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Old 05-04-2018, 08:54 AM   #1
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Water System Valves

I tried to start a new thread yesterday but it never posted. We are not getting any hot water. Can someone confirm there are only 2 valves for the water system-one on the blue (cold water) pipe and one on the white as pictured in the attachment in post below?
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Old 05-04-2018, 09:00 AM   #2
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Pic for reference from another thread
Quote:
Originally Posted by Steeljag View Post
Outside compartment behind rear wheels, passenger side, behind black panel door. Attachment 168265
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Old 05-04-2018, 09:19 AM   #3
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Sounds as if your heater is on by pass. There should be three valves, one in, one out, and a connecting line between the two with a valve. For system use the red and blue should be open and the connecting line between the two should be closed.
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Old 05-04-2018, 09:21 AM   #4
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Had the same issue. Sounds like you have not opened the third valve. For me it was the one in the middle that connected the two lines.
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Old 05-04-2018, 09:32 AM   #5
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Quote:
Originally Posted by Mr. Dan View Post
Pic for reference from another thread
That is the antifreeze flush valve. There are 3 valves on the HWH, the top should be open, the bottom should be open and the middle one should be closed.

BTW, the attachment shows a common FR issue. The antifreeze valve is installed backwards. When the handle points at the pump that means the flush is turned off and you should have water from the tank. The valve is designed to be installed the other way. When the handle points at the tank, you get tank water, when the handle points at the flush hose you can suck up antifreeze. No foul, no harm, guess they put them in that way since somebody wants the flush hose to point up!
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Old 05-04-2018, 09:45 AM   #6
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There are a number of ways that water heaters are plumbed. Most have the basic 3 valve system like this:


Name:   Hot water bypass #1.jpg
Views: 92
Size:  15.2 KB


But there are others using 3-way valves and/or check valves. See page 2 of the attached generic plumbing pic.
Attached Files
File Type: pdf RV Plumbing pic.pdf (125.9 KB, 12 views)
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