Common Questions: Where is the limit switch located on a Lennox furnace

making it compatible with all standard nitrogen

Durable Construction: Engineered to handle high-temperature environments without calibration drift

Use the integrated Schrader access valve located on the shell to take accurate readings and determine when the internal element is restricted

Versatile Compatibility: Integrated 1/4" barb fittings allow for quick connection to standard pneumatic diagnostic lines

Johnson Controls P400AD-2 Pressure Switch Freon Common Questions: Where is theSingle Point Differential Oil Pressure Switch, 12. 75 0. 75 Psid Open Point ( Differential Pressure ), Less than or Equal to 4. 5 Psid Close Point ( Differential above Open Point ), 3 4" Threads, Includes Wiring Harness ( WHA P400 100 ) P400AD 2 is the direct replacement for P300AD 2