Super Seven Wire Hard Start Kit

Product Overview

The SUPCO SPP7S Hard Start Kit is a two-wire PTC relay and start capacitor assembly designed to provide additional starting torque for single-phase compressor motors in HVAC and refrigeration systems. Engineered for universal compatibility, the SPP7S is part of the SUPCO Super Boost Series and is rated for 90 to 277 VAC operation. The kit assists in reducing light dimming, compressor stall, and start-up time in systems using hermetic compressors, particularly under low voltage or high head pressure conditions.

Technical Specifications

• Manufacturer: Sealed Unit Parts Co., Inc. (SUPCO)
• Model Number: SPP7S
• Series: SPP Super Boost
• Description: Two-Wire Hard Start Kit with PTC Relay and Start Capacitor
• Reference Number: 93834
• Voltage Rating: 90 to 277 VAC
• Torque Increase: Up to 450 oz-in (starting torque assistance)
• Connection Type: Two-wire parallel connection across run capacitor terminals
• Components:
  • PTC (Positive Temperature Coefficient) start relay
  • Start capacitor – sealed, non-polarized
• Function: Provides additional start torque for single-phase compressors in air conditioning and refrigeration systems
• Motor Compatibility: Hermetic compressors in 120V and 230V systems
• Application:
  • Residential and light commercial HVAC systems
  • Refrigeration equipment and heat pumps
  • Compressors operating under low voltage or high load start-up conditions
• Operating Principle:
  • PTC relay energizes start capacitor during compressor start-up
  • Relay automatically deactivates start circuit once motor reaches operating speed
• Installation: Connects across existing run capacitor without altering system wiring; suitable for permanent field installation
• Performance Characteristics:
  • Improves compressor start reliability under adverse conditions
  • Reduces start-up current draw
  • Minimizes electrical stress on windings and contactors
• Construction: Encapsulated components in thermoplastic housing
• Temperature Rating: Suitable for ambient conditions typical to HVAC/R enclosures
• Compliance:
  • Meets applicable UL and CSA performance standards
  • Manufactured under ISO-certified quality control
• Country of Manufacture: United States

Summary

The SUPCO SPP7S Hard Start Kit is a 2-wire, 90–277 VAC PTC relay and start capacitor assembly rated for up to 450 oz-in of torque assistance. Designed for hermetic compressor applications, this Super Boost Series kit enhances compressor starting performance in HVAC and refrigeration systems experiencing low voltage or high starting load conditions.