Refrigerant Recovery and Recharge Machine

Overview

A refrigerant recovery and recharge machine is a dedicated car air-con servicing unit that integrates recovery, recycling, vacuuming, recharging, and leak detection into a single system. Its core value lies in its ability to reclaim used refrigerant from the air-con lines into its internal storage tank during servicing, purifying it through filtration before recharging it back into the system. This prevents direct venting into the atmosphere—protecting the ozone layer—while reducing repair costs.

With the global phase-out of fluorinated refrigerants (such as R12) and stricter environmental regulations, refrigerant recovery and recharge machines have become standard workshop equipment for automotive air-con maintenance. Equipped with microcomputer controls and high-precision sensors, the machine transforms traditional manual practices into an automated, precise standard operating procedure, significantly reducing human error.

Structure and Working Principle

A refrigerant recovery and recharge machine comprises essential components including a compressor system, storage tank, electronic weighing scale, oil separation and filter-drier system, vacuum pump, and a computerised control panel.

Its core operation is divided into three key steps:

Recovery and Recycling: Once connected to the high- and low-pressure service ports of the car's air-con system, the compressor recovers the refrigerant. The extracted gas-liquid mixture first enters the oil separator, which extracts and drains the mixed compressor oil; it then flows through the filter drier to remove moisture and contaminants, before the purified liquid refrigerant is safely stored in the machine’s internal storage tank for reuse.

Vacuuming: Following recovery, the built-in vacuum pump evacuates the air-con piping to eliminate air and residual moisture—a critical step to ensure refrigerant purity and optimal cooling performance during subsequent refilling.

Quantitative Recharging: The onboard electronic scale precisely monitors the weight of the refrigerant in the storage tank. Once the technician inputs the target charge on the control panel, the machine automatically dispenses the exact amount of liquid refrigerant into the air-con system, while simultaneously injecting the preset volume of compressor oil.

Key Features and Technical Specifications

Modern refrigerant recovery and recharge machines offer comprehensive, all-in-one functionality. Beyond basic recovery and recharging, they typically feature system leak testing (evaluating sealing integrity via pressure-hold tests), vacuuming, and automatic compressor oil replenishment.

For standard automotive workshop units, typical specifications include compatibility with R134a and the eco-friendly R1234yf refrigerants, with integrated electronic scales delivering an accuracy of ±10 g. Recovery rates typically average around 180 g/min, while recharge rates can reach up to 800 g/min, significantly speeding up workshop turnaround times.

Notably, heavy-duty industrial units designed for commercial vehicles or large bus air-con systems (such as the CM580 series) utilise multi-stage or high-output oil-free compressors, achieving substantially higher recovery rates. Furthermore, with the emergence of eco-friendly refrigerants like carbon dioxide (R744), dedicated high-pressure recovery and recharging stations featuring heavy-duty hoses and reinforced seals are now available to meet high-pressure operating requirements.

Operating Procedures and Safety Guidelines

Adhering to proper operating procedures is crucial to ensure equipment safety and quality air-con servicing:

1. Connect Hoses: Connect the machine's high-pressure (red) and low-pressure (blue) hoses to the respective service ports on the vehicle's air-con system.

2. Initiate Recovery: Verify valve positions and start the recovery cycle. The machine will automatically draw refrigerant into the storage tank until the manifold gauges read zero or the recovery completion indicator lights up.

3. Vacuum and Leak Check: Close the recovery valves and run the vacuum pump to evacuate the system. Once the required vacuum level is achieved, perform a hold test; any rise in pressure indicates a leak that must be rectified before proceeding.

4. Recharge to Specification: Input the factory refrigerant capacity as specified on the vehicle’s under-bonnet sticker or in the service manual. The machine will automatically dispense the precise charge.

Safety Precautions: Never point high-pressure hoses at anyone, and ensure the machine is properly grounded to prevent static discharge. The unit is equipped with automatic cut-off and alarm features when the storage tank reaches its 80% maximum fill capacity or if excessive system pressure is detected; technicians must adhere strictly to operating guidelines and avoid exceeding safety thresholds. As of July 2026, refrigerant recovery and recharge machines remain an indispensable asset for automotive workshops aiming to achieve environmental compliance and standardise air-con servicing, ensuring consistent repair quality through automation and precision metering.