More and more users in China are beginning to use air conditioners, from the cold storage in the early 1980s to the various commercial machines in the society such as chillers, cabinets, and embedded. More and more users are beginning to pursue the comfort and long-term use of air conditioners. The service life of air conditioners is generally 10 years, and the correct maintenance is about 15 years. General air conditioners require maintenance after the warranty period. Regular maintenance will improve air conditioning performance, extend air conditioning life, reduce electricity bills, and update equipment costs.
Central air conditioning maintenance
The maintenance contents of the central air conditioner are as follows:
1, evaporator and condenser
1 Wash and preserve the evaporator and condenser with a special cleaning agent.
2 Disinfect the filter with a special sterilizer.
3 Regularly check the air outlet temperature of the air conditioner every month.
4 Check and test the air conditioning unit roads every quarter.
5 Conduct insulation testing of air conditioners every quarter.
Evaporator and condenser
2. Cleaning of the chassis and inner casing
Insulation testing and cleaning of the air conditioning chassis.
3, the maintenance of electrical systems
1 Perform a comprehensive inspection and corresponding maintenance on the computer version of the air conditioner, the connection line of the internal and external units, and the electrical system of the external unit.
2 Check the electrical circuit of the air-conditioned bird, and control whether the switch and the protection device can work effectively and reliably.
3 Add appropriate amount of oil and lubricating oil to the compressor and fan motor according to the specified time and operation conditions to ensure the operation of the fan motor and compressor.
4 insulation measurement (power supply, compressor, fan motor, etc.).
5 Check the condition of the terminal and cable.
6 Operation current measurement (power supply, compressor, fan motor, etc.).
7 Check the status of the terminal and cable.
4. Inspection and experiment of maintenance and maintenance:
Check whether the electrical circuit is wrong, and test the insulation resistance of the electric circuit, compressor, and fan motor with a multimeter. The insulation resistance is greater than 2M ohms. Whether the terminal block and the crimping line are loose, and the power cord is aging.
5. Check whether the system has a magnetic collision and a leak point, and do an experiment to check the leak tightness to ensure that the system pressure is normal.
1 Check whether the reversing valve has a string of gas and a leak point, and do an experiment to check the leak tightness to ensure that the system pressure is normal.
2 Check the outer three-way valve for leaks and replace it regularly.
3 Whether the filter has a blockage and is operating normally.
4 The operation of the compressor fan is abnormal, vibration and noise are normal.
5 drainage system, to ensure that the condensate can be smoothly discharged.
Line check
6, the detection of current:
1 The current of the fan motor and compressor is measured by a digital ammeter to ensure the normal operation of the unit.
2 Use the current tester to conduct current detection on the air switch of the air conditioner to ensure the normal use of the air conditioner.
7, other:
1 leak confirmation
2 abnormal sound, vibration confirmation
3 fouling and rust confirmation
4 Drainage conditions are visually confirmed.
5 filter cleaning (2 times / year).
6 shell, panel cleaning (2 times / year).
7-point checklist production.
Air conditioning maintenance standards:
1. Clean the outside of the unit with a rag and check if the insulation layer is damaged. If the insulation layer is damaged, use aluminum foil paper and keep warm the insulation.
2. Remove the filter, rinse it with tap water, and install it.
3. Check if the screw of the unit bracket is loose and loose with a wrench. The unit should be operated without vibration and noise. If there is vibration, check the fault point and tighten the loose screws. Too much noise should be found out. If there is noise in the bearing, use a wrench to remove the motor, replace the bearing and add lubricant.
4. Check if the fins (heat exchange sheets) are too dirty. Rinse the fins with a cleaning pump and detergent.
5. Check the medium pressure of the compressor. If the pressure is insufficient, it should be replenished in time to ensure normal pressure.
6. Check the insulation performance and running current of the compressor and power line. The insulation resistance value of the motor should be >0.5MΩ with a 500V megger. Otherwise, further inspection and repair should be done. At the same time, the insulation resistance of the control circuit should be detected. Below 0.5MΩ, the wire should be replaced for electrical lines below 0.5MΩ.
7. Use a multimeter to check whether the voltage and current are normal, whether the line is unobstructed, and if there is a fault, it must be eliminated one by one.
8. Check the grounding wire and other wire terminals and screws. If it is loose or loose, it should be fixed and bandaged in time.
9. Check the operation of the whole machine and the air volume, temperature, temperature difference of the inlet and outlet, and whether there is air leakage or water leakage at each connecting pipe.
10. Ensure that the equipment can operate normally at any time, reach the standard wind speed and air volume; perform relevant requirements and make relevant records.
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