{"product_id":"castair-d7324hc1-s","title":"Castair D7324HC1-S","description":"\u003cp\u003eThe Castair D7324HC1-S is a 15HP (2×7.5HP) three-phase duplex air compressor on a 240-gallon horizontal ASME tank with twin C1 cast iron pumps running at 895 RPM. This configuration is built for three-phase shops that need large air storage volume combined with duplex redundancy — shops where the compressor runs continuously through long workdays and where cycling frequency matters as much as raw output.\u003c\/p\u003e\n\n\u003cp\u003eAt 1,560 lbs. on a 240-gallon tank, this is a serious commercial installation. The three-phase motors deliver 49.6 CFM at 175 PSI while drawing lower amperage than single-phase equivalents of the same horsepower. The 240-gallon tank means your pumps cycle significantly less often under the same air demand compared to the 120-gallon version — which translates directly into lower pump temperatures, lower motor start frequency, and longer component life across the board.\u003c\/p\u003e\n\n\u003ch2\u003eWho Needs the D7324HC1-S\u003c\/h2\u003e\n\u003cp\u003eThree-phase commercial shops with sustained air demand and the floor space for a 240-gallon horizontal machine. Auto repair shops, fleet maintenance facilities, tire centers, and light manufacturing operations where multiple air tools run simultaneously through the workday. The duplex configuration provides backup redundancy — when one pump needs service, the other keeps the shop running.\u003c\/p\u003e\n\n\u003cp\u003eThe 240-gallon tank is particularly valuable for operations that run air-intensive equipment in bursts — sandblasters, plasma cutters, automated spray systems, or large impact tools. The larger reservoir absorbs those peak demand spikes without immediately cycling the pumps back on, which reduces heat cycles in the pump and motor assemblies over time.\u003c\/p\u003e\n\n\u003ch2\u003eCastair C1 Pump Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAll cast iron construction:\u003c\/strong\u003e Cylinders, crankcase, and valve plates are cast iron throughout. Cast iron handles sustained duty better than aluminum — it runs quieter, maintains tighter tolerances through thermal cycles, and lasts longer in continuous-duty commercial applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e895 RPM operating speed:\u003c\/strong\u003e The C1 pump runs at 895 RPM — roughly half the speed of most imported pump assemblies. Slower RPM means lower operating temperature and longer service life for bearings, rings, and valves.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTapered roller bearings:\u003c\/strong\u003e Both ends of each crankshaft use tapered roller bearings — the correct bearing type for the combined radial and axial loads in a reciprocating compressor crankshaft.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision steel connecting rods:\u003c\/strong\u003e Automotive-type rod insert bearings at the crankshaft journal and at the wrist pin. This is how long-life industrial reciprocating machines are built — not with pressed pins and loose-tolerance bores.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisc and spring valves:\u003c\/strong\u003e More durable and more efficient than reed valves under sustained duty. When valves wear, you service the valves — not the pump head.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ring pistons:\u003c\/strong\u003e Four compression rings per piston for better sealing efficiency and lower oil carry-over into the air supply. This matters for spray work and precision pneumatic tooling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCentrifugal unloader:\u003c\/strong\u003e Loadless start on every cycle. The pump reaches speed before compression load engages — less motor stress, longer motor life, especially important in high-cycle applications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eTank, Motor, and Control Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e240-gallon horizontal ASME tank:\u003c\/strong\u003e Powder-coated steel with channel base for floor stability. ASME certified — designed, constructed, and tested to meet pressure vessel safety standards.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eASME safety valves:\u003c\/strong\u003e Factory-original certified pressure relief hardware.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully enclosed metal belt guard:\u003c\/strong\u003e Safety compliance and drive system protection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCopper discharge and unloader tube or stainless-steel braided flex line:\u003c\/strong\u003e Copper or stainless in all discharge path connections — no plastic where heat and pressure are present.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy-duty 1725 RPM three-phase industrial motors:\u003c\/strong\u003e Full 15% service factor or higher. Three-phase motors start cleanly without capacitors or centrifugal switches, draw lower amperage per HP than single-phase, and run cooler under sustained loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMagnetic starter mounted and wired (-S models):\u003c\/strong\u003e Factory-installed and pre-wired magnetic motor starters. Connect your three-phase electrical service to the panel — the internal wiring is done.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003e240-Gallon Tank: The Operational Advantage\u003c\/h2\u003e\n\u003cp\u003eBoth the 120-gallon D7312HC1-S and the 240-gallon D7324HC1-S deliver 49.6 CFM at 175 PSI from the same C1 pumps. The difference is entirely about cycle management.\u003c\/p\u003e\n\u003cp\u003eA 240-gallon tank takes twice as long to drop from cut-out pressure to cut-in pressure under the same air draw rate as a 120-gallon tank. That means half as many pump starts per hour, half as many heat cycles per hour, and half as many motor inrush events per hour. Over a 10-hour workday, the difference between 30 and 15 pump starts is significant for long-term pump and motor health. If your shop runs the compressor hard all day, the 240-gallon tank pays back its extra cost in extended pump life.\u003c\/p\u003e\n\n\u003ch2\u003eFactory-Mounted Options Available\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow Oil Control (#6304x2M):\u003c\/strong\u003e Automatic shutdown before oil starvation can cause internal pump damage. Essential for high-duty or unattended operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHour Meter (#HRM75x2M for 230V, #HRM460x2M for 460V):\u003c\/strong\u003e Track actual operating hours for both pump units — the foundation of interval-based maintenance scheduling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlternator (#ALT230M or #ALT460M):\u003c\/strong\u003e Automatic cycle-by-cycle alternation between pump units to equalize long-term run hours and wear.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectronic Auto Drain (#SDV03M):\u003c\/strong\u003e Timed condensate purge. Tanks not drained regularly accumulate moisture and corrode internally. This automates that maintenance requirement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual Control (#DC1x2M for C1 duplex):\u003c\/strong\u003e Enables continuous unloaded operation mode during sustained high-demand periods. Reduces motor start frequency, which directly reduces electrical cost and motor wear. Note: Dual control is not recommended on units with alternators installed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntake Noise Silencers (#SA100x2M for C1 duplex):\u003c\/strong\u003e Inlet silencers on each pump head reduce intake noise without restricting airflow.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBelt Tensioner (#215Dx2M for 7.5-10HP):\u003c\/strong\u003e Spring-loaded belt tensioner for consistent drive geometry as belts stretch during break-in and normal use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRight From the Start Kit (#RFS001D for 10HP):\u003c\/strong\u003e Maintenance kit for first-service interval, consolidated in one package.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVibration Pads (#VP1004):\u003c\/strong\u003e Isolation pads to reduce floor vibration transmission from the unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBelt Guard Aftercooler (#BGAC1x2M, 70 CFM for 10-20HP units):\u003c\/strong\u003e Reduces compressed air temperature and moisture content before the air enters the tank — worthwhile for shops with moisture-sensitive applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAll Options Bundle (#AOC1D for C1):\u003c\/strong\u003e Order all asterisk options together for 10% off the options total.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAvailable Configurations — 7.5HP Three-Phase Duplex\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eD7312HC1-S:\u003c\/strong\u003e 2×7.5HP, three-phase, C1 pump (895 RPM), 120-gal, 49.6 CFM@175 PSI, 1,210 lbs. — same pumps, smaller tank, lower weight.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eD7312HC2-S:\u003c\/strong\u003e 2×7.5HP, three-phase, C2 pump (585 RPM), 120-gal, 56.2 CFM@175 PSI, 1,400 lbs. — higher CFM, heavier pump, 120-gal tank.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eD7324HC1-S (this unit):\u003c\/strong\u003e 2×7.5HP, three-phase, C1 pump (895 RPM), 240-gal, 49.6 CFM@175 PSI, 1,560 lbs. — same pump output, larger storage, longer pump life in high-use applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eD7324HC2-S:\u003c\/strong\u003e 2×7.5HP, three-phase, C2 pump (585 RPM), 240-gal, 56.2 CFM@175 PSI, 1,750 lbs. — maximum output and storage in three-phase 7.5HP duplex.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhen Does a Shop Need This vs. Stepping Up or Down\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStep down (D7312HC1-S, 120-gallon):\u003c\/strong\u003e If floor space is limited or your demand does not justify the larger storage volume, the 120-gallon C1 version delivers the same 49.6 CFM with more frequent cycling. Saves 350 lbs. and floor space.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThis unit (D7324HC1-S):\u003c\/strong\u003e Three-phase power, sustained daily demand, floor space for a 240-gallon unit, need for duplex redundancy. The right configuration for any three-phase shop that wants low cycle frequency and long pump life from a C1 pump setup.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStep up (C2 pump):\u003c\/strong\u003e If you need 56 CFM instead of 49.6 at 175 PSI, the D7324HC2-S uses the same 240-gallon tank with the C2 pump upgrade. Same frame, more CFM per cycle, heavier pump.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e D7324HC1-S\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfiguration:\u003c\/strong\u003e Duplex (2 pumps, 2 motors)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMotor:\u003c\/strong\u003e 2×7.5HP, 15HP total\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhase:\u003c\/strong\u003e Three-phase\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePump Series:\u003c\/strong\u003e C1 (cast iron)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePump RPM:\u003c\/strong\u003e 895\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCFM @ 0 PSI:\u003c\/strong\u003e 64.8\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCFM @ 175 PSI:\u003c\/strong\u003e 49.6\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTank:\u003c\/strong\u003e 240-gallon horizontal ASME\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions (L×W×H):\u003c\/strong\u003e 85 × 30 × 64 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1,560 lbs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMagnetic Starter:\u003c\/strong\u003e Included, factory-mounted and wired\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMax Pressure:\u003c\/strong\u003e 175 PSI\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Buy From Air Compressor Factory Direct?\u003c\/h3\u003e\n\u003cp\u003eWe have been selling and supporting professional-grade air compressors since 2016. We carry the full Castair duplex lineup in every configuration — both pump series, all tank sizes, single-phase and three-phase. Free shipping on all orders. Free tech support at 866-217-0063 — call before you order if you want help comparing pump series options, calculating whether your three-phase amperage service supports this unit, or working out the right tank size for your shop's demand profile. Full manufacturer warranty on all units. Honest guidance — we will tell you if a smaller or different configuration is the better fit for your situation.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCall 866-217-0063 for quick answers and help!\u003c\/strong\u003e\u003c\/p\u003e","brand":"Cast Air","offers":[{"title":"Default Title","offer_id":53342543151317,"sku":"D7324HC1","price":17475.94,"currency_code":"USD","in_stock":true}],"url":"https:\/\/aircompressorfactorydirect.com\/products\/castair-d7324hc1-s","provider":"Air Compressor Factory Direct","version":"1.0","type":"link"}