Flow Switch in central air conditioning system  [2015-3-13]

We all know that the central air conditioning is generally water as a secondary heat transfer medium, proper water flow is necessary to ensure reliable operation of the central air conditioner, water flow may result in inappropriate chiller evaporator icing, condensation pressure is high, compression machine "seizures" faults, so proper water flow detection method is an important guarantee to avoid air conditioning host failure. Given the importance of water flow testing, after taking into account the user's maintenance costs, many projects have begun asked to select the type of water flow switch.

The need for central air conditioning system to detect water flow detection central air conditioning unit is to ensure that the cooling water flow system and guarantee the normal operation of the premise. First, the central air conditioning system is taken away by the flow of cold water and heat to ensure reliable heat exchanger, there is no water, there is no so-called cooling or heating. Second, when no water or less water flow for the evaporator, the evaporator load decreases, the evaporation temperature is lowered, if the compressor runs continuously will cause the evaporator icing. If the evaporator frost protection can not be timely, likely Splitting evaporator, causing the water side and refrigerant side of the refrigeration system of collusion, the entire cooling system scrapped. In addition, if the water flow system is too low, will lead to long-term return air pressure is too low, can not be successfully discharged from the compressor oil return to the compressor may cause compressor "seizures." When no water or less water for the condenser, the condensing temperature and pressure rise, resulting in a substantial reduction in the condenser outlet refrigerant flow through the expansion valve, the cooling capacity decreases.

Flow switch can be a good solution to this problem and maintain, Germany Kewell piston flow switch structure principle FP53 Series: line installation, mechanical flow switches for liquid or gaseous media. Sturdy plastic, aluminum or stainless steel housing is optional. Media push the plunger spring to the set position to the reed switch-off signal output passive magnetic field acting on.

Features:

1, a minimum pressure loss

2, good repeatability, dirt capacity

3, mechanical and electronic part is completely isolated

4, with a switch to set the scale table is easy to set

5, the user need not be set in the field

6, LED display switching operation state

7, large switching capacity

8. Select a variety of materials and pressure rating

The flow switch is widely used in the field of automation and refrigeration and air conditioning industry, customers can choose different flow switch depending on the environment.