Fully Integrated Pump Variable Frequency Pump BWE

Fully Integrated Pump Variable Frequency Pump BWE


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Fully Integrated Pump Variable Frequency Pump BWE

Model Instruction

Product Overview

The fully-integrated intelligent variable-frequency pump is a new generation of equipment for pressurized water supply, highly integrated by the newly-developed frequency controllers and water pumps and pressure tanks of the Company, presenting a beautiful appearance and reaching an international advanced level. Such pump has capacities of artificial intelligence and automatic adjustment to meet the user’s demand for constant-pressure and variable- frequency water supply, which can help to keep constant the pressure of the water supply network and the whole system always at the best energy-efficient state.

Domestic water for residents: pressurization on the roof of high-rise buildings, apartments, and villas etc.

Public places: schools, restaurants, stations, hospitals, and stadiums etc.

Commercial buildings: hotels, office buildings, and department stores etc.

Irrigation: farms, fruit gardens, and parks etc.

Industry: manufacturing, food industry, industrial water, and other places needing constant-pressure water supply etc.

Applications Fields
Operating voltage: AC220V±10% at 50HZ, with phase-to-phase imbalance less than 2%;

Ambient temperature: -5° C ~ 40° C;

Altitude of installation site: no higher than 1,000m;

Ambient humidity: 10-90%RH (non-condensing);

No medium with explosion hazard in ambient air and no medium containing any gas or conductive dust which can corrode metal or damage insulation; application in environment of which the pollution degree is 2.


When using water, the system will present its constant-pressure and variable-frequency control, while it will automatically maintain pressure and stop in case of no water used.

The fluctuation range of the operating pressure of variable-frequency pump shall be no more than 0.01MPa.

The pump will stop working in case of idling without water.

It is able to inspect several faults concerning disconnection, overcurrent, overload, and grounding.

Frequency converter: IP65, safe and reliable

High level of integration: The water pump is integrated with the frequency converter, so it is small in size and can be installed easily and save space.

Full-automatic control: The product can automatically adjust its operating state on the basis of the pressure of the network of the user, to achieve its best working state and make the system energy-saving. When no water is used, automatic pressure maintenance and sleep will be realized and, therefore, the energy-saving effect is quite obvious. In case of failure of water pump, real-time tracking, judgement, and treatment will be carried out automatically.

Easy and convenient operation: The man-machine interaction can be achieved directly via the keys and the display on the frequency converter. The user can make settings relating to pressure on the basis of its actual operating conditions and obtain the relevant information. In the event of any abnormality, the information about such an abnormality can be got as well.

Constant-power operation: When the controller reaches the power limit, adjustment will be done on the basis of the actual operation, so as to keep the output power unchanged and protect the motor on the premises that the water consumption by the user is guaranteed to the greatest extend.

Equipment spectrum

Action description

◎ The automatic identification module senses the pressure of the system via a pressure sensor and compares it with the set pressure, and then outputs a continuous analog signal to the frequency converter which changes the operating frequency of the motor on the basis of the change of the analog signal, to finally meet the demand for constant-pressure water supply. When the user’s water consumption is large, the rotational speed will increase automatically and the power will be increased accordingly to satisfy the demand for constant-pressure water supply. If no water is used, the system will go to sleep automatically after the set pressure is reached. Where the user uses little water or the water pressure decreases to 80% due to leakage of the piping, the frequency controller will send out a signal to order the motor to operate and then make up for pressure until the set pressure is reached again, to maximize energy saving.

Performance parameters

Installation Diagram

Installation precautions
When the pump is installed indoors, there should be no water drop, metal dust, oily dirt, corrosive/flammable gas or liquid, or electromagnetic signal interference. When installed outdoors, the pump should be sheltered.

The assembling floor of the variable-frequency pump must be firm, without any split or sink

The equipment should be installed with positive pressure at the inlet while installation with negative-pressure suction should be avoided to the greatest extent. In case negative-pressure installation is required, please select a bottom valve with good quality and carry out regular overhauls.

The diameter of the inlet pipe and the outlet pipe to be connected with the variable-frequency pump should be greater than the diameter of the variable-frequency pump itself.

Please check whether the provided power supply complies with the requirement of the variable-frequency pump for the power supply at the incoming line.

During installation, the user should furnish the inlet and the outlet valves of the variable-frequency pump and the relevant flexible connections so as to facilitate repairs and prevent noise from passing through piping.

If installation is made with positive pressure at the inlet, please open the vent valve of the water pump and discharge the air prior to use. Do not tighten the vent valve until there is water flowing out. In case of installation made with negative pressure at the inlet, please fill the suction pipe with water prior to use (there should be a filling valve at the suction pipe) and start up the pump after the chamber of the water pump is full of water..

Reference for Model Selection

Computational method of maximum water consumption

A value inside brackets in the table is to be used for the independent calculation relating to cold water or hot water, when there is hot water supply.

When a shower is attached to a bathtub or a mixed-water faucet is provided with a shower converter, then for the calculation of the rated flow and the equivalent, only the faucet should be included. However, the computation of water pressure shall be based on the shower.

The water pressure needed by a domestic gas water heater should be determined on the basis of the requirement of the product and the operating pressure needed by the most unfavorable water distribution point of the hot water supply system.

The automatic sprinkling irrigation of a green belt should be designed in accordance with the requirement of the product.

When there are special requirements for the rated flow and the minimum operating pressure needed by the water supply accessories of sanitary fixtures, their values should be determined as per the requirement of the product (how to determine the equivalence when the requirement of the product is determined).

Calculation of maximum water consumption

L=Number of single-valve faucets * Rated flow + Mixed-water faucet * Rated flow +••••••+ Number of domestic washing machines * Rated flow The unit of L to be calculated should be “L/S”, converted into t/h by multiplying 3.6 (for the rated flow, please refer to Table I).
Calculation of minimum pressure

The minimum pressure should be the pressure calculated from the suction surface of the water pump, plus the minimum necessary pressure for the highest sanitary fixture used.
The minimum pressure used by the water supply equipment (Mpa) ≈ 1/100*(hg+hf)+pe
Ha: the actual lift from the suction surface to the highest fixture (m);
Hf: the loss of the piping and the bending, to be calculated as 6m-10m; Pe: the minimum necessary pressure of the highest sanitary fixture (please refer to Table I)

For example

There is a small hotel four-storeyed above the ground, about 12m high (calculated from the suction surface), including 12 rooms. Each room is equipped with one closet plan, one washbasin (with a mixed-water faucet), and one shower (with a mixed-water faucet). In addition, the hotel has one faucet for domestic washing machines, four flushing faucets for indoor ground, and four faucets of drinking fountains. Please calculate the flow and the lift of the equipment to be selected.

Calculation of the maximum water consumption:
Maximum water consumption=3.6{12 (1*0.1+1*0.15+1*0.24) +1*0.2+4*0.2+4*0.05}=6.084t/h
Calculation of the minimum pressure:
Minimum pressure ≈ 1/100* (12+10) +0.07=0.29 Mpa
Ha: the actual lift from the suction surface to the highest sanitary fixture, 12m;
Hf: the head loss of the piping and the bending, taking 10m;
Pe: the minimum operating pressure of the shower, 0.7bar.
Note: 1bar ≈ 1kg/cm2 =0.1Mpa; 1Mpa is approximately equal to 100m lift of the water pump.
When equipment is selected, the total flow of the selected equipment should be the maximum water consumption
and the lift should be no less than the minimum pressure calculated. Please refer to the Equipment Spectrum.

Overall Dimensions of Variable-frequency Pump

Overall Dimensions of Variable-frequency Pump

Packing Sizes & Weight

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