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the high-acid 48-DA core is typically recommended
the light will remain off
Automatic Reset Functionality: Restores system operation automatically after the unit cools
Verify coil voltage
making it ideal for standard 208/230V commercial and residential equipment
Trane CNT1220 Limit Switch the high-acid 48-DA core isThe Trane CNT1220 (officially updated to CNT01220) is a high limit thermal safety control engineered for precise HVAC over temperature protection. Designed as a direct OEM replacement part, this 160F auto limit switch monitors the supply plenum temperature to prevent heat exchanger damage or unsafe operating conditions. Utilizing a normally closed SPST (Single Pole Single Throw) contact configuration, it interrupts the gas valve or heating circuit
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