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What's this sediment in my pump discharge line?
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humanoid37
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humanoid37
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Posted Tue Jul 30, 2013, 2:32pm
Subject: What's this sediment in my pump discharge line?
 

Examining my new machine, I'm not sure why there would be a whole lot of white crusty sediment in this pump discharge line (silicone tube)... should I be concerned that this is a sign of abuse by the previous owner? Or is this normal... My understanding (= limited understanding!) is that cold water from the pump, would exit out of this line if it exceeds the set pressure (e.g. 9 bar). So why would there be lumps of calcification clogging up the tube? Wouldn't water have to be sitting idle in this line for some time? Wouldn't it have to be hot water? Did a spider crawl up the drain line and make a nest here? My mind is boggling... I bet there's a simple explanation somewhere... you can't see the sediment in this pic, but trust me, there are several lumps along its length.

humanoid37: drain tube.jpg
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frcn
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Posted Tue Jul 30, 2013, 3:25pm
Subject: Re: What's this sediment in my pump discharge line?
 

Are you assuming that it is calcification or do you know? it was hard to tell from the photo. It could just be fogging, it could be desacaling residue, something growing from well water use maybe (no chlorine), or from chlorine?

 
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humanoid37
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humanoid37
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Posted Wed Jul 31, 2013, 1:51am
Subject: Re: What's this sediment in my pump discharge line?
 

frcn Said:

Are you assuming that it is calcification or do you know? it was hard to tell from the photo. It could just be fogging, it could be desacaling residue, something growing from well water use maybe (no chlorine), or from chlorine?

Posted July 30, 2013 link

Hi frcn, thanks for the feedback!

Calcification / scale was my first guess. It's white and when you squeeze the silicon hose it crackles and breaks, but it's pretty thick - and there are a few of these lumps in the line. In any event I will simply detach the hose and clean it out. I just wondered if it was a well known warning sign of something going wrong in earlier operation... I'm always a bit parnoid when buying second hand machines. But in any event I'll continue with the descaling of HX and boiler and hopefully everything will be working smoothly!
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frcn
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frcn
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Posted Wed Jul 31, 2013, 9:46am
Subject: Re: What's this sediment in my pump discharge line?
 

If the machine had been run on a softening system it is possible that it is mineral deposits, but not the "true" scaling sort.. maybe. One thing you can do is pull the water level probe and see if that is scaled and then make decisions based on that.

Remove the wire connector from the probe then unscrew the entire assembly (by turning the hex fitting closest to the boiler). If there is scale you do not want to pull the probe wire out as the scale on the probe can damage the insulating seal.

What machine is this?

 
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matster
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Posted Sat Aug 24, 2013, 3:09pm
Subject: Re: What's this sediment in my pump discharge line?
 

sorry to hijack a month old thread but thought I would chime in to see if you got the machine descaled and running? The sediment in the tube looks like poor water quality, like we have here in Az however, ime even using and RO system and softener I still see sediment. Anyway, my first post here hope it helps :)
The discharge tube you pointed out in the pic is coming from the expansion valve which regulates the circuit when the pump is not running. During initial start up, the cold water in the circuit will expand and if enough, the  valve will open and drip, usually 11-12 bar. The bypass in the pump handles system pressure when activated, the key there is to make sure the expansion valve is adjusted (if adjustable) higher then the pump otherwise you will dump pressure out the expansion. Seeing that your tube had a questionable about of scale/deposits I would be looking to make sure the valve isn't faulty and letting water dump all the time.
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