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 > Reefer drain hose thingy ma bob

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dougrainer

Carrolton, Texas

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Posted: 07/11/18 06:20am Link  |  Quote  |  Print  |  Notify Moderator

On Dometic refers, the end of the drain hose has a cap with small holes, that does 2 things, to prevent insects going up and to restrict a small amount of air from going back up into the refer. When installing the refer, they supply a LOT of extra white drain hose for the installer to either loop and make a P-Trap to stop air intrusion. I HAVE NEVER SEEN AN OEM INSTALL IT THIS WAY.
On Norcold Refers, they have a drain cup next to the burner flue with the drain hose installed in that cup. On the end is a plastic check valve that opens when water fills the drain tube. DO NOT allow the end to lay in the drain cup. lift it up a 1/2 inch and have it dangle just above the drain cup. That will allow the check valve to do its job and not get clogged up. Clogged up Norcold drain check valves are very common. Doug

pnichols

Santa Cruz Mountains

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Posted: 07/11/18 03:28pm Link  |  Quote  |  Print  |  Notify Moderator

dougrainer wrote:

DO NOT allow the end to lay in the drain cup. lift it up a 1/2 inch and have it dangle just above the drain cup. That will allow the check valve to do its job and not get clogged up.


How does allowing the end to lay in the drain cup prevent the one-way check valve from letting water drain out of the line into the drain cup?


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dougrainer

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Posted: 07/11/18 06:33pm Link  |  Quote  |  Print  |  Notify Moderator

pnichols wrote:

dougrainer wrote:

DO NOT allow the end to lay in the drain cup. lift it up a 1/2 inch and have it dangle just above the drain cup. That will allow the check valve to do its job and not get clogged up.


How does allowing the end to lay in the drain cup prevent the one-way check valve from letting water drain out of the line into the drain cup?


WHAT I am saying, is, to PREVENT the check valve from getting gummed up and NOT working, do not lay it in the drain cup. I did not say it would prevent the drain check valve from working. I guess you are just ONE OF THOSE PEOPLE, has to argue everything[emoticon] Doug

pnichols

Santa Cruz Mountains

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Posted: 07/11/18 07:07pm Link  |  Quote  |  Print  |  Notify Moderator

Doug ... I don't argue ... I question statements that mislead unintentionally via not describing situations clearly enough.

I still wonder how the valve can get clogged up from laying temporarily in water that might collect from the refrigerator's interior in the Norcold drain cup before it soon evaporates due to warmth from being close to the burner?

What's coming out of the valve into the drain cup is water - not crud that can clog it. [emoticon]

enblethen

Moses Lake, WA

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Posted: 07/11/18 09:09pm Link  |  Quote  |  Print  |  Notify Moderator

The refer exterior access will get dirty from the roads. Dust and other debris can lay in bottom of the cup.
The water from the refer is not always the cleanest. It should be, but it is not always. Some materials fall off the cooling fins into the tray that ends upmin cup or inside the tube blocked by the "filter".


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pnichols

Santa Cruz Mountains

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Posted: 07/11/18 09:40pm Link  |  Quote  |  Print  |  Notify Moderator

enblethen wrote:

The refer exterior access will get dirty from the roads. Dust and other debris can lay in bottom of the cup.
The water from the refer is not always the cleanest. It should be, but it is not always. Some materials fall off the cooling fins into the tray that ends upmin cup or inside the tube blocked by the "filter".


Thanks for the clear detail. That makes sense as to what could happen under certain conditions.

I'm guessing that Norcold engineering's reason for the collection tray is to keep water off the floor of the refrigerator cabinet (and maybe off of the RV's floor) by providing a tray to hold this refrig (defrost?) water for a bit until it evaporates quickly from burner warmth.

enblethen

Moses Lake, WA

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Posted: 07/12/18 06:45am Link  |  Quote  |  Print  |  Notify Moderator

Problem with the cup, is it can overflow and put water on the "floor" area of the refer causing it to rot out.
I would extend the hose, attach it to the vent cover so the end is sticking slightly out of the vent. Make sure it has a trap. It should be part of "start" of season cleaning.

vermilye

Oswego, NY, USA

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Posted: 07/12/18 09:40am Link  |  Quote  |  Print  |  Notify Moderator

One recommendation I've seen is to place a balloon with the tip cut off over the end of the hose (making the equivalent of a HepvO valve. Lets the water out, but keeps bugs and warm air from getting in. No idea if it actually works, but I've met a couple of people that swear by it. You might ask Doug if it is practical...


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