while the MKC-2 is the larger standard required for higher-capacity valves such as the B19 or E25 series

Refer to the technical datasheet for specific terminal connections

The Armstrong Furnace H2TXV03 TXV Valve is a high-precision thermostatic expansion valve designed to regulate refrigerant flow with industrial accuracy

ensuring that the system restarts without manual intervention once water temperatures return to safe operating levels

Trane SWT2074 Limit Switch 320819-301 while the MKC-2 is theThe Trane SWT2074 Limit Switch is a critical electromechanical safety control engineered for high precision temperature monitoring in Trane HVAC systems, including furnaces and air handlers. Designed with a bimetallic strip mechanism, this high limit switch is calibrated to trigger at 175F (L175) with a 30F differential, ensuring the system shuts down the gas valve or heating elements if internal temperatures exceed safe operating parameters. This OEM