The wiring on the storage side became a little tricky when I decided to use a switch/outlet combo to allow both the transformer to be switched on and off and the Taco Relay to energize an outlet, since the pump has a cord and plug instead of direct wiring. This diagram does not show all the grounds but they are all connected like the white wires.
Leviton 109-05225-WSP Combo Switch and Receptacle, White
I also needed the power to go through this box on to the Taco Zone Valve so the wiring also required a pass through the box. For that I used this diagram. I use these circuit diagrams frequently as they cover most all wiring configurations. I have 31 of these from an ibook version of the Black and Decker wiring handbook. I’m glad I saved them to my computer.
This is the wiring example for extending full power to the last receptacle, except I’m extending it to the Taco Zone Valve Controller.
I was able to wire this equipment and complete the wiring so that the transformer and aquastat won’t use energy unless turned on and the Taco Pump Relay will control the pump that circulates water from the storage tank through the heat exchanger.
If the logic I’m using is correct, I will also move the gas boiler TT which is the trigger to activate the boiler from the zone valves to this relay and the primary pump wiring would be moved to the normally closed position on this relay. Since I don’t want the heating system to be down in case I have an error in my thinking, I will wait until March to hook the entire system up. Another few months wait in a project like this is inconsequential. I can cross “set up boiler” off the list and add connect boiler to the spring list.