Grundfos submersible pump [RE-wrenches]
Matt Tritt
solarone at charter.net
Tue Apr 22 18:17:36 PDT 2008
<x-flowed>
Bruce,
This is a common problem with pumps that use anode type water sensors,
regardless of make. Water is sensed by conductivity between the anode
and the pump case, so if something occurs to interfere, such as algae,
iron oxide, calcium deposits and other minerals that effectively screw
up the "normal" conductance of fresh water, the controller won't react
appropriately. This is why some companies use a float actuated micro
switch enclosed within a protective cage, which I believe is a better
method.
Matt T
Bruce Erickson wrote:
>
>
> Hi Jay,
>
> We recently hired a pump company to pull an AC pump we were replacing
> with an SQ Flex. The operator mentioned that he has seen several
> instances of algae or other gunk buildup on the Grundfos low water
> sensor just above the pump, which was "shorting" the sensor, fooling
> it into thinking there was still water present. His fix was to scrub
> it off with bleach.
>
> Bruce Erickson
> Mendocino Solar Service
> 707-937-1701
> 707-937-1741 fax
> PO Box 1252
> Mendocino, CA 95460
>
>
> 
> "Serving the Solar System"
>
>
>
>
>
> On Apr 20, 2008, at 6:17 PM, Jay Peltz, Peltz Power wrote:
>
>>
>> HI All,
>>
>> On a different Grundfos note, I think I have a failure with a SQFlex.
>>
>> ( its running on AC power, well within head specs)
>>
>> The low water shut down isn't working and the flow has dropped,
>>
>> Anybody seen problems like this?
>>
>> And does anyone know the direct line to tech support?
>>
>> thanks,
>> jay
>>
>> peltz power
>>
>>
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