Charging pumps [RE-wrenches]

[Conrad Geyser]

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Brian,
    We use a gear pump with a bypass valve for regulation.  Dunno what's up
with your pump, is the intake line collapsing and causing a stoppage?
    But we don't just pump the antifreeze in.  We flush the system (with the
pump in line) throroughly with fresh water and then folow this with the
antifreeze.  If possible, I prefer to actually let the system heat up before
the final flush.  This gets the flux in the pipes moving with the water and
mostly out of the system when you flush.  I don't like the thought of it
kicking around in the loop reacting with the antifreeze & all.
cheers,
Conrad Geyser
Cotuit Solar

----- Original Message ----- 
From: "Brian Vick" <brian at whidbeysunwind.com>
To: <RE-wrenches at topica.com>
Sent: Monday, October 17, 2005 6:46 PM
Subject: Re: Charging pumps [RE-wrenches]


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> Wrenches,
>
> What pumps or other techniques are you using for the initial system fill
for
> closed loop solar hot water? We are currently using a Teel 1/2 hp
> centrifugal utility pump and we have to turn it on and off repeatedly
> because the flow drops off after a few seconds even when there is no
> pressure in the loop. It takes a long time to get the air out of a system
> this way. Not to mention it's frustrating. Would a positive displacement
> pump solve this?
>
> Thank you,
>
> BRIAN VICK
> Whidbey Sun & Wind
> Renewable Energy Systems
> 360-678-7131
> brian at whidbeysunwind.com
> 987 Wanamaker Rd
> Coupeville, WA. 98239
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