In winter, not only do we need to keep warm, as a refrigeration person, we also have to "love and maintain" our refrigeration equipment, especially in the cold north, pay attention to central air conditioning should also do cold measures, especially shopping malls, manufacturing enterprises, hotels and other large fields of commercial central air conditioning more need to antifreeze, so how to antifreeze, antifreeze what measures?

First, the host anti-freeze

Close the inlet and outlet valve of the condenser or evaporator of the main engine, open the water drain valve and air drain valve, and then use compressed air to blow away the remaining water.

Second, the anti-freezing of the water pump

Close the inlet and outlet valve of the coolant pump, open the drainage valve and vent valve of the pump, and drain the water. Open the lowest point valve of the cooling water system, discharge the cooling water, and open the water discharge valve of the pump. After the system water is discharged, in order to prevent rainwater from entering through the cooling tower, close the main outlet valve of the cooling tower and open the sewage valve of the cooling tower water collection tray, so that the rainwater can be discharged from the sewage valve in time.

Three, cooling tower water supply pipe antifreeze

In general, the cooling tower water refill pipe is exposed to the outside, and most designers use the insulation method to prevent freezing, but in the actual use process, even if the insulation is often frozen.

In order to solve this problem, when the cooling tower water refill pipe is connected from the room, a valve is added, and a water discharge valve is added at the lowest point of the water refill pipe. (This article comes from the refrigeration encyclopedia public number) When winter comes, the indoor valve is closed, and the lowest water discharge valve is opened, and the water in the outdoor pipe is drained, so that the pipe does not need insulation and will not be frozen.

Fourth, antifreeze of expansion tank

The expansion tank is generally located on the roof or the top of the equipment room, although the expansion tank appearance has insulation, and a circulation pipe, but in actual use, the circulation pipe can really play a circulation role is very little, that is, in the winter there is a long-term expansion of the water in the expansion tank in a low temperature environment, although the heat preservation but will still be frozen, the expansion tank is frozen can not expand, the temperature in the system increases, the pressure increases.

In order to solve this problem, a DN20 interface can be set up in the air conditioning water supply main pipe during construction, and a valve can be properly opened to ensure that the water in the water tank is circulated. (This article is from the refrigeration encyclopedia wechat public number) If the air conditioner is not used at night, the valve can be fully opened before the pump stops, so that the water temperature in the expansion tank will rise, and the expansion tank will not freeze for a long time after the pump is stopped.

Five, fresh air system antifreeze

The role of the fresh air unit is to send the outdoor fresh air into the room after treatment, in winter, the fresh air unit heating outdoor cold air, that is, the fresh air unit surface cooler directly in contact with the outside cold air, in order to prevent the surface cooler from freezing when the heating is stopped, the electric multi-leaf regulating valve should be added at the entrance of the fresh air, and the fresh air unit linkage. When the fresh air unit is running, the air valve is opened, and when the fresh air organ is closed, the air valve is closed, which can prevent the fresh air unit and the refrigerant water pump from stopping operation, the outdoor cold air will directly cool the water in the surface cooler, make the water freeze, and freeze the surface cooler.

Six, add antifreeze

In winter, when the unit is not convenient to drain water and drain water and power may be cut off, the equipment heating must be supplemented with antifreeze, and the local minimum temperature must be used as an important parameter for selecting antifreeze.

The main component of antifreeze is glycol, antifreeze from the water tank into, the water system after the discharge of frozen water, the first injection of antifreeze stock, not enough to inject frozen water, and then open the pump to make the antifreeze and water fully integrated, by the way, the water system can not have air, air will make air conditioning equipment report water flow switch protection, It is also easy to form cavitation.

7. All refrigeration pipes are insulated

The main purpose of chilled water pipe insulation is to prevent condensation on the outside of the pipeline, and another role is to prevent the water in the pipeline from freezing, and the thickness of the insulation layer is generally more than 20mm.

In addition, but also in the outer side of the water pipe around the electric companion tropical, as long as the companion tropical power supply, it can continue to heat the pipeline, is the water temperature in the pipeline above 10 ° C, coupled with the heat preservation outside the tropical, there will be no ice caused by the water heater water shortage protection. With the tropical zone to choose a temperature limiter, maintain a certain temperature on it.