Pacific Automotive Network must first check whether the coolant is sufficient. If the coolant is missing, the air conditioner will not heat. You also need to check whether the cooling fan is working properly. If the cooling fan is rotating normally, the water temperature cannot rise and the air conditioner will not heat. A clogged or leaking heater water tank can also cause no heating.
Improper use. The air filter accumulates too much dust, and the air vents inside and outside the air conditioner are blocked by foreign objects, resulting in a reduction in air output from the air outlet and insufficient heating capacity. This is not a malfunction, but a maintenance problem of the air conditioner. .
The air conditioner needs regular cleaning and maintenance during use. When cleaning the air conditioner, the main parts to be cleaned are the air conditioner's filter, radiator, condenser and other components. At the same time, the vents need to be checked in time to ensure Ventilation openings are clear. Generally, it is appropriate to clean the filter once every half month. In addition, if the door cracks and wall holes in the air-conditioned room are not blocked, or the windows and doors are opened frequently, it will also cause indoor heat loss. You should know how to use the air conditioner correctly.
Environmental factors There are three types of heating and cooling air conditioners: heat pump type, heat pump auxiliary electric heating type and electric heating type. Under the condition of equal heating capacity, the power consumption of the first two types is about half less than that of the third type. Taking into account the power supply capacity When it comes to electricity consumption, families now generally choose the first two types of air conditioners. However, the disadvantage of their use is that in environments below minus 5°C, the heating effect of air conditioners in winter is not ideal.
For heat pump air conditioners without automatic defrost, the lowest ambient temperature used is 5°C above zero. Below this temperature, heating will not occur or the effect will be poor. This is because of external heat exchange The reason is that the frost on the air conditioner blocks the air flow and can no longer absorb heat from the outside world; for a heat pump air conditioner with automatic defrost, the lowest ambient temperature it uses is minus 5°C, and it cannot effectively control the air conditioner below this temperature. hot.
The defrost controller fails. When the heat pump air conditioner is in the heating state, the evaporator is located in the outdoor unit. For heat pump air conditioners that use a hot flush defrost device, if the defrost controller fails, the air conditioner will If the system cannot enter defrost operation in time, the evaporator will freeze during heat pump heating, affecting the heat exchange efficiency of the air conditioner, resulting in insufficient heating capacity or even shutdown.
When this happens, you should pay attention to observe whether there is misalignment of the defrost temperature sensing device, sticky contacts or poor contact, slippage of the fan impeller or obstruction of the air duct, or failure of the solenoid valve or starting relay.
Insufficient refrigerant. Due to leakage in the refrigeration system, there is insufficient refrigerant participating in the heat cycle in the system, resulting in a decrease in heat exchange efficiency, resulting in insufficient heating capacity. If there is such a fault, the heating and cooling capacity of the system will be insufficient. At this time, connect the pressure gauge and measure the pressure of the system. You will find that the pressure is significantly lower than normal. Check the pipeline again. If there is a serious leak, there will be If obvious oil stains are found, for minor leaks, the leak should be detected with an electronic leak detector. Find the leak, repair it completely, and then refill the refrigerant.
The four-way valve cross-gas heat pump air conditioner switches between cooling and heating states through a four-way valve. During cooling, the outdoor heat exchanger acts as a condenser, and the indoor heat exchanger acts as an evaporator to absorb heat; while during heating, the outdoor heat exchanger acts as an evaporator, and the indoor heat exchanger acts as a condenser to release heat.
If the four-way valve crosses the air, part of the refrigerant that should participate in heat exchange will directly return from the compressor outlet pipe to the return pipe at the four-way valve, resulting in a reduction in the refrigerant participating in heat exchange. The heat exchange efficiency decreases, resulting in insufficient heating capacity.
(Pictures/Text/Photos: Pacific Automotive Network Question and Answer Calling the Beast)