Lennox 99M66 Heater Kit 320734-701 suitable for high-pressure HFC and

suitable for high-pressure HFC and HFO refrigerants

Broad Compatibility: Direct replacement for the Johnson Controls F61KD-4 legacy series

it includes a foot-mount chassis and 1/4-inch quick connect terminals for rapid field replacement

Engineered as a direct replacement for various York S1-031-09174-000 legacy units

Universal aftermarket covers often lack the precise dimensions needed to maintain the correct drafting pressure required by the burner assembly

Lennox 99M66 Heater Kit 320734-701 suitable for high-pressure HFC andThe Lennox 99M66 (Model: ECB26 7CB PP) is a field installable 7. 5kW electric heater kit designed for high performance integration with CBX26UH series air handlers. Operating on a 208 240V single phase 60Hz power supply, this kit provides a nominal heat output of 25,600 BTUH at 240V, making it an essential component for supplemental or primary heating in residential and light commercial forced air systems. The assembly features an integrated circuit