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Author Topic: Sorel controller/ pump speed control question  (Read 445 times)
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« on: November 06, 2018, 03:11:36 PM »

Apologies if this has been asked before or if it's obvious elsewhere, I've looked and not found the answer.

I am about to install my second system, the first was a 30*47 with 180l open vented cylinder, is 11+ years old now and on a Resol DeltaSol B/S4, working as well now as ever.

The new system is a 30*58mm with 250l mains pressure cylinder and heat dump to CH thermal store.  I am about to sort out the controls and pumps; looking at the Sorel MTDC to do control duty here but don't follow the options for pump speed control.  The Sorel has R1 and R2 outputs for the two pumps (in my case) but one variable speed output too.  To employ variable speed for the collector pump do you use the variable speed output and ignore R1 output?

I am happy to use a fixed speed for the dump circuit to the thermal store.

I have two NOS pumps to play with, both unused and handily laying about; an older Wilo 3 speed and a more recent Screwfix/ Flomasta low energy/ variable job.

Can I use the Flomasta in fixed (not variable head I assume) setting with the speed control set to PWM?  I assume the 0-10v output is for a clever pump with an analogue input for speed control.

Any help would be appreciated to assist with controller and pump choices.
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