The Castair I15312HC4-S is a 15-horsepower, 3-phase industrial air compressor with a horizontal tank and the C4 pump configuration — factory-mounted magnetic motor starter included. The C4 designation in the Castair lineup indicates a larger pump configuration above the C3, designed for maximum output and long-term durability under heavy continuous-duty operation. This is the top of the 15HP 3-phase horizontal tank line.
Configuration Notes
Specific published specifications for the I15312HC4-S — including CFM, RPM, dimensions, and weight — were not available on the Castair product website at the time this description was written. The main Castair industrial series page lists the C3 as the top published configuration for 15HP horizontal tank models. The C4 configuration may be a factory-built or special-order variant. Contact us before ordering to confirm the exact specifications, pricing, and lead time for this specific model.
What the C4 Configuration Means
Based on the Castair industrial pump lineup structure, a C4 pump configuration would represent a larger, slower-turning pump than the C3 (795 RPM, 50.2 CFM at 175 PSI). Larger pump frames in the Castair line run at slower RPM for even lower operating temperatures and longer service life. The trade-off is increased size and weight compared to smaller configurations.
For reference, the documented 15HP 3-phase horizontal options in the Castair line are:
- I15312HC2-S — C2 pump (898 RPM), 45.3 CFM @175 PSI, 69x24x50 in., 980 lbs, with starter.
- I15312HC3-S — C3 pump (795 RPM), 50.2 CFM @175 PSI, 69x24x62 in., 1185 lbs, with starter.
- I15312HC4-S (this unit) — C4 pump (specifications contact us for confirmation), with starter.
Included with Unit
- 15HP 3-phase industrial motor — 1725 RPM, 15% service factor minimum.
- 120-gallon horizontal ASME-certified tank.
- Magnetic motor starter — factory mounted.
- All cast iron pump construction.
- Metal belt guard, totally enclosed.
- Copper discharge tube or stainless-steel braided flex line.
- ASME safety valve.
Technical Specifications
- Model Number: I15312HC4-S
- Horsepower: 15 HP
- Phase: 3-phase
- Tank Capacity: 120 gallons, horizontal (estimated)
- Pump Configuration: C4
- Magnetic Starter: Included (factory mounted)
- Tank Certification: ASME
- Note: CFM, RPM, dimensions, and weight — contact us for confirmed specifications before ordering.
Why Buy From Air Compressor Factory Direct?
We have specialized in industrial air compressors since 2016. For C4 configuration units or any non-standard Castair configuration, call us before ordering. We can confirm current availability, lead time, exact specifications, and pricing directly with the factory. Free shipping, free pre-sale technical support, full manufacturer warranty on every unit.
Call 866-217-0063 for quick answers and help!
