Which temperature level triggers water temperature supervision for cold weather monitoring?

• A. 32°F
• B. 36°F
• C. 40°F
• D. 44°F

Answer: (C)

Water temperature supervision for cold weather monitoring is intended to catch a drop in the water’s temperature before it reaches freezing, so maintenance can act to protect the system. The setpoint is 40°F because it provides a safe margin above freezing, giving an early warning to address heating, insulation, or antifreeze measures. If the water falls to 40°F or below, the system flags a supervision condition, prompting investigation and corrective action before freezing could cause damage or block water flow. A lower point like 32°F would come too late, and 36°F or 44°F would either miss the risk or trigger alarms too late or too early. Hence, 40°F is the standard trigger.