The circulation pump is a pump model that is oriented to work in various systems, including heating structures. It is worth noting that the narrowing or expansion of the pipes at the installation site of such devices is unacceptable. A point change in the pressure of the thermal carrier provokes the appearance of gas bubbles, which is fraught with a lot of problems.
Features
For circulating pumps, predominantly purified or distilled water is used. This nuance is due to the increased density of liquid-glycol mixtures. Together with good penetrating characteristics, this combination adversely affects the life of the pump.
Some manufacturers in theory allow the interaction of the device with a composition of ethylene glycol and water. The first component in the mixture should not exceed 50 percent. At the same time, manufacturers note that this method of operation increases the load on the engine. For these reasons, the estimated power of the purchased unit should be taken into account with a margin. Additional verification of such models is required if the percentage of glycol in the composition exceeds 20%. In addition, working with toxic coolants is much more complicated and harmful.
Grundfos circulation pumps
This manufacturer should highlight the Alpha-2 series. It represents a new generation of Danish-made appliances based on UPS systems. Modifications are comparable with the auto-ADAPT program, respond to a change in temperature, autonomously regulate the flow of media.
Advantages of the device:
- the presence of summer and winter functionality;
- motors are equipped with stable magnets and an original plug;
- starting moment - 27 Nm;
- easy start after long idle time;
- increased energy efficiency with pressure adjustment and several fixation options;
- a wide range of models (versions with a standard cast-iron case, options with an air separator, devices with a stainless steel case);
- high rate of reliability;
- minimum noise parameter (up to 43 dB);
- comfortable operation (display of parameters are displayed on the front panel);
- small overall dimensions and weight (length - 180 mm, weight - 2100 grams);
- durability (five years warranty from the manufacturer).
Among the shortcomings of this circulating pump are its inability to power surges and a rather high price.
Grundfos UPS
Among this line, modifications like 25/40, 25/60, 32/80 are more often bought. The pressure varies from 4 to 8 meters. Danish units are equipped with an asynchronous power unit, cast iron or stainless steel skeleton (depending on the destination). The separation of the rotor from the stator is carried out using a special sleeve.
Benefits:
- installation in open and closed structures is possible, vertically or horizontally;
- bearings are lubricated by pumping fluid;
- low power consumption;
- resistance to wear and mechanical stress;
- low noise level (up to 43 dB);
- significant temperature limit (from -25 to +110 degrees);
- unpretentiousness in operation, ease of installation and use;
- weight - not more than 4.8 kg, installation length - 180 mm;
- durability (factory warranty - from 36 months, real working life - 10 years).
Cons - lack of power cable, high price, obsolescence of most devices.
Wilo star-rs
These circulating pumps are analogs with a centrifugal wet rotor. The most common models of this brand have a pressure of 4 and 5.5 m, power 48 and 84 watts.
Features:
- skeleton - from cast iron;
- installation nuances - the shaft is placed in a horizontal position, the device is connected using spring clamps;
- the motor during operation is not sensitive to blocking currents;
- for economy, three operating modes are provided;
- the motor is not subject to overheating, since the bearings of the "wet" rotor are lubricated with a working fluid;
- wear resistance, durability, reliability;
- the presence of a polypropylene wheel, a shaft made of stainless steel;
- extended operating temperature range (from -10 to +110 degrees);
- surge protection, minimum noise level;
- ease of installation, ease of use.
- light weight (2.4 kg), compact dimensions (mounting length - 130 mm).
Among the shortcomings are the high price (about six thousand rubles), the appearance of noise over time (at third speed).
Gilex
From this manufacturer it should be noted circulating pumps for water line "Compass". In this series, six varieties are presented, differing in power and working surface of the processing. Such units belong to budget variations with a wet-type rotor without stuffing box seals.
The most popular modification is Jeelex Tsirkul 25/40. It is equipped with a cast iron housing. Some versions have brass or bronze edging. The pump consumption is three cubic meters per hour (head - four meters, working power - 65 W). The temperature range is from +10 to +110 degrees Celsius.
Benefits
Highlight such moments:
- a decent indicator of efficiency, thanks to the adjustment of the power parameter in three positions;
- convenient installation (union nuts are supplied);
- low noise (up to 65 dB);
- simplicity of design, providing reliability and durability;
- light weight (up to 5.6 kilograms, depending on version);
- well-developed service network;
- reasonable price (about three thousand rubles).
Among the minuses is the lack of a cable as standard, the first time during operation there may be a smell of paint.
Updated DAB heating circulators
In the model range from this manufacturer, the most popular model is VA 35/180. The productivity of the device is three cubic meters per hour, the maximum working pressure is 10 bar with a pressure of 4.3 meters. Power indicator - 71 watts.
In 2017, the Italian company updated and finalized the specified modification. A cast-iron skeleton with a cataphoresis coating appeared in the design. An advanced ceramic shaft was introduced into the motor, and laser engraving was added to the label.
Advantages of the circulating pump in the heating system:
- Three-mode adjustment of work, increasing the efficiency of the product.
- Ease of installation using a special quick-detachable connection both vertically and horizontally.
- Two options for installation length (180 and 130 mm).
- A high degree of maintainability (the device is dismantled by removing four screws).
- Low noise, comparable to the pace of a quiet conversation.
- The basis of the electric motor is made of cast aluminum, the impeller is made of technical wear-resistant polymer.
- The shaft and thrust bearing are made of ceramic.
- In addition, the design contains parts made of stainless steel and graphite.
- Acceptable cost (from 4.5 thousand rubles).
The disadvantages include the lack of an information monitor and possible defects of some elements in the factory version.
UNIPUMP LPA
The installation of circulating pumps in the Unipump LPA series heating system saves energy. These units are structurally and technologically similar to the Grundfos models of the Alpha 2 line. The units are oriented to heating circuits with night action or variable indicators, including operating temperature.
Features:
- the devices are intended for domestic systems and hot water supply systems; they provide carrier circulation in single and double circuit designs;
- the equipment includes an electric motor with long magnets, a frequency adjustment unit, a control panel;
- profitability achieved by setting the appropriate mode from five ranges;
- lack of an engine overheat, thanks to the "wet" rotor providing constant greasing of bearings;
- operating temperature limits - from +2 to +110 degrees, pressure - 10 bar;
- low noise not exceeding 43 dB;
- ease of use, thanks to the presence of an informative monitor;
- increased level of protection (IP-42);
- compact dimensions (130 and 180 mm in length);
- power consumption - 45 W;
- fairly high price (from 5.5 thousand rubles);
- low performance (service life is about five years, warranty - 2 years).
Installation Recommendations
It is important to know how to install the circulation pump correctly. Each unit comes with instructions. Her careful study will allow you to understand the intricacies of installing the device. This procedure is quite feasible to perform independently. Part of the pipe is cut off at the installation site, having previously removed all the liquid from the system.
In most cases, cleaning of the old structure will be required. This is necessary to remove rust and dirt from the system. It is difficult to do this through the drain valves, due to the small cross section of the hole. For these purposes, use a cut point. A hose is connected to one side, feeding the carrier under pressure, on the other hand, water will drain.
On the compartment for the pump, a bypass is installed, which is necessary for safety in case of a sudden power outage or a breakdown of the device. As a result, the liquid will circulate through the main line, on which the crane is opened, which is opened mechanically (manually). The best option is an automatic shut-off valve that responds to changes in system pressure.
Sequencing
Which circulating pump is better for heating is indicated above. Regardless of the type of device selected, the sequence of manipulations during installation and connection is similar. Perform the following actions:
- Drain the coolant and clean the heating system.
- If the structure has been used for several years, it must be washed twice.
- The purchased pump is driven into the intended place according to the principle of adjusting the incoming energy.
- After installation, the device is charged with working fluid.
- They check the operation of the entire system, be sure to eliminate all existing shortcomings.
- Turn on the unit, after ensuring its interaction with a special fuse.