Warm prompt: The reasons for the decline in heat exchange effect are as follows: condenser leakage; foreign body blockage; a large amount of dust or oil stains accumulated and attached on aluminum alloy fins; oxidation and deterioration of oil quality in the refrigeration system, causing oil scale on the inner wall of the coil. The maintenance methods are as follows:
(1) For the common leaks appearing in the condenser, the signs of leaks checked from the surface are mostly due to the appearance of oil stains on the condenser, and leaks between the fins are mostly due to cracks or sand holes in the coil. The U-shaped bend welding joints of the condenser should also be checked for leaks. This kind of leak fault can be repaired by welding or replacing new parts.
(2) The main reason for the blockage of the condenser is that the connection cap at the condenser connection port melts the weld droplets or slag during the burning welding process, causing the weld blockage at the pipe port, which makes the airflow noise of the refrigerant larger when the condenser cools, or does not cool or heat. The blockage of the condenser is mostly caused by foreign bodies in the system. For blockages, high-pressure nitrogen can be used to blow off dirt or replace new parts.
(3) The dust on the condenser can be brushed and washed with a hairbrush and tap water, or blown off with compressed air or nitrogen. When cleaning the condenser, avoid electrical components and circuits getting damp or water entering. If necessary, the gas control components and related circuits can be removed before cleaning. If the aluminum alloy fins of the condenser are covered with oily dirt (this situation is mostly caused by greasy smoke in the surrounding environment, such as outdoor units close to kitchen stoves), strong degreasing cleaning agents (such as kitchen degreasing products) can be used to remove the dirt, and then washed with tap water.
Data source: Beijing Sanyo Air Conditioning Repair http://blog.tianya.cn/blogger/blog_main.asp?BlogID=3766351.
Analysis and testing: After inspection, it was found that there were leaks in the condenser.
Repair method: Weld the leaks, and the refrigeration test runs normally.
Sanyo air conditioning, pinholes appear in the condenser, resulting in poor cooling effect.