[John]

PCC,

It’s best to have a filter to remove moisture from the aux compressor as they do make some water. Here’s a pic of mine if you can see it. MIne has a manual drain tube on the bottom.

[Tom]

Because I show my vehicle, there are sometimes days when I am on the auxilliary compressor. Any suggestions about which units to consider? Manufacturer? Size?

Compressor has a 5 gallon double tank, which is connected to the feed to my vehicle wet tank.

[Keith]

PCC,

Truk has it right.

If you can add your coach info in a signature line, or tell about your converter, or let us know the configuration of the aux air from the pump it would help gve us a better idea of possible solutions. If you have room one item that will help a lot if you do use the aux compressor a lot is to add another air tank immediately downstream from any dryer or moisture trap you might have installed.

The tank need not be large, even a gallon in size will work, but it is important it have a drain fitting and petcock on the bottom. This would function just like the first tank installed on the chassis which is often referred to as the “wet” tank. That tank will capture a good amount of the moisture that gets past the dryer or trap. I had such a tank on my first coach and drained it routinely. It did occasionally have some moisture in in it. Getting moisture out of the aux system may not seem critical, but if it should find its way into the Norgren valves that are for the suspension it can really screw up your leveling and start to get expensive.

[Archived]

My compressor is a basic commercial compressor, with its own tanks (5 gal total). That is plumbed to the air inlet which allows a wrecker/tow truck to pump up the tanks to tow the vehicle, which feeds to the wet tank, then goes on to the other tanks in the system.

If the compressor tanks are sufficient to collect the majority of the water from that compressor, before it gets to the system, then I am OK?? Did I read the reply correctly?

[Ron]

By the way, I am doing the conversion myself, and this is number 9. But this one has taken everything I have ever learned, in every trade I have apprentised, and still I am finding things I am not sure about, so I ask – a very unmanly thing to do?

[Rob & Wendy]

PCC,

If you have retained the 5 gallon tank with the aux compressor, and are feeding air into the wet tank I suspect you are doing al you can do. I would drain all tanks often, but other than that I think you are going to keep air from the aux system because it is being delivered to the 5 gallon tank, wet tank, primary tank, secondary tank and then the aux tank before it is distributed through the aux system.

Cannot imagine the air being hot and moisture laden by the time it exits the aux tank.

Forgive our previous responses because our brains are geared to our aux air entering the system from the aux compressor into the front port supplied by Prevost for the converter (not exactly accurate but for this discussion close enough). We don’t think of homebuilt in which converters tie into the air system at other points. It is critical however for you to insure you are using some type of air system check valve or protection valve so if any failure of the aux compressor line to the wet tank is damaged you retain the integrity of the brake systems.

[Ace]

Yes, I have done all the double redundant safety stuff to ensure that the pneumatic system remains intact on the coach – first priority.

Thank you