What happens to the evaporator pressure if the low side float fails?

When the low side float in a refrigeration system fails, it can no longer maintain the proper refrigerant level in the evaporator. This failure typically results in a loss of control over the refrigerant entering the evaporator. As a consequence, the pressure on the evaporator side (low side) tends to increase because the refrigerant may become overcharged.

In a functioning system, the float regulates the amount of refrigerant to ensure that the evaporator operates efficiently and maintains the ideal pressure for heat absorption. With the float malfunctioning, excess refrigerant can flood the evaporator, raising the evaporator pressure. A failure in the float mechanism means there's less control, leading to this higher pressure condition.

Overall, if the low side float fails, the balance in the system is disrupted, resulting in increased evaporator pressure, which can lead to various operational inefficiencies and potential system damage.