What happens if a TEV sensing bulb becomes detached from the suction line?

When a TEV (Thermostatic Expansion Valve) sensing bulb becomes detached from the suction line, it can lead to a series of changes in system pressure that are indicative of improper regulation by the valve. The sensing bulb's primary role is to monitor the temperature of the refrigerant in the suction line and help control the valve accordingly to ensure an optimal flow of refrigerant.

If the sensing bulb is detached, it cannot accurately gauge the temperature of the refrigerant, leading the valve to open excessively. As a result, too much refrigerant enters the evaporator coil, causing an increase in suction pressure. This influx of refrigerant allows more vapor to build up in the system, which subsequently contributes to higher than normal discharge pressure since the compressor has to work harder to compress the increased vapor volume.

Thus, the correct answer highlights that the outcome of a detached sensing bulb is an increase in both suction and discharge pressures due to the improper management of refrigerant flow. The extra strain on the system can lead to inefficiencies and potential damage if left unchecked.