Supco SPP7S Hardstart and Ducane models using the

and Ducane models using the 31J9101 specification

extending the life of the commercial refrigeration pressure switch

allowing for clear visibility and access to dual-dial configurations commonly found in heating-cooling pneumatic thermostats like the T-4756 high-volume output models

Whether you are performing commercial heater maintenance on an ARWH series unit or optimizing industrial ventilation systems

Common Questions What is the microamp signal range for the Y75AA-3

Supco SPP7S Hardstart and Ducane models using theThe 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