Laars Heating Systems R0021300 Transformer 320788-703 or if there is visible

or if there is visible bending or breakage of the internal plates

Integrating this assembly during a HVAC system repair ensures the unit operates within the manufacturer’s design parameters for drainage and venting safety

The base ZONEBB3ZHP01 supports three zones

While cleaning the rod with a non-conductive abrasive (like a Scotch-Brite pad) can temporarily restore the signal

This technician-specified setting means the internal contacts complete the circuit when the sensed pressure drops to the calibrated set point (fall)

Laars Heating Systems R0021300 Transformer 320788-703 or if there is visibleThe Laars R0021300 Transformer is a critical electrical component designed for precision voltage step down in hydronic heating systems. This 40VA control transformer features a 120V primary to 24V secondary configuration, providing reliable power to integrated boiler control boards, gas valves, and safety circuits. Engineered specifically for Laars heating systems, this component ensures consistent secondary voltage stability, preventing localized