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Does this unit require regular maintenance
this thermal expansion tank comes with a factory pre-charge of 20 PSI
when used within the appropriate Maxitrol regulator
providing reliable saturation for high-volume cooling units
Johnson Controls AFS-460-DSS Sensing Switch Els PW 17895 Does this unit require regularFor contractors managing airflow verification in sensitive HVAC systems, the Johnson Controls AFS 460 DSS Sensing Switch provides the redundancy and manual intervention required for critical safety protocols. This industrial grade air pressure sensing switch is designed to monitor positive, negative, or differential air pressure within a range of 1. 25" 0. 06" to 12" w. c. Featuring two SPST normally closed contact arrangements, this dual switch
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