Central air conditioning maintenance tips
Guangdong HEAD-POWER Air conditioning remind you to pay attention to the maintenance of central air conditioning.
Do you know the maintenance knowledge of central air conditioning, which is harmful if it is not maintained for a long time?
Corrosion: The cooling and chilled water of the air conditioning system is highly corrosive without treatment. If ordinary steel sheets or nails are put into the water, rust will appear in a few days. The longer the storage time, the more serious the corrosion. The inner wall of the equipment is often rusted off due to corrosion, or even perforated. The rusted off will block the coil and reduce the cooling effect; at the same time, the existence of corrosion greatly shortens the service life of the equipment.
Scale formation: Inorganic salt crystals dissolved in water in the pipeline are precipitated, and scale is formed on the wall of the heat exchange surface such as the condenser, resulting in a reduction in heat exchange efficiency and a reduction in cooling effect. In severe cases, it decreases by 30%. At the same time, the increase of hard scale will increase the power consumption or fuel consumption, and increase by 35% in severe cases.
Biological slime: due to the formation of dirt in the mud, sand and humus of the water, and the biological slime formed by bacteria, algae and other microorganisms and their secretions, the pipeline will be blocked in severe cases; and the dirt and slime will affect the heat The exchange efficiency and excessive power consumption cause high-voltage operation, and in severe cases cause over-pressure shutdown. All these have seriously affected the normal operation of the air conditioning system.
Main engine: The main engine runs for a period of time. The vibration of the compressor will cause the loosening of the copper pipe joints or the cracking of the welding seam, resulting in the leakage of refrigerant and freezing oil. A slight leak may cause the cooling effect to decrease and the low pressure alarm. In severe cases, the compressor will not be properly cooled and lubricated. Finally, the compressor overheats and the burns are caused.
End: After running for a period of time, dust will accumulate on the filter net and increase air resistance, which will cause the air volume to decrease or block; the decrease in air volume will cause the indoor air conditioning effect to be poor, and no effect after blocking, affecting normal use. The indoor unit cannot filter the fine dust because of the primary effect filter. Therefore, the dust accumulates on the fin surface of the indoor heat exchanger after passing through the filter, and the heat transfer decreases due to the accumulation of dust. Long-term operation will cause serious wear of the motor bearings, increase the output power of the motor, and increase the noise.
Electricity: After long-term operation of the air conditioner, due to the heating of wires and components, vibration of the unit, etc., the joints will loosen and fall off, 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 component value deviation, etc., which causes the loss of the operating parameters of the unit or confusion, which prevents the unit from operating normally. Control elements such as temperature probes, pressure sensors, flow sensors, and antifreeze protectors are damaged, causing the unit to fail to operate under normal operating conditions and causing unpredictable failures in the operation of the unit.
Water system: The chilled water system, because tap water is often used to make up water through the water tank, it will breed algae, bacteria and other microorganisms in the expansion tank and the pipeline. Its dead corpses and sludge, oil and other debris adhere to each other. Attached to equipment and pipelines, affecting the amount of circulating water and heat exchange. At the same time, the generation of microorganisms and sedimentation promotes the formation of concentration corrosion batteries and the generation of under-scale corrosion, thereby increasing the corrosion rate of metals.
Fin heat exchanger: As long-term operation will be full of dust, if it can not be cleaned in time, it will not only increase the resistance of the heat exchanger, but also reduce the air volume of the fan. The reduction will make the heat exchanger inefficient. Due to the poor heat exchange effect of the outdoor heat exchanger, the refrigerant cannot obtain the necessary heat dissipation. The high pressure of the system increases, high pressure protection and exhaust temperature protection appear; due to the increase of high pressure, the low pressure of the system will generally increase, and the compressor load Increased, it is likely that compressor overload or protection module protection will occur.