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PC605 Priority Protection Plug-In Card

The solid-state Taco Priority Protection Plug-In Card helps prevent freeze-ups in the event of a priority zone failure. If the priority zone calls for heat continuously for more than one hour, power is returned to the space heating zones, allowing all the zones to function independently. Once the priority zone is satisfied, the control's auto-reset is activated and the priority zone is again allowed to have priority for up to one hour.