The Trane CPT1166 is a heavy-duty 25/4 MFD 440V Round Run Capacitor engineered specifically for performance in residential air conditioning and heat pump systems. As a dual-run component, it provides the necessary phase shift for both the compressor and fan motor, ensuring smooth startup and operation under high-load conditions. This unit serves as a critical OEM replacement capacitor for several American Standard and Trane condenser models, maintaining the electrical integrity required to prevent motor overheating and premature failure. Field technicians will recognize this as the superseding part for multiple legacy numbers, including CPT01166 and 27L685. Rated for 440 VAC, it can safely replace 370V versions while providing increased dielectric strength. Constructed with metallized polypropylene film and featuring a pressure-sensitive interrupter, this HVAC dual run capacitor meets the EIA-456 standards for 60,000-hour reliability. Whether you are performing a seasonal tune-up or an emergency repair, utilizing a genuine Trane replacement capacitor ensures compatibility with the existing wiring harness and mounting brackets. Key Benefits Direct OEM Compatibility: Engineered to replace Trane CPT1166, CPT01166, and 27L685 without modifications. Enhanced Dielectric Strength: Rated at 440V to handle voltage spikes better than lower-rated 370V alternatives. Reliable Performance: Dual 25+4 microfarad rating supports both the HVAC compressor and condenser fan simultaneously. Industrial Standard Compliance: Built to EIA-456-A specifications and UL listed for safety and long-term durability outdoors. Common Questions Can I use a 440V capacitor if my old one was 370V? Yes, you can always go up in voltage rating. The 440V Trane capacitor is a standard upgrade for 370V units as it handles electrical stress more effectively, though you must always match the 25/4 MFD capacitance exactly. What are the signs this dual run capacitor has failed? Common indicators include a humming compressor that fails to start, a fan motor spinning slowly, or physical bulging of the round run capacitor casing. If the microfarad reading on your multimeter is more than 5% out of spec, it needs replacement. Does this part replace the CPT01166? Yes, the CPT1166 is the current replacement part for CPT01166 and is functionally identical in capacitance and form factor. 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.
