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Aux. Air Pump

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Gerald Farris:
HWH uses two basic 12 volt compressors. They are both Thomas compressors. One has a larger air flow capability than the other. The smaller compressor develops .43 cfm at 60 psi and .27 cfm at 100 psi. The pressure relief for the smaller compressor is normally set at about 110 to 115 psi. The larger compressor develops .95 cfm at 100 psi and .70 cfm at 140 psi. The relief for the larger compressor may be set as high as 140 psi.

My 2000 Marquis was equipped with the smaller compressor that failed when the coach was about 5 years old. I replaced it with a Viair 380C compressor that pumps air 3 times faster (.81 at 100PSI) and has a 100% duty cycle at 100PSI. To run the higher output compressor you will need to add a high amperage relay in the circuit.

If you have the larger compressor and want higher output, you will need to add a second compressor as you can also do with the smaller one if you want to keep it and add a second compressor.

Gerald

William Mathews:
Do those air bag leveling compressors add air thru the regular system dryer or have some sort of dryer of their own?

Tim Bentley:
Thank you Gerald

I found several sources for the air pumps on the internet using the description you provided.

Joel Ashley:
I understand that Viair is a very good brand of compressor, albeit not cheap.  You get what you pay for.  Their website, http://viaircorp.com/OffRoad/compressors.html, may offer you some options.

Gerald Farris:
The auxiliary (air leveling system) compressor does not pump air through the engine air dryer, but it has a small water separator (in most applications) that dumps any water that it collects when the compressor cycles off.

Gerald

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