Johnson Controls KNB20A-602R Replacement Knob A19 28'S

The Johnson Controls KNB20A-602R is an accessory knob for A19 and A28 series thermostats and replaces the standard knobs. It is specially designed for controlling airflow in HVAC systems. It has a spring range of 4-10 PSI and has a 3/4" stroke to operate dampers up to 20 sq ft. Due to the direct mount design, the installation on the damper shaft is seamless. Due to the accurate control of airflow, this replacement knob aids in the proper functioning of the HVAC system. It allows the setting of accurate temperatures to improve comfort and reduce energy consumption. Also, it assists in increasing the useful life of HVAC equipment as it does not put a lot of pressure on some of the parts.