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Changhong air conditioner, poor refrigeration, small air volume of indoor unit
Source: http://xrqa.cn Author: Mianyang Changhong air conditioning after sales maintenance update date: 2015-09-09 20:21
1. Fault phenomenon
The refrigeration is poor, the air volume of indoor unit is small, and the temperature of the air blown out from the outlet is lower than that under normal conditions, and there is even fog. Generally, the evaporator and return pipe (thick pipe) are frosted or all of them are frozen, and the current of the whole machine is too small.
2. Fault analysis
The fault is usually caused by poor cooling of indoor unit. The main reason is that the filter screen is dirty, followed by the evaporator and indoor air duct, and some are abnormal fan motor and starting capacitance.
3. Maintenance
Remove the filter screen, observe the filter screen, indoor air volume, and determine the maintenance position.
Case 1: the filter screen is dirty and washed with water.
Case 2: after removing the filter screen, it is found that the evaporator frosts, the air volume increases significantly, and the frost begins to melt. Generally, the evaporator is too dirty. It can be further confirmed after natural defrosting, and the evaporator should be cleaned when it is confirmed to be very dirty. Observe whether the indoor fan is too dirty, if dirty, also need to clean. When collecting air from the refrigeration system, the connecting line of the indoor unit should be removed first, and then the binding tape of the connecting pipe of the indoor unit should be opened in turn. The nozzle of the connecting pipe should be unscrewed, and the indoor unit and evaporator should be removed to expose the indoor fan duct. If there is too much dust or debris, the fault can be eliminated by directly brushing with a small amount of water.
Case 3: after the filter screen is removed, the air output does not change, and the frost on the evaporator does not melt. Generally, the speed of the indoor fan motor is not enough. The fan blades of indoor unit should be moved flexibly by hand; Secondly, remove the fan starting capacitor on the control board and measure its capacity with the capacitance block of the digital meter. If the capacity becomes smaller, replace the capacitor of the same type; If the capacitance is normal, try to change the fan motor.