HuixianTianyang Electric Co.Ltd.
Cleaning method and troubleshooting of condenser
2025-07-25
All condensers are components of air conditioning systems that use the heat of gas or vapor to dissipate and operate. They can quickly transfer the heat in the pipes to the air near the pipes. The device that converts gas or vapor into liquid during the distillation process is called a condenser,.
The normal operation of the condenser can avoid premature wear of components and maintain optimal working condition. How to troubleshoot the condenser?
1. Excessive condensation temperature (condensation temperature: refers to the condensation temperature of the refrigerant in the condenser) Elimination method:
① Insufficient cooling water: If the high-temperature gas discharged by the compressor cannot be effectively cooled, causing the condensation temperature to rise, sufficient water should be added.
② Excessive cooling water temperature: This prevents the high-temperature gas discharged by the compressor from exchanging heat effectively, resulting in an increase in condensation temperature. Therefore, appropriate cooling measures should be taken for the cooling water.
③ The low vacuum and dryness of the refrigeration system increase the condensation temperature. The solution is to increase the system vacuum.
2. Low condensation temperature:
① Insufficient refrigerant quantity in the system: Sufficient refrigerant should be added according to the instructions.
② The cooling water temperature is too low or the water flow rate is too high: it should be adjusted appropriately according to the cooling capacity and temperature difference.
3. Too much scale on the condenser:
The formation of scale in the condenser is mainly due to the presence of heavy carbonates, sulfates, chlorides, silica, and other impurities containing high amounts of Ca, Ma, Na elements in the cooling water. The presence of these substances gives the water a certain hardness. After the formation of scale, the water flow resistance increases, the heat exchange efficiency decreases, resulting in an increase in condensation temperature, a decrease in refrigeration capacity, and an increase in power consumption. In severe cases, it can lead to erosion of the pipe wall.
To prevent such accidents from happening, clean water should be used. If the water quality does not meet the requirements, chemical water treatment should be used. If the cooling water is seawater, measures should be taken in the design to prevent corrosion of pipelines and equipment by seawater, as well as adhesion or blockage of pipelines and equipment by aquatic organisms and plants in seawater.
Condenser cleaning steps
Preparation before cleaning
1、 Prepare sufficient chemical cleaning agents according to the crew situation.
2、 Check and prepare physical cleaning equipment, spare parts, water source hose connections, and consumables (nylon brushes)
3、 Prepare acid resistant pumps, rubber hoses, blind plates, circulating water tanks, flange connection sealing materials, etc. required for chemical cleaning.
4、 Prepare power supplies with leakage protection devices and hardware tools for cleaning.
Physical cleaning steps
1、 Remove the condenser (evaporator) end cover of the unit, carefully inspect each tube bundle, and use a specialized pipeline cleaning machine to remove debris from the tube bundle.
2、 Use a copper wire brush to remove dirt such as mud and scale from the front and rear end caps, as well as the front and rear tube plates.
3、 Rinse the tube bundle, front and rear end caps, and tube plate with clean water before installing them back in their original positions.
4、 Seal the inlet and outlet pipes of the condenser (evaporator) of the unit with blind plates, and inject clean water into the unit from the drain valve. After the water is full, check the tightness of the unit's water system.
5、 No water leakage was found after the unit was filled with water, and the physical cleaning work was completed.
Chemical cleaning steps
1. Connect the chemical cleaning circuit, with the output end of the circulation pump connected to the drain valve of the unit condenser (evaporator), and the suction end of the circulation pump connected to the exhaust valve of the condenser (evaporator).
2. Seal the inlet and outlet pipes of the condenser (evaporator) with blind plates.
3. Inject clean water into the unit from the condenser (evaporator) drain valve and check the system's airtightness.
4. Start the circulation pump and confirm that there is no gas present in the system.
5. Slowly pour H-101 multifunctional corrosion inhibitor into the circulating water tank, with a dosage of 3-5 ‰, to mix it thoroughly with water in the system. Then add H-102 copper ion masking agent and run for 10 minutes, with a dosage of 5-10 ‰.
6. Add H-402 cleaning agent at once according to the scaling situation of the unit. Generally, the amount of cleaning agent added is 8-10% of the circulating water volume. (Adjust the amount of cleaning agent according to the scaling situation)
7. During the cyclic cleaning process, check the pH value of the cleaning solution at any time to ensure it is ≤ 5. If the pH value approaches 7, continue to add cleaning agents until the pH value remains ≤ 5, indicating that the cleaning is basically completed.
8. Add caustic soda (sodium hydroxide) into the circulating water tank to neutralize the residual liquid, and discharge the residual liquid when its pH value reaches 7.
9. After rinsing with clean water, inject water into the unit. Once the water is full, add H-503 pre film agent to the circulating water tank, usually at a rate of 2-2.5% of the circulating water volume. After circulating for 3-5 hours, drain the remaining liquid.
10. Open the end cap or blind plate, check the cleaning effect and ask Party A to inspect.
11. After both parties confirm that the cleaning is qualified, the chemical cleaning work is completed.
Work requirements after cleaning
1. Restore the installation of the supply and return water pipeline, pay attention to checking the sealing material at the flange connection, and replace it if necessary.
2. Open the pipeline valve to check the tightness of the pipeline installation, and no dripping or leakage is allowed.
3. Count equipment and tools, clean the work site.
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2025-12-06
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