Standardized Heavy-Duty Ports: 3/4" NPT threading allows for straightforward installation into existing gas manifolds

The integrated warmer/cooler setpoint adjustment allows for local occupant comfort overrides

it requires a minimum pressure differential of 5 PSI to move the internal diaphragm and open the flow path

The heavy-duty SPDT contacts are rated for 21A resistive at 240 VAC

When you're on a job and need to ensure system integrity

Lochinvar & A.O. Smith 100278134 Control 320788-702 Standardized Heavy-Duty Ports: 3/4" NPTThe Lochinvar & A. O. Smith 100278134 Control is a critical OEM User Interface Control board engineered for precise system management in high efficiency condensing boilers. As a direct replacement for legacy part numbers RLY20136K, RLY20136, and 100189277, this Boiler Control Board provides the necessary digital interface for real time monitoring and adjustment of combustion parameters. This HVAC Replacement Part is a standard component in the