Daikin-McQuay 025629700 Thermodisc Limit

The Daikin-McQuay 025629700 Thermodisc Limit is a critical safety component engineered for precise thermal management in high-capacity HVACR equipment. This high-temperature limit control switch, manufactured by Therm-O-Disc (Klixon), serves as a primary protection mechanism by interrupting the electrical circuit when internal temperatures exceed safety parameters. As a genuine OEM replacement part, it ensures tight tolerance and specific calibration required for McQuay rooftop units and furnace assemblies. This switch is the designated successor for legacy part numbers 256297B-00 and 256297X-00, maintaining the exact mounting footprint and terminal configuration needed for a field-ready installation. Utilizing a bimetal disc sensor, this limit control provides reliable, snap-action response to thermal fluctuations, preventing heat exchanger damage and ensuring the safe operation of commercial and industrial heating systems.

Key Performance Benefits

• Direct OEM Compatibility: Engineered specifically for Daikin and McQuay equipment to eliminate field modification and ensure proper set-point accuracy.
• High-Temperature Protection: Effectively monitors discharge air or heat exchanger temperatures to prevent thermal runaway.
• Precision Engineering: Manufactured by Therm-O-Disc, utilizing a snap-action bimetal disc for consistent switching and long-term cycling reliability.
• Verified Replacement: Direct cross-reference for 256297B-00 and 256297X-00, ensuring the electrical ratings and reset temperatures match original specifications.

Common Technical Questions

What is the reset type for the 025629700 limit control?
This OEM high-temperature limit switch typically functions as a fixed-temperature control designed to open on temperature rise; please verify your specific model's manual to confirm if it features an automatic or manual reset based on the system's safety logic.

Can I use this as a universal replacement for other brands?
While Therm-O-Disc manufactures many switches, the 025629700 is calibrated specifically for the thermal profiles of Daikin-McQuay HVAC systems. Using an unverified substitute can lead to premature tripping or failure to protect the heat exchanger.

How do I identify a failing thermodisc limit?
Common indicators include the system shutting down on a "limit open" fault code or the indoor blower running continuously while the heating circuit remains de-energized. Always check for airflow restrictions, such as dirty filters or blocked coils, before replacing the limit control.

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.