The temperature is dropping rapidly, and the air heat pump should be well protected against freezing in winter.

In the past few days, there has been a violent snowfall in many parts of the country. There is no need to say much about the low-temperature areas in the north, and even the provinces along the Yangtze River, such as Zhejiang and Jiangsu, have extremely rare snow. Snowy, the scenery is natural and beautiful, let the people of the South feast their eyes. However, the accompanying low temperature weather has also caused trouble, and the air heat pump winter freeze protection work is particularly important.

First, the air energy heat pump users pay attention to two points in winter

1, the host should not be powered off.

In the use of air source heat pump heating is mostly when the temperature is low at night, the daytime temperature is high or not at home, some users may turn off the host in order to save power. This is actually very dangerous because the heat generated by the air source heat pump unit is heat transferred by the water carrier. If the power is turned off when used in a low temperature environment, the host is likely to be frozen.

The correct method should be to set the set temperature of the unit to low when the main machine is not needed, so that the unit can guarantee the antifreeze function, so that the energy waste and the unit antifreeze problem can be effectively solved.

After a long period of passive power outage, the user should open the joint and the valve at this time to drain the water in the pipe. In this way, even if the power is cut off, you can avoid freezing the pipe and the host because of the low temperature.

2, do not accumulate debris around the host

Air source heat pump heating is to absorb the heat in the air, and then vaporized by the evaporator, compressed into high pressure gas by the compressor, and then liquefied into the condenser, the absorbed heat is transferred to the heated water, so reciprocating, continuously absorbing the low temperature source Heat and output the heated water to directly reach the predetermined temperature. If there are debris around the host and the distance is close, it will definitely affect the heat transfer effect. In general, there is at least a distance of 80 cm around the main unit.

The ventilation of the installation position is not good, it will affect the heating effect of the machine. Therefore, it is necessary to pay attention to cleaning more. It should also be noted that the main fan blows out the cold air. If there is debris blocking in front, it will affect the cooling of the cold air. This will result in insufficient heat in the air, affecting the heat transfer effect. Therefore, the fan front is good for 2 meters, there is no barrier, too close may also send the cold air back to the host, so the heating effect is very low.

Second, air energy heat pump case analysis

Case 1: There is a villa user who does not live in the house. When he went abroad for vacation last winter, he broke all the electricity and did not drain. After the return, the machine was completely frozen.

Analysis: In the north, the temperature in the north is low, and the inner plate of the unit is frozen, and the system is scrapped after the machine is turned on. At this time, do not start the machine first, first make ice, put the water out, then cut off the water side heat exchanger, weld it with the welding torch first, disconnect the heat exchanger system and other systems first, then use nitrogen to blow other systems. There is no water. If there is water, it must be blown dry or exposed to the sun to ensure that there is no water inside. Then open the compressor. If it can be opened, there is no problem. Just replace the heat exchanger, if it is in the heat exchanger system. If the compressor is turned on without disconnecting, it is very likely that the compressor will enter the water, and the entire system will be scrapped.

Solution: There is also a way to cope with this situation, that is, install an automatic valve that automatically opens and drains water when the power is turned off. It is not expensive to install an automatic valve. It is only about 200 yuan for a good point. However, this valve has a limitation. It is to be installed in the low position of the pipe. Sometimes it is difficult to find the low point of the zui, especially when the end is warm. .

Case 2: In a rural area, the machine was frozen in the winter, and the engineer was asked to repair it in the past.

Analysis: The temperature in winter is very low. If the antifreeze is not good, it is easy to be frozen. When the temperature is lower than 0 °C, the water will freeze. When the water freezes, the volume will expand, and the expansion coefficient of the pipe and water will be different. Therefore, when the water temperature in the pipe is lower than 0 °C, the pipe may freeze, when the environment The internal frost protection fails when the temperature is below 0 °C and the unit is not energized or the unit is in standby. There is also a situation of power outages, and there are more power outages in rural areas in the north. When the ambient temperature is low, more than 2 hours is more dangerous, but the owners generally do not tell you that they are powered off.

Solution: In this case, we usually remove the heat exchanger of the machine and test it to the heat exchanger manufacturer to see the shape of the casing and the heat exchanger. If it is cracked, the shape of the deformation is different. Water is generally caused by power failure, and there will be rust spots inside. The solution steps are similar to those of Case 1. You must first release the ice and drain the water before drying.

Case 3: Frozen in a two-unit supply unit during summer cooling.

Analysis: If the temperature probe fails or is inserted incorrectly during cooling, the machine will be frozen. Generally, the temperature we set is 12 ° C, and the water temperature is 7 ° C. If the temperature is not correct, it is possible to achieve the effect. The main unit has been cooling, resulting in ice formation. Or the water flow is not smooth, the temperature probe is placed on the pipe, the temperature of the pipe is high, and the plate will be cooled and will be frozen, especially if there is a buffer tank, the temperature probe is inside the water tank. The water in the water tank does not flow, and the temperature is relatively high. When the board is replaced there, it will freeze when it is cooled, and the anti-freeze performance of the board change is even worse, and it is easier to freeze.

Solution: In case of poor water flow, we usually install a water flow switch to detect the flow of water. If the water flow is not smooth, the machine will automatically stop working.

Hongxing air energy heat pump unit operates normally at -25°C

Third, what are the common air energy heat pump antifreeze measures?

1. If the set water tank temperature is 45 ° C or 55 ° C, when the water tank temperature reaches this temperature value, the host will stop working. If the end does not work, then the pipe temperature will drop, when the temperature is too low, say 3 °C, at this time, the main control panel can automatically start the circulating water pump according to the set temperature value (3 °C) to ensure that the pipeline will not freeze due to low temperature.

However, this method has a disadvantage. When the position of the temperature probe is not very good, the accuracy will be problematic. There is also an electronic product like a temperature probe, sometimes there will be a malfunction, the measured temperature and The actual temperature is different, and a false positive will occur at this time. In addition, this method will not work when the power is off.

2. Use antifreeze. Before the arrival of winter, agents should remind customers to pay attention to antifreeze, but sometimes customers will not pay attention. Therefore, sometimes we will advise customers to use antifreeze.

But antifreeze also has its shortcomings: first, his specific heat capacity is lower than that of water, and the heat is less in the same volume. The wind blown out by the wind disk is smaller or the temperature of the floor heating is lower, and the antifreeze heat is also faster. It may also have a certain impact on the heating effect.

3. Use electric heating cable.

This is done when the solar energy is used in the north. When the ambient temperature is low or the machine stops working, the electric heating cable is started, and when the pipe temperature reaches a certain value, the power is automatically turned off. Of course, this method also has limitations that power outages cannot be used.

NINGBO MEDICAL EQUIPMENT CO.,LTD , https://www.techartmeds.com