So I just finished my SANDEN on board air project and it works great other than one minor flaw. When the compressor is turned off, there is a small air leak coming from the output valve area of the Senden compressor where the air line is connected. Now from what Ive read, there is no need for a check valve and thats why I origanally didnt install one. Im guessing this is my problem? Ive double checked all my fittings and know theyre not the cause.
Does anyone have and ideas or FIRST HAND EXPERIENCE with this?

Thanks

 

You should install an Unloader to allow the high side pressure to be relieved when the compressor shuts off. This will require an inline checkvalve be installed as well.

 

Never heard of an "unloader" Is that the exact name for it?

 

And Frank, when I took off the output connection to the compressor, there was some yellow/orange stuff coming out. Do I need to let the compressor run without the output hooked up so it will cycle out all the A/C freon crap and wont ruin anything?

 

Yes, that's what it's called. You can get them from WWW.GRAINGER.COM

 

Thats probably oil. You need it.

The down side to using a Sanden compressor instead of a York is the need to add oil more frequently.

 

Yeah I just found them in my Grainger book. What exacly do they do? I read the discription for a " Load Genie Unloader" and am way confused. And theres also a "Unloader Pilot" and a " Load Genie Continuous Run Unloader Control" I dont make any sense of them lol
Does it matter that I have a pressure switch rated at 110 to 150psi?

 

This is one you want:
http://www.grainger.com/Grainger/wwg...17&submit.y=10

Basically an Unloader allows all of the pressure in the high pressure side (discharge) of the compressor to be vented (Unloaded) to atmosphere when the compressor shuts down. This increases the life of the compressor since it won't have to start against a high head pressure. A check valve is needed to prevent the compressed air in the lines and tank from bleeding out through the Unloader.

Make sense?

Your compressor clutch circuit should go through a pressure switch as well. This will allow the compressor to cycle on and off based on the pressure in your tank.