Importance of adding antifreeze

When the temperature is below 0℃, antifreeze needs to be added to the machine. Antifreeze can prevent the coolant from freezing in

 the cold winter, bursting the laser and the pipes inside the chiller and damaging the sealing of the pipes. It should be noted that our

 chillers have certain requirements for antifreeze. Wrong selection or improper use will damage the internal pipes of the equipment.

The following requirements are required for selecting antifreeze: good antifreeze performance, corrosion resistance and rust 

resistance, no swelling and erosion performance on rubber sealing conduits, low-temperature viscosity is not too large, and chemical

 properties are stable.

Antifreeze addition ratio

In order to ensure the normal operation of the chiller and laser and prevent machine damage, it is recommended that the proportion

 of antifreeze added should not exceed 30%.

Principle of antifreeze use: the lower the concentration, the better. Most antifreeze is corrosive. Under the condition of meeting the

 antifreeze performance, the lower the concentration, the better. The shorter the use time, the better. When the temperature is 

continuously above 5°C, the antifreeze needs to be completely drained, and the chiller needs to be rinsed with purified water or 

distilled water for multiple cycles, and then replaced with the commonly used purified water or distilled water. It is not advisable to 

mix. Antifreeze of different brands should be avoided to avoid chemical reactions, precipitation or bubbles due to different main 

ingredients or additives.

In order to ensure the normal operation of the chiller, it is recommended to maintain the working environment temperature above 0°C 

to prevent freezing and avoid adverse effects on the equipment. Before restarting the industrial chiller in winter, it is necessary to 

check whether the chiller water circulation system is frozen.

If freezing occurs, first turn off the power supply of the chiller and related equipment to avoid damage to the machine. Subsequently, 

a heater (or small sun) can be used to heat the chiller to help melt the ice layer. When the ice layer is completely melted, the chiller 

can be restarted. During the process, don't forget to carefully check the chiller, external pipes and related equipment to ensure that 

the water circulation pipes are unobstructed. If the ambient temperature is below 0°C, if the user's own conditions allow and there is 

no local power outage, the user can choose not to shut down the chiller at night and keep the chiller running for 24 hours to ensure 

the circulation of cooling water and prevent freezing.

Temperature control settings for fiber laser chillers in winter

Maintenance methods for chillers when shut down in winter

When the ambient temperature is below 0°C and is out of service for a long time, we need to drain the equipment to prevent it from 

freezing and cracking.

Drain cooling water: Open the drain valve at the bottom of the equipment and drain the cooling water completely. When draining the

 inside of the chiller, the inlet and outlet pipes need to be removed, and the water inlet plug and drain valve need to be opened. 

Blow dry the pipes: Use a compressed air gun to blow the water out of the pipes inside the equipment. Note: Do not use an air gun 

to blow air into the joints with yellow sticky notes above/on the side of the inlet and outlet to avoid damage.

Placement treatment

After cleaning and drying the inside and outside of the chiller, it is recommended to temporarily store the equipment in a place that 

does not affect production, and use a clean plastic bag or insulation bag to package the equipment to prevent dust and water vapor 

in the air from entering the equipment.

The best operating environment temperature and humidity for laser equipmentTemperature: 25±3℃Humidity: 80±10%Acceptable 

operating environment temperature and humidity for laser equipmentTemperature: 5-35℃Humidity: 5-85%The operating environment

 of laser equipment in winter should not be lower than 5℃The CWFL series chiller has two cooling water circuits, the low temperature

 end cools the laser, and the high temperature end cools the laser head. In the intelligent temperature control mode, the cooling 

temperature changes with the room temperature and is 2℃ lower than the room temperature. The temperature is low in winter. 

According to the user's cooling water temperature requirements, it is recommended to set the high temperature end temperature 

control mode to constant temperature mode to meet the user's demand for a fixed value of the laser head cooling temperature. 

The user can set it according to the actual situation of the equipment.