Here's a drawing showing what I'm thinking of. It's simplistic, I know, but I'm new to this. I will be batch burning.
Scenario 1) Wood Boiler Running:
CIRC 1 activates when the boiler reaches a specified temperature (Let's say 150F). With ZV-6 closed, the water will circulate through the Loading Valve untill 160 is reached, and then it will begin to allow water to flow through the "cold" side of the valve, which will force water through the storage tank heating this up. This will back-flow through CIRC-3. Will this be a problem?
1B) If a zone calls for heat during this time, ZV-6 and the appropriate zone valve (1 - 5) will open. This will allow the water from the boiler to flow through the house. Water will be prevented from flowing back through the Oil Boiler with Check Valve 3.
Scenario 2) Wood Boiler off/Storage within temp range:
CIRC 2 activates, ZV-6 opens, and the appropriate ZV (1 - 5) opens. Water is circulated through the heat stoage to heat the zone. Check Valve 3 prevents flow back into the oil boiler, while the Loading Valve & Check Valve 2 prevent backflow to the wood boiler.
Scenario 3) Oil Boiler running/Wood Boiler Off/ Storage below temp
This would be backup mode. CIRC-2 would turn on with the boiler. ZV-6 would prevent the oil boiler from heating the storage. All zone valves would open as the oil boiler has 1 thermostat. Check Valve 2 would prevent a backflow through the storage while the loading valve and Check Valve 1 would prevent a flow through the wood gun. This way the oil is only heating the household zones.
Please let me know what you think, and if this will match up to what I'm thinking. I'm trying to KISS for the first year, and can always go back and refine next year when the project budget recovers.