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Taco sr503 relay question
Leon82
Member Posts: 684
I'm only using zone 1 and 2 and the tt contact goes to the first tt input on the boiler.
I want to move the 2nd zone to the priority zone 3 and use the priority tt to the second tt input on the boiler to run a separate odr/temp curve. But I want the priority function inactive
I read the directions a few times and am a little confused. Do both end switch close when the priority zone calls for heat? If so it is going to kill my plan
Thanks
I want to move the 2nd zone to the priority zone 3 and use the priority tt to the second tt input on the boiler to run a separate odr/temp curve. But I want the priority function inactive
I read the directions a few times and am a little confused. Do both end switch close when the priority zone calls for heat? If so it is going to kill my plan
Thanks
0
Comments
-
It sounds like you have a SR503-EXP? Am i correct?
The -EXP controllers have two separate end switches (XX). The "Main End Switch" only closes upon a heat call from any heating zone, in your case Zone 1 and Zone 2.
The "Priority End Switch" only closes when Zone 3, the priority zone, is calling for heat as long as the priority switch is on.
Dave H.
Dave H-1 -
Yes , exp.
Thanks0 -
It looks like it won't work like I had hoped.
I'm getting 7 volts across rw on a the zones NOT calling for heat. Is this normal?
It is a battery thermostat with only 2 wires0 -
-
Ok, thanks. The one that's closed is at zero currently0
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