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While this specific model is optimized for 24 VAC excitation
As a critical OEM replacement component
maintaining efficient startup and continuous performance in Trane and American Standard HVAC equipment
This is a thermally actuated relay
optimized for thermal protection and corrosion resistance in condensing and non-condensing heating environments
York S1-031-09179-000 Board 30067439-890 While this specific model isThe York S1 031 09179 000 24V Relay Lock In Board is a critical control component designed for precise sequence management in commercial and residential HVAC systems. This genuine OEM part serves as the direct replacement for S1 031 09155 000, addressing common communication failures and relay chatter issues found in older board revisions. Operating on a standard 24V AC control circuit, this board functions as a lockout relay, preventing short cycling