While designed for Heil and Quaker

Environmental Safety: Non-PCB oil-filled design meets modern environmental standards while providing internal protection against pressure-related ruptures

performing reliably across ambient temperatures from -40° to 205°F

the HK02ZZ001 offers a direct-fit solution that eliminates compatibility issues common with universal parts

Lennox 15D55 Control Board 322838-752 While designed for Heil andThe Lennox 15D55 Defrost Control Board is a critical OEM replacement component engineered to manage the complex defrost cycles of Lennox heat pump systems. As a veteran technician knows, maintaining the integrity of the outdoor coil is paramount; this board utilizes advanced demand defrost logic to monitor coil and ambient sensors, preventing efficiency robbing frost buildup. With high temp ratings up to 105C and a robust 47F capacitance, the Lennox