I am upgrading my heating system in steps and need some advice on how to proceed.
Last year I installed a Weil-Mclain GV90+2 that heats two zones (upstairs/down stairs). The system has two Honeywell R845A1030 Switching Relays that provide power to twoTaco 007-F5 circulators. There are 2 wire connections between each thermostats and the R845A's, which are connected to the 'T' terminals and the 'W' and 'R' terminals on the battery powered thermostats. Terminal '5' and '6' of the R845A's are hooked together and then one has a wire to the GV90, attached to the 'BK' and 'BK' wires of the TSTAT plug.
I have bought two Ecobee 4 thermostats and am planing to pull new 5 conduit wire from the boiler to each thermostat location.
First question is can I use the 'C' wire from the TSTAT plug on the boiler as the 'C' wire for both Ecobee's keeping the 'W' and 'R' wires as they are currently wired?
Second question is that I want to replace the R845A's with a unit that has solid state relays. Would a Taco SR502-4 work out of the box to replace both with a single unit? Providing I have the 5 wire conduit run.
Thank you for any and all advice
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