for the Motor Off point and Motor On point was fairly easy. I was very happy that these two set points (I used 98 PSI & 125 PSI) were very consistently maintained after days of operation.Overall this is a good and reasonably priced replacement part, albeit cumbersome to install. This seems to be especially true when you've got a 3HP 240VAC switch requirement. All the other common, and inexpensive, switches are only rated for 2HP, which wouldn't work for me.

worked and fit perfect on 1970s sears 150 psi 240 v air compressor . Thought it would hit the plastic shroud but cleared it by 1/4 inch . the only extra parts needed where a 1/4 to 3/8 black pipe reducer and male connectors . Pressure cut off was set at 175 cut off, so turn cut off screw counter clock wise 2 turns then re adjust after running compressor .

Excellent unit.