[RE-wrenches] flushing DHW collectors

[Glenn Burt]

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

www.vermontsolarnow.com

dba Vermont Solar Engineering

NABCEPTM Inaugural Certificant

VT RE Incentive Program Partner

802.863.1202

 

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