Lennox 59K21 Control Board Refrigerant this valve’s compact footprint and

this valve’s compact footprint and high-flow orifice deliver the performance precision required in the field

This is an SPST (Single Pole Single Throw) switch with a Normally Open (NO) contact function that closes on rising pressure

this plenum rated thermostat cable carries a CL2P safety rating

The housing is constructed from rugged plated steel

Lennox 59K21 Control Board Refrigerant this valve’s compact footprint andThe Lennox 59K21 Control Board is a fundamental integrated ignition control module designed for high performance residential gas furnaces. As a high reliability "brain" for your heating system, this board manages the critical sequence of operations, including the furnace ignition control, inducer motor timing, and blower transitions. Technical data confirms that the 59K21 is identical to 59K2101, providing a direct OEM HVAC replacement part for