Fourteen why air conditioning maintenance must know

Whether answering a phone call in a repair center or in air conditioning repair work, some customers often ask "Why does the air conditioner outdoor leak water?", "Why is the outdoor unit noisy?", "Why can't it be restarted immediately after shutting down?", "What is electric assisted heating, and should I consume electricity?", "Why does the air conditioner blow out a peculiar wind?" How much do you know about these questions, and how much can you answer? If none of these can be answered, then Your job is too incompetent. If you want to know, just look at the air-conditioning maintenance company below and you will understand.

Why does the air conditioner suddenly heat up when it is cooling?

answer:

A. In the case of extremely hot weather, when the air conditioner reaches or approaches the set temperature, the compressor stops, the fan of the outdoor unit is rotating, and the indoor unit sends natural wind. Because of the high outdoor temperature, the wind is felt when the natural wind is sent Hot air, users are advised to watch the air-conditioning system is not cooling for a few minutes;

B. Ask what mode the user adjusts. If it is an automatic mode, the air conditioner set temperature is higher than the room temperature, and the air conditioner cools. If it is lower than the room temperature, the air conditioner will heat;

C. If there is no above situation, let the maintenance personnel come to check.

Why is the outdoor unit noisy?

answer:

A. Whether the screw of the outdoor unit is loose, whether the wall is aging, whether the noise is the resonance of the large glass of the window, the pipe is bent and flat, the dynamic balance of the outdoor fan is not good, whether there is any problem with the quality of the press, etc.

B. Whether the axial flow fan, fan blades and compressor are equipped with sound insulation cotton.

C. The air duct design of the whole machine.

D. The refrigerant flow of the refrigeration system, the piping design of the refrigeration system, the resonance of the rear network, etc.

Why does the outdoor machine drip during refrigeration?

answer:

During refrigeration, the internal machine condensed water flows out through the pipe, but the temperature at the high pressure end of the compressor is very low, and the hot air in the room condenses into water when it contacts the cold pipe, which is a normal phenomenon.

Why does the air conditioner sometimes blow out mist when it is cooling? Is it normal?

answer:

When the indoor temperature and humidity are high, the air conditioner will blow out mist. This is caused by the cooling of water vapor in the air. When the indoor temperature and humidity decrease, the fog will disappear. This is normal.

Why does the air conditioner leak outside?

answer:

1) If it drips from the high and low pressure valve, it is a drop of condensation, which is a normal phenomenon.

2) Water leakage during heating and defrosting is normal.

 If it is not the above two cases, it may be:

3) The heat preservation of the connecting pipe of the external machine is not in place, resulting in poor heat preservation and dew condensation.

4) Too much refrigerant in the system causes frosting and water leakage in the liquid storage tank.

Why can't it restart immediately after shutting down?

answer:

The air conditioner must be turned off after 3 minutes, and the protection timer will automatically work to protect the main components of the air conditioner from damage.

 If the user's air conditioner has been running well, it cannot be started after a sudden power failure or other reasons?

answer:

We can ask the user to remove the power plug (turn off the air switch) and plug it in again. If the air conditioner can be started, we don't need to arrange for on-site maintenance. (Usually this is an electronic control reset failure) The user reported that several lights of the air conditioner flashed and no operation could be performed.

 answer:

Explain two possibilities:

A. Unstable voltage and compressor over-current protection; users can solve it by themselves, and it is recommended that users get the power and then turn on the power;

 B. When an operation is invalid, the air conditioner may be faulty, and a maintenance person needs to come to deal with it.

Why does the old lamp run when the power is turned on? Why sometimes it flashes and sometimes it does not flash?

answer:

Designed as a standby indication state, a flashing frequency of 1Hz is normal. The reason for the non-flashing may be interference, such as electromagnetic wave interference, infrared interference, etc., such as mobile phones and fluorescent lamp rectifiers.

Why does the sound of wind fluctuate when I choose the ‘auto’ mode?

answer:

The automatic operation will change the mode and wind speed according to the set temperature and the current indoor temperature sensed by the machine, so the sound will also change when the wind speed changes.

What is electric auxiliary heating, and should it consume electricity?

answer:

Explanation: In the case of air conditioner heating, when the compressor has poor heating effect at low temperature or can't make heating when it is stopped, the indoor electric auxiliary heating is started to assist the heat pump heating to achieve better results. Electric auxiliary heating will consume electricity at the beginning, and the energy is conserved. How much heat is generated, how much electricity will be consumed. Midea uses a polymer electric auxiliary heating device, which has a high utilization rate of electric energy. Once it reaches normal heating, the electric auxiliary heating is automatically turned off. Moreover, the electric auxiliary heating is an independent operation key. You can choose 

whether to turn on or not.

The fan does not turn, the reason for the boot protection?answer:

It is possible that the air conditioner shaft is stuck, partly because the air humidity is high, and there are also air conditioners that produce condensed water from cooling or dehumidification, which flows into the motor bearing along the motor line, causing the fan to rust.

What are the main differences between an air conditioner using R410A new refrigerant and an air conditioner using R22 refrigerant?

answer: 

A. Different refrigerants (R410A);

B. The selected compressor is different, it is a new refrigerant compressor (dedicated);

C. The new refrigerant R410A air conditioner has a filter drier, while the air conditioner using R22 refrigerant generally does not have a filter drier.

D. Although the two devices and system piping in the new refrigerant R410A air conditioner are no different from the air conditioner using R22 in appearance, its manufacturing process is more demanding, and the water content and impurity content in the system are higher than those of the air conditioner using R22. Low, and high pressure resistance.

Why does the air conditioner blow out the smelly wind?

Shanghai Decoration Design tells you that when some users are using the air conditioner, they react to the new machine or the machine after a period of time, and there is a peculiar smell blowing out when it is turned on and running.