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12 volt air compressor will not shut off

October 31, 2019, 03:44:00 pm

On my 2005 U270, the 12 volt air compressor will not shut off. The problem appears to be the valve on bottom of the Parker glass condensation bowl. The valve is open and allowing compressed air to escape out the end which in turn is keeping compressor running.
Is there a way to get this valve to close or some kind of work around? For the time being I have pulled the 5 amp in line blade fuse on the compressor which has shut it off. The valve is an Automatic  valve 12-D-DA and below  that the number 1315. See attached 2 pictures
Thanks to all.

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Re: 12 volt air compressor will not shut off

Reply #1 – October 31, 2019, 04:10:08 pm

By the looks of the pic. you may have some trash hung in the drain solenoid.  Take the bowl and drain off and give it a good look at the seat for trash first.

Mike

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Re: 12 volt air compressor will not shut off

Reply #2 – October 31, 2019, 04:39:52 pm

That solenoid is notorious for developing leak-through as Mike mentions.  It's a NO (normally open) solenoid, unlike the other ones which are NC (normally closed).  It is supposed to close when the compressor is running, then open (with a "WHOOSH") to expel the condensate.

Good idea to carry a spare solenoid (and "revitalize" the one you take off so it can become the spare).  Steve had a write-up with a tutorial on this; not sure it's still on the forum or not.

Another weak point is that condensate bowl itself.  The temperature swings will cause it to develop cracks where the fitting is screwed in at the bottom of the bowl and that will also lead to leaking during compressor operation.  We replaced ours at the 8 year mark, so if yours is OEM it might be due.  We have seen at least one coach where that bowl catastrophically failed.

ETA - P/N for bowl with the HWH purge valve, is Parker P/N PS721P (HWH part number RAP90539). This is a 06L Poly Bowl with 1/8 Connector.

P/N for the solenoid is HWH RAP6354 assuming for the TA-4101 compressor

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Re: 12 volt air compressor will not shut off

Reply #3 – October 31, 2019, 07:22:25 pm

Thank you for that advice. I will remove that bowl in the morning. Does the bowl simply unscrew From the mount?

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Re: 12 volt air compressor will not shut off

Reply #4 – October 31, 2019, 07:30:41 pm

I think on yours you will have to unscrew the black knurled keeper ring.  With it un screwed the bowl and ring should come off together. You may have to use a strap wrench to get it to come loose.

Mike

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