Are central air conditioners afraid of cold in winter?

Are central air conditioners afraid of cold in winter? The following air-conditioning maintenance company will analyze and explain for you;

Antifreeze of main engine and water pump

When the temperature in the main engine room is lower than 0℃ in winter, anti-freezing measures shall be taken for the main engine, refrigerant water pump and cooling water pump.

1. Anti-freezing of the host: close the inlet and outlet valves of the condenser and evaporator of the host, open the drain valve and the vent valve, and then use compressed air to blow off the remaining water.

2. Anti-freezing of the water pump: close the inlet and outlet valve of the refrigerant water pump, open the drain valve and vent valve of the water pump, and drain the clean water. Open the lower valve of the cooling water system, drain the cooling water, and open the water pump drain valve. After the system water is drained, in order to prevent rainwater from entering through the cooling tower, close the cooling tower water main valve and open the cooling tower water tray to drain Valve, so that rainwater can be drained from the drain valve in time.

Antifreeze of cooling tower water supply pipe

In general, cooling tower water supply pipes are exposed outdoors, and most designers use heat preservation methods to prevent freezing. However, in actual use, even if heat preservation, frost damage often occurs. In order to solve this problem, when the cooling tower water supply pipe is connected from the room, a valve is added, and a drain valve is added at the low point of the water supply pipe. When winter comes, close the indoor valve and open the low-point drain valve to drain the water in the outdoor pipe, so that the pipe does not need to be insulated and will not be cracked by freezing.

Antifreeze of fresh air unit

The function of the fresh air unit is to process the outdoor fresh air and send it into each room. In winter, the fresh air unit heats the outdoor cold air, that is, the surface cooler of the fresh air unit directly contacts the outside cold air, in order to prevent the surface cooler from being frozen when the heating is stopped. , An electric multi-blade control valve should be added at the fresh air inlet and linked with the fresh air unit. When the fresh air unit is running, the air valve is opened, and when the fresh fan is closed, the air valve is closed. This can prevent the fresh air unit and the refrigerant water pump from stopping. The outdoor cold air directly cools the water in the surface cooler, which freezes the water and damages the surface cooler.

Before turning on the fresh air unit in winter, check whether the water in the system is flowing and the temperature is appropriate. If the water pump is not running, the fresh air unit cannot be turned on. If the water pump is running but the water temperature is low, the fresh air unit cannot be turned on.

Antifreeze of expansion tank

Expansion water tanks are generally located in the equipment room on the roof or the top floor. Although the outer surface of the expansion water tank is insulated and equipped with a circulation pipe, in actual use, the circulation pipe can circulate very little, that is, there is water in the expansion tank in winter. In a long-term low temperature environment, it will be frozen despite the heat preservation. If the expansion tank is frozen, it will not expand. When the temperature in the system rises, the pressure increases. In order to solve this problem, a DN20 interface can be installed in the air-conditioning water supply main pipe during construction, and a valve can be properly opened to ensure the water circulation in the water tank. If the air conditioner is not used at night, the valve can be fully opened before the water pump is stopped to increase the temperature of the water in the expansion tank, which can keep the expansion tank from freezing for a long time after stopping the pump.

Antifreeze during long holidays

During the Spring Festival or weekends, the temperature is low, and some parts of the bromine chiller water system may be below 0°C for a long time, which may be frozen. Therefore, the management personnel are required to turn on the water pump and increase the temperature of the water in the system according to the actual situation. Ensure that the water system is not damaged by freezing.

in conclusion

Shanghai Decoration Design Company believes that in northern China, the temperature is low in winter, and the water system is prone to frost damage. Firstly, designers should consider this problem and add anti-freezing facilities to the system; secondly, manage the staff of the bromine chiller unit It is necessary to understand the central air-conditioning system of the entire bromine cooler, find out the easy-to-freeze parts, and take precautions in advance. Once again, the operator should continuously improve the professional technical level and strictly follow the operating procedures.