Hi, folks. I have a 3-zone forced hot water heating system in my house. One of the relays, a Honeywell R845A, recently died. I replaced it with a TACO SR501 switching relay. The new relay is working fine with the following exception: when there is a call for heat the furnace should always startup but it doesn't. The furnace doesn't automatically startup because I have not yet attached that particular wire responsible for starting the furnace. The problem is I don't know where to put that wire and I don't understand how that particular function works. The original #4 terminals on the R845A's were daisy chained and led back to the furnace relay, a Honeywell L8124A. I think that connection was responsible for turning on the furnace when the relay called for heat. When I replaced one of the R845A's with the TACO, I couldn't figure out what terminal on the TACO triggers the furnace to automatically start. I'm currently using the #4 terminal on the TACO to drive the circulator pump for that particular zone. Everything seems to work fine: when the thermostat calls for heat the circulator pump turns on but the furnace does not automatically start. The remaining unused switch terminals on the SR501 are the normally open or close switch terminals #6(N/O) or #6(N/C). The common terminal for node 6 is #5. Can someone clear things up with respect to what the L8124A needs to see in order to start the furnace. Any information would be appreciated. Thanks. Al
PS - Technical Assistance at TACO was terrible so I don't plan to contact them again. Honeywell TA was nonexistant.
PS - Technical Assistance at TACO was terrible so I don't plan to contact them again. Honeywell TA was nonexistant.