Carrier 37AG900062 Variable Air Volume Control Kit R 410A this T&P relief valve provides this T&P relief valve provides dual action protection against both excessive temperatures and over pressurization This ASME Section IV certified valve is a standard replacement for HVAC contractors maintaining large boilers where reliable thermal expansion protection is non negotiable Common Questions: What causes a condensate trap to fail in these systems The Carrier 37AG900062 Variable Air Volume Control Kit is a critical replacement component for maintaining secondary heat exchanger drainage and condensate management in high efficiency furnaces