Carrier HC95DA670 Start Relay

The Carrier HC95DA670 Start Relay and Capacitor Assembly is a critical OEM replacement part designed for high-torque compressor demand in residential and commercial 208/230V single-phase systems. Operating at 60 Hz with a robust 502 VAC rating, this potential relay manages the initial electrical inrush to the starting windings, ensuring reliable motor ignition even under low-voltage conditions or high static pressure. This assembly is a direct replacement for Carrier, Bryant, and Payne units, specifically replacing legacy part numbers such as HC95DE040. Utilizing a 216-259 MFD start capacitor, it provides the necessary phase shift to successfully initiate the cooling cycle. For technicians performing HVAC system diagnostics, this genuine Carrier part eliminates the guesswork of universal "hard start" kits by maintaining the original factory-specified timing and dropout voltage of the relay. This ensures precise compressor engagement and protects the internal motor windings from excessive heat during the start-up sequence.

• Factory-Spec Performance: Engineered as a genuine RCD parts component to match original equipment electrical characteristics.
• Enhanced Compressor Life: Reduces the duration of locked-rotor amperage (LRA) during startup, minimizing thermal stress on the motor.
• Broad Compatibility: Fits a wide range of Carrier-family models, including 38CKB, 38TDB, and 38YDB series units.
• Durable Construction: Built to withstand rigorous environmental conditions within the outdoor control box without performance degradation.

How do I troubleshoot a failing HC95DA670 relay?
If you hear a persistent clicking sound from the control box but the compressor fails to turn over, use a multimeter to check for continuity across the relay terminals and verify the capacitance of the start capacitor. A visual inspection for bulging or leakage on the capacitor is also recommended.

Is this relay compatible with non-Carrier equipment?
While designed for Carrier-branded systems, this is a potential-style relay and capacitor assembly. Technicians should verify the dropout voltage and MFD requirements of the specific compressor before attempting any cross-brand installation.

Do I need to remove the existing start thermistor?
Yes, when installing this start relay and capacitor assembly on units previously equipped with a start thermistor (PTC), the thermistor must be removed as per the official manufacturer wiring diagram to prevent electrical interference.

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.