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Old 08-06-2019, 11:04 PM   #15
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thanks for the update......


Reminds me of an old joke.
Punch Line
'Green side UP'


In this case......arrow points OUT
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Old 08-09-2019, 09:46 AM   #16
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Hot water pump?

Hey Old Biscuit is it true that I would have to have the water pump on whether I'm on city water or tank water to make the hot water work? I was told by the RV dealer that either way i need to turn on the pump to both circulate and boost the pressure for the hot water tank. I thought the pump was only for using water in the fresh water tank.
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Old 08-09-2019, 01:14 PM   #17
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It is not common practice to use your on board water pump when hooked up to city water.
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Old 08-09-2019, 01:30 PM   #18
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Quote:
Originally Posted by Drive4life View Post
Hey Old Biscuit is it true that I would have to have the water pump on whether I'm on city water or tank water to make the hot water work? I was told by the RV dealer that either way i need to turn on the pump to both circulate and boost the pressure for the hot water tank. I thought the pump was only for using water in the fresh water tank.



Water pump has a PRESSURE Switch
System pressure has to drop to/below Start Set point in order for pump to run
System pressure increases enough to trip Stop set point and pump stops running


When connected to City Water the pump can be ON but will NOT run unless system pressure drops to/below pump start set point


If city water pressure is low enough for pump to start the pump discharge pressure will be higher then the city water pressure so the 'check valve' in the city water assembly closes so pump does NOT backfeed water into city water source.


When on city water...pump internal check valve stops backflow thru pump so fresh water tank doesn't overflow from using city water source



City Water AND pump discharge go to same COLD water line off of which is cold inlet to water heater.
So either source supplies water heater and will force water out into hot water lines when a Faucet/Shower hot side is opened.
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Old 08-09-2019, 04:19 PM   #19
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This guy said there's a pump under the kitchen sink that aids the hot water re circulation that turns off and on when using hot water. I told him I found they put the hot water out check valve in backwards and I have hot water now but he told me to make sure the pump was on even if i was using city water I not sure I buy that.
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Old 08-09-2019, 04:24 PM   #20
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No Hot water 2005 Dolphin

On my Dolphin I need to leave the pump on when when connected and valves positioned for city water in order to have good water pressure. I canít use a pressure regulator at the campground water spicket. I havenít looked but it may have a regulator built onto the water inlet connection? I know some boat connections do. I really havenít looked into it throughly, even if Campground water psi is 40 itís not enough.
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Old 08-09-2019, 05:07 PM   #21
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tmw188 Your city water inlet has a built in regulator.
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Old 08-09-2019, 05:30 PM   #22
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IS there a pump under your kitchen sink?


IS that the RV Pump or an extra auxiliary pump? (Doubtful)


IF CG water pressure is 40# then your RV Pump will probably be needed....for cold AND hot water use


Depending on which pump......
Some are 45# (start set point at 30#)
Some are 55# (start set point at 40#)


50# is a GOOD pressure for RV Systems...what most regulators are set for
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Old 08-09-2019, 09:00 PM   #23
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Sounds like an aftermarket recirculating hot water pump was installed.


The 2005 Dolphin water pump is located in the service bay ,drivers side behind the plate with valve handles and water connections.
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Old 08-09-2019, 09:21 PM   #24
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Quote:
Originally Posted by Richard S. View Post
tmw188 Your city water inlet has a built in regulator.


Thatís what I thought, I know my boats did.
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Old 08-09-2019, 09:24 PM   #25
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Quote:
Originally Posted by Richard S. View Post
Sounds like an aftermarket recirculating hot water pump was installed.


The 2005 Dolphin water pump is located in the service bay ,drivers side behind the plate with valve handles and water connections.


That is correct.
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Old 08-09-2019, 09:28 PM   #26
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Quote:
Originally Posted by Old-Biscuit View Post
IS there a pump under your kitchen sink?


IS that the RV Pump or an extra auxiliary pump? (Doubtful)


IF CG water pressure is 40# then your RV Pump will probably be needed....for cold AND hot water use


Depending on which pump......
Some are 45# (start set point at 30#)
Some are 55# (start set point at 40#)


50# is a GOOD pressure for RV Systems...what most regulators are set for


No aux pump. There is however a dedicated inline filter for a stand alone pencil fixture I call it? I donít use it and assume itís on the cold line.
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Old 08-10-2019, 10:57 AM   #27
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No aux pump. There is however a dedicated inline filter for a stand alone pencil fixture I call it? I donít use it and assume itís on the cold line.

the questions were for Drive4Life...the OP of this thread
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Old 08-10-2019, 02:12 PM   #28
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Donít know why I answered that
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