Automatic bleeder valve??

Jaxie985 · September 2018

my Alde won’t heat on propane as I get an airlock error. My book says it has an auto bleeder valve? Or else it hasbleeder screws. Problem is, where are they? My main complaint with this unit is no “ map” !!
i might be able to bleed the glycol if I knew where the glycol tank and the screws or valves are. 2018 320 Boondock Lite. It’s not in the bath compartment behind the toilet unless it’s a grey canister which is also a mystery. Anyone?

Sharon_is_SAM · September 2018

Image: https://us.v-cdn.net/5021717/uploads/editor/65/k8jmzkqn7q4s.png

The glycol reservoir is located behind a removable panel on the driver side.
https://tab-rv.vanillacommunity.com/discussion/6085/how-to-get-to-glycol-expansion-tank

The Alde glycol line is supposed to self bleed. You said you can not heat on LPG, what about on electric?

If you can heat on electric, but not on LPG, close your propane tank, then open it slowly. Light the stove and make sure air is out of the LPG line. Then try to start the Alde on LPG with the battery cut off switch turned on.

See above diagram for location of bleeder valve.

dhauf · September 2018

Try this:

Also there is a bleeder valve for the glycol under the passenger side rear bench seat. If you look in the left most corner where the tear-drop starts to go up you'll see a bleeder screw.

Persistent Air Lock If air lock persists, try the following: Single-axle trailers:

1. Stop the circulation pump.

2. Lower the front of the trailer as far as possible. Leave it in this position for a few minutes to allow the air to travel upwards in the heating system.

3. Open the bleeder screw at the highest point. Leave it open until it discharges glycol fluid.

4. Raise the front of the trailer as far as possible and repeat the procedure in this position.

5. Position the trailer horizontally and start the circulation pump.

6. Check that the pipes and convectors around the vehicle are heating up.

Jaxie985 · September 2018

I’ll try that. The Alde appears to light on propane OK, the button turns green in the digital display, but then it gets the red error saying there’s air in the glycol line. I’m not seeing what’s in the pictures but will have to look more carefully and post pics.

Jaxie985 · September 2018

I found the Alde—(I have to say, my salesperson was a dud who no longer works for the dealership, and he said things like, you’ll never use the heater, so no worries. I truly didn’t know that seat even came up.)

And sure, i’ve been on the road since late June and should have checked this out before the sub-freezing nights began, but I didn’t.

I have located the main appliance and see some of the items in the diagram. The auto bleeder on top that has apparently not done it’s job (no adjustments possible on this?), the circulation pump, the hot water stopcock and drain. I haven’t pried away the panel at the back to uncover the glycol reservoir. I’m not clear on whether there is an adjustment screw on it. I also haven’t found a screw in the bottom left corner but will look again. I assume if I find a screw that looks like it’s an adjustment screee I loosen it until glycol comes out then tighten again.

Or or perhaps I find a NuCamp dealer on the road?

Sharon_is_SAM · September 2018

While you are there, check the setting on the circulation pump. It usually is set at 2. We turned ours down to 1.5 - helps eliminate noise from the glycol reservoir. The control on the Alde digital display does not alter the pump speed. You must do it manually.

ChanW · September 2018

If it were me, the first thing I'd check would be the level in the glycol reservoir - easiest and most telling.

Just a suggestion... 😎

Sharon_is_SAM · September 2018

@Chan, I agree. @Jaxie985, please first check to make sure you have adequate glycol in the reservoir. If your Alde is trapping air because the reservoir is empty, it does you no good to mess with the bleeder valve before you add glycol. If it is empty, you will need to pick up some glycol on the road, too.

ChanW · October 2018

Sharon_is_SAM said:

@Chan, I agree. @Jaxie985, please first check to make sure you have adequate glycol in the reservoir. If your Alde is trapping air because the reservoir is empty, it does you no good to mess with the bleeder valve before you add glycol. If it is empty, you will need to pick up some glycol on the road, too.

Yes. And (sorry to say, @Jaxie985, you should probably figure out why you're losing glycol!

Jaxie985 · October 2018

I finally got the problem fixed. The glycol reservoir was at the right level. I’d tried the technique of raising and lowering the front of the trailer, too. Yesterday I begged (literally) a service manager at a dealership 3000 miles from home to look st it. The water mixing valve was turned all the way off, not allowing water into the jacket area that heats it and the red overheated issue was coming from that. After adjusting it he took the black cover off the top and removed the negative terminal, waited a minute, then replaced it. Voila! Heat and hot water.

lkc001 · December 2018

Jaxie985 said:

I finally got the problem fixed. The glycol reservoir was at the right level. I’d tried the technique of raising and lowering the front of the trailer, too. Yesterday I begged (literally) a service manager at a dealership 3000 miles from home to look st it. The water mixing valve was turned all the way off, not allowing water into the jacket area that heats it and the red overheated issue was coming from that. After adjusting it he took the black cover off the top and removed the negative terminal, waited a minute, then replaced it. Voila! Heat and hot water.

I know this thread is a few months old, but can anyone post a pic of where this "water mixing valve" is located? From the sounds of what Jaxie is saying it must be close to the Alde? TIA!

Sharon_is_SAM · December 2018

If you have a 320 S, it is located under the driver side bench by the Alde. If you have a 320 CS, it is located in the area under the galley sink. Older model TaBs may have a different knob and plumbing. Not sure where the TaB 400 mixer is located.

Sharon

Image: https://us.v-cdn.net/5021717/uploads/editor/ij/gtk11vmuypa5.jpg

pthomas745 · December 2018

Here is a thread with pictures and descriptions. Your valve may not exactly be in the same spot, but they all look the same.

https://tab-rv.vanillacommunity.com/discussion/2676/little-hot-water/p1

lkc001 · December 2018

Thank you pthomas!

Verna · December 2018

The mixing valve on the T@B 400 is inside the cargo door on the driver’s side, easily accessed from the cargo door.

MuttonChops · April 2022

Automatic Air Bleeder = General Reference

Image: https://us.v-cdn.net/5021717/uploads/editor/ip/fsg2ui9oe74b.png

I recently asked Adle Technical Support to clarify the Automatic Air Bleeder operation.
Here are some helpful facts.

Question - 1 -: The User Manual briefly states N.A. units have the automatic air vent installed
          however there is no additional information on how it works.

Answer - 1 -: The auto air bleeder has a float that operates a needle valve. If air is in the system
         the float lowers and the air is bled out. There is a hose that attaches to this and is directed
         through the floor. For proper operation this hose should not be pinched and the hose outlet
         under the vehicle should be clear of debris.

Question - 2 -: Do the 'Persistent Air Lock' tips for Single -axle trailers apply/work/help when
         the automatic air vent is installed ?
                { reference manual V-3020 XX Rev XXXX, page-13 }

Answer - 2- Part one: My read of tech support answer; Yes, procedure might help clean air locks.

Answer - 2 - Part two: Longer tech support description.
      An Alde system is not always installed the same way in every vehicle. Some installations may
     have multiple elevation changes, meaning there may be convectors mounted at different heights
     and piping runs that are lower. This is why you cannot drain all the coolant just by opening the
     drain valve. This can also allow air to be trapped in certain areas. By manipulating the vehicle
     position this may allow the trapped air to move in the piping to an area where a bleed valve is
   located.

Automatic bleeder valve??

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Automatic Air Bleeder = General Reference

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