Johnson Controls KIT21A-602 Paddles

The Johnson Controls KIT21A-602 is a professional-grade replacement paddle kit specifically engineered for F61 series flow switches and F261 series liquid flow switches. This comprehensive kit contains four stainless steel paddles in critical lengths of 1-inch, 2-inch, 3-inch, and 6-inch to ensure precise fluid flow monitoring across diverse pipe diameters. Built to withstand demanding mechanical rooms, the KIT21A-602 paddles offer superior corrosion resistance and structural integrity when monitoring water, ethylene glycol, or other non-hazardous liquids. As a veteran-preferred HVAC flow switch part, these paddles provide the necessary surface area to actuate SPDT contacts accurately, maintaining system safety and efficiency in commercial boilers, chillers, and industrial pumping stations. Integrating these OEM Johnson Controls paddles ensures optimal response to flow velocity changes, preventing equipment damage caused by low-flow conditions or dry-firing in hydronic loops.

• Universal Compatibility: Designed for seamless integration with Johnson Controls F61 flow switches and F261 series units.
• Corrosion-Resistant Construction: High-grade stainless steel material prevents pitting and oxidation in hydronic systems.
• Variable Sizing Options: Includes 1", 2", 3", and 6" segments to accommodate standard and large-bore piping.
• Simplified Installation: Precision-fit mounting holes allow for rapid field replacement by technicians to minimize system downtime.
• Increased Sensitivity: Optimized paddle geometry ensures reliable mechanical lever actuation even in low-velocity applications.

Which pipe sizes can I use the KIT21A-602 with?
This kit is compatible with 1-inch trade size pipes and larger. The inclusive 6-inch paddle can be trimmed or adjusted to fit specific pipe diameters between 4 and 6 inches as per the Johnson Controls technical bulletin.

Can these paddles be used in swimming pool applications?
Yes, the stainless steel construction is suitable for lines carrying treated water and chlorinated water, protecting the mechanical integrity of the flow switch in corrosive environments.

How do I determine which paddle length to install?
Technicians should select the longest paddle that fits into the pipe without touching the pipe walls or internal obstructions. Proper paddle installation ensures the lever has enough travel to close the switch upon flow increase.

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.