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Old 10-18-2013, 05:30 PM   #11
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Originally Posted by Cosmik Debris View Post
By "on demand" are you talking about a pump with pressure adjustment? I knew that I had read about using an accumulator with one and found the forum.
http://lanceowners.hoop.la/topic/shu...008-adjustment
What this person found was that there was no need for an accumulator with this pump.
On my old TT I installed an accumulator and it was a nice mod, but haven't looked into do it on my new 2013 Jayco. Your question has me thinking that I should check the model of pump first to see if the tank would be needed.
Cosmic, thanks for the link to the Lance forum. The 'on demand' pump on my current unit, unlike my previous one, has no shut off and start up pressure setting. ( The old unit's pump shut off at 42 lbs and came back on at 28, thus making an accumulator useful). My new one simply comes on when I open the tap and stays on until I shut it regardless of the flow, thus not requiring an accumulator. I guess if I really wanted the pump not to come on at night but still have water for a few flushes I could still install the accumulator and shut the pump of at night.

cheers and have a great day.
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Old 10-18-2013, 06:20 PM   #12
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The pump on my new Greyhawk is a demand pump. Most of these pumps use a spring return valve that allows water to return to the low pressure side when you have the tap partially open. That said it doesn't eliminate the need for an accumulator. The pump is still running and using (wasting) energy. An accumulator allows the pump to stop running when the tank is full even if water is still being used. The pump will run at full volume fill up the tank then stop until the pressure drops below the pump set point. This is much more efficient and better for the pump. There are variable speed pumps that are incompatible with accumulators. If you have one of those then you can't use an accumulator.
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Old 11-02-2013, 06:07 AM   #13
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Originally Posted by TeamFoxy View Post
I can see having the accumulator on a TT if you operate on tanks most of the time, but a waste of time if you are at campsites with a city water connection most of the time.
We always use the installed pump, even at a FHU site. It protects us from damaging pressure spikes, and we only use campground water to refill the onboard tank. Walking away from an RV and leaving it connected to an inexhaustible water supply isn't a good idea. Many an RV'er has returned from dinner to find water running out the door. By running on the onboard tank/pump and turning it off when we leave, we lessen the risk of damage. The worst case scenario would be springing a leak, in which case the residual pressure in the line would seep some water out, but there is no chance for major flooding.
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Old 11-02-2013, 10:52 AM   #14
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Originally Posted by northmeck0255 View Post
We always use the installed pump, even at a FHU site. It protects us from damaging pressure spikes, and we only use campground water to refill the onboard tank. Walking away from an RV and leaving it connected to an inexhaustible water supply isn't a good idea. Many an RV'er has returned from dinner to find water running out the door. By running on the onboard tank/pump and turning it off when we leave, we lessen the risk of damage. The worst case scenario would be springing a leak, in which case the residual pressure in the line would seep some water out, but there is no chance for major flooding.
I heard of an incident where a cat hit the kitchen fawcet lever, the sink filled and overflowed which flooded the camper. Ever since hearing this story, we have always turn the water spigot off when leaving our 5er.
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