1. Excessive refrigerant charge. This situation generally occurs after maintenance, and it is manifested as high suction and discharge pressure and balance pressure, and the compressor operating current is also high.

Solution: The refrigerant should be discharged according to the suction and discharge pressure and the balance pressure and the operating current under the rated conditions until it is normal.

2. The cooling water temperature is too high and the condensing effect is poor. The rated working conditions of the cooling water required by the chiller are between 30 and 35. High water temperature and poor heat dissipation will inevitably lead to high condensing pressure. This phenomenon often occurs in high temperature seasons.

Solution: The reason for the high water temperature may be the failure of the cooling tower, such as the fan is not turned on or even reversed, the water distributor does not turn, it is manifested as the cooling water temperature is very high, and it rises rapidly; the outside temperature is high, the water path is short, and it can be circulated In this case, the cooling water temperature is generally maintained at a relatively high level, which can be solved by increasing the storage tank.

3. The cooling water flow is insufficient, and the rated water flow cannot be reached. The main performance is that the pressure difference between the inlet and outlet water of the unit becomes smaller (compared with the pressure difference at the beginning of the system's operation), and the temperature difference becomes larger.

Solution: The pipeline filter is clogged or the selection is too fine, and the water permeability is limited. Choose a suitable filter and clean the filter regularly; or the water pump is small and does not match the system.

4. The condenser is fouled or blocked. Condensate water generally uses tap water, it is easy to scale when it is above 30, and because the cooling tower is open, it is directly exposed to the air, dust and foreign matter can easily enter the cooling water system, causing the condenser to be dirty and blocking, and the heat exchange area is small. The efficiency is low, and it also affects the water flow. The performance is that the pressure difference and temperature difference between the inlet and outlet water of the unit become larger, the upper and lower temperatures of the condenser are very high when the condenser is touched by hand, and the condenser outlet copper pipe is hot.

Solution: The unit should be backwashed regularly, and chemical cleaning and descaling should be carried out if necessary.

5. False alarms caused by electrical faults. Because the high-voltage protection relay is damp, poorly contacted or damaged, the unit electronic board is damp or damaged, and the communication failure causes a false alarm.

Solution: For this kind of false fault, the HP fault indicator on the electronic board is often off or slightly bright, and the manual reset of the high-pressure protection relay is invalid. The running current of the compressor is normal, and the suction and exhaust pressures are also normal.

6. The refrigerant is mixed with non-condensable gases such as air and nitrogen. There is air in the refrigeration system. In many cases, the pointer of the high-pressure meter will vibrate severely when there is a lot of air.

Solution: This situation generally occurs after maintenance, and the vacuum is not complete. It can be evacuated at the highest point of the condenser after shutdown or re-evacuated to add refrigerant.

If your water chiller machine has a high-pressure alarm, you can check according to the article. Or you can contact the water chiller factory to help you solve it. Need to know the details of our water chiller machine, please visit the products page.

In many special use environments, companies need to apply water-cooled chillers. Since water-cooled chillers need the help of cooling towers during operation, they need to follow the instructions introduced by the chiller manufacturer after purchasing water-cooled chillers. Relevant experience, complete the normal operation of water-cooled chillers, and ensure high performance of water-cooled chillers.

How to choose to buy a cooling tower?

In the actual use environment, there are different types of cooling water towers. Simply distinguished from the shape, domestic cooling water towers are divided into two types: rectangular and circular. As for the specific functions, rectangular and circular cooling towers have similar functions, and there is no According to the introduction of the refrigerating machine factory manufacturer, the circular cooling tower can adapt to more use environments and achieve the purpose of improving the working efficiency of water-cooled chillers.

Determine the model and specific specifications of the cooling tower

Different water-cooled chillers need to be matched with different specifications of cooling towers. In the selection process, it is necessary to select suitable cooling tower equipment according to the specific data of the cooling water flow, and at the same time ensure that the water flow is in a more suitable state to ensure water cooling. According to the requirements of the refrigeration plant, the water flow rate of the cooling tower should not be higher than 20%. As long as it meets the specific value range, it can meet the needs of water-cooled chillers.

Specifications of cooling tower

In the process of purchasing a cooling tower, as to which specifications to choose, you need to complete the entire selection process according to actual needs, such as the specific operating power of the water-cooled chiller, and the amount of water inflow and discharge, combined with specific data to select the appropriate cooling tower product. At the same time, it should be noted that normal water-cooled chillers need to be equipped with a cooling water tower. The number of cooling water towers to be purchased needs to be determined according to the actual number of water-cooled chillers, and the principle of one-to-one purchase is realized, so as to meet the normal conditions of water-cooled chillers. Operational requirements.

For the introduction of cooling water tower selection techniques, users can realize that water-cooled chillers can meet daily production needs only when they cooperate with cooling water towers. The lack of any equipment has a great impact on cooling water towers. Therefore, choosing high-quality cooling water towers will improve The specific performance of water-cooled chillers plays a vital role.

Generally, when we choose a cooling tower, there is a commonly used formula:

Cooling water flow = host refrigeration capacity (KW) * 1.2 * 1.25 * 861/5000 (m3/h)

Cooling water volume = host condenser load (kcal/h) * 1.2/5000 (m3/h)

Cooling water volume = host condenser heat load (m3/h) * 1.2 (m3/h)

Cooling water volume = host cooling capacity (RT) * 0.8 (m3/h)

Cooling water volume = heat load of main engine evaporator (kcal/h) * 1.5 * 1.25/5000 (m3/h)

Cooling water volume = heat load of main engine evaporator (m3/h) * 1.2 * 1.25 (m3/h)

Cooling water volume = host evaporator heat load (RT) * 1.2 * 1.25 * 3024/5000 (m3/h)

Note: 1.2 above is the selection margin, 1.25 is the condenser load factor

Oumal Refrigeration has a professional technical team. We will select suitable cooling towers for customers' water-cooled chillers. If customers purchase by themselves, we will also recommend suitable cooling tower models to customers. If you need to know the price of the cooling tower, please contact our sales staff.

Chiller installation and maintenance instructions

1. Installation instructions

1. Machine installation, it is required to lay flat and not tilt;

2. There should be a maintenance space of about one meter on both sides of the machine;

3. Connect the cooling water inlet and outlet specifications of this machine to your cooling system;

4. The ice water pipe must be replaced with a loop to allow the ice water to circulate;

5. The ice water pipeline must be insulated;

6. When connecting the power supply, please make sure that the power supply is sufficient to bear the maximum load of the chiller’

7. The power supply of the unit must be controlled separately;

8. Must be grounded to ensure safety.

2. Troubleshooting

When the unit fails, observe the abnormal indication, then turn off the main power switch, and check according to the following steps;

1. When it shows abnormal cooling, it should be checked;

a. Whether the ice water source is sufficient;

b. Whether the water pipe valve is open;

c. Whether the ice water pump is operating normally;

d. Whether the water pipeline is disconnected.

After confirming that it is correct, press the reset button to reset, and then turn it on after 5 minutes’

2. When the refrigerant is insufficient, check the unit pipeline for leakage and blockage, reset it after troubleshooting, and restart it after 5 minutes;

3. When the display is too low, check whether the ice water pipe valve is open and whether the ice water circulates normally, and restart it after 5 minutes;

4. When the oil pressure is too low, you should look through the window to see if the oil is sufficient, and add it if it is insufficient;

5. When the compressor is overloaded, it should be checked;

a. Electromagnetic switch, whether there is aging, open circuit, poor contact, etc.;

b. Check whether the insulation resistance of the compressor is normal with a resistance meter;

c. Use a universal meter to check whether the coil resistance of the compressor is balanced. If there is any abnormality, the compressor must be replaced (note: in this case, the compressor cannot be turned on blindly without finding the cause of the failure);

When the pump is overloaded, the inspection method is the same as 5.

Three, maintenance

1. For example, in the injection molding industry: to reduce the production of "pouring sweat" from the mold, before stopping the plastic machine, turn off the cold water valve of the attached mold, or turn off the cold water, which will increase the water temperature in the mold cavity. Prevent the mold from rusting.

2. The chiller has been used for more than six months, and the high/low pressure often fails, or the cooling capacity is reduced. Please arrange for staff to clean the radiator, (if the chiller is equipped with a pressure gauge, pay attention to whether the pressure is higher than 21KG/cm2, such as If it exceeds, clean the radiator, or check whether the water pipe has been turned off). If you follow the above instructions for repairs several times, the chiller fault alarm will sound for a long time, please notify the factory to contact for repair.

3. The chiller will not be used for a period of time. Due to the solidification of water and dirt, the water pump rotor must be rotated before starting to avoid the pump blades not rotating, which may cause protection of the pump.

Water chiller cleaning method (it is necessary to find professionals to operate)

1. Clean the condenser: first remove the dust on the condenser, and then clean it with a special washing liquid. The washing liquid should be used carefully and the concentration of the washing liquid should be adjusted. Do not touch, touch the skin and eyes, if you accidentally touch it, please Rinse immediately with plenty of water and send to the hospital for treatment if necessary.

2. Cleaning the evaporator: first remove the dirt on the evaporator, clean it with clean water, do not damage the evaporator, and drain the sewage.

Four, matters needing attention

The company’s product warranty period is 15 months, and the warranty will not be provided for the following situations:

1. Those who disassemble the crew by themselves

2. Self-adjusting the pressure controller, temperature controller and control panel data, and self-adding refrigerating oil and refrigerant to cause damage to the unit;

3. The equipment and accessories of the unit are damaged by the customer's own transportation or improper installation;

4. The thermal load of the user exceeds the load of the unit, causing damage to the unit.

Warning: When not in use in winter, please drain all the water to avoid damage to the machine due to icing. Remember!