I am new to this site and don't know anything about HVAC electrical switching relay with priority for a gas furnace. My question is; If a switching relay with 3 zones is installed on a gas boiler what exactly does it do? For example If you give it priority to heat zones 2 and 3 does it bypass zone 1 completely and render the thermostat control in zone 1 inoperative?

>>>>>>Copied to HVAC<<<<<<