Direct municipal water supply via the city's water network

(1) A water supply method that does not require secondary pressure from water supply equipment, directly supplied by the municipal water pipeline network, also known as primary water supply.

(2) Direct water supply from the municipal water network is determined by the pressure of the water supply municipal network at the location of the building.

(3) Multi-story buildings, lower sections of high-rise buildings, and locations where municipal pressure meets usage requirements typically utilize direct municipal pipeline water supply.

2. Low-level reservoir + Industrial frequency pump + High-level water tank (water tower) water supply

The city's water supply network feeds into a low-level reservoir, which is then pressurized a second time by equipment before entering a high-level reservoir (or water tower). The pressure difference generated by the height difference is used to supply water to distribution points.

(2) High-level water tanks typically use level control, stopping the pump when the water level reaches the set high level and starting the pump when it falls to the set low level.

(3) Pumps operate at industrial frequency, with lower single-pump power utilizing direct startup, and higher power employing soft startup or variable frequency startup.

3. Low-level reservoir + constant pressure variable frequency water supply equipment for water supply

Water is supplied to the low-level reservoir, then pressurized by variable-frequency water supply equipment before being directly delivered to the distribution points.

(2) The equipment employs variable frequency control to regulate the number of pumps activated based on the amount of water used.

(3) Standard variable frequency water supply systems operate one pump on variable frequency and the rest on fixed frequency; all-pump variable frequency systems can run all pumps on variable frequency simultaneously, switching to fixed frequency operation upon reaching the maximum water usage capacity.

(4) The equipment features variable frequency start-up.

4. Pressure Boosting (No Negative Pressure) Variable Frequency Water Supply Equipment

(1) Potable water is supplied to the distribution points after being pressurized through a stacked-pressure (no-negative-pressure) supply system.

(2) The equipment employs variable frequency control to regulate the number of pumps activated based on the amount of water used.

(3) Standard variable-frequency water supply equipment operates one pump at variable frequency while the others run at fixed frequency; full variable-frequency water supply equipment can run all pumps at variable frequency simultaneously, switching to fixed frequency operation for the entire system upon reaching the maximum water demand.

(4) The equipment utilizes variable frequency start-up.