What effect does a detached TXV sensor bulb have on an air conditioning system?

A detached TXV sensor bulb can lead to a scenario where the system experiences high suction pressure coupled with high discharge pressure. When the TXV (Thermostatic Expansion Valve) sensor bulb is not in proper contact with the refrigerant line or is completely detached, it fails to accurately sense the temperature and pressure of the refrigerant.

The TXV regulates the flow of refrigerant into the evaporator based on the load condition. If the sensor bulb is detached, the TXV may not open or close correctly, causing an imbalance in the system. This improper regulation can lead to an excessive flow of refrigerant or insufficient refrigerant reaching the evaporator.

As a result, the suction pressure increases because the evaporator is not absorbing heat efficiently, leading to less vaporization of refrigerant. Simultaneously, the discharge pressure can also rise due to the compressor working harder to move the refrigerant that isn't being evaporated properly, thus reflecting a high discharge pressure as well. Therefore, the correct answer accurately reflects this potential issue within the system.