Castair I733HC1: 7 HP Three-Phase Industrial Air Compressor, Horizontal Tank
The Castair I733HC1 is a 7 horsepower, three-phase industrial reciprocating air compressor on a horizontal ASME tank, C1 pump configuration. This is the three-phase equivalent of the I713HC1 single-phase model — same HP class, same horizontal tank orientation, but with a three-phase motor that runs more efficiently and requires less current per phase than the single-phase version.
If your shop has three-phase power, the I733HC1 is the right choice over the I713HC1. Three-phase motors at 7 HP draw balanced current across all three phases, which means less voltage drop on your panel, cooler motor operation, and longer motor life compared to a single-phase unit of the same HP rating. For shops that already have three-phase service wired in, there is no reason to run single-phase at this power level.
Who This Compressor Is For
- Shops with three-phase electrical service that need a horizontal-mount industrial compressor
- Operations running one to two technicians with moderate-to-high air demand on three-phase power
- Facilities where the horizontal tank profile fits the available floor and ceiling layout
- Buyers who want a standalone starter installed separately rather than a factory-mounted version
Industrial Cast Iron Pump — C1 Configuration
- All cast iron construction: Cylinder, head, crankcase — not aluminum
- Slow pump RPM: C1 configuration — consistent with the industrial series range of 420 to 995 RPM
- Tapered roller bearings: At both ends of the crankshaft for superior load support and reduced friction
- Precision steel connecting rods: Automotive-type insert bearings at crankshaft and wrist pin
- Disc and spring valves: More serviceable and reliable than reed valves, designed for industrial duty
- 4-ring pistons: Four rings per piston for better compression efficiency and less oil carryover
- Centrifugal unloader: Starts unloaded every cycle — no cranking against full head pressure
Tank, Motor, and Controls
- Tank type: Horizontal ASME-rated tank with channel base, powder-coated
- Motor: 7 HP three-phase, 1725 RPM industrial motor, 15% service factor or higher
- Phase: Three-phase (3-phase)
- ASME safety valve: Factory installed
- Belt guard: Metal, totally enclosed
- Motor starter: Not factory-mounted — field-installed separately
I733HC1 vs. I713HC1: Three-Phase vs. Single-Phase
- I713HC1: 7 HP single-phase, 230V — for shops with only single-phase service available
- I733HC1 (this unit): 7 HP three-phase — more efficient motor, lower current per phase, longer motor life. Choose this if three-phase power is available.
The pump configuration, tank, and output specs are the same between the two. The motor and wiring requirements differ. If you are not sure which power type is wired in your shop, have your electrician check before ordering.
Technical Specifications
- Model: I733HC1
- Horsepower: 7 HP
- Phase: Three-phase (3-phase)
- Tank type: Horizontal (HC)
- Pump configuration: C1
- Motor starter: Not included — field-installed
- CFM, PSI, RPM, dimensions, weight: Manufacturer specifications pending — contact us at 866-217-0063 for confirmed data
Factory Options Available
- Low Oil Control (#6304M): Automatic shutdown on low oil
- Hour Meter (#HRM460M for 460V or #HRM75M for 230V three-phase): Runtime tracking
- Air Operated Auto Drain (#ADVSM): Automatic condensate drain
- Electronic Auto Drain (#SDV03M): Timer-based drain valve
- Dual Control (#DC1 for C1): Start/stop and constant speed modes
- Intake Noise Silencer (#SA100M for C1): Reduces pump inlet noise
- Vibration Pads (#VP1004): Four 4x4x1 inch isolation pads
- Right from the Start Kit (#RFS001 for C1): Startup accessories bundle
- Beltguard Aftercooler (#BGAC1M, 35 CFM): Moisture control — recommended for painting and blasting
Why Buy From Air Compressor Factory Direct?
We carry the full Castair industrial series across both single-phase and three-phase configurations. If you are deciding between the I713HC1 and I733HC1, call us — we can confirm your power service type matches the motor, verify the voltage configuration, and make sure you are getting the right starter specification for field installation. Free shipping on qualifying orders. Free tech support before and after the sale. Full manufacturer warranty on every Castair industrial unit.
Call 866-217-0063 for quick answers and help!
