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Old 01-12-2019, 12:36 PM   #1
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Added water pressure.

In our old H.R. M H when we were at RV parks I always turned on the coach water pump in addition to the city water. Gives you more water pressure in the coach. In the C. S. 3856 I can't doe this. The house water pump works only if not connected to city water. Is there a valve or something that needs to be turned to make both work at the same time?
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Old 01-12-2019, 03:41 PM   #2
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Hi old golfer guy,
There should be no reason why the coach water pump will not work when connected to shore water. Doesn't make sense. Consider calling Newmar CS. Have your coach number handy.

The only reason I can think of for the water pump not to turn on is the shore water supply is sufficient enough so the pressure inside the coach water lines does not drop enough to signal the pump to turn on.
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Old 01-12-2019, 03:51 PM   #3
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I've never owned or even heard of a coach that works that way. It sounds like the shore pressure is equal to or greater than what the water pump will produce. Has this happened at more than one campground.

I just can' imagine any reason they would plumb the pump t not run with shore water. If it's happened more than once, maybe you have some winterizing valves in the wrong position.
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Old 01-12-2019, 03:53 PM   #4
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City water and pump supply SAME cold water line....off of which a cold water inlet goes to Water Heater to fed hot water lines


Pump has a pressure switch which starts/stops pump when pump power is on.
(On doesn't mean it runs)
When connected to city water and supply RV plumbing system the city water pressure MUST drop low enough for pump pressure switch to Close and start the pump. When pressure in system goes high enough pump pressure switch Opens and stops pump.
With pump running the city water inlet check valve closes...opens when pump shuts down

One or other water sources...not both


Your present coach....
Do you have to swap a valve/switch to control water

City Water----Fill-----Normal (pump)?????
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Old 01-13-2019, 01:54 PM   #5
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Hi - I think there is some misunderstanding about both flow and pressure and how they interact. Running the pump along with the city water will increase flow (gpm) and may also increase pressure (psi). Given those variables it is possible to have water from both sources at the same time. I sometimes shower with the pump when on city hookup and the reduction in the tank level is less than if I use just the onboard water.



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Old 01-13-2019, 02:12 PM   #6
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Quote:
Originally Posted by Ricci View Post
Hi - I think there is some misunderstanding about both flow and pressure and how they interact. Running the pump along with the city water will increase flow (gpm) and may also increase pressure (psi). Given those variables it is possible to have water from both sources at the same time. I sometimes shower with the pump when on city hookup and the reduction in the tank level is less than if I use just the onboard water.




Tom

Pump can't start unless city water Pressure is low enough for pump Pressure Switch to Close
Pump then increases pressure AND Flow in plumbing system
Increased pressure from pump will CLOSE the spring loaded check valve inside the city water inlet.....otherwise pump would push water into city water system via hose.


When system pressure goes high enough pump pressure switch will Open and city water will then flow again


1# higher pressure via pump will close the city water check valve
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Old 01-13-2019, 04:20 PM   #7
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Would suggest check or changing water filter. Most of the time when I assist Newmar owners we find that to be the biggest issue. We also use a adjustable water pressure regulator which has a 1/2 inlet and exit. Almost all 7 to 10 dollar water pressure regulators use a 1/4 or maybe 5/16 inlet/outlet which really reduces your water flow. On our LA when we use both the shore water and the coach water pump the coach pump has more pressure so that is were the water comes for the coach when both are on. Shouldn't need to use fresh coach water pump unless the park has a problem. Maybe once every 50 parks do we find our selves using coach water pump.
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