I understand the principle behind the 120v overtemp protection relay. However, I need to find out how to tie it into my existing system without adding zone valves/circulators.
My current heating system uses 24v zone valves. Thermostat calls for heat, opens the zone valve and powers the circulator through an 8148 Aquastat Controller.
Without adding a dedicated 120v zone valve for the overtemp relay, I would like to install a 24v step down transformer and tie the feed into an existing zone valve. In retrospect, making the wood boiler act as a thermostat. However, won't the feed from the existing thermostat back-feed through the newly added 120v/24v overtemp relay when the thermostat calls for heat, and vice-versa? Econoburn mentions that the overtemp relay is a rare occurance. And the chances are that both call at the same time is even more so.
I've gotten several mentions of a rib relay but I'm unfamiliar with these and specifically which one would suite my application. Any suggestions?
My current heating system uses 24v zone valves. Thermostat calls for heat, opens the zone valve and powers the circulator through an 8148 Aquastat Controller.
Without adding a dedicated 120v zone valve for the overtemp relay, I would like to install a 24v step down transformer and tie the feed into an existing zone valve. In retrospect, making the wood boiler act as a thermostat. However, won't the feed from the existing thermostat back-feed through the newly added 120v/24v overtemp relay when the thermostat calls for heat, and vice-versa? Econoburn mentions that the overtemp relay is a rare occurance. And the chances are that both call at the same time is even more so.
I've gotten several mentions of a rib relay but I'm unfamiliar with these and specifically which one would suite my application. Any suggestions?
![[Hearth.com] Econoburn Overheat Relay - Tieing 120v to existing 24v system](/talk/data/attachments/87/87701-df5036b9b9f71b1aee700d67af789a37.jpg?hash=JVZ3XkhCj0)
