Lennox 94W59 Phase Loss & Reversal Board

The Lennox Building 94W59 Phase Loss & Reversal Board is an indispensable safety device intended for certain types of Lennox HVAC equipment, presumably furnaces applying a three-phase power supply. This small Device is an electrical watchdog that protects your furnace from electrical problems that may harm it. The board constantly scans the incoming electrical supply for any deviation in the three-phase supply normally used in commercial establishments. When there is an imbalance of voltage or total absence of voltage in phases, the 94W59 turns off the furnace to protect electrical parts.