HWH Air compressor control question

[caryt]

There is a small circuit board that's mounted on the air control solenoid valves and water
separator etc that's mounted under the coach. Has anyone found a replacement. Been waiting on HWH to return my calls...

Thanks

[gjames50]

Originally Posted by caryt

There is a small circuit board that's mounted on the air control solenoid valves and water
separator etc that's mounted under the coach. Has anyone found a replacement. Been waiting on HWH to return my calls...

Thanks

Might be able to help if I knew what HWH system you have. You can try looking up by your coach for manuals and spares directly on the HWH website. They do break out by coach manufacturer.

Pictures also might help others.

https://hwhcorp.com/

[caryt]

This is mine..similar top a 2000 series

[gjames50]

Looks like it's just part of the relay/solenoid. Have you seen what others have done with thier HWH Compressors?

See link: https://www.monacoers.org/topic/296-...t-last-summer/

[caryt]

Yes but I don't need to replace the compressor as that's all they have done, they kept the HWH controls. I need the small HWH circuit board.

[gjames50]

I can't see a board on the schematic in the manual. Not sure what that is.

[caryt]

Its their but not shown in detail. It controls the air solenoids one of which is a N/O water drain valve. Every time the compressor runs it closes then opens to drain the water from the separator. I would bet that every HWH air leveling has this same or similar setup.

[gjames50]

Got it. So does your water trap look like any on this page?

See link:Air Compressor Water Trap Assembly – HWH® Corporation

[caryt]

Water trap is std like all of them just like on page 20 of this:

ML28315 – HWH® Corporation

The water trap isn't the issue its the Board!

Shown here, only drawing I have found.

Still doesn't help as no part #'s and its been a week waiting for a call back.

[gjames50]

This is all I could find and I see no such part listed in the breakout.

See here: RAP0198 (AP0198) – HWH® Corporation

[caryt]

Thanks for your help.
Its a HWH part but as you found out no listing.

Unless someone has had this issue and can point me to a replacement part I'll have to wait till HWH calls.

[OldWEB]

I do not have any experience with this type of system, but love a good electrical mystery. I do think the part you point out in your diagram is the pressure switch to the right in your picture of the setup.
The circuit board you are seeking will be "up here" (in red) in your diagram.
The black item on the circuit board I would suspect is a transzorb for voltage spikes caused by the solenoid coil (and is located across the pressure switch contacts). The other beige item with one stripe I believe is just a "jumper".

As I said I have no knowledge of this system and your pics are not showing the complete set-up.



The transzorb

[gnvrvin]

Caryt it could have been made by a previous owner as it looks like a simple diode and a resistor
This type of setup would suppress a Transient spike from the solenoid

My thought
Greg

[OldWEB]

Here is shown the pressure switch.
(Thanks gjames50)