{"product_id":"castair-d7124hc2-s","title":"Castair D7124HC2-S","description":"\u003cp\u003eThe Castair D7124HC2-S is a 15HP (2×7.5HP) single-phase duplex air compressor on a 240-gallon horizontal ASME tank with twin C2 cast iron pumps running at 585 RPM. This is the top configuration in Castair's single-phase 7.5HP duplex lineup: the largest tank, the heavier C2 pump, and the highest CFM output — 56.2 CFM at 175 PSI — in a machine that runs on standard single-phase electrical service.\u003c\/p\u003e\n\n\u003cp\u003eIf you are running a serious single-phase shop and you want the best combination of output, air storage, pump longevity, and backup redundancy that Castair builds in the 7.5HP class, this is that machine. The C2 pump moves more air per revolution than the C1 at the same horsepower by using a larger bore at a slower shaft speed. The result is more CFM, lower operating temperature, and a pump that handles high duty cycles more gracefully than a lighter, faster-spinning equivalent.\u003c\/p\u003e\n\n\u003ch2\u003eWho Needs the D7124HC2-S\u003c\/h2\u003e\n\u003cp\u003eAuto body shops, fleet maintenance operations, commercial tire centers, and industrial production facilities running single-phase power that need maximum sustained air output with genuine redundancy. At 56.2 CFM delivered at 175 PSI, this unit supports four or more technicians working simultaneously on air tools without significant pressure drop. The 240-gallon tank keeps cycle frequency low even during sustained peak demand.\u003c\/p\u003e\n\n\u003cp\u003eShops that run spray equipment, sandblasters, or other high-draw intermittent tools will particularly appreciate the 240-gallon reserve. The extra tank volume absorbs peak demand without immediately triggering the pumps, which reduces cycle frequency and heat accumulation in the pump internals over the course of a workday.\u003c\/p\u003e\n\n\u003ch2\u003eC2 Pump Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAll cast iron construction:\u003c\/strong\u003e Cylinders, crankcase, valve plates — cast iron throughout. Not aluminum. Cast iron is dimensionally stable under thermal cycling, quieter under load, and longer-lived in continuous duty applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSlow 585 RPM operating speed:\u003c\/strong\u003e The C2 achieves its output at 585 RPM by using a larger bore — not by spinning faster. Lower RPM equals lower operating temperature, lower wear rate, and longer maintenance intervals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLarger bore than C1:\u003c\/strong\u003e Same horsepower input, more air output. The C2 delivers 56.2 CFM versus the C1's 49.6 CFM at 175 PSI because it moves more volume per revolution at a slower speed. This is a more efficient use of the motor's power output.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTapered roller bearings:\u003c\/strong\u003e Both crankshaft ends run on tapered roller bearings — not ball bearings — for superior support under the combined radial and axial loads of reciprocating operation.\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 for long service life in continuous duty operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisc and spring valves:\u003c\/strong\u003e More durable and easier to service in the field than reed valves. Higher efficiency across the operating pressure range.\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 compressed air stream.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCentrifugal unloader:\u003c\/strong\u003e Every startup is unloaded — motor reaches speed before compression load engages, protecting both motor windings and pump internals at each startup cycle.\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 with channel base. ASME certified — constructed and tested to meet pressure vessel safety standards, not just labeled as such.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eASME safety valves:\u003c\/strong\u003e Certified pressure relief hardware, factory-original.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully enclosed metal belt guard:\u003c\/strong\u003e Safety compliance and protection for drive components.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCopper discharge and unloader tube or stainless-steel braided flex line:\u003c\/strong\u003e No plastic in the discharge path. Copper or stainless where heat and pressure demand it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy-duty 1725 RPM industrial motors:\u003c\/strong\u003e Full 15% service factor or higher. These motors are rated for continuous commercial industrial use.\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. You connect your power supply to the panel — the internal wiring is complete.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eDuplex Operation: The Logic Behind Two Pumps\u003c\/h2\u003e\n\u003cp\u003eA duplex compressor is two independent pump-and-motor assemblies sharing a common tank and control system. Each cycle, the control alternates which pump leads, distributing wear evenly over time. When pump A needs service — a valve, a belt, a motor bearing — pump B runs the shop. You schedule service on your timeline instead of the compressor's failure timeline.\u003c\/p\u003e\n\u003cp\u003eFor a shop billing 50\/hour per technician bay, an unexpected compressor shutdown costs real money in hours. The duplex architecture eliminates that exposure. It is not a redundant purchase — it is a risk management purchase.\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 Shuts down both units before oil starvation can score pump cylinders or wipe bearings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHour Meter (#HRM75x2M for 230V):\u003c\/strong\u003e Track actual operating hours per pump unit for interval-based maintenance scheduling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlternator (#ALT230M):\u003c\/strong\u003e Automatic cycle-by-cycle alternation between pump units to equalize long-term wear.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectronic Auto Drain (#SDV03M):\u003c\/strong\u003e Timed condensate purge. Tanks not drained daily accumulate moisture and corrode internally over time. This option automates that maintenance task.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual Control (#DC2x2M for C2 pumps):\u003c\/strong\u003e Enables continuous unloaded operation during sustained demand periods instead of cycling on and off repeatedly. Motor inrush at startup is 4 to 5 times running amperage. Reducing start frequency reduces electrical cost and motor stress proportionally.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntake Noise Silencers (#SA100x4M for C2 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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVibration Pads (#VP1004):\u003c\/strong\u003e Four isolation pads to reduce floor vibration 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 air temperature and moisture content before the compressed air enters the tank.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAll Options Bundle (#AOC2D):\u003c\/strong\u003e Order all asterisk options together for 10% off the options package total.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAvailable Configurations — 7.5HP Single-Phase Duplex\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eD7112HC1-S:\u003c\/strong\u003e 2×7.5HP, single-phase, C1 pump (895 RPM), 120-gal, 49.6 CFM@175 PSI, 1,240 lbs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eD7112HC2-S:\u003c\/strong\u003e 2×7.5HP, single-phase, C2 pump (585 RPM), 120-gal, 56.2 CFM@175 PSI, 1,430 lbs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eD7124HC1-S:\u003c\/strong\u003e 2×7.5HP, single-phase, C1 pump (895 RPM), 240-gal, 49.6 CFM@175 PSI, 2,140 lbs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eD7124HC2-S (this unit):\u003c\/strong\u003e 2×7.5HP, single-phase, C2 pump (585 RPM), 240-gal, 56.2 CFM@175 PSI, 1,780 lbs. — maximum output and storage in single-phase.\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 (D7124HC1-S):\u003c\/strong\u003e If 49.6 CFM at 175 PSI covers your typical tool load and you want to keep weight and cost lower, the C1 version on the 240-gallon tank gives you the same storage with a lighter pump and slightly lower CFM. Note that the C1 240-gallon unit actually weighs more (2,140 lbs.) than this C2 240-gallon unit (1,780 lbs.) because of frame differences.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThis unit (D7124HC2-S):\u003c\/strong\u003e Single-phase power, maximum CFM demand, need for redundancy, shop runs the compressor hard through the full workday. The definitive single-phase 7.5HP duplex configuration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStep up (three-phase or 10HP):\u003c\/strong\u003e If your facility has three-phase power, the D7324HC2-S delivers equivalent performance at lower single-phase amperage draw. If you need more than 56 CFM from a duplex, the next step is the 10HP duplex series.\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 D7124HC2-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 Single-phase\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePump Series:\u003c\/strong\u003e C2 (cast iron)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePump RPM:\u003c\/strong\u003e 585\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCFM @ 0 PSI:\u003c\/strong\u003e 70\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCFM @ 175 PSI:\u003c\/strong\u003e 56.2\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 1,780 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 lineup across every HP class, pump series, and tank configuration. Free shipping on all orders. Free tech support at 866-217-0063 — if you want help comparing single-phase amperage requirements for this unit versus the three-phase alternatives, or working out whether 56 CFM is the right number for your shop, call us. Full manufacturer warranty on all units. Honest guidance — if a different configuration better fits your shop, we will tell you before you order, not after.\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":53342541971669,"sku":"D7124HC2","price":20501.96,"currency_code":"USD","in_stock":true}],"url":"https:\/\/aircompressorfactorydirect.com\/products\/castair-d7124hc2-s","provider":"Air Compressor Factory Direct","version":"1.0","type":"link"}