Schulz Audaz 5 HP 80-Gallon Two-Stage Compressor, 230V 3-Phase

The one thing to settle before you read any further: this machine is 230V, 3-Phase. It is the three-phase member of the Audaz family, and three-phase is not something an electrician can conjure out of a single-phase panel — either the building has it at the meter or it does not. If your shop is on single-phase service, stop here and ask us for the single-phase equivalent instead; you will get the same 5 HP, the same 80-gallon tank and the same two-stage cast iron pump, wired for the supply you actually have.

If your building does have three-phase, this is usually the version you want. Three-phase motors draw less current per leg for the same output, so the feeder and the starter gear are smaller and cheaper for a given horsepower. They produce torque continuously rather than in pulses, which is easier on couplings and mountings. And they start under load without the starting components a large single-phase motor needs — which is one fewer thing on the machine that can fail.

Will it fit?

Allow 24" by 28" of floor and 67" of clear height, and treat those as the machine only — you need working air around the cooling shroud and reachable access to the drain and the gauges. The unit weighs 480 lb, which sets how it comes off the truck and how it gets across your floor.

The supply is 230V three-phase. We are not printing an amp draw or a breaker size, and that is on purpose: our specification sheet for this model gives neither, it says to consult a certified electrician. Sizing the circuit, the disconnect and the wire run is the buyer's responsibility. Have it done by a licensed electrician who has seen your panel and knows what else is on the service. One extra job for whoever wires it: on a three-phase motor the rotation direction depends on how the legs land, and a compressor pump turning backwards is both useless and damaging. Confirm rotation on first start.

Something our own data disagrees about

Our records do not agree on the tank orientation of this unit. The description text on this listing describes a horizontal tank, while our specification field records it as vertical — and the dimensions above, tall and narrow, look like a vertical machine. We are not going to pick one for you. If the footprint or the height decides whether this fits your space, contact us before ordering and we will confirm the orientation against stock. That is a question we can answer in a phone call, and it is not one you want answered by a delivery truck.

Two-stage compression, and what 175 PSI buys you

A two-stage pump compresses the air twice, in two different cylinders, with a transfer between them. Splitting the work means neither cylinder has to run at the temperatures a single-stage pump reaches to hit the same pressure, and heat is what kills compressor pumps. Rings, valves and bores all last longer when the machine is not running hot.

The rated ceiling is 175 PSI. Storage pressure matters more than most buyers expect: the higher the pressure the tank is charged to, the more usable air is packed into the same 80 gallons, and the longer you can work between pump cycles. It is the difference between a compressor that murmurs occasionally and one that runs almost continuously while a technician uses an impact gun.

Cast iron and direct coupling

The pump is solid cast iron. Cast iron sheds heat well and, more importantly, holds its dimensions as it heats and cools through thousands of cycles, so clearances stay where the factory set them.

The pump is coupled directly to the motor, with no belt, pulleys or flywheel. That removes the most common slow failure on a shop compressor — a belt that glazes and slips, losing you output for months before anything visibly breaks — along with the tensioning and alignment checks that belt drives require. It also makes the assembly shorter and tidier than a belt-driven machine of the same capacity.

Lubrication is an oil splash system. Our data records no oil sight glass and no low-oil shut-off, so the oil level is a manual check on a schedule; the machine will not warn you and will not stop itself.

Perfect for

• Commercial shops already on three-phase service, where the wiring cost of a 5 HP motor drops noticeably compared with single-phase.
• Fleet and municipal maintenance facilities, which almost always have three-phase available and run air tools most of the day.
• Light manufacturing and fabrication, where continuous torque and a smaller feeder matter as much as the air itself.
• Anyone standardising on three-phase equipment and not wanting a single-phase outlier on the panel.

What's in the box

The compressor as specified: two-stage cast iron pump direct coupled to the motor on the 80-gallon ASME tank, with the magnetic starter, pressure gauge and tank drain fitted. There is no aftercooler and no air dryer — both are recorded as not fitted — so if your process needs dry air, plan for a dryer as a separate purchase. Hose, fittings, filtration and the electrical installation are not included.

Specifications

No free-air delivery figure is published on this page. The value in our data for this configuration does not carry a verifiable unit alongside it, and a delivery rating quoted without the pressure it was measured at tells you nothing useful. Ask us and we will read it off the manufacturer's sheet.

Certification, stated plainly

Our data records ASME for this machine, the pressure-vessel code that applies to the receiver. That is the only certification we will claim, because it is the only one our product data claims. We are not implying any additional third-party safety listing for the unit as a whole — if a listing requirement is written into your insurance policy, your facility's compliance standard or your local code, which is common on commercial and municipal sites, ask us first and we will confirm exactly what is on the data plate before you commit.

Shipping and delivery

Freight only, lower 48 states, quoted live at checkout for your actual address rather than guessed at here. At 480 lb you need a forklift, a dock, or a terminal pickup you drive to yourself — the carrier's driver is not going to hand it down. Delivery to a residential address carries a residential fee, which appears at checkout before payment. Pickup is available at Acworth, GA.

Inspect before you sign. Damage goes on the delivery receipt in writing, at the time of delivery, with photographs taken while the truck is still there. A clean signature on the paperwork makes a later claim extremely difficult.

Warranty

Coverage is 1 year, consumer and commercial, on the manufacturer's stated terms. If you have a problem, do not strip the pump, motor, starter or pressure switch before the claim is opened — a machine that has been taken apart is normally treated as outside warranty, however sound the reasoning was. Call, text or chat with us on 866-774-7743 and we will tell you what the manufacturer needs first.