AZC 40P is a 4 zone control board with Zone #1 being priority, designed for use with 2-wire thermostats

• Both 40P and 60P are designed with filtered, slow closing circuitry that eliminates humming and water hammering from rapid closure

• When switched on, once indirect water heater aquastat is fulfilled, system returns to normal heating zone automatically

• 50 VA MB Power supplies also available for use with 3 wire thermostats