5-2-1 CSR-U1 Hard Start Capacitor Kit for 1 to 3 Ton AC Units

5-2-1 CSR-U1 Hard Start Capacitor Kit

Key Features

• Two-wire hard start kit for single-phase compressors
• Includes a potential relay and start capacitor
• Reduces compressor start-up time and energy consumption
• Assists older or tight compressors with starting
• Installs in series with the compressor run winding

Replaces / Cross-Reference Part Numbers

• CSRU1
• SPP6
• SPP5
• RCO410
• RCO810
• RCO410D
• 88-5440
• HN61PC005
• HN61KA023
• CKFU1

Compatibility & Fitment

• Designed for 1 to 3 Ton (12,000 to 36,000 BTU) air conditioning and heat pump units
• Compatible with single-phase 115V to 288V systems

When to Replace

• Compressor hums but struggles or fails to start
• A/C system causes significant dimming of lights on start-up
• Circuit breaker trips when the compressor attempts to start
• Proactive installation on older units to extend compressor life

Installation Tips

• Disconnect all electrical power to the A/C unit before installation.
• Safely discharge any existing capacitors in the system.
• Connect the two wires from the kit to the compressor's "Run" and "Common" terminals.
• Mount the device securely inside the electrical control panel.
• Professional installation by a qualified HVAC technician is recommended.