Hello everyone, first timer here with a question on my Utica boiler and a new radiant heat install with a second circulator. I have a 5 year old Utica SVB-4 boiler with an Argo AZ-5 zone controller, 4 baseboard zones in use with one circulator. As I understand (and the way the boiler currently functions) when the thermostat calls for heat on any of the 4 zones the circular starts and then the boiler fires. I would like to install a second loop with a second circulator for radiant heat. Assuming I use a Taco SR501 to control the second circulator how do I run the XX wires from the SR501 back to the boiler? If I tie them into the existing TT wires on the boiler this will start the first circulator, I just want to enable the boiler to fire and let the second circulator take care of the radiant heat. Is there a spot on the Honeywell control board model S9361A2070 where I can attach the XX output of the SR501to give a permissive for the boiler to start without starting the first circulator or will the boiler start based on lowering temp in the boiler once the radiant heat circulator starts(pretty sure I need a permissive to let the boiler start)? Still looking into it and I could use the 5th zone on the AZ controller but I’ve heard radiant works better with its own circulator. Thanks for any help you can provide.
Mike
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