How to Use the AUTOOL LM806 A/C Refrigerant Recovery Machine

The AUTOOL LM806 is an automotive refrigerant recovery and service machine. This guide turns the current model-specific controls and official operating sequence into a practical start-to-finish workflow.

Before you start

Work in a clean, well-lit and ventilated area. Stabilize the vehicle, keep rotating or hot components out of the work zone, and open the exact vehicle procedure for the system and test point you will use. A tool connection is not automatically safe just because an adapter fits.

• confirm that the model label reads AUTOOL LM806 and that the controls match this guide;
• inspect the housing, cables, clamps, hoses, fittings, seals and adapters for damage or contamination;
• identify the permitted connection point, test range, vehicle state and acceptance criteria before connecting;
• keep eye protection and the task-appropriate gloves within reach; and
• plan how you will return the vehicle circuit or line to its original sealed condition after the test.

Use the AUTOOL manual download center to locate the current instructions when a manual is available. The delivered model label and current vehicle service information control if an older image or remembered setting differs.

LM806 controls and specifications

The AUTOOL LM806’s key controls and functions include ：, ：, ：, ：, ：. Confirm each relevant control on the physical unit before use; related models can look similar while using different ranges, air sources or operating modes.

Specification or function	Current model
Power supply	AC 110V/220V
Operating temperature	5~50°℃
Vacuuming speed	6OL/min.
Compressor power	1/3HP
Applicable refrigerant type	R134a
Refrigerant electronic scale accuracy	±10g
Refrigerant electronic scale maximum load	40kg
Refrigerant storage tank capacity	12kg
Refrigerant oil electronic scale accuracy	±5g
Refrigerant oil electronic scale maximum load	5kg

Stay inside both limits: the tool’s rated range and the vehicle or component’s permitted test range. When they differ, the lower applicable limit is the boundary. Do not infer a missing gauge, adjustment, mode or protection feature from a higher model in the same series.

How to use the LM806

Step 1: Confirm LM806 commissioning and refrigerant compatibility

Use the exact LM806 data plate, delivered instructions and service records to confirm the machine is commissioned, its filter and refrigerant circuit are serviceable and it is configured for the refrigerant and oil class on the vehicle label. Never mix refrigerants or use contaminated recovery equipment on an electric compressor system requiring segregated oil.

Before moving on, pause and check the connection against the physical labels. A secure-looking connection can still be the wrong port, polarity, range or adapter.

Step 2: Inspect hoses, scale, tank path and ventilation

Check high- and low-side hoses, couplers, seals, valves, power lead, recovery container or internal tank status, oil containers and scale indication. Use eye and hand protection in a ventilated area, keep ignition sources away and stop for a damaged pressure part, unreadable weight or overdue filter or calibration status.

Step 3: Identify the vehicle service ports with the system off

Read the vehicle label and service information, remove only the correct port caps and inspect for leakage or damage. Route hoses clear of fans, belts and exhaust, keep machine valves closed and attach the matching high- and low-side couplers by port function rather than color alone.

Step 4: Enter the exact job and current quantities

Select the vehicle refrigerant and only the LM806 function needed for this job. Record the machine's starting refrigerant and oil-container status and enter a charge quantity only from authoritative vehicle information; do not use the amount recovered as an automatic replacement specification.

Step 5: Run recovery while monitoring pressure and weight

Open the couplers and start the labeled recovery cycle, keeping the bay controlled. Watch high and low pressure, recovered quantity, machine status and every hose. Stop for a leak, hose movement, abnormal noise, excessive container level or a machine warning rather than bypassing the protection.

Step 6: Allow stabilization and repeat only when prompted

After the first recovery stop, allow pressure to stabilize for the period required by the machine and vehicle procedure. If pressure rises again, run the permitted additional recovery stage; do not open the system while refrigerant pressure remains.

Step 7: Manage recovered oil and service components

Measure and handle recovered oil only through the LM806 procedure and the vehicle's oil-balancing requirements. Replace a receiver-drier, seal or failed component only through the vehicle repair procedure, keeping the open circuit capped against air and moisture.

Step 8: Evacuate and assess vacuum integrity

If the exact LM806 supports evacuation, set the required time from the repair procedure and run the cycle with secure couplers. Treat a failed hold test as a reason to inspect the system and service connections; vacuum hold is not a complete refrigerant leak test and must not be overridden to continue charging.

Step 9: Charge the specified mass and verify operation

Use only clean compatible refrigerant and the authoritative charge mass, confirm the scale is unobstructed and run the exact charging sequence. Then operate the climate-control system under the vehicle test conditions, check pressures, temperatures, vent performance and compressor or fan behavior, and investigate an abnormal result without adding refrigerant by guesswork.

Step 10: Close valves, recover hose contents and document

Use the machine's hose-clearing or recovery routine, close couplers and valves and confirm a safe pressure before disconnecting. Reinstall service-port caps, perform the required leak check, record recovered and charged mass plus oil action, and leave hoses capped and the LM806 ready for its maintenance schedule.

Do not end the job at the first plausible indication. Repeat or confirm the observation under the same controlled condition, then restore the vehicle connection and check for leakage, warnings or an abnormal response.

Read and verify the result

Compare the observation with known conditions, not with a single memorized number. Check whether the reading, indication or visible result is stable, repeatable and produced with the correct setup. If possible, compare a known-good point or repeat after correcting one controlled variable.

• A repeatable result at the correct connection is stronger evidence than a momentary spike or one brief indication.
• An out-of-range result can identify a direction for diagnosis, but it does not name the failed component by itself.
• A normal result at one test point does not clear every part of the system; follow the vehicle diagnostic tree.
• After a repair, repeat the same controlled test and complete the vehicle-specific functional check.

Common mistakes and care

• Refrigerant service requires trained personnel, ventilation, eye and hand protection and compliant recovery equipment.
• Identify refrigerant and charge mass from the vehicle label and service information; never mix refrigerants or charge by guesswork.
• Do not intentionally vent refrigerant, and safely manage refrigerant trapped in hoses before disconnection.
• Keep electric-compressor oil and service equipment segregated when the vehicle procedure requires it.
• Do not borrow a range, mode, connection order or interpretation rule from another model in the series.
• Do not disconnect a live electrical, pressure, vacuum or fluid connection; first return the tool and vehicle system to a safe state.
• After use, clean only as directed, keep ports capped, coil leads and hoses without sharp bends, and store the kit dry.

Frequently asked questions

Can I use the LM806 setup from a different AUTOOL model?

No. Similar housings and accessories do not prove identical ranges, controls, power requirements or connection methods. Match the exact model first.

Does one normal result prove the system is fault-free?

No. It proves only that the tested condition was within the chosen acceptance criteria at that moment. Continue the vehicle-specific diagnostic path when the symptom remains.

What should I do when the reading is unstable?

Stop and check power, connection security, sealing, range selection, test-point suitability and vehicle state. Repeat only after the cause of instability is understood.

Final LM806 checklist

• Exact model, permitted test point and test range confirmed
• Tool, leads, hoses, seals and adapters inspected
• Setup completed in the model-specific sequence
• Observation repeated or otherwise verified
• Vehicle connection restored with no leaks, loose terminals or open ports
• Tool shut down, cleaned and stored without trapped pressure or unsafe power

Used this way, the LM806 supports a disciplined diagnostic decision: prepare the correct test, control the setup, verify the observation and leave the vehicle in a known safe state.