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The permanent split capacitor (PSC) design requires a matched run capacitor (typically 5 MFD/370V) for proper starting torque and thermal management
maintaining compatibility while improving internal performance
Direct OEM Fitment: Replaces part number 239-40918-00 with exact lead length and terminal connections
Any oil or moisture contamination in the 15-30 psig main air line will cause internal failure and signal drift
Trane THT2542 Limit Switch 319848-301 The permanent split capacitor (PSC)The Trane THT2542 Limit Switch is a critical safety component designed for precise thermal monitoring in Trane HVAC systems, including residential furnaces and air handlers. This OEM replacement part (also identified by part number THT02542) is engineered as an L130 20F limit switch, meaning it is set to open the circuit at 130F and close with a 20F differential (re closing at 110F). This automatic reset function ensures the unit interrupts operation