Thread: Air compressor pressure switch

Does anyone know the cut-in and cut-out pressures that the air compressor pressure switch uses. Rather than replacing my compressor with a higher volume compressor i am thinking of running a second line to the tank and a second pressure switch. I have bought a ViAIR 2cfm compressor and could easily (with some bracket mod) mount it to replace the standard compressor like Paul and others have done with the larger Thomas compressor (1.3cfm). The standard compressor is fine but at only 1cfm tends to be a bit slow when going from low to high settings. I also want to run a tyre inflation unit off the second compressor. I could just tap the line into the valve block but i don't think i will get the volume i want and i am pretty sure the two compressors pumping into the same line will play havic with the main pressure sensor.
Any thoughts?
Cheers,
Remy

Originally Posted by Blknight.aus

tagging the 2 compressors in at once wont cause any heartache to the switch but will need some interesting wiring and piping to get to work correctly.

The wirings fairly easy just tap the first compressors main power feed to drive a relay and then deliver power from the relay to the second compressor, have a switched AUX feed deliver power to the other side of the relay so that when the second compressor needs to run to do tyres you can turn it on manually.

the harder part will be setting up the dump line for the compressor so that you're not relying on the valves in the compressor to hold back tank pressure when the compressor is not running. you can stall some of the 12v compressors if they try to restart with high pressure against them then they just sit there till they burn out or (and you can pick some of these up at garage sales sometimes) the owner decides that they are stuffed and disposes of them to buy a new bigger compressor.

if you want faster inflation times ditch the second tank idea and plumb the compressors onto the same airline that feeds the existing block but put a pair of one way check valves straight after each compressor to stop them backfeeding each other. T that line and run it up to a nitto fitting somewhere convenient then fit a dump valve to the tank.

when its time to inflate tyres dump the tank pressure and then start the engine inflate your tyres and you're away the tank will act as a small "surge tank" so that you dont have to shut the compressor down between tyres.

I replaced my factory compressor with a DC 5000
See: DC5000 Compressor Review

There's no replacement for displacement

I had to wire it with a winch solenoid, 80 amps fuse and 40 amp manual reset circuit breaker.

It worked during 2 years with sometimes having to push button of the circuit breaker. It was caused by restarting at high pressure.

I was thinking about changing the factory pressure switch for a lower...didn't find time.

My wiring last 2 years like that and now i believe the circuit breaker or the solenoid is dead.

During those 2 years, the Airbagit company released a new product call high pressure head compressor release. (Compressor head-pressure release valve allows restarts over 145psi, by bleeding off high head pressure that inhibits restarts. )

I'm thinking about buying it and rewire everything since i cannot longer live with the factory compressor now.

Imagine that factory compressor brand new takes 9 minutes to fill the tank when the DC5000 does it in 2 minutes.