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If your unit was originally equipped with an electronic control
While cleaning with a very fine abrasive (like a Scotch-Brite pad) can temporarily restore a microamp signal
ensuring a fail-safe position when power is interrupted
Durable Construction: Features a rugged housing and a standard 1/4" barbed fitting for reliable hose attachment under thermal stress
Johnson Controls P47AA-4 Pressure Control 30067439-890 If your unit was originallyThe Johnson Controls P47AA 4 Pressure Control is a heavy duty steam pressure limit control engineered for high limit cutout or operating control in commercial and industrial steam heating systems. This SPST pressure switch is designed to provide professional grade reliability, featuring contacts that open on pressure rise to safeguard against overpressure conditions. With a versatile electrical rating of 120 208 240 277 Vac, the P47AA 4 integrates