Cast Air T25324HC2 Heavy Duty Shop Tandem Air Compressor — 25 HP, 230V/460V Dual-Voltage, Horizontal Commercial Tank, No Starter Included
The Cast Air T25324HC2 is a 25 HP tandem air compressor with dual-voltage capability — the 230V/460V configuration of Cast Air's 25 HP tandem line, sold without a motor starter. This unit is designed for facilities that have a preferred starter supplier, are integrating this compressor into an existing control panel, or are purchasing for an installation where the electrical contractor will be supplying and sizing the starter separately. At $9,825.75, it occupies a practical middle position in the 25 HP tandem range between the single-voltage starter-included HC2-S and the 3-phase large-tank HC3-S.
Note: Manufacturer specifications for this model are pending — contact us at 866-217-0063 for confirmed CFM output, tank capacity, dimensions, and wiring requirements before ordering. We will verify current specs directly with Cast Air on your behalf.
Important: No Starter Included — Read Before Ordering
Unlike the -S variants in Cast Air's lineup, the T25324HC2 does not ship with a motor starter. At 25 HP, a properly rated starter is mandatory — not optional — for safe and code-compliant operation. If you are ordering this unit, you need one of the following plans in place before it arrives:
- Your electrician is supplying and installing a starter: Provide them with the motor HP, voltage, and phase specifications so they can source the correct unit. A correctly rated starter for 25 HP applications typically costs $800–$1,500 purchased separately.
- You have an existing starter that is being repurposed or relocated: Verify the existing starter is correctly rated for 25 HP at your operating voltage before proceeding.
- You are integrating into a motor control center (MCC): Common in industrial installations where multiple motors are controlled from a central panel. In this case, the MCC handles motor protection and the compressor ships without a discrete starter.
If you need the starter included, look at the T25312HC2-S (230V single-phase, starter included, $8,292.35) or T25312HC3-S (230V 3-phase, large tank, starter included, $10,923.95). Call us and we will help you sort out which configuration is right for your installation.
What Is a Tandem Compressor?
A tandem compressor uses two independent pump assemblies on a shared air receiver. At 25 HP total, the dual-pump design delivers:
- Higher combined CFM than a single 25 HP pump — Two pumps filling the tank simultaneously produce more usable air per minute at real-world shop pressures than a single pump of equivalent rating.
- Faster pressure recovery — Under peak demand from multiple simultaneous air tool users, two pumps restore tank pressure faster than one, reducing wait time and keeping production moving.
- Lower per-pump thermal load — Each pump handles half the compression work. Cooler operation extends pump life and maintenance intervals significantly in continuous-duty applications.
- Operational continuity — If one pump requires maintenance, the other continues supplying air at reduced capacity. Your shop is not completely down while waiting on parts or a technician.
Who Is the T25324HC2 For?
This specific configuration — dual-voltage, no starter included — is for:
- Industrial and commercial facilities where the electrical contractor is responsible for motor starter specification and installation as part of a larger electrical project
- Motor control center (MCC) installations where motor protection is handled centrally and individual motor starters are not installed at the equipment level
- Facilities planning a 230V to 460V voltage upgrade where buying a dual-voltage motor now preserves future flexibility without paying the premium of a starter-included 460V model
- Operations that already have a properly rated starter on hand from a previous compressor installation and want to reuse it
- Large production shops running 6–10+ bays with continuous simultaneous air tool use across multiple workstations
- Fabrication, manufacturing, and heavy commercial service facilities where 25 HP tandem air volume is required to keep production tooling running without interruption
Dual-Voltage Configuration — 230V/460V
- Voltage: 230V or 460V dual-voltage capable (the "24" in the model number)
- Phase: Two-stage pump configuration (HC2 designation)
- 460V advantage at 25 HP: Running a 25 HP motor at 460V rather than 230V cuts the amperage draw approximately in half. At 25 HP, this is a significant difference — lower amperage means smaller wire gauge, smaller breaker, and lower installation cost. If your facility has 460V service available, wire this unit for 460V.
- Wiring: Dual-voltage motors must be correctly configured for the supply voltage at installation. This is a wiring procedure your electrician handles — it is not field-switchable without rewiring. Confirm the target voltage before installation begins.
- Starter not included: You must provide and install a correctly rated starter. See the starter notes above.
Two-Stage Pump Design (HC2 Designation)
- First stage compresses ambient air to intermediate pressure
- Intercooling reduces air temperature and moisture content before the second stage
- Second stage brings cooled air to final tank pressure
- Two-stage compression is more thermally efficient at high pressures, produces drier air, and extends pump component life compared to single-stage compression at the same operating pressure
- The correct choice for high-PSI commercial applications including spray painting, large impact tools, and air-powered production equipment
25 HP Tandem — Application Sizing
Twenty-five HP in a tandem configuration is for production-volume shops:
- Automotive body and repair shops running 6–10 bays with simultaneous spray booths, DA tools, body hammers, and blow-off equipment
- Heavy truck service operations running large air-operated jacks, heavy-duty impact guns, air suspension tools, and inflation equipment across multiple bays simultaneously
- Sandblasting operations where sustained blast pressure and volume are essential to production throughput
- Industrial manufacturing where pneumatic assembly tooling or automation operates continuously across production shifts
- Any facility where a 20 HP unit runs continuously and still cannot keep up with peak simultaneous demand
Cast Air T-Series Tandem Lineup — Where This Model Fits
- T10324HC1-S — 10 HP Tandem, 230V/460V, Starter Included — $7,194.15
- T15312HC2-S — 15 HP Tandem, 230V, Starter Included — $7,638.70
- T15324HC1-S — 15 HP Tandem, 230V/460V, Starter Included — $8,120.65
- T20324HC2-S — 20 HP Tandem, 230V/460V, Starter Included — $9,460.25
- T20324HC3-S — 20 HP Tandem, 230V/460V 3-Phase, Large Tank, Starter Included — $11,609.90
- T25312HC2-S — 25 HP Tandem, 230V, Starter Included — $8,292.35
- T25312HC3-S — 25 HP Tandem, 230V 3-Phase, Large Tank, Starter Included — $10,923.95
- T25324HC2 — 25 HP Tandem, 230V/460V, No Starter — $9,825.75 (this unit)
- T30312HC3-S — 30 HP Tandem, 230V 3-Phase, Large Tank, Starter Included — $11,729.75
When Does a Shop Need This vs. Stepping Up or Down?
- This unit is right for you if you need 25 HP tandem output with dual-voltage capability and your installation already has a motor starter plan in place — either through your electrician, an existing starter, or a motor control center.
- Choose T25312HC2-S instead if you want the starter included and will operate on 230V single-phase — save on installation complexity and get the starter bundled.
- Choose T25312HC3-S instead if your facility has 3-phase power available and you want the starter included — 3-phase at 25 HP is more efficient and the larger tank adds reserve capacity.
- Step down to 20 HP if your shop runs 5–7 bays with moderate simultaneous tool use — the T20324HC2-S handles that load for $365 less and includes a starter.
- Step up to T30312HC3-S if your facility has 3-phase power and your peak air demand routinely runs a 25 HP unit at its limits.
Why Buy From OEM Diagnostic Tools?
- Specialist since 2016 — We work with production shops, industrial operations, and heavy commercial service centers. We understand the difference between a spec sheet number and what a machine actually delivers under production load.
- Free shipping on this unit to commercial addresses in the contiguous US.
- Free tech support — Call 866-217-0063 before ordering. We will confirm your electrical requirements, help you determine the correct starter specification for your installation, verify current Cast Air specs on this model, and make sure this is the right unit before you commit.
- Full manufacturer warranty — Cast Air commercial compressor warranty, fully honored. We handle claims without complication.
- Honest answers — If you need the -S (starter-included) version or a different HP rating, we will tell you before you order, not after.
Call 866-217-0063 for quick answers and help!
