A refrigerant sensor which will sound an alarm and automatically start a ventilation system in occupied equipment rooms falls under ASHRAE Standard;

The correct choice is based on the focus of ASHRAE Standard 15, which is specifically designed to address safety concerns related to the use of refrigerants in occupied spaces. This standard outlines requirements for the design and operation of systems using refrigerants to minimize the risk of refrigerant leaks and ensure the safety of occupants.

One key aspect of Standard 15 is the incorporation of safety measures such as refrigerant sensors. These sensors are essential for detecting refrigerant leaks and are required to trigger alarms and initiate ventilation systems to ensure that any potential exposure to harmful refrigerants is mitigated. The effective implementation of these safety protocols enhances occupant safety and supports the overall integrity of HVAC systems.

In contrast, the other standards listed focus on different aspects of refrigeration and HVAC systems. For example, ASHRAE Standard 34 deals with the classification of refrigerants and their environmental impact, while Standard 44 specifically addresses the performance of certain heat exchangers. Standard 60 pertains to the safety of drinking water, which is unrelated to refrigerant safety in occupied spaces. Therefore, the context regarding refrigerant safety and the specific functionalities described aligns accurately with ASHRAE Standard 15.