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Old 15-04-2018, 11:33   #1
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Domestic Water Pump coming on in short 2 secs bursts while running taps.

Hi
Can anybody help with this, it happens with both hot and cold the cold has better pressure. It's at all taps inc taps & showers in en suites.
Thanks in advance,
Ken.
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Old 15-04-2018, 11:54   #2
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Re: Domestic Water Pump coming on in short 2 secs bursts while running taps.

As you turn it up to higher flow, does the pump start to run constantly? If so then the pump is working as intended. It's an "on demand" pump and at lower flow it will cycle intermittently...putting pressure in the line and then shutting off until the pressure falls. As you increase flow it has to run constantly to supply the required flow.

Cold may have better pressure as it does not need to pump water through the water heater.
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Old 15-04-2018, 13:03   #3
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Re: Domestic Water Pump coming on in short 2 secs bursts while running taps.

No it doesn't, eg, when the shower is on the pressure is ok and constant, but the pump continues to cut in and out every 2/3 secs.
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Old 15-04-2018, 14:34   #4
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Re: Domestic Water Pump coming on in short 2 secs bursts while running taps.

The only pressurized water storage vessel on boats is the pipes themselves. At pressure, the pump is off automatically, but as soon as you open a tap or shower, the pressure drops instantly and the pump kicks on. The pump flow is greater than the tap flows, so the pressure builds back in seconds and the pump shuts off. And repeats. I’d expect that if you opened enough taps at once till your flow exceeded the pump output, the cycling would stop, and the pump would run continuously. Get a small accumulator tank on the outflow side of your pump. Their job is to reduce short-cycling of the pump.
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Old 15-04-2018, 14:50   #5
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Re: Domestic Water Pump coming on in short 2 secs bursts while running taps.

Sounds like you have a pressure tank in your system and bladder has gone.


This will cause the symptoms you describe.


https://www.freshwatersystems.com/c-...ell-tanks.aspx


See post above from Pockets as well.
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Old 15-04-2018, 15:39   #6
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Re: Domestic Water Pump coming on in short 2 secs bursts while running taps.

If you have an accumulator tank, test the valve and see if air hisses out. If not the air bladder may have an air leak in it, or the valve is faulty, try pumping it up again with a bike pump and see if that changes things.
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Old 15-04-2018, 21:19   #7
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Re: Domestic Water Pump coming on in short 2 secs bursts while running taps.

An accumulator tank can also have more air pressure in it than the pumps cut off pressure rendering it inneffective.
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Old 16-04-2018, 06:12   #8
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Re: Domestic Water Pump coming on in short 2 secs bursts while running taps.

Quote:
Originally Posted by Thumbs Up View Post
An accumulator tank can also have more air pressure in it than the pumps cut off pressure rendering it inneffective.
Thatís why accumulator tank static pressures are typically set at, or just below, the pumps cut-on pressure.
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Old 16-04-2018, 06:33   #9
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Re: Domestic Water Pump coming on in short 2 secs bursts while running taps.

I use a filter inline installed in a standard filter housing (11" I think) but I mount the housing upside down which creates an air pocket and functions as a small accumulator
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Old 16-04-2018, 08:14   #10
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Re: Domestic Water Pump coming on in short 2 secs bursts while running taps.

If your boat is not equipped with an accumulator tank, the pump is running as it should. If she has an accumulator tank, the air charge has leaked out - but no matter, other than the noise stopping and starting, it is working ok.

We like the noise, it reminds us we are using a limited supply of water.
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Old 16-04-2018, 08:44   #11
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Re: Domestic Water Pump coming on in short 2 secs bursts while running taps.

This is obviously an accumulator tank problem and the previous posts have well covered that subject. If you donít resolve this problem you will shorten the life of the pump.

There are pumps designed to operate without an accumulator tank. Jabsco makes a pump that varies the speed of the motor so that it can run continuously while there is a demand. ShurFlo accomplishes this by putting a bypass into the discharge that feeds excess water back to the intake side of the pump.
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Old 16-04-2018, 09:43   #12
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Re: Domestic Water Pump coming on in short 2 secs bursts while running taps.

Quote:
Originally Posted by Ipapadi View Post
Hi
Can anybody help with this, it happens with both hot and cold the cold has better pressure. It's at all taps inc taps & showers in en suites.
Thanks in advance,
Ken.
Your pressure tank has a bladder that is perforated and therefore does not take pressure. Replace pressure tank...
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