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We show up today to fix a broken aquastat as the domestic indirect was putting out almost 200°F. Thermostat on the TT - Phase III was gone too.
Here's the problem.
Boiler is on a triple acting aquastat and the TT are jumped out. It appears the heater always runs on one big loop and each unit has its own zone valve. We get there and the maintenance just had the system pump disconnected. In my diagram you'll see 2 wires go from the "ice-cube" relay to the aquastat. When I switch everything over I can get the indirect to fire just perfect. I have no idea what the point of the ice cube relay is here. How can those wires be connected in a way that something is achieved. Either I'm missing something or the last person put in something that had no purpose so disconnecting the 2 wires was his solution. These icecubes always make my head spin in circles when troubleshooting.
Thanks in advance.