Pay attention to freeze protection
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The temperature is getting cooler, in order to ensure the normal use of the first air conditioning host, terminal and other equipment and systems, it will be sent to you"Winter Air Conditioning Unit Antifreeze Manual".Remember to do a good job of antifreeze for the unit!
part.1
Host device
Do not use the equipment for a long time in winter
In order to prevent the unit from freezing and breaking, please putChilled water and cooling water are all drained
In winter, air equipment is used
Please noteThe equipment operates at low load, please ensure that it is stopped at light loadThe circulating pumps of each system run continuously
RecommendationsAdd antifreezeto avoid freezing damage to the unit in the event of a sudden power failure.
Screw chillers
part.2
Cooling towers
In general, the water supply pipe of the cooling tower is exposed to the outdoors, and most of the designers use the insulation method to prevent freezing, but in the actual use process, even if the insulation is insulated, freeze damage often occurs. It is necessary to increase daily inspection and maintenance
Do not use the equipment for a long time in winter
Must in the event of downtimeDrain the circulating water and spray water, and keep the drain valve and drain port open；When the lower sink has an antifreeze heater, please put itThe heater power is cut offto prevent fire from dry burning;Closed cooling tower heat exchangerAfter natural draining, it is necessary to further use compressed air to drain the water and keep the drain valve open
Use the equipment in winter
Please pay attention to the icing of the cooling tower bodyIf there is ice, please clean it up in time
When the cooling tower fan is running intermittently, please pay attention to check the ice layer on the inside of the air duct, and if there is ice, please remove it completely before starting the fan
It is recommended to add antifreeze to the circulating water during the operation of the closed cooling tower in winter to avoid damage to the heat exchanger caused by not draining the water in time after the shutdown.
part.3
Air conditioner ends
Do not use the equipment for a long time in winter
Air conditioning system and terminal equipmentThe stored water needs to be drained cleanly；If there isThe equipment where the fresh air is introduced needs to close the fresh air valve
The function of the fresh air unit is to send the outdoor fresh air into each room after treatment, and the fresh air unit heats the outdoor cold air in winter, that is, the surface cooler of the fresh air unit is directly in contact with the outside cold air, and the customer should pay attention to the anti-freezing problem of the fresh air unit.
In order to prevent the surface cooler from being frozen when the heating is stopped, an electric multi-leaf control valve should be added at the inlet of the fresh air, and it should be linked with the fresh air unit. When the fresh air unit is running, the air valve is opened, and when the new fan is closed, the air valve is closed, which can prevent the outdoor cold air from directly cooling the water in the surface cooler after the fresh air unit water pump stops running, so that the water freezes and freezes the surface cooler. If the fresh air valve is very close to the unit, it is recommended to drain the circulating water in the equipment or turn on the water pump to prevent freezing. ）
Use the equipment in winter
Special attention is paid to the period of night shutdown at low temperaturesThe pump must be kept running 24 hours a day(or other antifreeze-related pump interlocking measures),The valves of the water pipeline are all opened, the damper is closed, and the doors and windows of the place where the unit is located are closed.
part.4
Water pump freeze protection
1.Water system pipelines, open the water discharge valve and exhaust valve of the pump set, auxiliary equipment and machine room pipeline. Drain the cold water and cooling water pipelines cleanly, keep the drain valve open, and close the gate valve before and after the water is discharged.
2.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 collection tray so that the rainwater can be discharged from the sewage valve in time.
part.5
Add antifreeze
In winter, the unit is inconvenient to drain the water and there may be a water and power outage, and the equipment must add antifreeze for heating, and it mustThe local minimum temperature is used as an important parameter for the selection of antifreeze
part.6
Insulation of frozen pipes
The main purpose of chilled water pipe insulation is to prevent condensation on the outside of the pipeline, and another function is to prevent the water in the pipe from freezing, and the thickness of the insulation layer is generally more than 20mm.
In addition, it is necessary to wrap the electric heat trace on the outside of the water pipe, as long as the heat trace is supplied with power, it can continue to heat the pipeline, the water temperature in the pipe is above 10, plus the insulation on the outside of the heat tracing, there will be no water shortage protection of the water heater due to freezing. The heat tracing should be selected with a thermostat, and it is enough to maintain a certain temperature.
part.7
Equipment discharge point
The location where the equipment needs to discharge water is shown in the figurePlease be sure to open them allNothing is missing.
Ceiling-mounted air-conditioning units and combined air-conditioning units
The water discharge port and exhaust port are reserved at the water inlet and outlet interface of the unit, and the top air outlet should be opened at the same time for draining
Water-cooled main unit
1. The water discharge point of the cooling section of the unit.
2. The discharge point in front of the pump (there is one in front of each pump).
3. Water pump discharge point (there is in front of each water pump).
4. The water discharge point of the evaporator end cover.
The water outlet and exhaust port are reserved at the water inlet and outlet interface of the evaporator, and the top air outlet should be opened at the same time for draining).
5. The water discharge point of the condenser end cover.
Reserve the water discharge port and exhaust port at the water inlet and outlet interface of the condenser, and open the top air outlet at the same time for draining).
6. The water discharge point of the evaporator of the module machine.