In a chilled water system using refrigerant 134-a, what may indicate a leak in the evaporator shell?

In a chilled water system utilizing refrigerant 134-a, one of the primary indicators of a leak in the evaporator shell is the activation of the refrigerant monitor alarm. This alarm is specifically designed to detect the presence of refrigerants in the air, signaling that refrigerant is escaping from the system. When there is a leak, refrigerant levels drop, leading to an increase in the concentration of refrigerants in the surrounding atmosphere, which the monitoring system is programmed to detect. Upon detection, it triggers the alarm to alert operators about the potential hazardous situation.

Monitoring systems for refrigerants are crucial for safety and preventing environmental harm, making the presence of an alarm an immediate sign of a leak that requires attention and action.