Johnson Controls KNB20A-602R Replacement Knob

The Johnson Controls KNB20A-602R Replacement Knob is a specialized mechanical interface designed for precision calibration and adjustment of A19 series and A28 series temperature controls. Engineered for seamless integration with Penn A19 thermostat models and dual-stage A28AA-4 or A28AB-29 controllers, this high-impact replacement component ensures accurate setpoint selection in demanding refrigeration and HVAC applications. Technical professionals utilize this original equipment manufacturer (OEM) replacement part to restore tactile feedback and operational control to remote bulb temperature controllers when original knobs are sheared or degraded. Whether you are servicing Johnson Controls thermostat parts in industrial chillers or commercial walk-in coolers, the KNB20A-602R provides the exact spline fit required for slip-free performance. Avoid generic alternatives that can lead to misaligned setpoints; stick with verified HVAC replacement knobs to maintain system integrity and prevent environmental drift in temperature-sensitive zones.

• Direct Compatibility: Engineered specifically for Johnson Controls A19 and A28 series devices, including models A28AA-4 and A28AB-29.
• Precision Calibration: Facilitates accurate setpoint adjustments for industrial temperature controls and Penn series thermostats.
• Industrial Durability: Rugged construction withstands high-frequency use in professional mechanical refrigeration environments.
• Rapid Deployment: Simple press-fit installation allows for immediate restoration of equipment functionality without dismantling the control housing.

Which thermostat models use the KNB20A-602R?
This knob is the designated replacement for the Johnson Controls A19 series (single-stage) and the A28 series (two-stage) remote bulb temperature controls.

Can this knob be used on other Penn or Johnson Controls series?
While it fits most standard A19 and A28 shafts, verify your specific model number against technical documentation to ensure exact spline alignment and graduation accuracy.

Is this a universal HVAC knob?
No, this is a brand-specific replacement part designed for Johnson Controls equipment to ensure the dial matches the internal potentiometer or mechanical switch mapping.

This item is not eligible for free shipping.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.