Lennox 94W59 Phase Loss & Reversal Protection Board

The Lennox 94W59 is a critical protective control board designed to safeguard commercial and residential HVAC equipment from potentially damaging three-phase power issues. This component continuously monitors incoming three-phase electrical power for phase loss, phase reversal, and voltage unbalance conditions that can cause compressor and motor damage.

Key Features:

• Universal three-phase voltage input: 180-600 VAC, 50/60 Hz operation
• Control voltage range: 18-32 VAC for compatibility with standard HVAC systems
• Bright LED indicators display operational status and fault conditions
• Automatic load de-energization upon detecting phase problems
• Epoxy-encapsulated construction provides moisture and environmental protection
• SPDT relay output rated at 6 amps at 32 VAC maximum
• Compact dimensions (approximately 3.25" L x 3" W x 1" H) for easy installation

When the board detects proper voltage conditions on all three phases, it energizes the load and illuminates a green indicator LED. If phase loss, phase reversal, or significant voltage unbalance is detected, the red fault LED illuminates and the load is immediately de-energized to prevent equipment damage. The board automatically resets once normal power conditions are restored, eliminating the need for manual intervention. This protection is essential for scroll compressors, screw compressors, and three-phase motors used in rooftop units, package units, and split systems.