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AC or heat pump compressor hums but fails to start – SPP6 provides the extra starting torque needed to get the motor spinning under load.
High inrush current during compressor startup trips the circuit breaker; the SPP6 reduces startup amperage draw to prevent nuisance tripping.
System fails to start or struggles when running on a generator or during grid low-voltage events; SPP6 boosts torque to enable reliable startup at reduced voltages (down to 90 VAC).
Compressor takes unusually long to reach operating speed; the PTC relay and capacitor assembly delivers an immediate torque boost for up to 50% faster startup.
Prolonged locked-rotor current causes overheating and motor winding damage; SPP6 shortens the startup phase, reducing thermal stress on the compressor.
💡 Pro Tip: Is Your Compressor Hard-Starting?
Your part is likely the culprit if you notice any of the following:
⚠️ AC or heat pump compressor hesitates or takes a long time to start up
⚠️ System trips the breaker or blows fuses during startup
⚠️ Unit struggles or fails to start when running on a generator or during low-voltage conditions
⚠️ Compressor hums but won't fully start – clicking sound at startup
Before installing, discharge the existing run capacitor safely using an insulated screwdriver across its terminals. Always verify your compressor is PSC (Permanent Split Capacitor) or CSIR type and rated within 1/2–10 HP at 90–277 VAC before fitting the SPP6.
📦 What's in the Box
✅ 1× SPP6 Hard Start Kit – PTC Relay + Start Capacitor Assembly (130–156 MFD, 90–277 VAC, 1/2–10 HP, 2-wire, with piggyback terminals)
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Disclaimer: Compatibility information, part numbers, and model fitment data on this page are sourced from manufacturer databases and third-party references. While we strive for accuracy, please verify your appliance model number before ordering. Heima is not responsible for errors or omissions in compatibility listings.
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