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Weil McClain GV-5 Series 1 w DHW wiring
I have a wiring arrangement on my WM GV-5 series 1 boiler with a WM Combo 30 DHW tank I would like to upgrade. I am considering a Taco SR 506 Switching Relay. I currently have 4 zones which are controlled by 4 separate thermostats 4 Taco circulators and 4 Honeywell zone valves. The boiler has a circulator which comes on whenever a zone is calling for heat in concurrence with the heat zone circulator. The boiler maintains a temp. of 130 deg with a high limit of 180.
When the DHW aquastat calls for heat the boiler mounted circulator runs and a three way valve opens allowing boiler water to flow to the Combo 30 but shuts off flow to the line feeding the zones. There is a relay mounted next to the transformer for the boiler control voltage and this relay starts the circulator when the control voltage going through the aquastat calls. I've posted photos below and would appreciate some direction on rewiring the system controls. I understand the thermostat and pump wiring but am not clear on the aquastat boiler circulating pump wiring. I basically want a priority for the DHW so the zone pumps don't run when the DHW demand is shutting off the 3 way valve to the heat zones. The concern I have is the transformer mounted on the boiler and the transformer attached to the SR 506 conflicting.