Dongfang Instrument
Key words:
Leak Detection Equipment for Commercial Air Conditioning Industry
Mainly composed of helium recovery system, vacuum system, vacuum chamber system, pneumatic drive system, electrical control system, helium mass spectrometer leak detector, etc.
Key words:
Factors Affecting Comfort in Summer - Refrigerant Charging Machine
In summer, the use of air conditioning cooling is essential, so a good refrigerant charging machine is a key factor in determining summer comfort. Before adding refrigerant to the car air conditioning, first evacuate for 1 hour. When the system has no leaks and is under vacuum, open the R134a bottle with the nozzle facing down, loosen the soft hose connector in the middle of the pressure gauge to release the air in the hose, and open the high-pressure side manual valve to inject liquid refrigerant from the high-pressure side.
Key words:
How to correctly detect insufficient refrigerant
The weighing and charging method is the truly correct method, applicable to any refrigeration system. The method involves weighing the amount of refrigerant to be charged, and what needs to be done is to find out the amount or range of refrigerant to be charged from the relevant data. This is not just an observation method, but a real charging method. As long as the manufacturer specifies the correct charging amount on the nameplate for water-cooled cabinets or split units, weighing and charging can be done using a beam scale, electronic scale, dial scale, or other weighing devices after completely drying and evacuating the system. This charging method is the most suitable. For a system with some refrigerant, there are two methods to charge the refrigerant. 1. Release the already charged Freon, re-evacuate, and weigh for charging; Many maintenance personnel are reluctant to spend time recovering the refrigerant from a system that is undercharged before recharging. In this case, the following alternative method can be used. However, this is a comprehensive application of all the methods mentioned earlier or one or two of them. Note: Before using these methods, ensure that all coils are clean and that the airflow is correct. 2. Use the following method to continue adding refrigerant, measuring and recording all data. A. Charge while simultaneously checking superheat and subcooling. For air-cooled direct expansion systems, set the subcooling to 8~12°C and superheat to 7~8°C. B. Check the temperature difference between the inlet and outlet air of the coil. Ensure that the airflow of the condenser and evaporator is correct, as well as under moderate load conditions. C. Check and compare the suction/discharge pressures. Look for standard data provided by the manufacturer in the installation, operation, and maintenance manual. D. If there is a sight glass, check for bubbles in the sight glass. If there are bubbles, confirm whether they are due to excessive pressure loss or insufficient refrigerant. E. Check the compressor current. If the current is too low, analyze the reasons for the low current under several types of operating conditions of the system.
Key words:
Products
Sweep the access mobile terminal
Chengdu Dongfang Instrument Co., Ltd.
Service Hotline:8602865518699
Sales Hotline:8613908209306 (Equipment)
8613908085776 (power supply and module)
Contact E-mail:cdoi@cdoi.com
Contact address: dongyi technology co., ltd., no 199, section 2, chongshuang freight avenue, chongzhou city, Chengdu city, Sichuan province, China
CopyRight©2025 Chengdu Dongfang Instrument Co., Ltd. All rights reserved
Hotline：8602865518699
After Sales(power supply and module)：8613908085776
After Sales(Equipment)：8613908209306
Email：cdoi@cdoi.com
Online message
The main products of our company now include refrigerant filling machine, explosion-proof filling machine, vacuum purification filling machine, special power supply, helium inspection equipment, etc.
* Note: Please be sure to fill in the information accurately and keep the communication unblocked. We will get in touch with you as soon as possible.