Hello-
I am in need of some wiring advice. My heating system is a hybrid system - gas fired boiler. I have 5 zones of under-floor radiant heat (PEX), and 2 zones of conventional hot water baseboard. The baseboard zone valves are 24V Taco 571 valves, three wire, and the under-floor radiant are 4 wire (with end switch) 24V valves. There are two circulator pumps, one for the baseboard and another for the under-floor radiant. There are also two pump control relay boxes, one for each system. The boiler control is a Honeywell Aquastat Relay L8148E.
My problem is that when the under-floor radiant zone calls for heat, it's own pump kicks on as it should, but I also need to tell the boiler to turn it's circulator pump on and fire to heat the water. As of now, I have the end switches from the under-floor radiant wired to the "thermostat" terminals on the boiler relay control box. This works fine and operates the boiler when a under-floor zone calls for heat. The problem is that when a baseboard zone calls for heat, it now also turns the circulator on for the under-floor radiant, whether it calls for heat or not.
Do I need some kind of additional relay or do I have the wiring wrong?
Any help would be appreciated.
Thanks,
Matt
NJ
I am in need of some wiring advice. My heating system is a hybrid system - gas fired boiler. I have 5 zones of under-floor radiant heat (PEX), and 2 zones of conventional hot water baseboard. The baseboard zone valves are 24V Taco 571 valves, three wire, and the under-floor radiant are 4 wire (with end switch) 24V valves. There are two circulator pumps, one for the baseboard and another for the under-floor radiant. There are also two pump control relay boxes, one for each system. The boiler control is a Honeywell Aquastat Relay L8148E.
My problem is that when the under-floor radiant zone calls for heat, it's own pump kicks on as it should, but I also need to tell the boiler to turn it's circulator pump on and fire to heat the water. As of now, I have the end switches from the under-floor radiant wired to the "thermostat" terminals on the boiler relay control box. This works fine and operates the boiler when a under-floor zone calls for heat. The problem is that when a baseboard zone calls for heat, it now also turns the circulator on for the under-floor radiant, whether it calls for heat or not.
Do I need some kind of additional relay or do I have the wiring wrong?
Any help would be appreciated.
Thanks,
Matt
NJ