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The Bard 8620-238 Low Pressure Board (MV4000) is a critical replacement control board designed for precise monitoring of refrigeration circuit protection in Bard HVAC units
especially as it serves as the OEM-specified direct replacement for 071-0660-01 and 571-0065-05
and commercial unitary systems
Use a multimeter to verify the control signal before replacing the component
including glycol-based loops and high-temperature heating water
Viessmann 7835169 Ionization Electr. 322838-754 The Bard 8620-238 Low PressureThe Viessmann 7835169 Ionization Electrode is a critical flame sensing component engineered specifically for high capacity Vitodens 200 W B2HA condensing gas boilers. Designed to handle the rigorous thermal demands of the B2HA 399 and 530 models, this electrode provides the millivolt signal necessary for the burner control unit to verify flame presence safely and consistently. This kit includes the required electrode gasket to ensure a gas tight seal
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