Mueller A17921 Manifold 323080-701 Enhanced System Safety: Monitors airflow

Enhanced System Safety: Monitors airflow and draft conditions to prevent heating operation during hazardous venting failures or flue obstructions

preventing air bypass and ensuring seasonal performance

Reliable Fail-Safe Operation: The normally open configuration ensures the valve remains open during power loss for critical bypass or drainage needs

0 Amps) to ensure precise static pressure matching

This 1/2" NPT zone valve is engineered as a two-way normally closed component

Mueller A17921 Manifold 323080-701 Enhanced System Safety: Monitors airflowThe Mueller A17921 ReliefMaster is a heavy duty change over manifold engineered for high demand industrial and commercial refrigeration applications. This HVACR manifold features a 1 2" NPTFE (National Pipe Thread Fuel Extended) inlet and 1 2" NPTFI (National Pipe Thread Fuel Injection) outlets, providing a secure, leak proof transition for dual relief valve setups. With a design pressure (MAP) of 700 psig and a broad operating temperature range of