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the EL1220 is designed to operate in both steam and hydronic heating systems
this switch is the primary defense against heat exchanger damage and hazardous overheating
It is designed legacy systems requiring a double-pole transformer with a mid-point ground and specific physical dimensions for Armstrong or ESSO hardware
providing long-term stability for commercial airflow proving
Williams 7131 Gas Valve Els PW 29614 the EL1220 is designed toThe Williams 7131 is a high performance 4" WC Natural Gas Valve engineered for precise manifold pressure regulation in Williams wall furnaces and floor heaters. This 1 2" NPT gas valve serves as the direct OEM replacement for legacy part numbers P295300A and 7131GASVALVEKIT. Specifically calibrated for natural gas heating systems, it maintains a consistent 4. 0 inch water column output to ensure stable combustion and optimal thermal efficiency. Built
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