1. The hazards of long-term non-maintenance of air conditioners
Corrosion: The cooling and chilled water of the air conditioning system is corrosive if it is not treated, such as putting ordinary steel sheets or iron nails into the water, rust will appear after a few days, and the longer it is placed, the more serious the rust will be. The inner wall of the equipment often falls off due to corrosion, and even perforated, and the peeled rust slag will block the coil and reduce the refrigeration effectAt the same time, the presence of corrosion greatly shortens the service life of the equipment.
Scaling: The crystallization of inorganic salts dissolved in water in the pipeline forms scale on the wall of the heat exchange surface such as the condenser, resulting in a decrease in heat exchange efficiency and a decrease in refrigeration effect, and a decrease of 30% in severe cases. At the same time, if the hard scale increases, the electricity consumption or fuel consumption increases, and in severe cases, it increases by 35%.
Biological slime: due to the formation of dirt from water's soil, sediment and humus, coupled with the biological slime formed by bacteria, algae and other microorganisms and their secretions, the pipeline will be blocked in serious casesThe dirt and slime will affect the heat exchange efficiency, consume more electric energy, cause high-pressure operation, and cause overpressure shutdown in serious cases. All this seriously affected the normal operation of the air conditioning system.
Host: The host runs for a period of time, because the vibration of the compressor will cause the loosening of the copper pipe joint or the cracking of the weld, which will cause the leakage of refrigerant and refrigeration oil. In severe cases, the compressor will not be cooled and lubricated as it should be. Causing the compressor to overheat, strain and burn.
End: After running for a period of time, dust will accumulate on the filter screen, increasing air resistance, thus causing air volume to decrease or blockage;The decrease in air volume will cause the indoor air conditioner to have a bad effect, and there will be no effect after blocking, which will affect the normal use. The indoor unit cannot filter the fine dust due to the primary filter, so the dust accumulates on the surface of the fin of the heat exchanger in the room after passing through the filter, and the heat transfer decreases due to the accumulation of dust. Long-term operation will cause serious wear of motor bearings, increase the output power of the motor, and increase noise.
Electrical: After the long-term operation of the air conditioner, the joints will be loose and fall off due to the heating of wires and components, the vibration of the unit, etc., resulting in poor contact and phase loss: AC contactors and thermal relays will also have faults such as poor contact and open circuit. The electronic control part is affected by external interference, internal electrical components, etc., resulting in the loss or confusion of the operating parameters of the unit. The damage of the temperature probe, pressure sensor, flow sensor, antifreeze protector and other control components will cause the unit to fail to operate under normal working conditions, which will cause unpredictable failures to the operation of the unit.
Water system: chilled water system, because the tap water is often used to change water through the water tank, it will breed algae, bacteria and other microorganisms in the expansion tank and pipeline, and the corpse after death adheres to the sludge, oil and other debris together, attaches to the equipment and pipelines, affecting the circulating water volume and heat exchange, at the same time, the generation of microorganisms and sedimentation promotes the formation of concentration corrosion battery and the generation of corrosion under the scale, so that the corrosion rate of the metal is aggravated.
Fin heat exchanger: due to the long-term operation will be full of dust, if not cleaned in time, not only the heat exchanger resistance will increase, the fan air volume will decrease, but also the surface dirt coefficient of the fin will increase, the thermal resistance will increase, and the heat transfer coefficient will decrease, which will make the heat exchanger inadequate. [This article**:Refrigeration Encyclopedia*** Outdoor heat exchanger due to poor heat exchange effect, the refrigerant can not get the necessary heat dissipation, the high pressure of the system rises, and there is high pressure protection and exhaust temperature protection;Due to the increase of high pressure, the corresponding low pressure of the system will generally increase, and the load of the compressor will increase, and it is very likely that the compressor will be overloaded or protected by the protection module.
Second, the water system ** air conditioning maintenance content
1. Maintenance and overhaul of chillers for air conditioners.
1) Check the oil pressure and oil quantity of the compressor refrigeration oil;
2) System leak detection (refrigerant), find leakage points and deal with them in time;
3) Check for abnormal sounds, vibrations and high temperatures
4) Check the temperature and pressure of the condenser and cooler
5) Check whether all kinds of valves are normal.
6) Check the temperature and pressure of the water inlet and outlet of the chiller;
7) Check the terminal blocks on the main circuit and compact;
8) Check the electrical control part;
9) Check the lubrication system of the unit;
10) Check the working status of each instrument and controller;
11) Keep the device in a clean state;
12) Check and clean the filter dried, and the desiccant should be dried or replaced after moisture absorption;
13) Check and set the value of the safety protection device of the refrigeration equipment;
14) Check the oil pressure and oil quantity of the compressor refrigeration oil;
15) Check and tighten the wire contacts on the circuit;
16) Check the electrical control part;
17) Water treatment once a year, filter cleaning twice a year.
18) The treatment of the water system and the inspection and replacement of valves, filters, check valves, pressure gauges, thermometers, and thermal insulation of key parts.
3. Maintenance content of air handling equipment:
1. Inspection of air handlers and fan coil units (each time);
2. Maintenance and refueling of air handlers and fan coil units (at least once a year);
3. Clean the pipeline and remove the pollution (at least once a year);
4. Cleaning and dust removal of air handler (once or twice a year).
Fourth, the maintenance content of the multi-online system:
1. Troubleshooting, replacing damaged parts;
2. Check and record the high and low pressure, running current and voltage of the system;
3. Check and record the temperature of the pipe and the temperature of the straw;
4. Check and test the air volume, inlet and outlet air temperature, and temperature difference;
5. Check and lubricate the fan and moving parts;
6. Check and replace the damaged indicator lights and control switches
7. Check the transmission and reception of remote control signals
8. Check the routine operation of the electronic components of the control system;
9. Check the safety valve and other automatic control equipment;
10. Check the reversing function of the reversing valve;
11. Test the electrical insulation of all motors and wires with a shake meter
12. Check the contactor and motor starter, and tighten all screws
13. Check whether the Freon system is leaking;
14. Check and clean the drip tray of the condenser and flush the condensate pipe of the AHU and FCU
15. Flush the evaporator and condenser, and rinse the residual chemicals
16. Check and sort out all condenser fins;
17. Check the aging and damage of all insulation pipes;
18. Check the fan belt and adjust its tension
19. Check the sturdiness and safety of the rack;
20. Check for abnormal noise;
21. Clean the cold water tower, remove, replace and paint the corroded part;
22. Cleaning of the filter screen, internal and external machines, cleaning of circuits and pipelines.