I am looking for a simple way to control my oil boiler to keep it from coming on when my PB 105 Boiler is active. I have a simple series set up with 3 circulators one for each zone and a Honeywell triple aqua-stat on the oil boiler. I have disabled DHW coil (not using) and disconnected blue wire in aqua stat to run as cold start. Currently I have temp set very low on aqua stat so that it won't come on until boiler temp drops below 120. PB 105 has 180 for high temp and 150 for low. I would like to raise the temp on aqua-stat on oil boiler so that if pellet boiler doesn't run oil boiler would be more efficient. Looking at possibly running NC relay powered by combustion blower to interrupt power to oil burner?