[Lifetime Warranty] CSR-U2 Hard Start Capacitor Kit - Fits Air Conditioner 3 1/2 to 5 Ton Units

CSR-U2 Hard Start Capacitor Kit

Key Features

• Combines a high-power starting capacitor with an electronic potential relay.
• Increases compressor starting torque for faster, more reliable start-ups.
• Reduces start-up time, minimizing electrical stress on compressor windings and run capacitor.
• Lowers inrush current, preventing light dimming and nuisance circuit breaker trips.
• Designed as a three-wire kit for straightforward installation.

Replaces / Cross-Reference Part Numbers

• CSR-U2
• Replaces various OEM and aftermarket hard start kits with similar voltage and tonnage specifications.

Compatibility & Fitment

• For use with single-phase 208V, 230V, and 265V air conditioning and heat pump systems.
• Designed for compressors rated from 3.5 to 5 tons.
• Compatible with residential and light commercial PSC (Permanent Split Capacitor) compressor motors.

When to Replace

• Install when the compressor struggles to start, especially during high ambient temperatures.
• Recommended if lights dim noticeably when the A/C or heat pump activates.
• Addresses issues of humming or buzzing noises from the compressor during failed start attempts.
• A solution for frequent circuit breaker tripping upon system start-up.
• Can be installed proactively on aging systems to extend compressor and component life.

Installation Tips

• Disconnect all electrical power to the HVAC unit at the breaker and service disconnect before beginning work.
• Verify the kit's specifications match your system's voltage and compressor tonnage rating.
• Mount the device securely inside the control panel, away from excessive moisture and moving parts.
• Follow the included wiring diagram precisely to ensure correct connections to the run capacitor and compressor terminals.
• Confirm all wire connections are tight and properly insulated before restoring power.