Constant Pressure Water Supply

== **1.Industrial Background** ==

Central air conditioning system is an indispensable and important component in modern buildings. With the improvement of people's living standards and the acceleration of urbanization, the application of central air conditioning systems is becoming more and more widespread, and the market size is increasing year by year. In the past decade, the application scope of central air conditioning systems has continued to expand, not only in traditional commercial and industrial fields, but also in residential, medical, transportation and other fields. Energy saving, environmental protection, comfort and safety have become the main technical features of central air conditioning systems.

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== **2.Industrial Overview** ==

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Frequency control technology is a stepless speed regulation technology of AC motor. It is widely used in the field of water supply control for its unique and excellent control performance, which makes the constant pressure water supply technology develop rapidly. In the actual system, the feedback actual pressure is compared with the set pressure. When the pressure of the pipe network is insufficient, the output frequency of the inverter is increased, and the speed of the water pump is faster, forcing the pressure of the pipe network to rise; On the contrary, the output frequency of the inverter is reduced, the pressure of the pipe network is reduced, and the water pressure remains constant. When the frequency control cannot adapt to the pressure change, the water supply units of different capacities will be automatically switched without disturbance to reduce the impact of flow and pressure fluctuations, and smoothly adapt to the water demand of different periods, so that the total flow and head can adapt to the change of water consumption in the pipeline network, improving the efficiency of the unit, maintaining the constant pressure of the pipeline network, and achieving the effect of energy saving.

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== **3.System Working Principle** ==

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The system use VZ2000 and it has two control modes: manual and automatic, namely industrial frequency and frequency conversion. Pump No.1 or Pump No.2 is allowed to be in use through the change-over switch.

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When manual control is selected, the pump motor can be directly started and stopped; Manual control also has the function of automatic operation. When the pressure is higher than the upper limit pressure set by the electric contact pressure gauge, the system will automatically stop, and when the pressure is lower than the lower limit pressure set in the electric contact gauge, the system will automatically start. The system has the function of overheat protection.

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When choosing automatic control, the inverter and transmissible pressure gauge jointly complete the control, and the system pressure can be set at any time. When the actual pressure is lower than the set pressure, the inverter automatically adjusts the output frequency to accelerate the motor. When it approaches the set value, the motor will automatically slow down gradually, so that the system pressure is always about the set value. The system has a sleep mode. When there is no water demand outside and the sleep delay time is exceeded, the frequency of the inverter will be automatically changed to 0Hz. When the system pressure is lower than the wake-up pressure of sleep, the system will automatically start to meet the needs on site. The system has a status indication at runtime.

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