Evacuation and Charging Stations
Single and dual refrigerant evacuation and charging stations are produced by VTI. Combinations of functions in available stations include the following:
Pressure Decay Evacuation and Charging
Evacution and SmartStation™
Pressure Decay and Refrigerant Charging
Evacuation and Refrigerant Charging
VTI offers single ES Stations, which include a SmartStation™. VTI also provides a distributed Evacuation and Charging System which monitors up to 20 or more ES stations. The distributed system utilizes VTI’s SmartStationTM ES evacuation stations in concert with VTI’s Central Control Station. It monitors up to 20 or more ES stations for test status as well as logs test data for each evacuation cycle.
Evacuation Station Plus Dehydration Analyzer
VTI’s SmartStation™ ESPlus for evacuation of air-conditioner condensers or compressors incorporates mass spectrometer analysis of the gas being pumped from the product, thus providing improved product quality and reliability and the potential for increased plant productivity. A major benefit of the analysis capability of this system results from its ability to determine the exact optimum dehydration point, and therefore the optimum pump-down time, for each unit while it is being evacuated. Since the amount of moisture in each unit typically varies, use of the optimum pump-down time for each can minimize the overall production time for evacuation and thereby increase the total plant production capacity. This combined evacuation and analysis system also addresses the major failure problems that occur during evacuation, which are a time-delay failure in reaching the required vacuum level in the unit or a “Rate-of-Rise” failure.These can be due to evaporation of excessive water contained in the product, evaporation of some other contaminant, or an actual leak in the unit. By analyzing the constituents in the evacuation gas stream, the mass spectrometer identifies the cause or causes of the problem. Continued detection of water vapor indicates excessive moisture in the part, and major detection of the constituents of air indicates a physical leak. The mass spectrometer analysis also detects other contaminants that may cause a failure, such as vapors from residual refrigerant excessive lubricant, and can be used to identify manufacturing problems.
Distributed Evacuation and Charging System
The distributed Evacuation and Charging system from VTI provides the most efficient single point evacuation and charge capability with no disconnect/reconnects between operations. This minimizes the chance of connector leakage problems after product evacuation. Second only to having an actual leak, water is the greatest enemy in vacuum conditioning A/C units prior to charging with refrigerant. Performing frequent ‘rate of rise’ tests during the evacuation cycle monitors the condition of the vacuum being established allowing independent determination of the optimum cycle end time. This maximizes production throughput by using each individual pumping station only as long as necessary. ‘Wet’ units automatically get a longer pump time while ‘Dry’ units are allowed to move on more quickly. This enhances and ensures more consistent product quality. Distributing the charging capability, it is only used for a fraction of the complete cycle time for each unit being processed, allows a single charger to serve multiple stations so reducing cost. It is also possible to provide dual refrigerant capability in this system.
SmartStation™-based charging stations are used to pre-charge a leak test system with helium or refrigerant.
Vacuum Pumping Stations
VTI has the expertise in vacuum systems to design, manufacture and test vacuum pumping stations with specified performance and employing the latest vacuum technology. Pumping stations incorporating the simplest basic functions to a high performance station which includes control and monitoring of all functions are available from VTI. Examples of VTI pumping stations are (right) Blower Pumping Stations. The blowers are backed by Rotary Vane Pumps in the Vacuum Pumping Stations (right). Dump, pump, and vent vacuum pump stations are also designed and manufactured by VTI.