Quincy 4152026525 QGS 20 HP 132 Gallon Rotary Screw Air Compressor

We list two Quincy QGS packages built around a 20 HP motor and a 132 gallon horizontal receiver. They look almost identical on a spec sheet. The difference that matters is under the panels: this one drives the airend through gears, the other through belts. If you have been comparing part numbers and could not work out why there are two, that is why.

A gear-driven transmission takes power from the motor into the screw element through hardened teeth turning in the compressor's own lubricant. Nothing is tensioned, nothing stretches, and nothing gradually slips as it ages. The maintenance schedule loses an item permanently, and so does the failure list — a slack belt does not announce itself, it just quietly turns some of your electricity into heat instead of air. On a machine designed for continuous running, removing a wear item that degrades invisibly is worth more than it costs.

The belt-driven sibling is not a worse machine; belts are cheap, tolerant and easy to source. But if your preference is the shortest possible list of things to check, this is the part number to write down.

The one thing in this product's data we cannot reconcile

The manufacturer's feature list for this compressor names an "Integrated Refrigerant Air Dryer", and the description that has run on this page describes one working. The product's own specification table records the Air Dryer field as "No".

We are not going to pick whichever reading suits the sale. If a built-in dryer is part of what you are buying, ask us and we will check the configuration against the current factory order sheet before your order is placed. Worth knowing either way: the specification table does confirm an aftercooler is fitted. That drops the air temperature as it leaves the airend and removes the bulk moisture, but it does not reach the dewpoint a refrigerated dryer does, so it is not a quiet substitute for one.

Built to run, not to rest

The duty cycle is 100%. That single figure is the reason shops move from reciprocating compressors to rotary screws: a piston machine wants to run, stop and cool, and punishing it with a full day of demand shortens its life. The oil-injected twin screw element here is designed to be loaded continuously, sealed and cooled by the same premium synthetic lubricant that lubricates it — rated for 8,000 hours, so the service interval is measured in seasons rather than weeks.

Protection around it is sensible rather than exotic. The motor is TEFC with IP 55 wash-down rating, so shop dust and damp are designed for. Wye-Delta reduced-voltage starting keeps the inrush off your supply, which your building will appreciate more than you notice. Low-oil shutdown covers both engine and pump, there is an oil sight glass for the check you do without thinking, and the fluid filter is a spin-on.

The controller, and what it lets you do later

The Infologic2 Basic microprocessor controller handles programmable auto-restart and remote start and stop, and its display reports pressure, temperature, dewpoint and motor start limits rather than making you infer them. It also supports sequencing a group of QGS machines across the 20 HP to 30 HP range — up to six units — which means this compressor can later become part of a managed set instead of a second machine fighting the first for the same header pressure. That is a decision you make once, at purchase, and it is much cheaper to make correctly the first time.

Will it fit, and can you feed it?

The complete package is 74 inches long, 30.7 inches wide and 72.2 inches tall, and weighs 1,184 lbs. Height is usually the constraint rather than area, so check doorways and any overhead pipe or duct on the route in. Leave clearance at the hinged doors and detachable panels; service access designed in at the factory is no use if it is against a wall. The receiver outlet is 1 inch and that is where your header should be sized from.

Power first, though. This is a 208-230/460V 3-phase machine with a magnetic starter included. Quincy does not publish an amp draw or a recommended breaker for it — both entries read "Consult Certified Electrician" — and we will not put a figure of our own in their place. Get a licensed electrician to size the service, feeder and disconnect against the nameplate before delivery. Supply, siting and permits remain the customer's responsibility.

Perfect for

Automotive and truck shops running several air tools through a full day. Fabrication and light production work needing steady pressure rather than bursts. Operators who intend to keep a compressor for a decade and want the shortest maintenance routine available in the range. Being three-phase, it is not an option for a single-phase building without service work.

Specifications

Two numbers are missing from that table on purpose. This product's data holds a free-air-delivery value and a sound-level value with no unit attached to either, and a bare number is not a specification. We would rather leave a gap than publish a figure we cannot defend — ask us and we will read both from the current Quincy datasheet.

What's included

Taken from the manufacturer's feature list and specification table: the gear-driven QGS rotary screw compressor, Infologic2 Basic Controller with display panel, TEFC motor with IP 55 wash-down protection, 132 gallon horizontal receiver, aftercooler, air filter, pressure gauge, oil sight glass, magnetic starter, low-oil shutdown on engine and pump, and a spin-on fluid filter. An electronic drain valve is listed as not fitted, so tank draining is a manual routine unless you add one. The refrigerant dryer is the disputed item covered above.

Shipping and delivery

Shipped as freight to the lower 48 states, with the cost quoted live at checkout against your delivery address. We do not print a shipping price on the page because freight rates move and a stale figure turns into a dispute. Practically: this is a crate weighing more than half a ton and standing over six feet, so the unload has to be arranged in advance — a dock, a suitably rated forklift, or terminal pickup. A residential delivery address carries a residential fee. Look the shipment over before signing for it, and write anything you find on the bill of lading; signing clean is taken as agreement that it arrived in good order.

Warranty

Recorded cover is 1 Year consumer and 1 Year commercial. An extended 3 Year factory warranty is available for purchase, and the True Blue 5-Year warranty applies where the machine is commissioned by a Quincy authorized start-up. Treat that start-up as part of the installation cost, not an upsell, because the longer cover depends on it. If a fault does appear, shut down and call us before anything is opened — a compressor that has already been dismantled is a far weaker warranty claim.