Grundfos pumps: a variety of models and designs

The operation of a modern heating system cannot be imagined without a circulating pump, which is designed to force the coolant to move through the network at the required speed sufficient to heat the living space. This article describes the circulation pump brand Grundfos.

When pumping out water from a water well or a basement, intensive circulation in the heating structure or providing water to the dwelling premises is required, one cannot do without a circulating pump.

The Danish company is engaged in the manufacture of pumps and accompanying equipment for domestic use. The peculiarity of this brand is that the plant produces high quality products. During operation, Grundfos circulation pumps do not create discomfort, since they operate silently.

A circulation pump is a small piece of equipment built into the heating system. Install it on a certain site, after which he starts to perform their functions by increasing the pressure of the liquid.

Grundfos equipment does not pump fluid (unlike conventional pumps), but only redirects it and increases pressure, swaying water in the pipelines.

The circulation pump consists of the following main elements:

• electric motor;
• pump installation;
• autoelectronic control unit.

The advantages of such pumps from the Danish company:

• wide area of ​​use;
• universality of models;
• resistance to heavy loads;
• silent operation;
• energy saving;
• long operational term;
• the simplest design;
• elements of the mechanism are resistant to abrasive effects;
• No need for constant maintenance.

Disadvantages of using pumps:

• the lack of efficiency of the mechanisms limits their use in everyday life;
• improper installation may lead to some problems with use;
• the small size of the hydraulic tank necessitates frequent shutdowns of the unit.

Circulating devices of all varieties are marked Class A, which means an economical consumption of electrical energy. Ceramic bearings provide long life. It is worth highlighting the following indicators:

• temperature sensor displays operating temperatures ranging from -10 to +120 C;
• maximum temperature of the pumped liquid - from +2 to +110 С;
• temperature indicator of the environment - up to +60 degrees;
• working pressure - from 0.049 to 1.08 bar;
• electric motor power - 0.37-366 kW;
• power consumption - from 55 to 270 W;
• the weight of the device is from 2.4 to 6.5 kg.

The manufacturer offers a wide range of working models, each of which is designed for a specific area of ​​use. In accordance with these data, the following types of Grundfos pumps are distinguished:

• borehole deep Grundfos;
• autonomous pumping device;
• drainage and sewage options;
• pressure boosting system;
• circulation system;
• dosing pumps.

Each type is represented by main products and a number of modifications.

This type of equipment is represented by 3 series:

• A series of 3-inch pump units contains 31 models with different coefficients of feed height and productivity. The series is divided sectionally: SQ 1 - with productivity up to 1.7 m3 / h, SQ 2 - with a coefficient of 3.5 m3 / h, SQ 3 - 4.4 m3 / h, SQ 5 - 7.5 m3 / h, SQ 7 - 9 m3 / h.

• A separate series are available SQE units. There are 7 models in it. They are very similar to the previous ones. The difference lies only in the fact that they have a device installed with which the work frequency is adjusted and the pressure in the pipeline is kept constant.This feature is provided by the frequency converter G.

• The following series presents high-performance 4-inch stainless steel appliances. The depth at which the mechanism is able to lift the liquid varies depending on the model and ranges from 20 to 500 meters.

Such kind of products of the company is represented by series MQ, JPB and multifunctional surface water pump. All models are designed for uninterrupted supply of residential water.

The MQ series is available in two basic versions: MQ 3-35 and MQ 3-45. An electric motor and a self-priming pump are included in the mechanism. They are protected by a stainless steel case and high-strength polymer coating. The system is supplemented with a pressure tank with a membrane, which maintains the necessary pressure in the mechanism and prevents frequent shutdowns and switching on of the equipment.

Specifications:

• engine power - 850 W (MQ 3-35), 1000 W (MQ 3-45);
• productivity - 3.5-4.5 m3 / h;
• the pressure of the liquid is maintained at a distance of 35-43 m.

The model is equipped with protection against idling and overheating.

JPB model rank is presented in two options: JPB5 and JPB 6, as well as two models with an increased pressure tank. These models are automated centrifugal pump systems that operate only with clean water, without mechanical elements.

Performance indicators:

• maximum power - 780-1400 W;
• the greatest indicator of the distance of the head - 48 m;
• productivity - 3-4,5 m3 / h;
• tank volume - 24 liters (60 liters - for modified units).

Popular units related to this type of equipment are listed below:

• DP. This series is represented by single-stage centrifugal devices, which are used for pumping out liquid. The model is suitable for drainage of a ditch or a basement. Productivity - 45 m3 / h, the pressure remains at a distance of 25 m.
• EF. A series of cast iron drainage mechanisms, which are used for pumping fluid in laundries and washbasins. Not suitable for sewer system. Productivity - 45m3 / h. Saving pressure - 22.5 m.

• Grundfos DWK. The model is designed to work with contaminated liquid. Slurry pumps are used on construction sites, for pumping water when digging holes and tunnels, as well as for sewer systems. The volume of pumped water - 150 m3 / h, the preservation of pressure - 51 m.
• AR. This model is designed to function with light industrial wastewater and sewage waste.
• Sololift 2 D-2. This model is designed for pumping drains from bathrooms, kitchens, baths. The maximum pressure - 5.5 m. The maximum flow rate - 119 l / min.

• TP, CR, NB - single-stage centrifugal pumps with pipes in line. This series of pumps is used as a supplement to the main pump or a circulation mechanism in the hot water supply (HWS) design. Pump units allow you to achieve circulation in the circuit of the towel rail.

Pump stations of this type are represented by Multi-E, Hydro MPC units. These models are designed to work with multiple CRE pumping stations and a frequency controller:

• Multi-E mechanism It is equipped with two CRE devices, and is also equipped with a control unit (with the ability to switch modes).The productivity of the model is 144 m3 / h, the pressure is saved up to a height of 150 m.
• Hydro mpc operates on the basis of four series-connected devices, control is performed from the dedicated control MPC control panel. Efficiency - 1080 m3 / h, pressure preservation - 155 m.

The Grundfos high-voltage electric pump is used to increase circulation inside the heating system, as a result of which heating is stabilized throughout the whole heating design. The model range is represented by the TP, UPS, UPSD, ALPHA + series:

• TP Series designed for industrial volumes. Such models can function if installation is carried out on a prepared concrete base.
• Grundfos popular models UPS series Available in the following modifications: 15 50 130, 25 60 130, 32 40 180 and 32 60 180. The UPS model series is designed for individual or small consumption. Such mechanisms are mainly used for heating systems of private houses.
• ALPHA series used for heating private rooms. This is the most suitable option for double-circuit boiler equipment. Such devices are also suitable for floor heating systems.

These mechanisms are represented by 3 series: DDA, DDC and DDF.Such models provide precise control of the amount of fluid through (through the use of a stepper motor).

Devices consist of the following basic elements:

• multifunctional power supply;
• PTFE membranes;
• stepper motor;
• control panels.

The design of Grundfos equipment is designed in such a way that it can function with any type of heat transfer media, excluding those that contain mineral oils and aggressive elements.

Pumps are used in the following areas:

• heating design;
• hot water supply;

• ventilation system design;
• air conditioning unit;
• coolant circulation in the floor heating design;
• for pumping out of the polluted liquid from ditches, pools;
• well pumps supply water from the soil layers.

When you mount such equipment, you can reduce the cost of additional elements when drilling wells. Model units are made of anti-corrosion materials, they have a universal system of protection. Grundfos pumps can be installed on all types of pipelines that have a wide variety of parameters.Accession to the system is carried out in a threaded or flanged manner.

The following describes how to install the circulation pump yourself. The reasons for the installation may be several, namely:

• the boiler from the very beginning was not equipped with a pump;
• there is not enough boiler power for uniform heating of the room.

Pipes of a heating design are established according to various schemes. For the circulation mechanism, there is no difference where it is mounted: on a vertical or horizontal line. Here the main mistake is made, which lies in the fact that the pipes are swapped - input from output. In order not to confuse them (and in appearance they are indistinguishable), some recommendations should be taken into account.

On the case of the pump unit has an arrow, which is clearly visible to the naked eye. It indicates the direction of the coolant - at the outlet.It is necessary to mount the pump so that this side is turned to the boiler. In the passport of the mechanism that came with the device, the recommended installation scheme is indicated.

If there are two separate branches of heating, then a separate mechanism is installed on each branch, and not one joint element. For each branch, you must follow the installation rule: the installation must be carried out after the boiler, before the first branch in this heating perimeter. Such an installation will provide the necessary thermal conditions in a specific area of ​​the room, and in 2-storey buildings it will save on heating.

Installation of the pumping mechanism requires compliance with certain recommendations:

• The device can be installed in any position (horizontally, with a slope or vertically), but observing one important condition: the rotor axis is set only horizontally;
• you need to ensure that the plastic tank with electrical contacts was placed on top of the mechanism case - this will protect it from being flooded with water in case of an accident.

Below is a step-by-step instruction for installing such a unit with your own hands:

• Pre-drained fluid, so cleaned the heating system. If it has been working for a long time, then the washing must be performed several times, releasing and pouring out water.
• Insertion of bypass areas is performed (for connecting the mechanism). Between the inserts on the pipe install a bypass, which is equipped with a revolving valve. Such installation will not allow overheating of plastic inserts of spherical taps (during welding).
• Valves are mounted on the roundabout.
• The installation of the coarse filter is in progress.

• The upper bypass area is equipped with an automated air valve.
• The inset of the DHW circulation installation is performed at a certain site - according to the principle of the direction of the energy carrier. The rotor is installed in a horizontal position so that the contacts in the terminal box are oriented upwards.
• The circulation pump is connected to the electrical network through a separately installed electrical outlet with a ground connection.

Many buyers are positive about Grundfos products. Equipment owners note the following positive qualities of the units:

• automated installation that does not require intervention and constant maintenance;
• easy installation;
• silent operation;
• compactness of the device;
• large selection of products.

Grundfos products have some drawbacks. However, they usually occur when the system is used improperly and the installation is incorrect.

• A prerequisite for efficient operation of circulating equipment is the horizontal placement of the rotor shaft. This condition can be met by mounting on a vertical pipe.
• If a mechanism equipped with a valve for collecting air is chosen, it is necessary to ensure optimal circulation and the desired pressure of the heating medium. It should move along the route from the bottom up - only in this case, the air will be discharged at the right time and in the right amount, which is necessary to reduce the hydraulic resistance.

• When selecting circulating equipment from Grundfos, it is necessary to take into account the manufacturer's recommendations on the operating temperatures of the coolant. Some models are focused on temperature from +20 C, but there are options with a working temperature of +110 C.
• When operating the equipment, it is necessary to avoid the appearance of condensate, otherwise the device will fail for a rather short period. In order to avoid condensation, the temperature of the coolant must exceed the ambient temperature by at least 2-3 degrees.
• If there are doubts about their ability to install and repair the unit, then it is better not to try to perform these actions with your own hands. Otherwise, an accident may occur, which will lead to the failure of not only the pumping equipment, but also the entire heating system. In this case, it is recommended to seek help from specialists.

In the next video you will see the installation steps of the Grundfos circulating pump in the heating system, as well as the installation of the bypass.