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Taco SR501, SR504 and DPDT Relay
Utilizing Circulators
Taco SR504 and two DPDT Relays
Utilizing Circulators
Same As Above
I like to use RIB relays which stands for Relay -In-A-Box. The drawings below show both SPST, SPDT and DPDT relays. The normally closed relay wire would just be capped off on the drawings showing SPST relays. The part number for the RIB relay is RIBU1S or the SPDT relay (cheaper one) is RIBU1C
You could also use the honeywell R4225A1008. Both relays are 120v coil relays.
Taco SR-503 when boiler and indirect circulators are required to run at the same time
Taco SR504-EXP and a SPST Relay
Controlling Boiler and Optional System Circulators
End switch gets wired to the thermostat connections on the boiler
Boiler pump must run when the indirect calls
This would be used with or without system circulators and Pump(S) must run on a call for heat or DHW.
The relays are good for 5 amps.
Taco ZVC-406 and Zone Valves and SPST Relay
Controlling Boiler and System Pumps
System pump shuts down and the Indirect pump is controlled by the boiler
Taco ZVC-403
Two system zone valves and a pump on the indirect
System pump shuts down on a call for hot water
Taco ZVC406, Zone Valves
Both System Pump and Boiler Pump Run On Any Call
Indirect Pump Controlled by boiler
Taco ZVC-406, Zone Valves, SPST Relay
Controlling System, Boiler and DHW Pumps
System pump stops on call for DHW
Indirect Pump "Not" Wired to Boiler
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