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Install the Spirax-Sarco 69844 13WS 1" NPT Air Eliminator to solve persistent air binding issues in your pressurized liquid systems
Common Questions: How do I reset the control after a trip
and combustion air proving
The 755-50 is typically used as the upper control in a two-element system or as the primary control in a single-element series circuit where a full power disconnect is required
York S1-031-09179-000 Board Els PW 17895 Install the Spirax-Sarco 69844 13WSThe 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