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Secondary return pump
Posted: Mon Mar 06, 2023 10:59 am
by crosshands@hotmail.com
Good morning.
My customer is wondering if they can control their secondary return pump via their evo home?
They have bdr91’s to control 2 port zone valves for hw and ch. I’ve tried tech support but think I confused the guy! Mind you, I may have confused myself too!
Re: Secondary return pump
Posted: Thu Apr 20, 2023 12:40 pm
by Richard
No not possible.
Re: Secondary return pump
Posted: Wed Aug 02, 2023 9:48 am
by grog_b
wouldn't it work with BDR91 set for certain times,
secondary return is just to circulate hw in the pipes to allow hw almost instantly ?
unless i missed something?
Re: Secondary return pump
Posted: Wed Aug 02, 2023 10:11 am
by Richard
How would you bind a BDR91 in and if you could, how would you prevent it overriding the control logic of the evohome controller?
Re: Secondary return pump
Posted: Thu Oct 26, 2023 11:05 am
by grog_b
could you bind it as a heating zone, and just set it to the times you want it to operate?
Re: Secondary return pump
Posted: Mon Nov 06, 2023 12:59 pm
by Richard
No, because it will override the heating demands of all the other zones being controlled, especially bad if using OpenTherm.