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Exact OEM Calibration: The
Reliable Switching: Features SPST (Single-Pole Single-Throw) action capable of handling motor loads up to 1/4 HP
Durable Construction: Built with high-grade materials to tolerate high-temperature furnace blower environments
Versatile Media Handling: Suitable for water and glycol-based systems with fluid temperatures ranging from 32° to 200°F
It is typically used in horizontal ducts where the width exceeds the height
Tjernlund Products PS1503 Switch 326058-757 Exact OEM Calibration: TheThe Tjernlund Products PS1503 is a high sensitivity duct pressure switch engineered to automate HVAC accessories by detecting positive air pressure within the supply plenum or trunk lines. As the direct replacement for DFS 221 227, this SPST normally open switch simplifies field installations by eliminating the need for complex interlock wiring with the furnace blower. The PS1503 duct airstat features a snap acting mechanism triggered by a precise