As a delayed-opening gas valve

This 330C Over-Temp Limit switch (often referred to as the heat exchanger high limit) acts as a primary fail-safe by monitoring thermal conditions at the heat exchanger

typically requiring a 24 VDC source

Designed to withstand the rigors of commercial environments

It serves as the authoritative replacement for part number HC37XE278A

Utica-Dunkirk FE3980C070 Pressure Switch 323055-751 As a delayed-opening gas valveThe Utica Dunkirk FE3980C070 Pressure Switch is an essential OEM safety component designed for high performance hydronic systems, including the CCB150 and CHB series boilers. As a veteran grade boiler water pressure switch, this part is engineered to monitor system pressure and prevent the burner from firing under unsafe low water or low pressure conditions. Built with ECR International sensors and featuring a 1 2" NPT connection, it ensures a secure,