Central air conditioning maintenance purpose which: first: the purpose of the maintenance routine maintenance on the air conditioner, make sure it is safe, reliable, high-performance, long-life operation of the necessary conditions, the most important is cleared up dirt. Second: Cleaning content often less is removed by suction panel and dirt on the case, but also use a soft cloth or a damp cloth to wipe the dust and dirt of large panels and chassis, central air-conditioning maintenance Never use gasoline, kerosene or other Liu cleaning chemical cleaning. Cleaning also includes wash clean the evaporator water pump filter Tianjin maintenance, keeping the evaporator, condenser cleaning, maintaining orderly cooling fins arranged gap flow. Third: central air conditioning maintenance failure causes the room air conditioner fails for many reasons, central air-conditioning maintenance can be divided into several categories: improper use, external damage spare parts; electrical system failure; cooling system failure. Produce odor occurs because air conditioning parts air conditioning smell is usually the evaporator refrigeration system. The evaporator is vaporized refrigerant place water source heat pump repair oil change, a lot of it is vaporized refrigerant heat it produced a cooling effect of air conditioning. But at the same time reduce the air temperature, the evaporator will condense a lot of water drops. Coupled with the evaporator itself has the effect of the air filter, so water will condense air containing the dirt. When the air conditioning is working properly, the dirt will be discharged outside the vehicle with water source heat pump maintenance, but there are a few remain on the evaporator. And when the air conditioning stopped working, will be left on the evaporator condensate water has not been discharged, the water again and dust in the air, viruses and soot combined, over time it will mildew, odors.