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Old 02-18-2011, 03:25 PM   #1
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How does it work?

Class A water system. When filling the fresh tank with city water using the bypass valve, does the bypass valve simply open the pressurized water system which causes the pump to pump continuously? If so, is the pump running dry? If so, does this mean the bypass valve prevents fresh water from the fresh tank from flowing into the pump?

Or, is it pumping water from the fresh tank? If so, where is the water going?
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Old 02-18-2011, 03:33 PM   #2
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Hi kgarvey,
When the bypass valve is opened it relieves PSI downstream from the pump. As best I can tell the pump will pump water back into the fresh water tank as it tries to increase PSI in the line. Different coaches may be plumbed differently.
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Old 02-18-2011, 03:43 PM   #3
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Kgarvey -

Yes, the bypass valve redirects the inflow of water from the coach water system into the tank. You would normally have your pump turned off while filling the fresh water tank from the city supply. Once the tank is as full as you want it to be, you switch the valve back to the other position.

I generally don't run my pump when connected to a city (or campground) water supply but I understand some people do to get better pressure when they encounter low pressure situations.
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Old 02-18-2011, 03:43 PM   #4
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Shut off pump.
Fill fresh water tank.
Turn pump back on.
When hooked to city water the pump does not need to be on.
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Old 02-18-2011, 03:45 PM   #5
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Yep! Shut the pump off until you fill the water tank.
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Old 02-19-2011, 05:11 AM   #6
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A lot of people also recommend that you open the direct side fill while filling with the bypass valve. This is to make sure that the air is venting out of the tank(s) fast enough. I have read claims of tanks expanding and causing problems if the air pressure builds up enough in the tank(s).

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Old 02-19-2011, 05:16 AM   #7
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On our Windsport or 60 gal. water tank has 2 over flow tubes. No air trapping when filling. We never have pump on when hooked up to water line at home or camping.
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Old 02-19-2011, 05:37 AM   #8
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We fill the same way. Pump off then fill. Have been at CGs where the pressure was so low that we filled the tank at an off peak usage time (E.G. not morning shower time) then use the pump for the shower or dishwasher.
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