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Jun Aire
I was talking to a prevost owner at the campground who told me he leaves his jun aire compressor on all the time. I thought this was an auxiliary air unit? I know I have a small compressor for the HWH level system up front to keep the coach level and was wondering if the reason he kept it on was because he has a marathon with pneumatic interior doors. Question is do you leave the jun air on or off when camping. In my manual it states it is for tires, air mattress inflation ect but says nothing about that compressor running anything on the coach. BTW….what type of oil goes in the jun air?
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6 Replies
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Jim,
The Jun-Aire is your aux compressor and if you don’t need air inside the coach for toilet, pocket doors, bed lift etc, it can be left off. If your HWH needs air to keep your coach level, then you would need to leave it on. If you have no level issues, then air is not needed by the HWH as well.
If you leave it off, a good idea is to turn it back on before your ready to start the bus so when you turn the key on, there is air for the suspension, generator air bags, engine accessory bellows, floor slide, etc. Remember to drain the Norgren filter in the steer bay, the aux air compressors make water.
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I see it is SJ-27 synthetic
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The only times a coach should have the aux air compressor on is if the house has pneumatic devices and you are living in the coach, such as bed lift, pocket doors, toilet, etc. If you are not living in the coach the only time it should be on is if you have slides and the seals need to be inflated.
As Tom pointed out the aux compressors will pass a lot of water downstream and the water traps are your only line of defense to keep that water out of the aux systems. The amount of water that can be collected over a relatively short period of time is amazing so if the compressor needs to be on all the time make provisions for routinely draining the trapped water.
Nobody can accurately say how often the trap needs to be drained because some areas of the country are dry enough so the water accumulated might be a very small amount, while other areas of the country could be expected to collect quite a bit. And all of this depends on how tight the aux air system is and how often the pump runs.
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In my 2002 Royale coach which had a Jun Air supplied aux air for leveling in the event thre were leaks in the system for leveling and supplies air for your Zip Dee awning step cover ect. What is critical is the service and replacement of the the water and air seperators as this system used oil and must be seperated. The folks at Royale a Pheonix have these parts in stock and were a great help in getting this right for me. A contaminated air system is a nightmare.
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Everyone should be aware that the auxiliary air compressor often will not level a coach unless the cut out pressure is set to 120 PSI, which is really excessively high air pressure for other tasks. I am not suggesting a pressure that high will harm anything, but an aux compressor has to work very hard to reach that point compared to a cut in pressure of 60 PSI and a cut out pressure of 80 for example.
Those pressures are more than adequate for just about every task other than leveling and the compressor will run less and work less if that is the pressure range selected.
On one of my previous coaches the automatic leveling function (if selected) would be on all the time the key was off. What I found was that after the coach was leveled, if I left the selector in that position the leveling system was working all the time adding and exhausting air from the air bags as we walked around inside the coach or as the wind was blowing, gently rocking the coach. The aux compressor was being overworked compensating for how the coach shifted around. As a result we got in the habit of leveling the coach, and immediately prior to turning off the key we put the selector switch back to the driving position and then quickly turned off the key. That locked the air in the air bags and the coach remained level.
If you have a leaky suspension and need to run your compressor to compensate that’s a whole different issue and the answer is to fix the leaks.
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Those are good points Jon , I don’t even turn on my aux compressor any more don’t need it the only thing I might use it for is the step slide , and air door lock, if the air tanks are empty!!!!!!!!
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