The Castair Aftercooler Option Bundle AOC1 is a complete, factory-configured aftercooler package for Castair compressor systems operating on 230-volt single-phase electrical service. Rather than sourcing an aftercooler, drain hardware, and accessories separately from different suppliers and hoping they integrate correctly, the AOC1 gives you a matched, factory-assembled package designed for clean installation on compatible Castair compressors. Everything is sized and specified by the manufacturer for the compressor it goes with — not approximated from a generic parts list.
An aftercooler is a heat exchanger installed in the compressor discharge line — between the pump outlet and the receiver tank. Compressed air leaves the pump at 250–350°F carrying a full load of water vapor. The aftercooler pulls that temperature down to within 15°F of ambient air temperature before the air enters the tank. At lower temperature, the air cannot hold that moisture in suspension — it condenses to liquid and drains out at the aftercooler, not inside your tank, your piping, or your tools. The AOC1 bundle delivers this capability as a factory-integrated package, not a field-improvised assembly.
What Moisture in Compressed Air Actually Costs You
It is worth being direct about what uncontrolled condensate does to a shop. Water in compressed air is not a minor inconvenience — it is a recurring equipment and productivity cost:
- Paint and body work: A single moisture contamination event in a spray gun during a clear coat application means rework — stripping, sanding, and respraying. The consumables cost alone on one bad job likely exceeds the cost of the aftercooler bundle
- Air tool life: Impact wrenches, air ratchets, die grinders, and sanders all have internal bearings and vanes that corrode when exposed to moisture-laden air continuously. Tools that should last a decade start failing in two or three years
- Refrigerated air dryers: Dryers are rated for inlet air temperatures near 70–100°F. When the tank is feeding them air at 120°F because there is no aftercooler, the dryer is working outside its rated conditions and cannot maintain rated moisture removal — you get wet air downstream even with a dryer in the system
- Tank and piping corrosion: Condensate sitting in the tank and low points of the piping system promotes rust and eventual structural failure
The AOC1 bundle addresses the root cause: temperature at the source. Everything downstream works better when the air arrives cool and partially dehumidified.
What Is Included in the AOC1 Bundle
The AOC1 is a factory options package — it includes the aftercooler and all factory-specified accessories for a complete installation on compatible Castair 230V single-phase compressors. Specific bundle contents are matched to your compressor model. Contact us to confirm the exact component list for your unit before ordering.
Factory bundle packages typically include:
- Aftercooler heat exchanger unit: Fan-cooled, rated 250 PSIG maximum working pressure, 350°F maximum inlet air temperature
- Cooling fan and motor assembly: 115V, 1-phase, 60 Hz — runs on standard shop power
- Condensate drain provisions: For capturing and removing the moisture extracted by the aftercooler
- All mounting and connection hardware: Factory-matched for the compressor the bundle is designed for
Optional upgrades available with the bundle: filter with automatic drain, temperature control valve #86816 for cold-climate installations.
Key Features
- 230V Single-Phase Configuration: Matched to 230-volt, single-phase compressor electrical service — verify your compressor nameplate voltage before ordering
- Factory-Matched Components: Sized and specified by Castair for the compressor model — not a generic aftercooler adapted to fit
- 250 PSIG Maximum Working Pressure: Handles the full operating pressure of all standard Castair compressor models
- 350°F Maximum Inlet Air Temperature: Accepts full pump discharge temperature without performance degradation
- Cools to Within 15°F of Ambient: Dramatically reduces compressed air temperature before the receiver tank
- 65% Total Moisture Removal: Removes approximately 65% of water vapor at the aftercooler — every 20-degree temperature drop removes 50% of remaining moisture
- Complete Package Ordering: One part number covers the complete aftercooler installation — reduces ordering complexity and ensures component compatibility
- Simplex Compressor Configuration: Sized for single-compressor (simplex) installations — for duplex systems, see AOC1D
AOC Bundle Configurations — Choose the Right Version
Castair offers this aftercooler option bundle in configurations matched to electrical service and compressor setup. Ordering the wrong voltage version will not work safely — always match to your compressor nameplate:
- AOC1: 230V, single-phase, simplex (single compressor) (this bundle)
- AOC1-460: 460V, three-phase, simplex — for industrial facilities on three-phase service
- AOC1D: 230V, single-phase, duplex — for two-compressor installations on single-phase service
Full Castair Free Standing Aftercooler Lineup (For Reference)
If you are considering a standalone aftercooler rather than the factory bundle, the Castair free standing series covers 35–300 CFM:
- FSAC35: 35 CFM, 3/4 inch NPT
- FSAC50: 50 CFM, 1 inch NPT
- FSAC75: 75 CFM, 1 inch NPT
- FSAC100: 100 CFM, 1-1/4 inch NPT
- AC120: 120 CFM, 1-1/2 inch NPT
- AC150: 150 CFM, 1-1/2 inch NPT
- AC240: 240 CFM, 2 inch NPT
- AC300: 300 CFM, 2 inch NPT
When Does a Shop Need the AOC1?
The AOC1 bundle is the right choice when:
- You are ordering a new Castair compressor on 230V single-phase service and want the aftercooler specified and installed at the factory rather than sourcing components separately
- You are retrofitting aftercooler capability to an existing Castair 230V simplex installation and want factory-matched parts rather than field-improvised assembly
- Your shop runs a spray booth and moisture in the air line is a known problem — aftercooling is the first and most effective fix
- Your refrigerated dryer is not keeping up — adding an aftercooler upstream is often the solution when the dryer is receiving air hotter than its rated inlet condition
- You are replacing an aftercooler on an existing Castair installation and need factory-matched replacement components
If your compressor runs on 460V three-phase service, order AOC1-460. If you have a duplex (two-compressor) system, order AOC1D.
Technical Specifications
- Model: AOC1
- Manufacturer: Castair (Cast Air) — Minnesota, USA
- Bundle Type: Complete factory aftercooler options package
- Voltage: 230V
- Phase: Single-phase
- Compressor Configuration: Simplex (single compressor)
- Maximum Working Pressure: 250 PSIG
- Maximum Inlet Air Temperature: 350°F
- Approach Temperature: Within 15°F of ambient
- Water Removal: Approximately 65% of total moisture (at 250°F inlet)
- Fan Power: 115V, 1-phase, 60 Hz
- Category: Accessories — Aftercoolers
- Compatibility: Contact us to confirm matched compressor models
Why Buy From Air Compressor Factory Direct?
Air Compressor Factory Direct has specialized in commercial and industrial compressed air equipment since 2016. We carry the complete Castair product line — compressors, aftercoolers, dryers, and accessories — and we know how the components fit together. When you call about the AOC1, we can confirm which Castair compressor models it is designed for, verify your electrical service matches, and walk through installation requirements before you order.
- Free Shipping: AOC1 bundles ship free to the continental US
- Free Pre-Sale Technical Support: Call us with your compressor model and we will confirm the right bundle version before you order
- Full Manufacturer Warranty: All Castair equipment and factory options packages carry full manufacturer warranty
- Honest Guidance: If you need the AOC1D for a duplex system or the AOC1-460 for three-phase service, we will tell you upfront — ordering the wrong voltage or configuration is a problem we would rather catch before the unit ships
- Castair Specialist: We know this product line and stock it
Call 866-217-0063 for quick answers and help!
