Looking for a wiring diagram for a new dunkirk boiler . Just the diagram for the 3 zone valves. Company says that the boiler transformer is enough to run three zones ( 24v) . Or do I need to add transformer. Just can't figure out the wiring from one zone valve to another. Contacts on each zone are th/tr - th - tr - and two end switch terminals. Any help out there sure would be appreciated. Thanks