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Old 09-05-2016, 05:33 PM   #1
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Water Heater Bypass - Am I missing something?

We have two more trips planned, but I'm getting myself familiar with everything to winterize after Halloween. I must be missing something here. The pictures I took of the valve system. Please explain to me how this bypasses the water heater all together.

Edit: I wanted to clarify that I was trying to understand this system. It seems to be that water has to go through the water heater no matter what unless the valve on the bottom diverts the water bypassing the cold inlet? Most valves are on and off correct?

Also the box just lying in the floor. Should that be mounted somewhere?

Don't mind the wood shavings. I'll be getting those as soon as it cools down a little. Thanks FR!
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Old 09-05-2016, 05:46 PM   #2
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Looks like they've combined the bypass valve and the cold water inlet valve into a single 3-way valve.

I would assume you'd turn the handle up to be in parallel with the red line, and close the hot water outlet valve and you'd be ready to winterize.
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Old 09-05-2016, 05:47 PM   #3
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It looks like the two valves on the HW system need to be moved in to their closed position (90o from where they are pictured right now). That would stop cold supply water running into the bottom of the tank and water drains out from the top end into the red hot water pipes. Most systems I have seen have a third valve in the vertical pipe that links the hot water supply and the cold water feed. Evidently, yours doesn't so not to worry. I can only think the valve on the cold supply is a three way valve that opens the link when it closes the cold supply.

As for the electronic box; I'm not sure what that is but it looks suspiciously like the back end of a thermostat controller. Whatever it is I would want it mount off the floor it it was mine - just to reduce the possibility of water getting in there if there was ever a leak.
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Old 09-05-2016, 05:48 PM   #4
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This may help...
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Old 09-05-2016, 06:24 PM   #5
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Except his doesn't look like your pic, that's why he's asking.
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Old 09-05-2016, 06:37 PM   #6
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Picture shows 2 valves, one on the hot and one on the cold.
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Old 09-05-2016, 06:51 PM   #7
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There may be a check valve on the outlet side of the WH. I don't have a third valve on my WH. The three way valve eliminates the valve between the hot and cold lines.
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Old 09-05-2016, 06:56 PM   #8
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The winterizations valves and total number of, differ between RV's.

You can have only one (which uses internal backflow preventers to keep water only flowing one way).

You can have three, which has manual valves to shut off cold water into the tank, and water from backflowing into the tank via the hot water line, once you open up the crossover valve.

You can also have two valves, like you do. You just have the cold water inlet and crossover line using one valve...and then the hot water outlet line on another valve.

On your system, when the valve handle is parallel with the line, then it's open. Your first pic shows the cold water inlet (blue)line as open and water flowing into the tank. Since the line is open, the crossover(bypass) red line is closed, so no water can flow thru it.

You also have the top valve open, so water can flow out of the tank once it's heated (red lines).

To bypass your system, you just change the position of the bottom valve so water can not enter the tank and goes to the crossover line (into hot water line). Now since cold water is going into the hot water line, it would backfill the tank unless you ALSO close off the top hot water line outlet valve.

This link explains the winterization process, and I edited your pic somewhat to help too.

NO (OR MINIMAL) HOT WATER (Please read first)

In the pic edit below. The first sentence for each valve is how you want it for normal use. The second sentence is for winterization and the hot water tank bypassed so you can add antifreeze to the cold and hot water lines...all explained in the link above.
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Old 09-05-2016, 07:00 PM   #9
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This is the "Two Valve" system. There is no check valve in a 2 valve system.

Thank you for a GREAT photo of a 2 valve winterizing setup.

To winterize:

Rotate the bottom valve to vertical so it is pointed up. Then close the outlet valve (rotate so the arm is pointing away from the Styrofoam body).

Then DRAIN (and NOT before you close those valves!) from the outside drain outlet. Draining the hot water heater using the low point drains will draw sediment and calcium/anode bits into your cold water pipes causing all kinds of headaches next spring.
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Old 09-06-2016, 05:20 AM   #10
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Quote:
Originally Posted by wmtire View Post
The winterizations valves and total number of, differ between RV's.

You can have only one (which uses internal backflow preventers to keep water only flowing one way).

You can have three, which has manual valves to shut off cold water into the tank, and water from backflowing into the tank via the hot water line, once you open up the crossover valve.

You can also have two valves, like you do. You just have the cold water inlet and crossover line using one valve...and then the hot water outlet line on another valve.

On your system, when the valve handle is parallel with the line, then it's open. Your first pic shows the cold water inlet (blue)line as open and water flowing into the tank. Since the line is open, the crossover(bypass) red line is closed, so no water can flow thru it.

You also have the top valve open, so water can flow out of the tank once it's heated (red lines).

To bypass your system, you just change the position of the bottom valve so water can not enter the tank and goes to the crossover line (into hot water line). Now since cold water is going into the hot water line, it would backfill the tank unless you ALSO close off the top hot water line outlet valve.

This link explains the winterization process, and I edited your pic somewhat to help too.

NO (OR MINIMAL) HOT WATER (Please read first)

In the pic edit below. The first sentence for each valve is how you want it for normal use. The second sentence is for winterization and the hot water tank bypassed so you can add antifreeze to the cold and hot water lines...all explained in the link above.
Thank you for the description and picture. Knowing it's a 3 way valve makes sense.
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