[RE-wrenches] flushing DHW collectors

[Christopher Warfel]

We have had luck using a 25% solution of white vinegar, pumping the 
solution into the system until the pump cannot overcome the friction, 
capping the inlet(where the pump was pumping), make sure the outlet is 
open, let the sun superheat the solution and blow the obstruction out 
through the outlet.  (Just have to make sure that no one, nothing is in 
the way of the outlet)
Chris
On 4/17/2015 2:05 PM, Glenn Burt wrote:
>
> When I was installing them and using Tom Lane’s book, he recommended a 
> solution of TSP be used for cleaning lines prior to charging with HTF. 
> 1 cup per gallon of water is what I read. He suggests running it for 
> 30 min, then flushing with clean water for another 30 before charging 
> with HTF.
>
> -Glenn
>
> *From:*RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] 
> *On Behalf Of *Kirk Herander
> *Sent:* Friday, April 17, 2015 1:21 PM
> *To:* RE-wrenches
> *Subject:* [RE-wrenches] flushing DHW collectors
>
> Hello,
>
> I have an older 10 collector system in which the glycol has stagnated 
> due to a defective collector sensor, apparently for some time. I was 
> able to drain the collectors, the cooked glycol is black with a good 
> bit of sediment. I tried to flush the system with water but my ½ hp 
> utility pump could not pump the water entirely through the collectors. 
> Suction slowed down and stopped after just a few gallons, as if the 
> pump couldn’t overcome the effective head of the system. I had no 
> problem using this pump to charge the loop when it was commissioned. I 
> suspect the collectors may be gummed up with cooked glycol. I guess 
> compressed air is next to try. Are there any safe chemicals to use to 
> purge / un-gum the collectors? Thanks.
>
> *Kirk Herander*
>
> *VT Solar, LLC *
>
> */Proven PV provider since 1991/*
>
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>
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>
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-- 
Christopher Warfel, President
ENTECH Engineering, Inc.
PO Box 871, Block Island, RI 02807
401-466-8978

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