Castair 7.5 HP 3-Phase Rotary Screw Air Compressor — Vertical Tank, 230V (R738VP75-230)
The Castair R738VP75-230 is the vertical-tank version of the 7.5 HP 3-phase rotary screw lineup, wired for 230V. It delivers 31 CFM at 100 PSI on 100% duty cycle — same output as the horizontal R738HP75-230, but with a significantly smaller floor footprint at 34 x 26 x 70 inches. If your shop is space-constrained — especially in width — the vertical layout tucks into a corner more easily than the 64-inch-long horizontal version. Weight is identical at 546 lbs. Standard operating pressure is 135 PSI, with factory options for 150 or 175 PSI.
Horizontal vs. Vertical — Which Layout Fits Your Shop?
The choice between R738VP75-230 (vertical) and R738HP75-230 (horizontal) comes down to ceiling height, aisle width, and where you plan to anchor the unit. The vertical tank is taller at 70 inches — confirm your ceiling height and check that a forklift or pallet jack can position it. The horizontal unit is longer but lower and easier to move through standard shop doors. Both deliver identical air output. Neither has a performance advantage — pick based on your floor plan.
Air End and Drive System
- Duty cycle: 100% — continuous operation rated
- Air end: P75 rotary screw, single solenoid control — no computers, no lockout codes
- Motor: Heavy-duty industrial 1725 RPM, 15% service factor or higher
- Drive: Off-shelf V-belts with adjustable belt tightener
- Lubrication: Factory-filled 4,000-hour / 1-year synthetic CAST-LUBE oil
- Oil filter: Spin-on automotive-type
- Air filter: Paper element (P75 series)
Controls and Safety
- Pressure and temperature gauges: Easy-read, standard
- High pressure shutdown: Standard
- Dual high temperature shutdown: Standard
- 10-minute shutdown timer: Standard — cuts electricity when demand drops
- No lockout codes: Service without dealer intervention
Tank and Cooling
- Tank capacity: 80 gallons, vertical
- Tank certification: ASME (USA-made)
- Air/oil separator: Built-in with spin-on filter
- Aftercooler: Air-cooled aftercooler and oil cooler, removable for cleaning
- Plumbing: Off-shelf copper piping throughout
Electrical
- Voltage: 230V, 3-phase
- Starter: Name-brand magnetic starter, factory mounted and wired
- 460V option: Available as R738VP75-460
Maintenance
- Hour meter: Standard
- Oil and separator filters: Spin-on — no special tools
- Belt service: Off-shelf V-belts, adjustable tensioner
- PM kit: MKD3-4 (D3, D31, D4 air ends, 5-10 HP) — 10% savings on 2 air filters, 4 oil filters, 1 separator, 5 gal oil
What Is in the Box
- Castair R738VP75-230 rotary screw compressor, fully assembled
- 80-gallon vertical ASME tank
- Air-cooled aftercooler and oil cooler
- Magnetic starter and controls, factory wired for 230V
- Hour meter
- Pressure and temperature gauges
- Factory fill CAST-LUBE synthetic oil
Vibration pads (VP1004), ball valve, and flex hose are recommended — available factory-mounted or separately.
Available Configurations
- R538VP75 — 5 HP, 3-phase, 80 gal vertical, 20 CFM, 34x26x70, 470 lbs
- R738VP75-230 (this unit) — 7.5 HP, 3-phase, 230V, 80 gal vertical, 31 CFM, 34x26x70, 546 lbs
- R738VP75-460 — Same, 460V 3-phase
- R738HP75-230 — Same specs, horizontal layout, 64x32x44
- R1038VP75 — 10 HP, 3-phase, 80 gal vertical, 40 CFM, 34x26x70, 585 lbs
- R15312VP75 — 15 HP, 3-phase, 120 gal vertical, 52 CFM, 44x32x73, 765 lbs
When Does a Shop Need This vs. Stepping Up or Down?
Order this if: You have 3-phase 230V service, need continuous 31 CFM, and prefer the vertical layout to save floor length. Best for shops with at least 8-foot ceilings and where width is more constrained than height.
Step up to R1038VP75 if: You are running more than 3 continuous air tools or need 40 CFM.
Step down to R538VP75 if: Your shop runs one lift and one or two occasional air tools.
Choose horizontal if: You have low ceilings or the 70-inch height is a problem for your space.
Technical Specifications
- Model: R738VP75-230
- Horsepower: 7.5 HP
- Phase: 3-phase
- Voltage: 230V (460V available as R738VP75-460)
- CFM @ 100 PSI: 31
- Standard operating pressure: 135 PSI (150 or 175 PSI available)
- Duty cycle: 100%
- Tank size: 80 gallons, vertical
- Tank certification: ASME (USA-made)
- Dimensions (LxWxH): 34" x 26" x 70"
- Weight: 546 lbs
- Motor speed: 1725 RPM
- Motor service factor: 15% or higher
- Oil: CAST-LUBE synthetic, 4,000-hour / 1-year service interval
- Warranty: 2 years on air end, electric motor, and tank
Why Buy From Air Compressor Factory Direct?
- Castair specialists: Full lineup, full parts support — filters, oil, PM kits
- Free shipping to commercial addresses
- Free tech support: 866-217-0063 — we can confirm sizing and layout questions
- Full 2-year warranty on air end, motor, and tank
- Honest sizing guidance: If horizontal fits your shop better, we will tell you
Call 866-217-0063 for quick answers and help!
