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Small rectangular HVAC hard-start kit, black plastic housing with two wire terminals

SUPCO

SUPCO SPP5 Super Boost HVAC Control 1/2-10 hp 90-277 VAC

SKU CH-S4TF-P5K1J

Hard-start kit with PTC relay and start capacitor boosts compressor torque 300% for 1/2-10 hp units at 90-277 VAC

  • Easy 2-wire installation saves technician time
  • PTC relay and start capacitor boosts torque by 300%
  • NATE recognised training course 1867-0002 validates performance
  • UL recognised component meets safety standards
  • Operates 90-277 VAC across 1/2-10 hp compressors

SUPCO SPP5 Super Boost Hard Start Kit

The SUPCO SPP5 Super Boost is a hard start kit that combines a positive temperature coefficient relay with a start capacitor. It is designed for single-phase air-conditioning or refrigeration compressors ranging from 1/2 to 10 horsepower. The kit helps overcome low voltage situations and hard starting compressors by increasing starting torque by 300 percent.

Easy two-wire installation with PTC relay

Installation uses a simple two-wire connection that does not require a separate potential relay or additional wiring complexity. The positive temperature coefficient relay manages the capacitor engagement automatically as temperature changes. The most common issue is selecting the wrong capacitor size range for the specific compressor model, which can prevent proper starting or cause overheating.

Check compressor voltage and horsepower range

Verify that the compressor operates within the 90 to 277 VAC range and falls inside the 1/2 to 10 hp recommendation before ordering. Confirm the unit is a permanent split capacitor type compressor, as the kit is intended for PSC applications. Ensure the existing capacitor specifications align with the 43 to 53 microfarad range provided by this kit.

Highlights

  • Easy 2-wire installation saves technician time
  • PTC relay and start capacitor boosts torque by 300%
  • NATE recognised training course 1867-0002 validates performance
  • UL recognised component meets safety standards
  • Operates 90-277 VAC across 1/2-10 hp compressors

Specifications

BrandSUPCO

Questions about this item

How can I verify the SPP5 Super Boost is operating correctly after wiring the two leads?

The PTC relay should click once during compressor start-up and the unit should run without tripping the overload, confirming the 300% torque increase is active.

What components are included with the SPP5 kit for installation?

The kit contains the PTC relay and start capacitor assembly with two pre-attached wires for direct connection to the compressor terminals.

Which compressor horsepower rating should I match to the SPP5 model?

Choose the SPP5 when the compressor nameplate shows 1/2 to 10 hp and operates on 90-277 VAC single-phase power.

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