Direct OEM Compatibility: Identical to the Lennox 10K5401

providing stable torque and speed adjustment across the entire frequency range

while physical mounting may be similar to universal parts

The MARS 19005 Potential Relay is a heavy-duty 395V 66 potential relay engineered for precise single-phase motor starting in high-demand refrigeration and air conditioning systems

and 277V circuits without internal reconfiguration

Lennox 54M89 Control Kit 30067439-890 Direct OEM Compatibility: Identical toThe Lennox 54M89 Low Ambient Control Kit (LB 101123B) is a critical field installed accessory designed to maintain head pressure in PSC fan heat pump units during cooling cycles in low temperature environments. This kit enables reliable system operation down to 30F ( 1C) by cycling the outdoor fan via the S11 pressure switch. By regulating fan operation, the kit preserves the necessary pressure differential across the expansion device, preventing