D. Check the fluorine system if leakage or not
That means to check whether there is oil stain in the pipe joints and inflatable valves in the machine. If there is oil stain, it shows that there has been leakage before using. In this way, low-voltage protection will appear when the machine is turned on, or the heating effect of the host will be affected. If the refrigerant leaks, find the leakage point first, deal with the leakage point, and then check the pressure gauge to see if it needs to be supplemented.
E. Check the air outlet of the main engine for blockage or poor ventilation.
The unit shall be kept clean and dry around with good ventilation. If the air outlet is blocked or sundries are piled around the unit, the heat exchange capacity will be affected, and even the protection and shutdown of the main unit will be caused. When the ash on the evaporator fins is serious, it should be cleaned in time. Before cleaning the unit, turn off the main power supply of the unit.
F. Check whether the evaporator needs to be cleaned.
After a period of operation of the main engine, the fins will inevitably be blocked by dust and other debris, which will affect the heat exchange efficiency, reduce the heating effect and increase the energy consumption. So in general, the fin heat exchange should be cleaned after 6-12 months of operation. When the surrounding environment is polluted seriously, the cleaning cycle should be shortened.
Cleaning method: first cut off the power supply of the unit, and then use high-pressure gas against the air inlet direction of the heat exchange to repeatedly wash the fins. The washing direction is perpendicular to the fins to prevent the fins from falling back. It can also be washed with high-pressure water. When washing, it is necessary to control the water pressure, prevent fins from falling, and protect electrical components. If there is oily substance on fins, it is necessary to wash with water with neutral detergent. The cleaning effect is based on the fact that the primary color of fins or the water flowing down the fins is clear water.
G. Check whether the operation and safety protection setting parameters of the host have been changed.
Before the first heating, the manufacturer will adjust the parameters, but after running a heating season, Party A may miss operate and change some parameters. For example, the entry conditions of defrosting, the opening degree of thermal valve, whether the unit is under the control of inlet water temperature or return water temperature, etc. if the settings are not correct, the temperature operation of the system will be affected.