Charging pumps [RE-wrenches]

[Kurt Nelson]

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Hey Brian and all,

I've been following this a bit and was wondering if the suction hose
could be a part of the problem?  If not designed for suction, it might
be that it is collapsing and greatly reducing delivery.  

Another e-post recommended the Surflow (Spelling?) pump and I have also
used those as a charging pump.  In caution I would mention that
particular attention must be paid to having a rise in the entire piping
with air bleed valves at any high point(s), as it is a low flow pump and
will not move a lot of air.  This is especially problematic with in-slab
heating systems.

Kurt
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Kurt Nelson
PO Box 309
Cornucopia, WI 54827
715-742-3406
sunwise at cheqnet.net


-----Original Message-----
From: Brian Vick [mailto:brian at whidbeysunwind.com] 
Sent: Monday, October 17, 2005 5:46 PM
To: RE-wrenches at topica.com
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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