SPP Super Boost Hard Start Kits — SPP5 & SPP6 give single-phase A/C compressors the grunt they need on tough starts. PTC relay + start cap, simple 2-wire install, and UL-recognised construction — quick wins for stubborn PSC compressors. Bloody good value for service calls.

Key Features & Trade Benefits

• PTC relay + start capacitor — proven Super Boost design for extra starting torque without complex wiring.
• Two-wire install — fits fast across the run circuit per wiring diagram; less downtime, more jobs done.
• PSC compressor compatible — targets hard-starting single-phase units found across split and package systems.
• UL® Recognised — confidence for commercial sites and compliance paperwork.
• Wide operating voltage (90–277 VAC) — suits most AU single-phase installs.
• Economical fix — reduce nuisance trips and short cycling from marginal supply or long lines without replacing the compressor.

Why This Product Matters

Real-world: on a steamy Brisbane arvo, a 2.5-ton split kept stalling on start after a long line-set install. We fitted an SPP6, verified the run cap value, and the unit fired clean with no lights dimming — customer happy, call-back avoided. That’s a fair dinkum fix when supply is marginal. (Always check OEM guidance before adding start assist.)

Need other starters and caps? See our Start Capacitors to match the job.

Pro Tip

Pick the kit by torque requirement, not tonnage alone. SPP5 (≈300% torque, 43–53 µF) handles many light-to-medium applications; SPP6 (≈500% torque, 130–156 µF) is the go-to when compressors are really stubborn — long pipe runs, low mains, or hot starts. Verify run capacitor health first with a proper MFD tester and follow the wiring diagram — she’ll be right.

Compatibility & System Info

• Compressor/Motor type: Permanent-split-capacitor (PSC) single-phase only; not for 3-phase.
• Voltage: 90–277 VAC (check nameplate/OEM docs).
• Install: 2-wire connection across the run circuit per instructions. If unsure, engage a licensed sparky per AU regulations.
• Typical use: Tough starts due to long lines, low supply, high ambient, or aging compressors.

What’s Included

• SPP Super Boost module (PTC relay + start capacitor) — model as selected (SPP5 or SPP6)
• Pre-attached leads

Specifications

*HP guidance from distributor listings; always confirm against OEM documentation for the specific compressor.

Warranty & Returns

Backed by manufacturer warranty. For shipping and returns, see our site policy (AU).

FAQs

SPP5 or SPP6 — which one?
SPP5 (~300% torque) suits many standard starts. Choose SPP6 (~500% torque) for tougher cases (long lines, hot ambients, low supply).

Will this work on scroll compressors?
If the unit is single-phase PSC and the OEM permits a start assist, yes. Always check the equipment manual.

Is installation DIY?
It’s a simple 2-wire kit, but Australian electrical work has legal requirements — use a licensed electrician and follow safe isolation.

Related Products

• Confirm cap health first — the SUPCO MFD10 Capacitor Tester makes diagnosis faster and avoids guesswork.
• Replacing caps at the same time? Our Start Capacitors range covers common MFDs for HVAC motors.

Electrical work in Australia must follow recognised safety practices. See Safe Work Australia’s Code of Practice: Managing electrical risks in the workplace.