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Whale pump
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userJona
Posted: 1 April 2021 3:06 PM
Subject: Whale pump
 
Just joined

Posts: 6



Hi
should the glass of the filter be full to the top as mine as a void is this why the pump surges every 20-30 mins, or is the problem after the water as gone through the pump ?.
The only place I haven’t checked is underneath the sink as the fridge is there and I don’t think I know how to remove.
Any advice would be appreciated.
userwitzend
Posted: 1 April 2021 4:22 PM
Subject: RE: Whale pump
 


Treasured contributor

Posts: 929
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Location: Cornwall


If you need to leave the pump running for 20 to 30 mins perhaps theres something restricting the flow blocked filter ?
userDerek Uzzell
Posted: 1 April 2021 6:53 PM
Subject: RE: Whale pump
 


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Location: MODERATOR - 2015 Rapido 640F LHD 2.3ltr 150bhp


Jona owns a 2017 Peugeot Boxer-based motorhome (though I don’t think he has identified in his earlier postings its make and model which might be helpful).

The pulsing (surging) of the Whale water-pump fitted to Jona’s motorhome was discussed here last September

https://forums.outandaboutlive.co.uk/forums/Motorhomes/Motorhome-Matters/Whale-pump-pulsing/56366/

(I very much doubt that the filter not being “full to the top” has any bearing on the pump surging at 20-30 minuer intervals.)



userwitzend
Posted: 1 April 2021 8:45 PM
Subject: RE: Whale pump
 


Treasured contributor

Posts: 929
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Location: Cornwall


Derek Uzzell - 2021-04-01 6:53 PM

(I very much doubt that the filter not being “full to the top” has any bearing on the pump surging at 20-30 minuer intervals.)

my thinking was why does he need to run his pump for 30 mins if its working right thats got to be no less than 30 ltrs pumped surely some things blocked
userKeithl
Posted: 1 April 2021 8:54 PM
Subject: RE: Whale pump
 


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Posts: 5737
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Location: Birmingham. 2004 Auto-Trail Cheyenne Mercedes 313.


Glynn (Jona) said in his previous post "Hi my whale water pump pulsates every 12 to 15 minutes is there a solution." which I understand to mean that the pump starts up and runs for a few seconds every 12 to 15 minutes.

The cause for this would be either a leak in the plumbing after the pump or a failed none return valve in the pump allowing water to seep back to the tank and hence lowering the pressure causing the pump to turn on again.

Keith.
userCharles
Posted: 1 April 2021 11:17 PM
Subject: RE: Whale pump
 
Pillar of the forums

Posts: 717
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Location: Derbyshire Elddis accordo 105


Check the water heater drain, ours drips.
userDerek Uzzell
Posted: 2 April 2021 8:36 AM
Subject: RE: Whale pump
 


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Location: MODERATOR - 2015 Rapido 640F LHD 2.3ltr 150bhp


Keithl - 2021-04-01 8:54 PM

...The cause for this would be either a leak in the plumbing after the pump or a failed none return valve in the pump allowing water to seep back to the tank and hence lowering the pressure causing the pump to turn on again.

Keith.

As stated in the earlier ”Whale pump pulsing” forum discussion of last September, Whale suggests that ‘leak back’ can result in the water-pump cycling on ad off periodically when all the taps are closed - however, I think the symptoms Glynn has described (“surging” every 20-30 minutes) won’t be due to leak-back as the interval is much too long.

‘Surging’ is a characteristic of a pressure-sensitive (diaphragm) water-pump and, for surging to occur, the pump must be turned on. When the pump is turned on, even if water leaked back from the pump into the motorhome’s fresh-water tank, that should have no effect on the ‘under pressure’ water in the pipework on the pump's delivery side. As long as there is sufficient water in the fresh-water tank to cover the water pick-up and no air leak in the water system between the pick-up and the pump’s inlet, periodic all-taps-shut surging should not occur. Plainly, if there were insufficient water in the fresh-water tank or an air-leak ‘upstream’ of the pump, air would get into the system on the pump's delivery side and there would be spitting an spluttering at the taps - but Glynn makes no mention of that happening.

The logical reason for surging/pulsating occurring is (as was advised in the September thread) that pressure in the motorhome’s water system ‘downstream’ of the pump is reducing due to leakage of some sort and - if a pump only does this every 20-30 minutes - the leak would be pretty small.

If water has been heated, as the water cools and the ‘downstream of the pump’ pressure in the system subsequently lowers, it’s to be expected that the water-pump will operate occasionally untill the water has cooled right down and the pressure stabilises. But, with a ‘fully cold’ water system that has no leaks, there should be no need for the pump to run until a tap is opened.

As I said above, it might be useful to know the make and model of motorhome Glynn owns, just in case the surging is a known phenomenon for that vehicle. Also which Whale pump is fitted to it.

The Whale pump commonly fitted is the “Watermaster” model (upper image attached below also shows a filter) described on these links

https://www.whalepumps.com/rv/siteFiles/resources/docs/resource-library/cmcc_pshaw_WatermasterPumpdatasheetnocrops30-1-13.pdf

https://www.whalepumps.com/rv/siteFiles/resources/docs/resource-library/sr_766.50_v1_0513.pdf

Regarding ‘periodic cycling’ of the Watermaster pump, Whale’s advice is shown in the lower image attached below. (I notice that ‘leak back’ is not mentioned.)

There was also an earlier “Smartflo” Whale pump.

http://www.horizonleisure.co.uk/whale-universal-pressure-pump-12-litre-per-minute-uv0814.html

https://whalepumps.com/rv/siteFiles/resources/docs/resource-library/Whale_SmartfloGuide.pdf

(These pumps can be mounted in a variety of orientations - as recommended by Whale or otherwise! - and this may affect whether the filter retains some air in it or not. But, either way, air being retained inside the filter should not cause the pump to behave as Glynn has mentioned.)

If Glynn’s motorhome is an Elddis model, this 2018 forum thread may be of interest

https://forums.outandaboutlive.co.uk/forums/Motorhomes/Motorhome-Matters/Water-pump-Elddis-105/49307/

I notice that, within that thread, Charles mentioned his Whale pump’s non-return valve letting water back into the fresh-water tank, but if his water-heater’s drain-valve is leaking, that will definitely cause the water-pump to cycle periodically. (As Glynn has been able to inspect his Whale pump’s filter, at least he knows where the pump is )



(pump.jpg)



(cycling.png)



Attachments
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Attachments pump.jpg (21KB - 11 downloads)
Attachments cycling.png (31KB - 10 downloads)
userJona
Posted: 2 April 2021 7:08 PM
Subject: RE: Whale pump
 
Just joined

Posts: 6



Thanks guys I will take on board everything said.
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