Product Description
Supco Ultra 2 Wire Super Boost part number SPR5.
Hard Start Kit Mechanical Potential Relay (MPR) and Start Capacitor, for use on 1 to 3 HP units.
The Supco SPR5 Ultra Start Series Hard Start Kit is engineered to deliver a powerful jolt of starting torque to air conditioning and refrigeration compressors ranging from 1 to 3 horsepower. Featuring a mechanical potential relay (MPR) and a high-capacity start capacitor, this 2-wire kit is ideal for systems experiencing hard-start issues due to low voltage, long line sets, or aging components.
Key Features
- Mechanical Potential Relay (MPR) — Provides precise voltage sensing and reliable compressor engagement
- High-Boost Start Capacitor — 189–227 MFD at 330V for maximum torque during startup
- Simple 2-Wire Installation — No complicated wiring; installs in minutes
- Instant Re-Start Capability — Reduces compressor strain and improves system longevity
- Versatile Compatibility — Works with PSC and CSIR-type compressors in residential and light commercial systems
- UL Recognized & OEM Approved — Built to meet industry safety and performance standards
- NATE Recognized (Course #1867-0002)
- Instant re-start
Specifications:
- Capacitor (MFD): 189 to 227MFD
- Range (HP): 1 to 3HP
- Capacitor Voltage: 330 VAC
- Operating Voltage: 208 to 277 VAC
Replaces
- Supco MPR1
- Kickstart KS-1
- Other mechanical relay-based hard start kits for 1–3 HP compressors
Ideal Applications
- Central air conditioning units with hard-starting compressors
- Heat pumps and refrigeration systems with long line sets
- Units operating in low-voltage environments
- Systems where OEM start components have failed or underperform
Installation Tips
- Disconnect power before installation
- Mount securely near the compressor terminals
- Connect red lead to the run terminal and white lead to the start terminal
- Do not use with scroll compressors or systems requiring electronic relays
