The real reason why the air conditioner only cools but not heats is here【】

The reason for only cooling but not heating-improper use

The air filter has too much dust and the vents of the internal and external machines are blocked by foreign objects. The function of the filter is to absorb the dust in the air. If the accumulated dust is too much and not cleaned in time, it will block the air circulation, resulting in the reduction of the air output from the air outlet, so that the internal heating cannot be brought out by the flowing air in time. Insufficient heating capacity. This is not a malfunction. It is a maintenance problem of the air conditioner. It can be restored to normal by removing the air filter regularly and cleaning it. Generally, it is appropriate to clean the filter once every half month (be careful not to use hot water above 40℃ when cleaning. For cleaning, do not use washing powder, detergent, gasoline, banana water, etc. to avoid deformation of the filter, and open flame drying); too thick dust on the evaporator and condenser will reduce the heat exchange effect and cause the heating capacity Decrease, the power consumption increases; the heating temperature is set too low; the door cracks and wall holes of the air-conditioning room are not blocked, or the windows and doors are opened frequently, causing indoor heat loss.

The reason why the air conditioner only cools but does not heat-environmental factors

There are three types of products, namely 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. Considering the power supply capacity and electricity cost, the current households generally choose the first two types of air conditioners (but pay attention to their use conditions, the first two types). It is only suitable for environments above minus 5°C, obviously not applicable to northern regions). For heat pump air conditioners, the ambient temperature during heating is too low, and the energy efficiency ratio of the air conditioner is also reduced. The heating effect is not ideal in the colder winter, which is a normal phenomenon. For heat pump type air conditioners without automatic defrosting, the lowest ambient temperature used is 5°C above zero. Below this temperature, no heating is possible or the effect is poor. This is because the frost on the external heat exchanger blocks the air. Flow can no longer take in heat from the outside; for a heat pump air conditioner with automatic defrost, the lowest ambient temperature it uses is also minus 5°C, and it can’t heat effectively even below this temperature.

In addition to environmental factors and improper use by the owner, there is another important reason why the air conditioner only cools but does not heat, which is the failure of the refrigeration cycle system and control system, which is mainly reflected in the following A few points:

The reason for only cooling but not heating: insufficient refrigerant

Due to the leakage of the refrigeration system, the refrigerant involved in the thermal cycle in the system is insufficient , Resulting in a drop in heat exchange efficiency, resulting in insufficient heating capacity. If there is such a fault, the system will have insufficient heating and cooling capacity. 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. Then check the pipeline. Obvious oil stains are found, and for minor leaks, an electronic leak detector should be used to detect leaks.

The reason why the air conditioner only refrigerates but not heats: the four-way valve blows air

The heat pump type air conditioner uses the four-way valve to switch the cooling and heating state. In cooling, the outdoor heat exchanger is used as a condenser, and the indoor heat exchanger is used as an evaporator to absorb heat; while in heating, the outdoor heat exchanger is used as an evaporator, and the indoor heat exchanger is used as a condenser to release heat. If the four-way valve is in series, part of the refrigerant that should have participated in the heat exchange is returned directly from the compressor outlet pipe to the return pipe at the four-way valve, resulting in a decrease in the refrigerant participating in the heat exchange and a decrease in the heat exchange efficiency, thus causing Insufficient heating capacity. The external performance is mainly high and low pressure unstable, and the pipes (two heat pipes and two cold pipes connected to the four-way valve) are cold and heat uneven; some faults are similar to insufficient refrigerant or cooling and heating. Both are insufficient, but the pressure on the high-pressure side is normal through testing.

The reason why the air conditioner only cools but does not heat: the one-way valve (also known as the check valve) leaks.

The refrigeration cycle system of the heat pump air conditioner is such as As shown in the attached drawing, heat pump air conditioners are very different in cooling and heating states, and only relying on electromagnetic reversing valves to switch the flow of refrigerant is often unreliable. Therefore, one-way valves are often used in heat pump air conditioners. Safely and effectively switch the direction of refrigerant flow. In the refrigeration cycle, the high and low pressure difference is small, the throttling element is the main capillary tube, and the auxiliary capillary tube is short-circuited by the one-way valve; in the heating cycle, the one-way valve parallel to the auxiliary capillary tube does not conduct, and the throttling element is the main The capillary tube and the auxiliary capillary tube are connected in series, which can increase the resistance of the throttling element, that is, increase the high and low pressure difference of the refrigeration system, reduce the temperature of the outdoor heat exchanger, and obtain more heat from the outside to achieve the purpose of heating. When the one-way valve leaks, the pressure difference between the high and low pressures of the refrigeration system drops, the temperature of the outdoor heat exchanger rises, and the heat obtained from the outside is reduced, resulting in insufficient heating capacity. When there is a failure of normal air-conditioning refrigeration and insufficient heating capacity, by detecting the pressure when the system is running, it will be found that the pressure on the low pressure side rises, and the pressure difference between the high and low pressures drops.

The reason why the air conditioner only cools but does not heat: the defrost controller fails

The evaporator of the heat pump air conditioner is located in the outdoor unit when the heat pump is in the heating state For heat pump type air conditioners using thermal defrosting and defrosting devices, if the defrosting controller fails and the air conditioner cannot be switched to the defrosting state in time, the evaporator will frost during heat pump heating, which will affect the heating of the air conditioner. The heat exchange efficiency leads to insufficient heating capacity and even downtime. At this time, you should focus on observing whether there are the following phenomena: misplacement of defrosting temperature sensing devices, sticky edges or poor contact of the contacts, slippage of the fan impeller or blockage of the air duct, failure of the solenoid valve or the starting relay.

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