The "H" suffix typically denotes the "Husky" branding used in specific distribution channels

Measuring approximately 21-1/4 inches by 4-3/4 inches

Is this compatible with 240V systems

Interconnect Capability: Supports communication for up to 50 detectors

Rheem-Ruud 47-21517-82 Control Board Kit 30067439-890 The "H" suffix typically denotesThe Rheem Ruud 47 21517 82 Defrost Control Board Kit is a direct OEM replacement engineered to manage the complex demand defrost logic in high efficiency heat pump systems. This microprocessor based controller monitors ambient and coil temperature sensors to execute precise defrost cycles, preventing excessive ice accumulation on the outdoor coil that can compromise compressor longevity and system COP. Designed for compatibility with various Rheem 47