Aquastsr in Heating loops [RE-wrenches]

Drake Chamberlin - Electrical Energy solar at eagle-access.net
Thu May 24 09:53:14 PDT 2001


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We are working with a system where the Aquastar shuts off.  The loop 
between the heater and tank is circulated by a March pump.  Is that the 
problem?

Drake

At 09:49 AM 05/24/2001 -0700, you wrote:
>The Aquastar requires a tank because the low flow of  low voltage pumps is
>too low to trigger the flow sensor in the aquastar. I have done about 16 or
>17 of these and the NEW Bosch-Aquastar heaters are not modifieable like the
>old units. You used to be able to do aseries of easy unit modifications to
>assit the low flow to an even lower flow. The tank acts as a buffer to
>prevent the over haeting that will result from a flame modulation unit that
>is not sensitive enough to handle the evential rise in temerature that will
>result when the loop gets warmed up and the return temp is 165 to 170 if you
>are running 180 deg to the base boards.
>Use the tank and donot use an El Sid pump to the heater. Use 10 watt Hartell
>pump it gives good head for the heater. Use ElSid pumps for the base board
>pumps, they are much quieter.
>
>
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