Abstract: With the improvement of modern living standards, air-conditioning has become an indispensable electrical device in home and office environments. However, after a long period of operation of the air conditioner, a large amount of dust, bacteria and dirt will accumulate on the condenser, which not only affects the cooling efficiency and reliability of the components, but also have an adverse effect on indoor air quality. Therefore, the self-cleaning function of air-conditioner condenser is particularly important, For the effect of air-conditioning condenser self-cleaning using the method of comparative testing, after six working conditions test to determine the optimisation scheme to enhance the operating frequency of the outer unit frost stage, while the implementation of the inner tube overload limit frequency, the programme significantly improves the thickness of the outer unit frost, optimising the effect of self-cleaning.

Key words: Self-cleaning, Condenser, Electronic expansion valve, Capillary tube, Ash build-up, Effectiveness