Supco SPP7S Hardstart

The Supco SPP7S Hard Start Kit is a professional-grade combination relay and start capacitor designed to resolve compressor startup issues in single-phase AC and refrigeration systems. Engineered for PSC and CSIR units ranging from 4,000 to 120,000 BTU (1/2 to 10 HP), this component delivers up to 600% additional starting torque. This is critical for systems with tight tolerances or those operating under high head pressures. The SPP7S utilizes a potential relay mechanism to drop the capacitor out of the circuit immediately after the motor reaches speed, protecting the start windings from overheating. This 2-wire hard start is compatible with 120V to 288V systems, making it a versatile tool for HVAC compressor troubleshooting. By reducing the duration of locked rotor amperage (LRA), it stabilizes system performance and addresses low voltage start-up problems common in older air conditioning units.

Technical Benefits

• Universal Compatibility: Works with all single-phase systems from 1/2 HP through 10 HP.
• High Torque Output: Provides a 600% boost to overcome mechanical friction and high pressure.
• Efficient Installation: Simple 2-wire connection to the existing run capacitor terminals.
• Potential Relay Technology: Ensures precise capacitor cutout to prevent winding damage.

Common Questions

Can the SPP7S be used on scroll compressors?
Yes, the Supco SPP7S is effective for both reciprocating and scroll compressors, particularly in systems with non-bleed TXVs where pressure equalization is slow.

Does this replace a 3-wire hard start kit?
While a 3-wire kit uses a separate potential relay, the SPP7S integrates the relay and capacitor into a 2-wire configuration, providing a simplified installation for PSC motor starting.

What is the voltage range for this capacitor?
This unit is designed for 120V to 288VAC applications, covering standard residential and commercial HVAC equipment.

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.