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As an essential component for RPZ valve maintenance
this switch features a fixed 170°F trip point and a 130°F reset differential (40°F drop)
it simplifies field installation for contractors
making it an ideal choice for managing chilled water
the Nordyne D12581R ensures that signal timing for staged heating elements remains precise
Viessmann 7819971 Air Vent L99H008 As an essential component forThe Viessmann 7819971 Air Vent with Shut Off Base is a critical component for maintaining hydraulic stability in high performance condensing systems. Engineered specifically for the Vitodens series, this G3 8" automatic air vent facilitates continuous air elimination from the primary heat exchanger loop, preventing airlocks that compromise heat transfer and cause circulator cavitation. This OEM part is the direct replacement air vent for Viessmann