Product Description
Supco Ultra Start Series Super Boost part number SPR1.
Hard Start Kit Mechanical Potential Relay (MPR) and Start Capacitor, for use on 3.5 to 5 HP units.
The Supco SPR1 Ultra Start Series Hard Start Kit is engineered to deliver maximum starting torque for larger HVAC and refrigeration compressors. Designed for 3.5 to 5 HP systems, this 2-wire kit features a mechanical potential relay (MPR) and a high-capacity start capacitor, making it ideal for units that struggle to start due to low voltage, long line sets, or aging components.
Specifications:
- Capacitor (MFD): 270 to 324 MFD
- Range (HP): 3.5 to 5 HP
- Capacitor Voltage: 330 VAC
- Operating Voltage: 208 to 277 VAC
Key Features
- High-Torque Start Assist — Delivers a powerful boost to get large compressors running quickly and reliably
- Mechanical Potential Relay (MPR) — Ensures precise voltage sensing and consistent performance
- Quick 2-Wire Installation — Pre-wired for fast, hassle-free setup
- Instant Re-Start Capability — Reduces compressor wear and improves efficiency
- Universal Compatibility — Works with PSC and CSIR-type compressors in residential and commercial HVAC systems
- UL Recognized & NATE Certified — Meets industry standards for safety and performance
- NATE Recognized (Course #1867-0002)
- OEM approved technology
Replaces:
- MPR1 SUPCO
- KS-1 Kickstart
- Other OEM mechanical relay-based hard start kits for 3.5–5 HP compressors
Ideal Applications
- Central air conditioning systems with 3.5–5 HP compressors
- Heat pumps and refrigeration units with long refrigerant lines
- Systems operating in low-voltage or high-demand environments
- Units with hard-starting or locked rotor issues
