Remote compressed air

[Spokane]

My compressor story:
I have a detached stick-built shed about 60 feet from my house that holds my air compressor (5hp, 30gal) and misc. tools, etc. I buried a PVC line (I know, I know) to my garage and used a hose in the wall to get down to the basement. Basement was unfinished and I wanted air for my texture gun. There are also two retractable hose reels on the system and about four outlets.

It has a slow leak somewhere...
The shed is on the corner of my lot and the neighbor’s house corners up to the shed. Their master is on that end of their house and I am sure they don't care for my compressor kicking on at 2AM to recharge. The shed seems to resonate at a frequency that amplifies the compressor noise at night.
My solution was to put a 120v power ball valve on the compressor and use a remote Christmas-light switch to operate it from the garage when I need air.
But, the ball-valve has a slow leak down of about 15lbs a day (chinesium from flea-bay).

Next, I had a 40amp A/C contactor laying around so I built a remote switch to operate the ball valve and power up the compressor at the same time. It's all wired for 20 amps and should be fine .

This setup works well except after sitting all week the compressor has a long run to recharge from flat.

The remote switch also has an on-board on/off button so I 3-d printed a rod to go through the cover and operate the switch in the shed when I need air out there.
Not perfect, but it beats walking out when I am in the middle of a project and need air.

 

[rlitman]

I'd fix that ball valve. Which chinesium one from ebay did you get? I use a stainless one on my compressor, and it doesn't leak at all. Is yours leaking from the stem, or the body?

 

[walta]

I like your plan it looks great.

I made a somewhat similar box for my compressor. I added a timer so the compressor turns off after 20 minutes if turned on with the remote in the garage. I have low voltage switches near each air hose outlet in the shop to run the compressor without a limit. The box also has an hour counter to track usage.

Walta

 

[Spokane]

Its the Bacoeng 3/4". It returns to the NC position on spring pressure and I wondered if the air pressure stopped it from fully seating. I closed the manual valve and then operated it. Didn't seem to make a difference. I soapy-water tested what you can see and no leaks there.

 

[rlitman]

Its the Bacoeng 3/4". It returns to the NC position on spring pressure and I wondered if the air pressure stopped it from fully seating. I closed the manual valve and then operated it. Didn't seem to make a difference. I soapy-water tested what you can see and no leaks there.

That *****. I'm not using a spring return valve. I'd suggest a 3-wire style that is powered both ways, with automatic limit stops so there's no power draw when it hits the end.

I'm using this:
https://www.amazon.com/gp/product/B06XWYNFG7/?tag=atomicindus08-20
FYI, they make a 1/2" version that's cheaper, but you already have the 3/4" bushings.

I connect the yellow wire to the common of my power supply, connect the 24VAC from the supply to the common on my relay, one wire from the valve to the NO position on my relay, and the other wire to the NC on the same relay.

 

[wyliesdiesels]

whats the Hp rating on that contactor?