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Old 09-27-2013, 05:49 PM   #1
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Hot Water Tank Bypass

Does anyone know where the hot water tank bypass is on a 1007 PUP? Is it by the water pump, I only see 2 valves and instruction manual says there should be three?

Attachment 10120[/QUOTE]
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Old 09-27-2013, 07:14 PM   #2
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I would look for it right in front of the HW tank.

There should be 1ea valve going in/out of the tank.

Then, there should be a line that connects those 2 lines.

The bypass valve has to be in that connecting piece of tubing.

Sorry I couldn't be more specific.

Any pictures of the lines near you HW tank would be helpful.

If your HW tank is under a bench, you may have to remove some screws and a panel to expose the valves you're looking for.

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Doug
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Old 09-27-2013, 07:27 PM   #3
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look for something like this




If you don't have the cross over line and valve then you may not have the bypass lines installed.

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Old 09-28-2013, 08:39 AM   #4
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The valve in the crossover isn't really necessary. If you close the valves close to the heater, that will isolate the heater from the water system. I don't know why they installed the third valve. My trailer came with one valve and a check valve at the WH output which I removed and replaced with a second 3-way manual valve.
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Old 09-29-2013, 05:04 AM   #5
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The third valve is so that when it is in the open position during winterization you can "bypass" the water heater. Otherwise you'd need 8 gallons of RV antifreeze to do the job. If the bypass valve is not present and you only close off the inlet and outlet to the water heater there could be water trapped in the supply and discharge lines which is prone to freezing. As a rule it's always a good idea to install a bypass around plumbing components like filters, tanks, heat exchangers and the like. In industrial situations it allows you to service the component without taking the entire plant down.
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Old 10-03-2013, 05:46 PM   #6
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Thanks everyone!!! I did have to remove the screwes on the one bench to get at the valves in front of the hot water tank!! Makes me wonder what the two valves by the water pump are for (not including the two lowpoint drain valves). I will take some pictures and post them shortly.
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Old 10-03-2013, 07:11 PM   #7
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The ones by the water pump are probably

1. City Water Hooked Up - One is open from City water and one is closed to the fresh water tank
2. FW Tank Used - The one from the FW tank is opened
3. If you have a loose hose about 12" long, that valve is closed except when pumping RV anti-freeze through system.

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Old 10-03-2013, 08:11 PM   #8
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In some bypass systems you only have one valve that you manipulate and a check valve that keeps anti-freeze from backing into the water heater. The valve you manipulate is on the cold water inlet at the bottom and the check valve is on the hot water outlet at the top.
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Old 10-03-2013, 08:22 PM   #9
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twood, I own a 2007 1007 PUP and was thorughly confused when I read through the owner's manual the first time I attempted to winterize my PUP. Turns out in 2007 the hot water tank did NOT come with a bypass despite the literature and manuals indicating it did. I bought some valves, adaptors, and flex-hose pipe and made my own. It was a bit more of a pain-in-the-neck than I had hoped, but it worked out OK. I think parts were about $40.
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