Castair I718HC1-S: 7.5 HP Single-Phase Industrial Air Compressor, 80-Gallon Horizontal Tank
The Castair I718HC1-S is a 7.5 horsepower, single-phase industrial reciprocating air compressor mounted on an 80-gallon horizontal ASME tank with a factory-mounted aftercooler. This is the horizontal entry point in the 7.5 HP single-phase Castair industrial lineup — same HP and CFM output as the vertical 80-gallon models, but in a lower-profile horizontal configuration that fits shops with ceiling constraints or that prefer horizontal floor placement.
The C1 pump designation means this unit runs at 895 RPM. At 655 lbs and a 64x20x48 inch footprint, the I718HC1-S is the lightest and most compact horizontal unit in the 7.5 HP 1-phase lineup. The vertical equivalent (I718VC1-S) has a smaller floor footprint at 32x24 inches but stands 74 inches tall.
Who This Compressor Is For
- Shops on single-phase 230V power that need a horizontal-mount industrial compressor
- Installations where ceiling height is limited and vertical tank placement is not practical
- Shops with one to two technicians running air tools at moderate-to-high duty cycles
- Operations that want factory-installed aftercooler for moisture control without a separate installation job
- Buyers who want the smaller, lighter C1 pump configuration versus the heavier C2
Industrial Cast Iron Pump — C1 Configuration
- All cast iron construction: Cylinder, head, crankcase — no aluminum shortcuts
- Pump speed: 895 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: Easier to service and more reliable than reed valves under industrial load
- 4-ring pistons: Better sealing efficiency and less oil carryover
- Centrifugal unloader: Starts unloaded every time — reduces motor start current and pump stress
Tank, Motor, and Factory Aftercooler
- Tank capacity: 80 gallons, horizontal orientation
- Tank construction: Powder-coated ASME-rated horizontal tank with channel base
- Motor: 7.5 HP single-phase, 1725 RPM industrial motor with 15% service factor or higher
- Voltage: 230V single-phase
- ASME safety valve: Factory installed
- Belt guard: Metal, totally enclosed
- Aftercooler: Factory-mounted beltguard aftercooler (#BGAC1M, rated 35 CFM) — cools compressed air before tank entry, significantly reducing moisture in the air lines
Technical Specifications
- Model: I718HC1-S
- Horsepower: 7.5 HP
- Phase: Single-phase (1-phase)
- Voltage: 230V
- Tank capacity: 80 gallons
- Tank type: Horizontal (HC)
- Pump RPM: 895
- Free air delivery (CFM @ 0 PSI): 32.4 CFM
- Delivery at working pressure (CFM @ 175 PSI): 24.8 CFM
- Maximum working pressure: 175 PSI
- Dimensions (L x W x H): 64 x 20 x 48 inches
- Weight: 655 lbs
- Aftercooler: Factory-mounted beltguard aftercooler included
I718HC1-S vs. Other 7.5 HP Single-Phase Models
- I718VC1-S — Same HP, C1 pump, 895 RPM, 32.4 CFM — vertical tank, 32x24x74 in., 655 lbs. Same weight, smaller floor footprint, taller.
- I718HC1-S (this unit) — Same specs, horizontal tank, 64x20x48 in., 655 lbs. Choose for ceiling-limited shops.
- I718HC2-S — Same HP, C2 pump, 585 RPM, 35.0 CFM, 28.1 CFM @ 175 PSI, 64x20x46 in., 760 lbs. Heavier, quieter, more CFM.
- I7112HC2-S — Same HP, C2 pump, 120-gal horizontal tank, 69x24x50 in., 850 lbs. Maximum 1-phase tank capacity.
When Does a Shop Need This vs. Stepping Up or Down?
Choose the I718HC1-S if: You need a horizontal tank, single-phase power is your only option, and your shop runs one or two technicians with moderate air demand. The 24.8 CFM at 175 PSI covers most general automotive service work including tire service, impact wrenches, air ratchets, and occasional spray work.
Step up to the I718HC2-S if: Noise is a concern or you need the extra CFM headroom (28.1 vs. 24.8 at 175 PSI) that the C2 pump provides.
Step up to the 120-gallon if: You frequently experience pressure drops during busy periods and want more stored air volume to bridge the gap between cycles.
Factory Options Available
- Low Oil Control (#6304M): Automatic shutdown on low oil
- Hour Meter (#HRM75M): Tracks runtime for maintenance intervals
- Air Operated Auto Drain (#ADVSM): Automatic tank condensate drain
- Electronic Auto Drain (#SDV03M): Timer-based drain valve
- Dual Control (#DC1): Start/stop and constant speed modes
- Intake Noise Silencer (#SA100M): Reduces pump inlet noise
- Belt Tensioner (#215DM): Simplifies belt maintenance
- Vibration Pads (#VP1004): Four 4x4x1 inch isolation pads
- Right from the Start Kit (#RFS001): Startup accessories bundle
Why Buy From Air Compressor Factory Direct?
We are a specialty compressor supplier who carries the complete Castair industrial lineup. Call us and we will walk you through the C1 vs. C2 pump tradeoffs, confirm which tank configuration fits your shop, and make sure you are ordering the right options for your application. Free shipping on qualifying orders. Free pre- and post-sale tech support at 866-217-0063. Full manufacturer warranty on every Castair industrial unit.
Call 866-217-0063 for quick answers and help!
