Importance of Central Air Conditioning Condenser Cleaning
Central Air Conditioning Condenser Cleaning I. Significance of Cleaning: During the operation of water-cooled central air conditioning units, scaling, biofouling, and oxygen corrosion are the three major challenges affecting unit operation, directly impacting both safety and operational costs. How to scientifically and economically address these issues? We offer the following suggestions for your reference. Firstly, the issue of scaling: Due to the relatively hard water quality in Beijing, the general total hardness is around 300 mg/L, with some areas exceeding 450 mg/L. This high-hardness water quality, especially for units without water treatment for cooling water, is undoubtedly harmful to the operation of central air conditioning. It tends to cause scaling inside the copper tubes of the main condenser and on the fill material of the cooling tower. Generally, scaling occurs at a rate of about 0.5 mm per year. Since the thermal conductivity of scale is around 1.1, while that of copper tubes is 170, the difference is substantial. The formation of scale directly affects the heat exchange rate of the unit, thereby impacting the refrigeration effect. It also easily leads to under-scale corrosion and other issues. Calculations show that when scaling reaches 0.8 mm inside the copper tubes, the main unit's refrigeration efficiency drops by 40%.
Let's delve into the usage issues of screw machines.
Deficiencies in the communication of screw refrigeration units: The control of various modules by the computer controller is completed through communication lines and the main interface board, with the main cause of communication deficiencies being poor contact or a break in the communication lines, especially due to dampness and oxidation at the interfaces causing poor contact. Other unit electronic boards or main interface board deficiencies, incorrect selection of address dip switches, and power supply issues can all contribute to communication deficiencies.
Screw Chiller Unit Low Pressure Shortcomings: Low compressor suction pressure, water-source heat pump maintenance required, triggering the low-pressure protective relay. The compressor suction pressure reflects the vapor pressure, with a normal range of 0.4~0.6MPa and a protective setting of 0.2MPa. Low suction pressure results in reduced gas return volume, less refrigeration capacity, and waste of electricity. Poor heat dissipation in the compressor motor for gas return cooling can easily damage the motor.
After inspecting each part and repairing or replacing any damaged parts, assembly can proceed. During assembly, be mindful of the markings you noted during disassembly and do not mix up the parts. Continuously measure the assembly gaps of each component. For those exceeding the standard gap, adjust the gap or replace the part. Refer to the gap table for assembly gaps.
1. Clean all parts thoroughly and dry them with compressed air.
2. Ensure all necessary tools are prepared and thoroughly cleaned.
3. Insert the main bearing into the bearing hole in its original position, and measure the inner diameter of the bearing to ensure it meets the gap requirements for fit with the rotor shaft颈.
4. Apply sealant evenly on the mating surface between the suction end seat and the housing.
5. Rest the suction end bracket against the intake end of the housing, and thread in some bolts to bear the weight. After inserting the locating pin, tighten the bolts.
6. Install the sliding valve and its guide plate. The guide plate must be first positioned with a locating pin before it can be secured with bolts.
7. Apply clean, the same type of lubricating oil used during operation to the main bearing bore at the intake end and the internal bore of the machine body. Insert the positive and negative rotors. The later-mounted rotors should be slowly threaded in; do not force them into the machine body.
8. Tightly position the male and female rotors against the suction end seat, measure the size difference between the rotor exhaust face and the body exhaust face. This value is the sum of the suction and exhaust gaps.
9. Apply sealant evenly on the mating surface between the exhaust end cap and the housing.
