That is a 1 valve system. Turn the valve that you have labeled "shut-off/by-pass??" in line with the vertical line....that is the bypass line. That shuts water off going into the water heater, and directs the water flow to the bypass line. There should be check valve in the top line at the water heater so that water cannot flow back into the water heater.....it can only come out of that line.
I had a 1 valve system with the check valve installed in my Trailmanor, and it worked well. 1 valve to set up instead of 3.
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Chap , DW Joy, and Fur Baby Sango
2017 F350 Lariat CCSB, SRW, 4x4, 6.7 PS
2017 Grand Design Reflection 337RLS
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