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Symptoms include the system being stuck in one mode (heating or cooling only) or a minimal temperature difference (less than 3°F) between the suction lines
these parts are physically and technically identical
It is recommended to inspect the motor shaft and set screw during removal
two piston O-rings
the red button must be depressed once the furnace cools down and the underlying airflow issue is corrected
Trane CNT4990 Pressure Control 320788-703 Symptoms include the system beingThe Trane CNT4990 is a high precision HVAC air pressure control switch engineered for critical monitoring in residential and light commercial systems. This OEM Trane replacement part features a fixed set point of 0. 26" WC, making it a vital safety component for sensing draft in inducer fan assemblies and ensuring proper airflow before ignition. With its SPST (Single Pole Single Throw) contact configuration, the CNT4990 provides reliable circuit