[Art]

One thing everyone needs to be aware of is the Norgren water trap shown MAY NOT protect your coach from moisture coming from the aux compressor.

Of the conversions I have a little knowledge of none use that water trap to prevent aux compressor moisture laden compressed air from entering the Prevost accessory tank or system. Before the Marathon folks remind me their system is isolated I am aware of that but if the coach has slides then the Marathon accessory system has to merge with the Prevost system to keep the slide seals inflated.

Make sure you are aware of if your coach does have a means of trapping moisture from the aux compressor, and if it does service it as often as needed, and if it does not seriously consider adding a trap or dryer that is capable of preventing moisture from traveling downstream.

[Roy]

Art, like Jon is always saying, it varies from bus to bus. My Liberty has the Norgren filter separator that you pictured. It’s in my steer compartment with a regulator that’s set at about 30psi. It’s a secondary filter separator for the bathroom air pocket door only.

On my coach, the primary aux filter separator that’s downstream of the aux tank, it’s a Bendix type E, and it’s located just inside the steer compartment door bottom right. Here’s a link to the rebuild I did on it: /threaddetails.asp?Category=&ThreadID=6359

Then, just down stream of the aux compressor is another aux system primary filter separator. It’s an SMC brand. I added a second one. Here’s a link about that: /threaddetails.asp?Category=&ThreadID=6167

[Jerry]

Prior to the widespread use of slides, and the need to have the aux compressor providing air for the seals few conversions had problems with moisture coming from the aux compressor. Not because the air was necessarily dry, but because few of the coaches needed to have the accessory system pressurized all the time. But slides with pneumatic seals have forced owners to keep the accessory system pressurized at all times and because of that need dealing with moisture became something that had to be done.

A coach with a tight accessory system whose aux compressor rarely operated had less moisture issues, but a coach with the leaks that eventually cause the compressor to run more and more frequently have moisture present in significant amounts. In high humidity areas a coach whose compressor cycles often will create enough moisture in a water traps such as those pictured above to fill the bowl within a week. After that the moisture is carried into the coach accessory system and accessories few of which can tolerate moisture.

[Archived]

Yes that’s right about aux compressor it comes in after the Norgren filter to a T at the manifold in the steer compartment, But my aux compressor never gets turned on sense I got rid of the air toilet, the engine air bags stay up now after I put a new one way check valve at the regulator, but regardless of that the aux compressor has a filter water trap on it that I’m replacing with a new one just because of the age so if I do use it it will protect the suspension air system

[PAUL]

I hope you mean it has a trap downstream from the aux compressor because immediately downstream from a compressor the air is so hot water is still a vapor and will not be trapped. To best trap the water content of compressed air the dryer or trap needs to be far enough away for the air to cool so moisture can condense. It is not uncommon to see distances of 15 feet or more separating a compressor from its water trap.

[Dick]

The new filter for aux compressor will be in steer compartment which is 15 or more feet from compressor, also the little one they installed is close to compressor