A Lochinvar 100276815 Pressure Switch senses pressure changes and opens or closes the circuit to regulate safe performance when the machine is in use.
The pressure switch monitors pressure conditions within the HVAC system and signals the control sequence only when proper airflow or venting is present for safe operation. Its .58" WC calibration and switch construction matter because they provide the specific response needed to keep the heating and cooling unit operating reliably under designed conditions.
The pressure switch may be approaching replacement if the heating and cooling equipment shows intermittent startup, unexpected shutdowns or fails to complete its normal operating sequence when pressure conditions should be met. Physical signs can include visible wear, corrosion or damaged terminals and environmental signs may include moisture exposure, dust buildup or residue that could affect accurate switching.
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