How can the air conditioner be cold and hot, and why is the air conditioner cold and hot?

The reasons for the sudden cold and heat during air conditioning refrigeration: 1. The freon is not enough (commonly known as "refrigerant" is not enough), and fluoride needs to be added. If you use an old air conditioner for three to four years, the cooling effect will decrease.

This is because old air conditioners use freon as a refrigerant, which will volatilize after long-term use. Therefore, users only need to add a little to the regular air conditioning maintenance point. In addition, it is not excluded that improper installation can cause freon leakage and problems with the machine itself.

2. If the power supply voltage is not enough, let the power supply company solve it. The normal starting voltage of the air conditioner is 220V+-10%. In China's power supply system with a phase voltage of 220V and a line voltage of 380V, almost all compressors above 200V can be started.

At 180V or more, 70-80 can be started, and at 160V or more, only a few can be started. 3. The air conditioner is not cleaned and maintained for a long time, and the air conditioner needs to be maintained and cleaned. The outdoor unit is exposed to the outdoors, which is easy to absorb dust and debris, and if it is not cleaned for a long time, it will affect the heat dissipation performance of the machine, resulting in the reduction of the refrigeration effect of the air conditioner.

If the indoor unit is not cleaned for a long time, bacteria will grow, pollute the air, and make people sick. 4. The copper pipe connecting the indoor unit and the outdoor unit is too long, which will affect the refrigeration effect. The maximum allowable length of the connecting pipe of the air conditioner shall not exceed 8 meters for one horse, 10 meters for the horse, and 15 meters for more than 2 horses.

The height difference between indoor and outdoor units shall not exceed 5 meters.

Generally, air conditioners are equipped with defrosting circuits:

For heat pump air conditioners in winter heating work, the surface temperature of the evaporator will reach below zero, the surface of the evaporator may be frosted, and the thick frost layer will cause the air flow to be blocked, affecting the heating capacity of the air conditioner, so there is a defrosting circuit on the air conditioner. There are generally two kinds of defrosting circuits, one is to stop the defrost and let the frost melt by itself, which is not feasible when the temperature is low, and the time to melt the frost is longer, and the air conditioner generally does not use this method. The other refers to thermal defrosting, that is, the use of changing the reversing valve to make the evaporator condenser on the indoor side can also be regarded as the meaning of the exchange of internal and external machines to achieve the effect of initial frost.

The defrosting controller is also an electrical switch that uses temperature to control the operation of the contacts.

Micro differential manometer defrosting controller.

It uses a microdifferential manometer to feel the pressure difference between the outdoor unit before and after frost and controls it by itself. The high voltage of the micro differential pressure gauge defrost controller is connected to the air inlet side of the outdoor evaporator surface, and the low pressure is connected to the air outlet side of the outdoor evaporator surface. After the outdoor evaporator frosts, the airflow resistance increases, and the pressure difference between the front and rear changes, so that the defrosting circuit is turned on, so that the electromagnetic power is cut off and the defrosting is turned.

The air conditioner has a cool breeze for a while and a natural breeze for a while depending on whether the compressor works or not, the compressor works to produce a cool breeze, and the compressor does not work for natural wind. When the air conditioner is in natural wind, the compressor is not working, that is, the compressor is shut down. There are several possibilities:

1. The compressor has a large load, the overcurrent protector acts, and the power is cut off and shut down.

2. The main board control fails, and the compressor is started intermittently.

3. The air in the system is not clean, the high pressure is ultra-high, and the high-voltage protector is shut down due to action.

The air conditioner is cool for a while, and the natural wind for a while may be due to:

1. The automatic mode may be turned on, when the set temperature is close to the room temperature, it will stop when the set temperature is reached. It creates the illusion of failure when it is turned on and stops, but there is no problem with the actual air conditioner.

2. The voltage is abnormal and unstable. Compressor overcurrent protection. It is recommended to try a different voltage stabilizing device.

3. The temperature of the indoor coil is too high, resulting in protective shutdown. When the indoor temperature is 26 degrees Celsius and the outdoor temperature is above 20 degrees, the air conditioner cannot heat normally, which is easy to cause protection.

4. The failure of the indoor fan causes no blowing and protects the shutdown. If the outdoor fan fails, causing serious frosting, defrost is carried out, and the indoor air prevention function is entered.

Generally speaking, users will set the temperature of the air conditioner according to the needs of the environment, and some people think that lowering the set temperature can have the effect of saving energy, when the set temperature of the air conditioner is low, the air supply will stop after the air conditioner reaches the set temperature standard, so the air conditioner will shut down. Other reasons are as follows: 1. When using the air conditioner, the air conditioner may be flushed due to improper wind direction setting or other reasons.

Because the heat is rising, it is easy to cause the indoor temperature to not reach the standard, and the air conditioner has its own thermostat, because the temperature around the air conditioner reaches the set standard, so the air conditioner will automatically shut down, but in fact, the indoor temperature does not reach the ideal standard. To avoid such problems, care should be taken to keep the air conditioner baffle down during use. 2. There is another reason why the air conditioner will stop heating for a while in the defrosting work, which is caused by the defrosting of the air conditioner.

When the outdoor temperature is too low, the air conditioner is prone to stop for a while after the heating is turned on, because the outside temperature is too low, the external unit needs to be defrosted in time, and the air conditioner host will automatically defrost after working for a period of time, at this time, the inner machine will not continue to supply air, so the air conditioner will shut down, but after the defrosting work is over, the air conditioner will resume heating, because the heating suspension caused by defrosting is a normal phenomenon. This answer is applicable to most of the air conditioning models of brands such as Midea KFR-26GW N8MJA3 &> Gree KFR-35GW NHA1BAJ.

There may be several reasons why the air conditioner is cold for a while and hot for a while:

1.Unreasonable temperature setting: If the temperature of the air conditioner is set too low or too high, it will cause the air conditioner to be cold for a while and hot for a while. It is recommended to set the temperature within a comfortable range.

2.The air conditioner filter needs to be cleaned: If the air conditioner filter is not cleaned for a long time, it will lead to poor air circulation and affect the cooling effect of the air conditioner.

3.Failure of the outdoor unit of the air conditioner: If the outdoor failure of the air conditioner fails, the cooling effect of the air conditioner will be unstable, and the situation will be cold for a while and hot for a while.

4.Unreasonable position of the indoor unit of the air conditioner: If the position of the indoor unit of the air conditioner is unreasonable, it will lead to poor air circulation and affect the cooling effect of the air conditioner.

5.Insufficient refrigerant of air conditioner: If the refrigerant of air conditioner is insufficient, it will lead to the unstable refrigeration effect of air conditioning, and there will be a situation where it is cold for a while and hot for a while.