[Mechanical Equipment Technology Edition] Daily Question 201801029: Common Faults in Refrigeration Systems (8.5)
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This post was last edited by YORK Industrial Refrigeration on 2018-1-31 at 10:46. Starting from now, in order to enhance communication among users, a 【Daily Question】 campaign has been launched on the Mechanical Equipment Technology forum; we hope everyone will participate actively to progress and improve together! ! ! Rewards: 3 points for active participation, 10-15 points for correct answers. This question is valid for two days; no score will be assigned if more than two days pass. What are the reasons for too low exhaust pressure in a refrigeration compressor? 1. Compressor issues: 1.1 Wear of the compressor screws, low gas delivery efficiency, and high leakage rates. 2. System issues: 2.1 Low suction pressure; 2.2 Problems with heat exchange in the condenser. I’ve mentioned the main aspects; you can look into the finer details on your own. ============================== High-quality promotions: Mechanical equipment——Maintenance procedures for York screw compressors https://bbs.hcbbs.com/thread-1806833-1-1.html Mechanical equipment——Upgrading of York Quinton control centers https://bbs.hcbbs.com/thread-1804837-1-1.html Mechanical equipment——Major repairs for GEA Grauso screw compressors https://bbs.hcbbs.com/thread-1800467-1-1.html Mechanical equipment——Disassembly and maintenance of British HOWDEN screw compressors https://bbs.hcbbs.com/thread-1832529-1-1.html Mechanical equipment——Disassembly and maintenance of Japanese Maekawa MYCOM screw compressors https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=
1. Excessive water volume in the condenser, resulting in too low water temperature. 2. Excessive air flow in the condenser and low temperature. 3. Leakage in the intake and exhaust valve plates. 4. The gap between the cylinder wall and the piston is too large, allowing air to leak from the cylinder into the crankcase. 5. The return valve of the oil separator failed, causing high-pressure gas to return to the crankcase. 6. The cylinder gasket is damaged, causing air leakage between high and low pressure systems. 7. Insufficient refrigerant in the system. 8. Excessive frosting on the refrigeration evaporator results in too low suction pressure. 9. The evaporator filter is too dirty, resulting in low suction pressure. 10. Severe blockage has occurred in the area between the reservoir and the compressor.
The system is clogged; ice blockages, dirt blockages, and faults in the throttle solenoid valve can all cause this issue.
Leakage, excessive clearance, and reduced speed. . .
1. The inlet valve of the condenser or the water flow control valve is set too high, resulting in an excessive supply of water. 2. Due to climate, location, or water extraction methods, the water temperature or air temperature may be too low, which affects the condensation temperature of water-cooled or air-cooled condensers and results in too low exhaust pressure. 3. The compressor draws in wet vapor. 4. Exhaust valve leakage.
1. Excessive water volume in the condenser, resulting in too low water temperature； 2 Excessive air flow in the condenser and low temperature ； 3. Leakage in the intake and exhaust valve plates ； The gap between the 4 cylinder walls and the pistons is too large
1. Excessive water volume in the condenser, resulting in too low water temperature； 2 Excessive air flow in the condenser and low temperature ； 3. Leakage in the intake and exhaust valve plates ； The gap between the 4 cylinder walls and the pistons is too large
The refrigeration system is short of fluorine; the indoor fan motor runs at a low speed or does not operate, the compressor’s exhaust efficiency decreases, there are leaks in the four-way valve or the electromagnetic bypass valve, the refrigeration system is clogged, and the low-pressure valve on the outdoor unit is not open. The variable-frequency compressor does not increase its frequency.
What are the reasons for low exhaust pressure in a refrigeration compressor? Answer: 1. Low inhalation pressure ； 2. The exhaust pressure valve is opened too wide ； 3. The opening degree of the condenser cooling water valve is not adjusted properly ； 4. Fault in the pressure transmission system ；
1. Excessive water volume in the condenser, resulting in too low water temperature. 2. Excessive air flow in the condenser and low temperature. 3. Leakage in the intake and exhaust valve plates. 4. The gap between the cylinder wall and the piston is too large, allowing air to leak from the cylinder into the crankcase. 5. The return valve of the oil separator failed, causing high-pressure gas to return to the crankcase. 6. The cylinder gasket is damaged, causing air leakage between high and low pressure systems. 7. Insufficient refrigerant in the system. 8. Excessive frosting on the refrigeration evaporator results in too low suction pressure. 9. The air conditioner evaporator filter is too dirty, resulting in low suction pressure. 10. Severe blockage has occurred in the area between the reservoir and the compressor.
1. Excessive water volume in the condenser, resulting in too low water temperature. 2. Excessive air flow in the condenser and low temperature. 3. Leakage in the intake and exhaust valve plates. 4. The gap between the cylinder wall and the piston is too large, allowing air to leak from the cylinder into the crankcase. 5. The return valve of the oil separator failed, causing high-pressure gas to return to the crankcase. 6. The cylinder gasket is damaged, causing air leakage between high and low pressure systems. 7. Insufficient refrigerant in the system. 8. Excessive frosting on the refrigeration evaporator results in too low suction pressure. 9. The evaporator filter is too dirty, resulting in low suction pressure. 10. Severe blockage has occurred in the area between the reservoir and the compressor.