Periodic partial draining of Alde hot water tank.

BillCB · September 1

I know the recommended way of restoring the air space in the tank is to open the yellow valves under the bed (T@B 400) but it's a hassle. Why is it not equally effective simply to open the hot water valve under the camper by the driver side wheel? (Pump off and pressure released.) Much easier than taking the bed apart.

What am I missing?

MuttonChops · September 1

Just a Guess.

The Low Point HW Drain is after the TMV (hot-cold mixing valve),
The Yellow Pressure Relief Valve is directly connected to the Adle water tank.

Using the Yellow Valve as documented in the Alde manual insures resetting the air cushion.

EPOD1 · September 1

I am not a fan of lifting the bed unless I have to fix something or winterize. Recently we added double sized purple mattress and just love it. I will get into the details in another post but having that wonderful mattress makes for a pain to lift the under bed panels.

To solve the issue of resetting the air cushion I might consider moving all valves for drainage to an exterior control.

ScottG · September 1

On my 2015 320, opening the low point COLD water drain will also drain the Alde. Cold water enters at the bottom of the boiler and HW exits at the top, so draining (regardless of the method) is typically through the CW feed.

Not sure if it will work the same on your 400, but might be worth looking into.

BillCB · September 4

Thank you all. If one is near a town water source one could presumably drain the whole system and then power fill. Much easier than removing the bed "springs", mattresses and topper.

I usually only travel with one-third tank full (unless I'm really boondocking for a week) so the time to drain would be just about the time to have a nice glass of wine while waiting….

Mickerly · September 5

It depends on the installation. If the Alde is by itself, opening the cold water drain should drain the hot water tank. If there is an Alde Flow, this doesn't work. You need to use the yellow pressure relief valve.

Newer then 2023 may have a different design.

BillCB · September 6

Thank you Mickerly. It is an Alde Flow so I guess I'll have to play by the rules.

Bill

MuttonChops · September 6

https://tab-rv.vanillacommunity.com/discussion/comment/222970#Comment_222970

Reference:

Periodic partial draining of Alde hot water tank.

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