Trying to wire up these boilers makes my head want to explode and since the I know someone must have the knowledge on how to do this best, here goes. First, I have a Thermodynamics oil boiler (wired for domestic coil) in the house with fours zones. Its running a Honeywell L8124C aquastat and an Argo AR861 three zone control box that was installed by previous owners. Three zones are wired into the controller and one is wired into the aquastat. I have just put in an EFM 700 in a pole building that I am in the process of wiring up. Its controls are a Honeywell L7224U aquastat (wired for domestic coil) and a Taco 4 Zone control relay. There are three zones for the pole building and one ciculator connecting the EFM and the oil boiler in series all in the relay box.
My problem is: I have already laid in the thermopex line connecting the boilers along with a conduit containing a thermostat wire. The circulator connecting the two boilers is in the pole building, which is 200 ft away from the house. My plan was to use the thermostat wire in the conduit to control the circulator connecting the two boilers so that when there is a call for heat in the house the circulator starts rather than continuously running. Maybe I'm being dense, but I can't figure out a way to get a 24V signal from my controls in the house into that thermostat wire running to the pole building. Do I need to rewire the oil boiler somehow....buy some fancy control....quit being stupid...what? Wiring experts - have at it! Thank you.