Johnson Controls KNB26A-600R Knob

The Johnson Controls KNB26A-600R is a field-replaceable thermostat adjustment knob specifically engineered for Penn T26, W43, and W45 series controls. This HVAC replacement part is essential for restoring precise setpoint control on heavy-duty line voltage thermostats and humidistats equipped with plastic covers. Built from durable, high-impact plastic, the KNB26A-600R knob assembly includes the integrated trim disc, ensuring a flush fit and professional finish during maintenance or repair. In the field, these knobs are frequently used to replace stripped or missing dials on Johnson Controls plastic cover thermostats where accurate temperature or humidity calibration is critical for system cycling. Whether you are servicing a T26 series cooling control or a W45 series humidistat, this OEM component maintains the mechanical integrity of the user interface without requiring a full controller swap. Professional installation ensures that the dial aligns correctly with the internal potentiometer or switch shaft for reliable operation.

• Direct OEM Compatibility: Specifically designed for Johnson Controls T26, W43, and W45 models with plastic enclosures.
• Complete Assembly: Includes the plastic knob with trim disc to simplify the replacement process and maintain aesthetics.
• Durable Construction: Manufactured from industrial-grade plastic to withstand frequent adjustments in commercial and residential HVAC environments.
• Secure Fitment: Engineered to match the specific shaft profiles of Penn control series, preventing slippage and ensuring accurate setpoint selection.

Which thermostat series is the KNB26A-600R compatible with?
This knob is designed for use with Johnson Controls/Penn T26, T46, W43, and W45 series controls that feature a plastic cover. It is not intended for use with metal-cover industrial controls.

Does this replacement include the mounting hardware or trim disc?
Yes, the KNB26A-600R comes as a knob and trim disc assembly, providing the necessary components to replace a damaged or lost dial in a single step.

Can this knob be used on other brands of HVAC controls?
No, this is a proprietary Johnson Controls replacement part engineered specifically for the mechanical specifications of their Penn series control shafts.

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.