Century (Regal Rexnord, ex-A.O. Smith)
Century Compressor Duty 1φ
Big-box store tank-mount replacement motors.
Nameplate
- Phase
- Single-Phase
- HP range
- 1 – 7.5 HP (advertised 'SPL' ratings vary)
- Voltage codes
- 115/230 V · 230 V
- NEMA frames
- 56 – 184T
- Enclosure
- ODP
- Poles / RPM
- 2 (3450 RPM typical)
- Efficiency
- Standard
- Insulation class
- B
- Service factor
- 1.0 – 1.15 (nameplate varies)
Lead connection diagrams
Single-phase capacitor-start (CW rotation)
L1 ── T1 (main) L2 ── T4 (main) Start winding: T5-T8 with start cap + centrifugal switch Rotation reverse: swap T5 and T8
For CCW rotation, swap the two start-winding leads (T5↔T8), not the line leads.
Field notes
- Watch for inflated 'SPL' (Special) horsepower ratings — the true continuous HP is usually the FLA/SF math, not the sticker number.
- Use nameplate FLA for overload sizing, never the marketing HP.
The connection charts above are the NEMA MG-1 industry-standard patterns most brands follow. Always confirm the exact chart printed inside your motor's peckerhead lid before landing leads — voltage-code and lead-tag conventions vary between OEMs and production years.
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