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1997 Country Coach water pressure pulsing
At low flow volumes the water pump turns on and off repeatedly. When the flow is increased the pulsing stops. The water pump is a Surflo 4048 made in 2014 but the way it is implemented by-passes the pressure switch on the water pump itself and instead uses an external Furnas Electric Co. pressure switch 60WA4 to turn the pump on and off in response to pressure. That Furnas unit simply either interrupts or connects the positive wire going to the pump. There are two set screws. One says “turn clockwise to increase both cut-out and cut-in pressure”. The other says “turn clockwise to increase cut-out pressure without affecting cut-in”.
Which of these should I turn, and in which direction, to stop the low flow pulsing? Or, should I do away with the Furnas pressure switch and use the one built into the water pump?
Thanks for your collective thoughts.
Jerry
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8 Replies
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Jerry,
Do you have a bladder tank? If so have you checked to see if its functioning properly? This sounds like a bladder tank issue.
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Jerry I agree with Jeff. Mine was doing the same thing before a complete water bay re-do last summer. When I removed the pressure tank I discovered the issue. The whole tank was water logged, it’s supposed to have a rubber bladder to separate air/water inside which balances the water demand. The bladders get a leak in them and the whole tank fills with water pressure.
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I understand the way to test the pressure tank is to press the air valve and if water comes out your tank is bad. If not, fill the tank to 30-35 psi and your good.
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Not necessarily, Roy. If water does come out the accumulator is no good for sure, but it could be as simple as the pressure has been lost and repressurizing the accumulator could be all that is necessary.
Accumulators are so cheap if they are 15 or more years it makes sense to just change them.
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If you havent yet, try to not adjust the pressure switch yet. I believe you are gonna find the trouble is related to the tank.
Theres good info on the net about water pressure tank psi but I believe you want it aired to about 2 psi below whatever pressure your water pumps come on at when they are called upon. You can watch your pressure gauge while cracking a faucet open and listening for the pump to come on to get an approximate idea of the low pressure cut-on. Mine isnt exact but thats how I got it close. Hope this helps.
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Jerry,
Has this ever worked without surging? My CC does not have any kind of accumulator tank and we have the same setup as you for the pressure switch. Ours goes to 2 pumps, however. There is some surging at low pressure but nothing that has ever concerned me.
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No pressure tank in mine, either. I think the easiest is just to install the new pump dated 2020 and use its internal pressure valve. The existing one dated 2014 is the same pump but was installed removing the wires to the internal pressure valve and using the external on-off valve instead.
I did not notice the surging before this last winter trip to SW and Mexico.
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Installed the new pump and removed the external pressure switch. All works as it should now, no surging and good pressure.
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