I am looking to upgrade 3 Honeywell RA832a relays that control the hydronic circulator pumps on my boiler.
Pic 1.= Honeywell relays
The problem with the current setup is the need for a common wire to power my smart thermostats. The current setup is power robbing from one another and so I purchased a Taco SR504-EXP-4 which has a three wire setup for a common wire.
I have a Burnham Low pressure Gas Boiler with a honeywell L8141e aqua stat that calls for the temp to always be 200 degrees.
The current setup has 2 thermostats(zones) with an indirect domestic hot water heater with aqua stat for a total of 3 zones.
I am also confused about this 24v relay that is wired with 24v wiring from the 3 Honeywell RA832a and also the hot water heater aqua stat and then into the "TT" inside boiler aqua stat.
My guess is this relay sets priority to DHW circulator.
Pic 2= 24v wiring relay from the 3 Ra832a's
Does the Taco Board replace this relay?
The boiler has L1 and L2 wires that are currently run to one of the Honeywell relays
and the "TT" is wired from the 24v relay.
How are L1 and L2 wired if the 120 volts is being used by the new taco switch?
What output on SR504 provides the aqua stat with 120v?
I do not see Zc and Zr on this aqua stat. (Honeywell L8184)
The Taco board does not discuss anything regarding L1 an L2 also...
Pic 3= Taco SR504 Board
Pic 4= Honeywell Aqua stat
Can anyone help?