Medium and large chiller more consider the reliability of the water flow switch, can not be wrong action, reduce the requirements of the customer's straight pipe section, adapt to the objective installation conditions.

User profile

▶ Medium and large chiller units are often used in factories and commercial buildings.

▶ Due to economic considerations, the air conditioning cold water room area is limited.

▶ There are special maintenance management personnel, air conditioning units will do regular maintenance.

▶ The air conditioning system is required to run energy-saving, and the old system will also be energy-saving.

▶ The user has some professional knowledge and can carry out simple troubleshooting.

▶ The reliability of the air conditioning system is high, especially the electronics factory usually runs 24 hours a day, once the air conditioning equipment fails to cause production, the loss is great.

According to the actual use of customers, to meet the needs of customers

▶ The limited air conditioning room area directly affects the direction of the pipeline, there is not enough straight pipe section to meet the installation requirements of the traditional target flow switch, so other types of water flow switches should be considered, it is best to have no requirements for the straight pipe section.

▶ The reliability of the water flow switch should be high, and the wrong action should not be allowed. Because of the huge losses to manufacturers and customers, the cost of each service far exceeds the price of the water flow switch itself.

▶ The user puts higher requirements on the energy saving of part of the load, and the entire air conditioning system may adopt a single pump variable flow system or ice storage system. Therefore, we should fully consider the possible situation of the customer's application and choose the appropriate form of water flow protection to adapt to this application.

Disadvantages of using traditional target water flow switch in medium and large chiller

▶ The installation of the target flow switch requires a long straight pipe section, the general water pipe of the cold water room can not meet the requirements, if installed at the elbow or valve, the target flow switch is easy to fail, if the factory installs it at the unit heat exchanger outlet, although the user does not meet the requirements of the straight pipe section, the factory still has to bear the responsibility, although the user reduces the trouble of on-site installation. But without considering the situation at the scene, you can only get yourself into trouble.

▶ There is a bellows inside the target flow switch, and the pressure generally does not exceed 10bar, which cannot meet the requirements for the pressure of large buildings.

▶ The target flow switch cannot be applied to occasions below 0 ° C (low temperature ice storage), because the condensate in the electrical box will form ice, resulting in the target can not move.

▶ The target is affected by water flow for a long time, which is easy to lose elasticity or break the target directly.

Target flow switch In a pump variable flow, due to the low flow rate of unstable flow, the target flow switch can not work properly.

▶ Easy to misoperate, usually set a delay time in the control loop, but it may cause the compressor to continue to run when the system does not flow, which may lead to the evaporator freezing.

Advantages of using WFS10/11 differential pressure flow switch in medium and large chiller

▶ Differential pressure flow switch does not require a straight pipe section, only need to take pressure from the inlet and outlet of the heat exchanger can be installed in the factory or by the customer on site.

▶ The pressure of the differential pressure flow switch is usually 20bar, which can meet the requirements of large buildings.

▶ Can be used in low temperature occasions, after treatment can be used in temperatures as low as -80℃.

▶ Differential pressure flow switch because of the pressure from the pipeline, no direct impact of water flow, no fatigue failure problem, high reliability.

▶ Differential pressure flow switch can be set to set the minimum flow allowed by a pump variable flow chiller as a protection value, which not only ensures the normal use of the user under low flow, but also gives the user more flexibility, and at the same time is effectively protected beyond the allowed range of the unit.

▶ Even if there is air in the water pipe, there will be no misoperation, every action is real and reliable, and the control system can do no delay processing to avoid the freezing of the heat exchanger caused by the delay of stopping the compressor when the water flow is insufficient.

Application of water flow protection solutions for medium and large chiller

▶ We have always been concerned about the water flow protection solution of small chiller in the past. The water flow protection solution of medium and large chiller was first launched in 2004. At present, more than 50,000 screw machines and centrifuges have adopted our water flow protection solution, and these brands include world-class brands and domestic first-line brands. After many years of field verification, the solution does not affect its excellent performance whether installed by customers or factories.

▶ At present, this program has become the designated water flow protection program of many electronics and chip factories (Intel, SMIC, TSMC). We also replace the original target flow switch with our differential pressure water flow protection program for more than 1,000 chiller units in China every year. In the past, the target plate of the target flow switch was repaired every year, but now these maintenance items are gone. It can save maintenance costs and reduce the loss of air conditioning downtime.