Why doesn t the air conditioner defrost? Does not defrost affect heating?

General 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 defrosting.

The defrost controller is also an electric switch that uses temperature control contact action, and it is a special thermostat for removing the frost layer of the heat exchanger coil of the outdoor unit during heat pump heating. Its defrosting mode is generally reverse circulation ring thermal defrosting, that is, through the contact of the defrosting controller switch, so that the electromagnetic reversing valve reversing to achieve the effect of defrosting.

Conditions of entry. 1.When entering the heating mode or defrosting mode for about 5 minutes, the judgment time is 3 minutes according to the maximum difference between the temperature of the outer coil unit and the indoor temperature.

When the difference between the inner coil temperature and the room temperature decreases by more than 5 degrees and lasts for more than 3 minutes, the accumulated working time of the compressor is ensured to be more than 45 minutes, and the indoor coil temperature is less than 48 degrees, and these 4 are met at the same time, it will begin to enter the defrost.

2.If the compressor runs for more than 45 minutes and runs continuously for more than 20 minutes, the coil temperature is less than 16 degrees Celsius in the room temperature for 5 minutes, and it will enter the defrosting state.

3.If the compressor runs for more than 3 hours and continuously runs for more than 20 minutes, the coil temperature is less than the room temperature of 16 degrees Celsius, and it enters the defrosting state for 5 minutes.

4.If the external fan enters the overload protection and the external fan stops, the continuous operation time of the external fan is greater than 10 minutes when the external fan is started next time, and the cumulative running time of the compressor is more than 45 minutes or 20 minutes of continuous rotation for 20 minutes, the indoor coil temperature is less than 48 degrees, and the defrosting state is entered.

There are several possible strips of the Lai Gang head.

1. The ambient temperature is too low, which makes it difficult to defrost the air conditioner; Strip Lai Piercing Head.

2. Defrost sensor failure; Lai Yan headlines.

3. The lack of fluorine in the system leads to insufficient defrosting heat; Toutoutiaolai.

4. The control board is faulty, and the air conditioner does not defrost at all. Air conditioner defrost is a function of the air conditioner, which is activated only when it is heated. Cause of frosting:

In the heating mode, the air conditioner blows cold air, and the heat exchanger temperature is a few degrees below zero or 10 degrees, at this time, the water vapor in the outside air will condense on the fins of the outside unit, and then be frozen into ice cubes. Frosting hazards: If the external unit is not defrosted, the external machine is blocked by the ice cubes, unable to dissipate heat, the ice cubes are getting thicker and thicker, and finally the refrigerant in the external machine cannot evaporate, the pressure is too low, the system jumps low pressure protection, and the machine stops.

Defrosting principle: after reaching certain conditions (each air conditioner has been set: such as the fin temperature is lower than the ambient temperature x ° and lasts x minutes), start defrosting, at this time the system changes to refrigeration mode, the four-way valve will interchange the functions of the internal and external machine, the refrigerant in the external machine is high temperature and high pressure freon, melt the ice cubes, and the defrost will end after reaching the set conditions (the manufacturer has set it, generally the temperature of the outer fin reaches x °), and replace it with the refrigeration mode.

Normal heating without defrosting is a problem with the temperature sensor and related plugs of the outdoor unit coil (defrosting).

Observe the outdoor temperature, if it is lower than the required temperature of the air conditioner (below -5), it will cause too much frost on the condenser, resulting in incomplete defrosting. The air conditioner should only be used when the ambient temperature outside meets the requirements.

If the outdoor coil temperature sensor and its plug are checked properly, the outdoor coil sensor plug and associated resistance of the indoor control board should be checked.

Ask questions, and the outside machine does not turn in circles.

2.Is the voltage relatively low, to ensure that the voltage at home is not low in order to maintain the heating of the air conditioner, because the voltage is too low to play any heating role.

3.Whether the host is broken, open the window, listen to whether the outdoor air conditioner host is working, if there is a booming sound, it means that there is no problem with the external unit.

4.It may also be because the outside temperature is too low, it takes 10 minutes to start working after turning on the air conditioner, and it generally takes a process for the air conditioner to be heated.

5.If the above conditions are discharged, it must be the internal parts of the air conditioner that are damaged and the heating function cannot be operated, and it is best to find an air conditioner maintenance personnel for maintenance and inspection.

The difference in humidity in various regions, the defrosting without condensate during air conditioning heating is related to the ambient humidity, and the size of the user's use area is related to the size of the air conditioner.

No, you don't.

The current air conditioners are all intelligent frost, and the air conditioners themselves have their own defrosting control program logic. Even if there is a lot of snow or residual frost on the heat exchanger of the outdoor unit of the air conditioner before the heating is turned on, the air conditioner can melt the frost according to its own judgment.

And when the air conditioning system is abnormal, even if the snow or frost is melted away first, it will be covered with frost soon after turning it on.

The air conditioner is not defrosted according to the operating parameters set by the air conditioning system itself. After years of technology accumulation and precipitation, the application of air conditioning and refrigeration heating has already achieved intelligent control for defrosting, and the technical differences of different manufacturers are more in the premise of ensuring the safety of the normal defrosting system, how to achieve more energy saving, that is, the lowest power consumption.

Heating frosting is generally located on the evaporator of the outdoor unit, when the heating mode is turned on, the outdoor unit absorbs heat and the indoor unit dissipates heat.

When the outdoor unit still needs to absorb heat, the temperature of the evaporator body will drop to below 0 degrees, and the surrounding moisture will be similar to the dehumidification during refrigeration, and it will soon condense into frost.

Treatment plan: This is a normal phenomenon, the air conditioner itself has the function of outdoor defrosting, when the temperature and time reach the set standard, it will automatically defrost, and the problem of frosting can be automatically solved.

The defrosting of the air conditioner is a matter of the outdoor unit, the room temperature is relatively low in winter, the heat should be obtained from the low temperature when heating, the temperature of the evaporator of the outdoor unit is lower, it is easy to absorb the moisture in the air and frost, the frost is thick, it affects the heat exchange of the evaporator, so that the air conditioner can not heat, and then the defrosting is needed.

If the air energy heat pump is not defrosted in time, it will cause the frost to become thicker and thicker, and the capacity of hot water will also be greatly reduced, and there may be ice in the evaporator of the unit instead of frost, which may lead to direct production of hot water, and in serious cases, it will also lead to direct shutdown of the unit, so the air source heat pump air conditioning defrosting must be timely, and the frosting of the unit must be closely observed to ensure the normal operation of the unit.

The air conditioner will only be defrosted when it is heating in winter, because the temperature of the temperature exchanger of the outdoor unit is very low, frost will occur, and the frost will affect the ventilation and hinder the temperature exchange, so it must be defrosted to ensure the normal heating of the air conditioner.

In fact, the defrosting work of the air conditioner is to switch the circulating flow direction of the refrigerant through the four-way valve, so that the air conditioner is converted from the heating working state to the refrigeration working state, but the indoor unit fan does not work. In this way, the temperature of the temperature exchanger of the outdoor unit is very high, so that the frost melts away quickly. The indoor unit does not work because the temperature of the indoor unit temperature exchanger is very low when the refrigeration is working, so that the indoor temperature will not be reduced.

After the air conditioner is defrosted, it will automatically switch to heating mode.

Air conditioner defrosting is due to the presence of water vapor in the air around the outdoor unit when the air conditioner is running in winter heating mode.

If there is no water vapor in the surrounding air at this time, the outdoor unit will not frost when the air conditioner is heating, and there will be no frosting action. Of course, this is the ideal situation.

From the working principle of the air conditioner, if the heating mode of the air conditioner is running in winter, the surface of the heat exchanger of the outdoor unit is seriously frosted, or even frozen, and the air conditioner does not melt, the heating capacity of the air conditioner itself will become very poor, and the heating effect will be seriously deteriorated.

If the icing and frost are too severe, it may cause liquid shock to the air conditioner compressor and cause complete damage. Therefore, the air conditioning unit must be defrosted regularly during actual use to ensure that the air conditioning system can operate safely and normally and has a good heating effect.

The current air conditioner enters the defrosting state according to the following conditions:

1. Detect the temperature of the evaporator coil in the room for a certain period of time, lower than a temperature for a certain period of time, 2. Defrost once for 45 minutes to 90 minutes for continuous heating.

3. Detect that the temperature of the condenser of the outdoor unit is lower than a temperature for a period of time, and many manufacturers' machines decide whether to defrost according to these three points, that is to say, they will be defrosted at least once an hour.

If your air conditioner is heating normally, but the defrosting frequency is relatively high, you should see if the outdoor temperature is too low and the outdoor humidity is too high (especially in rain, snow and fog).

If the heating effect is not very good, a small amount of fluorine deficiency can also cause continuous defrosting.

If you don't defrost the air conditioner, it will reduce the service life of the air conditioner because of the previous ice slag, and to a large extent, let the users who use the air conditioner lose their benefits, so we need to defrost the air conditioner from time to time, so that the air conditioner can serve us well.

If you don't defrost it, it will cause you financial damage because of the ice slag inside the air conditioner, which will reduce the life of the machine.

Not all air conditioners have to be defrosted. There are two main types of air conditioners. The first type is a single cooling air conditioner, and the second type is a cooling and heating air conditioner.

Single-cooling air conditioners do not need to be defrosted, because it only turns on refrigeration, no need to defrost, and air conditioners are generally purchased and installed in Guangdong.

Heating and cooling air conditioners will involve the problem of defrosting. The main occurrence of defrosting is in the winter when the air conditioner is used for heating. In winter, the internal unit is heating, but the air conditioner is actually cooling, because the outside temperature is very low, and the air conditioner will freeze when the external machine is cold.

If the air conditioner does not defrost, the ice outside will become thicker and thicker, and it will also affect the heating effect of the air conditioner. So generally speaking, the air conditioner will melt once after about 45 minutes of turning it on. The defrosting time is ten to 15 minutes.

This is for the air conditioner to have a better heating effect.

After the temperature of the heating system is raised, the high wind speed promotes the circulation of hot air in the room, which can avoid excessive temperature difference in the room caused by local heating and avoid the uncomfortable feeling of the human body.

Generally, it includes cold source and heat source equipment, cold and hot medium transmission and distribution systems, terminal devices and other large imitation parts and other auxiliary equipment. It mainly includes refrigeration hosts, pumps, fans and piping systems. The terminal device is responsible for using the cold and heat from the transmission and distribution to specifically treat the air state and make the air parameters of the target environment meet certain requirements.

Because when the air conditioner is heating, the outdoor unit condenser is always in a low temperature state. And in addition to the outdoor gas, there is also the exchange from the interior. Therefore, if we look closely, we will find that when the air conditioner is heating, there will be frost accumulation in the outdoor unit condensation and hail, so it needs to be defrosted.

When the frost of the outdoor condenser accumulates to a certain extent, the frost will block the outdoor condenser in the room, so the air conditioner will defrost frequently when heating to ensure the normal heat exchange of the air conditioner.