Skip to main content ↑ ↓
Topic: Air Tank Switch (Read 2071 times) previous topic - next topic

Re: Air Tank Switch

Reply #20 –
Quote from: propman –
I had never noticed but just on this trip, when i leave the HWH on it maintains the level by slowly letting air out. It never puts air in. So in 3-4 days air is gone and bags are flat. Then i have to run the engine to refill the tanks. Something must not be working right?
Yes, something is not working right.  If your air tanks are empty, and you press one of the manual "RAISE" buttons on the HWH panel, then the "AUX" compressor should run.  I think this statement is correct no matter what HWH Series (air) system is fitted to your coach.

Re: Air Tank Switch

Reply #21 –
The air tank switch in probably not your first problem, with slides the compressor needs to maintain pressure to the seals and to deflate and inflate them after operation. You should hear the comp running sometimes especially after moving a slide, [if main engine compressor has not filled tanks]  On mine I have a switch next to compressor and a gauge. .

Re: Air Tank Switch

Reply #22 –
Quote from: Michelle –
You can test the Air Tank switch to see if it's working properly by watching the Driver Info Center A and B tanks with the ignition on (at Accessory or something like that - where you can see dash activity but haven't started the coach).

If you flip the switch, the aux compressor should come on and you should see the A and B tanks increase in pressure (up to the limit of the aux compressor.

If the tanks are low and nothing happens when you turn the switch on, it's possible the switch or the solenoid are bad/disabled.

If you see the A and B tanks increase in pressure when the aux compressor is running BUT you don't have the Air Tank switch on, the solenoid is leaking through and should be replaced.

You should NOT leave the Air Tank switch on.  It's purpose is solely to allow you to air up the coach most of the way to depart in the morning without running the coach engine until absolutely necessary - basically to be a good neighbor at a campground.  The desiccant charge on the aux compressor is MUCH TOO LITTLE to use the Air Tank switch regularly or to leave it on.
not to ask a dumb question but where is the air tank switch located??? on a 2000 u320?

Re: Air Tank Switch

Reply #23 –
I don't have any slides.
Electric "HWH" compressor is working, such as when i "press one of the manual "RAISE" buttons" slow but it does work

When i do this "You can test the Air Tank switch to see if it's working properly by watching the Driver Info Center A and B tanks with the ignition on (at Accessory or something like that - where you can see dash activity but haven't started the coach)." I get nothing. The Air Tank Switch is not activating anything.

Yesterday (Tuesday morning ) after HWH was left in auto mode the bags were empty, I noticed for 3 days or so HWH kept it level by letting air out never adding air in. Tuesday I started the engine and let the engine compressor fill up the bags and the tanks, then i had the HWH do the leveling but this time for over night i did not leave HWH on auto level mode. This morning we were still level and bags were not flat, all with air.

Re: Air Tank Switch

Reply #24 –
Quote from: propman –
Yesterday (Tuesday morning ) after HWH was left in auto mode the bags were empty, I noticed for 3 days or so HWH kept it level by letting air out never adding air in. Tuesday I started the engine and let the engine compressor fill up the bags and the tanks, then i had the HWH do the leveling but this time for over night i did not leave HWH on auto level mode. This morning we were still level and bags were not flat, all with air.
Well, you do have a puzzling situation here, because these two "tests" are contradictory.  But then, air system problems are never simple.

In the first test, you say the HWH system kept the coach level by releasing air.  This is what should happen, but only if one or more of the air bags are leaking down (losing pressure).  Every 30 minutes, when the HWH panel wakes up, if the coach is not level, then (initially) air will be released to regain level.  This indicates the level sensor is working, and the system is responding correctly (up to the point where the compressor should run).

BUT, in the 2nd test, when you start out level, and leave the HWH auto level turned off, the coach stays level.  This would indicate that none of the air bags are leaking down (losing pressure).  WT..IGO?

SO, the question is: why do the air bags leak down in the first test, but not in the 2nd test?  At the moment, I can't think of any logical reason.

However, in the first test, your aux pump should (eventually) come on and it doesn't.  You say the pump will run (slowly) when you press a "raise" button.  This tells me that the power supply to the pump is OK, and that the pump is correctly sensing low system air pressure.  But it does not run in auto level mode.  Why?  To answer that question, you need the trouble shooting guide for your system.  Do you have the user manual?  Do you know what HWH series is fitted to your coach?  If not, look here:

http://www.hwhcorp.com/ml17785_01_nom_pr_lesy.pdf  (Scroll down - it's a long document)
 

Re: Air Tank Switch

Reply #26 –
Chuck & Jeannie Reply#24  We are in Cortez, CO this evening :-) slowly on our way back home (Yellowstone is amazing). I really need to retest the HWH when i get back home and report back with my results . For now I am getting a way with, level and stop, don't leave it in auto level over night, it works for now for this trip.
Thank you,
Al