Description
The Rheem-Ruud SP21090B Pressure Switch is to monitor the air pressure in furnace or boiler venting, and combustion airflow circuits. It reacts to changes in the pressure differential to provide better system operation by alerting control components, when airflow conditions fall within specified limits. It is mounted in heating equipment assemblies to control the timing of the blower and ignition sequence within HVAC systems. It is used for service or replacement of original pressure control parts in residential and light commercial units. It operates in safety and control circuits to provide constant operational during heating cycles in controlled airflow conditions.
