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making it the current standard for many wall-mount HVAC applications
meaning the circuit completes only when the 24V coil is energized
As a veteran tech
Common Questions & Technical Support How do I test the 42-21786-81 coil
Johnson Controls P100DA-35 Pressure Control making it the current standardThe Johnson Controls P100DA 35 is a heavy duty encapsulated pressure control engineered for high pressure cut out applications in commercial HVACR systems. This direct mount pressure switch features an SPST contact configuration designed to open on pressure rise at 350 PSIG. Built with open construction for versatile integration, the P100DA 35 includes a manual reset lockout mechanism, ensuring the system remains offline until a technician verifies
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