KMC Controls CTE-3017 Control

The KMC Controls CTE-3017 is a high-performance low limit control engineered for freeze protection within commercial HVAC systems. This vapor-filled freezestat features a 20-foot capillary sensing element designed specifically to monitor ductwork and heating or cooling coils for potentially damaging low-temperature conditions. As a DPDT (Double Pole Double Throw) device, it provides versatile switching capabilities, allowing technicians to simultaneously trip a fan motor and trigger a remote alarm or BMS signal when the sensed temperature across any one-foot section of the bulb drops to the setpoint.

This manual reset model is a critical safety component in stratified airstreams, ensuring the system remains locked out after a low-limit event until a technician can investigate the cause and manually restore operation. The reset mechanism is physically disabled until the temperature at the sensing bulb rises at least 5??F (2.8??C) above the setpoint, preventing premature restarts. The setpoint is easily visible through the front cover and adjustable from the top of the case, while an internal test lever facilitates quick system checkouts and verification of contact operation during routine maintenance.

• Universal Application: Ideal for industrial ovens, process heating, and cold storage facilities requiring robust thermal monitoring.
• DPDT Switching Logic: Dual SPDT contacts enable integrated control of multiple safety circuits or notification devices.
• Vapor-Filled Capillary: Highly responsive 20-foot sensing bulb reacts to the lowest temperature detected at any point along its length.
• Manual Safety Lockout: Prevents automatic equipment cycling after a freeze event, protecting coils and plumbing from repeated exposure.
• Field Service Friendly: Features a visible setpoint scale and an internal manual test lever for on-site commissioning and diagnostics.

Common Questions

Can I reset the CTE-3017 immediately after a trip?
No. The thermal element must sense a temperature increase of at least 5??F above your current setpoint before the manual reset button will engage and close the contacts.

What is the best way to test the switch during commissioning?
Use the manual test lever located under the front cover. This allows you to actuate the DPDT contacts and verify that all downstream safety sequences?Çösuch as fan shutdowns or alarm notifications?Çöare functioning correctly.

Where should the capillary bulb be mounted?
For maximum protection, the 20-foot bulb should be zig-zagged across the downstream face of the coil. It is designed to respond to the coldest one-foot section, making it highly effective at detecting localized freezing spots in stratified air.

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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.