Throttling back on primary pump speed to temper return water

Throttling back on primary pump speed to temper return water

PostBy: kstills On: Sat Nov 09, 2013 7:39 pm

My primary pump is running about 19gpm. Both secondary zone pumps are set for about 7 gpm.

If I cut my primary loop output down to, say, 2gpm, that would cause the zones to recirculate some of the return water, and less of the return water would end up going to the boiler, correct?


Or am I missing something?
kstills
 
Stoker Coal Boiler: WL 110
Stove/Furnace Make: Leisure Line

Re: Throttling back on primary pump speed to temper return water

PostBy: Rob R. On: Sat Nov 09, 2013 7:48 pm

Yes...assuming the system is piped the way I am imagining. Throttling the flow in the primary loop should not impact flow in the secondary loops...if it does, well...you don't have primary/secondary piping. :)

Do you have a ball valve on the output side of that circulator that you can adjust? You do not want to restrict the pump on the suction side.
Rob R.
 
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: Lehigh Rice
Other Heating: Dad's 1953 EFM Highboy

Re: Throttling back on primary pump speed to temper return water

PostBy: kstills On: Sat Nov 09, 2013 7:52 pm

Rob R. wrote:Yes...assuming the system is piped the way I am imagining. Throttling the flow in the primary loop should not impact flow in the secondary loops...if it does, well...you don't have primary/secondary piping. :)

Do you have a ball valve on the output side of that circulator that you can adjust? You do not want to restrict the pump on the suction side.


Why, yes I do!

I have valves on top of valves in that system..... :lol:

This could change everything. :)
kstills
 
Stoker Coal Boiler: WL 110
Stove/Furnace Make: Leisure Line