Automatic Refrigerant Charging System Digital Pressure Weight Vacuum Display 0.5% Accuracy

Operators should not have to guess what the machine is doing. This charging system keeps pressure, charged weight and vacuum level on one digital panel throughout the whole cycle, so any deviation is visible while the charge is still running rather than after the unit has been closed. Charging accuracy is held at 0.5 percent of the set value across the full range.

The station runs evacuation, holding, charging and verification as one automatic sequence. A recipe is selected for the unit model, the cycle button is pressed, and the machine repeats exactly the same procedure for every unit. That removes the operator-to-operator variation that normally causes overcharge, undercharge and the warranty claims that follow them. Every cycle is logged with weight, pressure, vacuum and result, and the log can be read out through RS485 or exported to a USB stick for production traceability.

Although it is a charging station, the instrument package makes it a process checker as well. The following values are measured continuously during each cycle, not only at the end of it:

The controller does not simply open a valve and wait for a weight to be reached. Refrigerant enters in a fast fill phase and then switches to a slow trim fill phase near the target, so the liquid column in the hose settles and the final weight is reached without overshoot. This two-step approach is what makes 0.5 percent accuracy repeatable on short charges of a few tens of grams as well as on large ones.

Weight and pressure are read at the same time and compared against the expected curve for the recipe. If the weight rises while the pressure does not, the hose is blocked or the valve is closed; if the pressure rises faster than the weight, the line contains air. The cycle is stopped and the reason is displayed instead of being discovered at the end-of-line test.

Up to one hundred recipes can be stored, each holding charge weight, hold time, evacuation time, vacuum limit, pressure limits and accuracy window. Selecting a recipe by number means the operator cannot change parameters by accident, and different unit models can run on the same station without mechanical adjustment.

The scale is re-zeroed at the start of every cycle, and slow drift of the load cell is compensated over the working day. This matters on a production line where the same station runs for two or three shifts: without it, the first unit of the morning and the last unit of the evening would not be charged to the same weight.

• Simultaneous digital display of pressure, weight and vacuum
• 0.5 percent charging accuracy over the whole working range
• Automatic sequence: leak hold, evacuation, charging, verification
• 100 programmable recipes for different unit models
• Data logging of each charging cycle with export function
• Alarm output for over-pressure, under-vacuum and scale drift
• Automatic tare adjustment and slow drift compensation for long shifts
• Fast fill and slow trim fill stages to avoid overshoot on small charges
• RS485 interface for line PLC, MES or printer connection, plus USB export

The station is used wherever the same unit model is charged again and again and the charge weight has to be provable afterwards:

• Air conditioner final assembly and testing stations
• Heat pump and chiller commissioning
• Refrigeration condensing unit production
• Service centres requiring traceable charge records
• Compressor and heat exchanger sub-assembly lines where the charge is added before final assembly
• R32 and R290 production lines where the charged weight must be documented for safety files
• Laboratory and OEM pilot lines that need one station for several unit models

Refrigerant equipment is bought for years of production, so the support behind the machine matters as much as the specification. Every station is delivered with a calibration certificate and a documented test record of the pressure and vacuum channels, which is the starting point for later traceability audits.

Guangzhou HongCe Equipment Co., Ltd. has been designing and building test and production equipment in Guangzhou, China since 2003. Roughly half of our annual output is exported, and the machines are used by third-party laboratories, appliance and HVAC factories, and inspection bodies that work to IEC, UL, GB and EN standards. Our slogan states the position we have kept for more than twenty years: industry-leading test equipment, advanced online systems and solutions, anywhere in the world.

The company is ISO 9001:2015 certified, and machines supplied to the EU market carry CE marking. Mechanical fabrication, control cabinet assembly, PLC and HMI programming, refrigerant circuit assembly and final calibration are all done in our own workshop, so a station can be engineered around a customer's production sequence instead of being adapted from a catalogue item. Our engineers keep the refrigerant, pressure and vacuum know-how in-house, which is why questions about charging recipes, leak limits or flammable refrigerant handling are answered by the people who built the machine.

Most of our refrigerant equipment is delivered as a project rather than a catalogue item: the charging range, recipe structure and interface are agreed with the customer's process engineer, then built and tested on our own bench before shipment.

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Customers comparing this machine usually also look at the following stations from our refrigerant filling equipment range:

• Automatic Refrigerant Filling Machine with 2000 g Scale and 0.1 g Resolution
• Refrigerant Filling Equipment with Automatic Leak Pre-Check
• Large Capacity Refrigerant Filling Equipment for Heat Pump Production
• Refrigerant Filling Equipment with Multi-Refrigerant Precision and MES Traceability