Description

Atlas Copco OAH 2, OAV 4 2010 Installation Manual

You are staring at a compressor installation that’s about to go wrong because the guy before you guessed the discharge pipe routing. I’ve seen it a hundred times. Compressors are not cars, but the same rule applies: skip the OEM documentation and you’re asking for an oil leak or a fire hazard. This is a 34-page Atlas Copco OAH 2, OAV 4 2010 Installation Manual – factory issued, not a reprint from some third-party site that copied diagrams wrong. If you are responsible for putting one of these portable compressors into service, this is the document you need on the bench, not a PDF you found on a forum.

Safety Precautions: Why This Manual Starts with 1.7 Subsections

Chapter 1 runs from general safety through transport, installation, operation, maintenance, tool applications, and specific precautions. Each subsection is a separate check you need to verify before applying power. On page 4, the manual states that any damage from unauthorized parts or modifications voids the warranty and product liability. That’s not a suggestion; it’s a legal boundary. Page 5 starts the safety precautions with seven numbered sections. If you think you can skip reading the safety chapter because ‘it’s just a compressor,’ you haven’t seen what happens when a discharge line fails at 150 PSI. The OEM wrote this to keep you alive and keep the machine running. Follow it.

Connection Pipes: Discharge and Drain Specs (Chapter 4)

Chapter 4 covers the pipes between the OEM compressor module and your customer’s application. Section 4.1 handles the discharge pipe – material, routing, support requirements. Section 4.2 covers drain connections, which are the number one cause of water-in-oil complaints when installed wrong. The manual tells you exactly where to put the drain valves and what thread specs to use. Do not trust an aftermarket diagram for this; Atlas Copco dimensional data is precise to the millimeter. If you need to match it to an existing system, you use the factory numbers, not a guess.

Electrical System and Shut-Down Switches (Chapter 6)

Chapter 6 includes a reference to Figure 2 for the electrical system and shut-down switches. This is not your standard automotive relay logic. Portable compressors use pressure switches, temperature sensors, and emergency stops wired in a specific sequence. The manual provides the schematic and the wire color codes. Without this, you could bypass a safety interlock and create a runaway condition. I have seen a compressor overspeed because someone jumpered the high-pressure cut-out. That’s the kind of mistake that sends parts through the canopy. Factory documentation prevents that.

Compressor Drive: What Chapter 7 Tells You (and Doesn’t)

Chapter 7 is a single entry – ‘Compressor drive.’ It references the drive coupling and alignment procedure. The manual does not reinvent the wheel, but it tells you the correct method for aligning the pump to the engine or motor. If you are mating a new compressor to an existing power unit, you need this section. Misalignment kills bearings in 50 hours. The manual also references the operating manual of the driving mechanism – it says that on page 5. You keep both documents together. Instruction Manual Portable Compressors XRY/XRXS/XRVS is a related manual that covers the driver side if you need deeper detail on the engine controls.

Dimensional Drawings: Clearance Requirements (Chapter 8)

Eight separate drawings cover OAH 2 and OAV 4, with and without canopy. If you are installing these units inside a container, on a trailer, or in a tight mechanical room, you need the overall dimensions, service clearance, and lifting points. Section 8.1 through 8.4 give you the numbers. One common mistake is forgetting to leave room for the canopy door swing – those drawings show the envelope. Measure twice, cut once, and use the factory drawing.

Installation Review Checklist (Chapter 9)

Chapter 9 is titled ‘Installation review.’ This is a step-by-step checklist that you run through after you’ve connected everything. It covers fluid levels, belt tension (if applicable), electrical continuity, and safety device function. You do not skip this. In my shop, we staple the signed checklist to the inside of the canopy door. It covers your liability and it covers the customer’s equipment. The manual ends with a maintenance log (Chapter 11) and disposal guidelines (Chapter 10) for when the machine eventually gets retired. Nothing is left to guesswork.

What is the difference between the OAH 2 and OAV 4 models in this manual?

The OAH 2 and OAV 4 are different displacement compressor modules. The manual covers both with separate dimensional drawings and specific piping recommendations. Both share the same safety and electrical sections. If you have an OAH 2, use the drawings in 8.1 or 8.2. For OAV 4, use 8.3 or 8.4. The installation procedure and torque values for connection pipes are identical.

Does this manual include torque specifications for pipe fittings?

Yes. Section 4.1 and 4.2 list the required torque for discharge pipe flanges and drain connections. You need to look them up in the manual; I’m not going to repeat them here because misreading a number can cause a leak. The manual is 34 pages for a reason – every spec is in there.

Other manuals in the same family that cover related Atlas Copco portable compressors include Atlas Copco ORV 10 12 ORX 10 12 Installation Review and Atlas Copco Portable Compressors Instruction Manual. For general background on industrial power transmission, you might reference Manual Transmission, but that’s about automotive geartrains – not directly applicable to these compressors. Manual Transmission is another external source if you need a primer on shaft coupling principles. Stick with the factory manual for your OAH 2 or OAV 4. Do not print out a generic compressor guide and call it good.

You’ve seen what happens when installation is done off a memory sketch. Counterfeit specs cost you time, parts, and customer trust. This is the original 2010 Atlas Copco publication – scanned from a genuine paper copy, no watermarks, no third-party alterations. Access the Factory Manual and keep it in your tablet or a binder near the compressor. Your future self, and the guy who has to service it next year, will thank you.