A Daikin 11112501S Pressure Switch opens or closes the circuit in response to air pressure changes to regulate safe function within the heating and cooling unit.
The pressure switch senses pressure conditions and opens or closes its single-pole, single-throw contact to confirm proper airflow or venting before the heating and cooling equipment continues operating. Its .33" WC rating and SPST design matter because they provide the specific switching response needed for safe, reliable sequencing within the HVAC system.
The pressure switch may be failing if the heating and cooling unit cycles unpredictably, does not start correctly or shuts down when proper pressure confirmation is not being detected. Physical signs can include damaged terminals or cracked housing and environmental signs may include moisture exposure, dirt buildup or corrosion that could interfere with normal switching.
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