The Castair Aftercooler Option Bundle AOC4 460V is the complete factory-installed options package for Cast Air C4-series simplex compressors on 460V three-phase power. The C4 is Cast Air's large industrial pump — a V4-configuration two-stage cast iron pump in the 20 to 30 HP range, producing approximately 72-93 CFM at 0 PSI and 72+ CFM at 175 PSI, running at 519 RPM in the 20 HP configuration. This is the compressor for high-volume industrial operations: multiple spray booths, heavy manufacturing, large commercial tire shops, and any facility where air demand runs 60-80 CFM or more during production hours.
The AOC4-460 bundle provides aftercooling, automatic drains, hour metering, dual control, intake silencing, and vibration isolation — all factory-installed and matched to C4 specifications. Bundle pricing saves 10% over individual option pricing.
What the AOC4 460V Bundle Includes
Aftercooler System
- Belt Guard Aftercooler (#BGAC3M): Factory-mounted, rated for 20 HP and up — the heavy-duty aftercooler in Cast Air's lineup, correctly matched to C4 output volumes. At 20-30 HP producing 70-93 CFM, the heat load on the aftercooler is substantial. The #BGAC3M handles it. Reduces compressed air from pump discharge temperature (often above 300°F) down toward ambient, removing approximately 65% of water vapor before air reaches your tank and distribution system. Max operating pressure 250 PSIG, max inlet temperature 350°F.
Automatic Drain System
- Air-Operated Auto Drain (#ADVSM): Automatic discharge-pressure-operated drain with installation kit. Purges condensate on each compressor cycle. On a C4-size system, the volume of condensate generated per hour is significant — automatic draining is not optional.
- Electronic Auto Drain (#SDV03M): 115V timer-controlled solenoid drain with inline strainer. Provides off-hours timed purge cycles. On a large-tank C4 installation (typically 240-gallon), overnight condensate accumulation is real — timed drains keep it managed.
Hour Meter
- Hour Meter (#HRM460M): 460V-rated elapsed time meter. At 20-30 HP, this compressor is a significant capital investment. Maintenance by hours run — not calendar time — is how you protect that investment. Oil changes, belt inspections, valve service, and unloader inspections all have hour-based intervals on the C4 pump family.
Dual Control
- Dual Control (#DC3): Selectable start/stop or constant-speed load/unload modes. On a 20-30 HP compressor, constant-speed unloading during production hours saves measurable energy and dramatically reduces stress on the motor and starter. A motor start on a 30 HP compressor draws 6-8x running current — minimizing starts extends motor and starter life significantly.
Intake Noise Silencer
- Intake Noise Silencer (#SA100M): Factory-mounted intake silencer for the C4 pump. At 519 RPM in the 20 HP configuration, the C4 runs slower than smaller pumps but moves significantly more air per stroke. The intake silencer addresses noise without flow restriction.
Vibration Management
- Vibration Pads (#VP1004): Set of four heavy rubber isolation pads. The C4 pump in the I20324HC4-S configuration weighs approximately 1,700 lbs total with tank — isolation pads are essential for protecting the floor, the tank connections, and all downstream piping from continuous vibration fatigue.
Right From Start Kit
- #RFS003: Cast Air startup kit for C4 pump family. Correct initial oil fill and break-in documentation. The C4 holds 1 gallon of oil and has specific startup procedures. Follow them — at this HP level, improper startup causes expensive damage.
Who Needs the AOC4-460 Bundle
This bundle is for facilities installing a Cast Air C4 simplex compressor on 460V three-phase service. The C4 at 20-30 HP is typically installed in: large auto body shops with multiple spray stations, manufacturing facilities with sustained pneumatic tool use, commercial tire shops with 10+ bays, and industrial operations where a smaller compressor simply cannot keep up with demand peaks.
460V three-phase service is required. If your facility is on 230V, contact Cast Air at (320) 796-0851 for the correct configuration — the C4 at this HP range is typically supplied as a 460V three-phase unit. Confirm your electrical service before ordering.
C4 vs. Stepping Down — Do You Actually Need the C4
- AOC3-460: C3 pump, 15 HP, approximately 50 CFM at 175 PSI. If your peak demand is consistently below 55 CFM, the C3 is the right size. A properly sized C3 running at 70-80% duty cycle is more efficient and more reliable than a C4 running at 30%.
- AOC4-460 (this product): C4 pump, 20-30 HP, approximately 72+ CFM at 175 PSI. The right call when the C3 is genuinely undersized for your operation.
- When to Contact Cast Air: If your peak demand approaches or exceeds the C4's rated output, Cast Air can configure multi-unit or duplex C4 systems. Call us first — we can help you calculate actual CFM requirements before you invest at this scale.
Technical Specifications
- Voltage: 460V, three-phase
- Compatible Compressor Family: Cast Air C4 simplex (20-30 HP)
- Aftercooler: #BGAC3M (factory-mounted, rated 20 HP+)
- Max Operating Pressure: 250 PSIG
- Max Inlet Air Temperature: 350°F
- C4 Pump CFM (reference, 20 HP): approximately 93 CFM at 0 PSI / 72 CFM at 175 PSI
- C4 Pump RPM (20 HP): 519
- C4 Pump Oil Capacity: 1 gallon
- Hour Meter: #HRM460M (460V)
- Auto Drain: Air-operated #ADVSM + Electronic #SDV03M (115V)
- Dual Control: #DC3
- Intake Silencer: #SA100M
- Vibration Pads: #VP1004 (set of 4)
- Startup Kit: #RFS003
- Bundle Savings: 10% off individual component pricing
What is in the Box
The AOC4-460 is a factory-installed option package. All components are factory-mounted and tested on your C4 compressor before shipment. At this scale, factory installation is not optional — proper mounting, connection, and testing of the aftercooler and drain system on a 20-30 HP unit requires the manufacturer's tooling and expertise. Contact us at 866-217-0063 or Cast Air at (320) 796-0851 for current pricing and lead times.
Why Buy From OEM Diagnostic Tools?
We have specialized in professional shop equipment since 2016. Free shipping, free pre-sale technical support at 866-217-0063, and full Cast Air manufacturer warranty. For a C4-scale purchase, call us before ordering — we will verify your CFM requirements, electrical service, and whether a C4 simplex or a stepped-up configuration makes sense for your facility.
Call 866-217-0063 for quick answers and help!
