Choosing a circulation pump for heating a summer cottage
A circulation pump for heating is an equipment for the forced movement of liquid. The mechanism works in a closed system where the coolant circulates. The connection is made through the pipeline.
Types of pumps for the heating system
Pumps, first of all, differ in design:
There are options with different motor locations:
- from the side.
Depending on the location of the motor, the angle of the shaft changes.
- end seals;
- oil seals.
Location of branch pipes:
Differences in pipe diameter:
Circulation pump for wet type heating
Wet heating pumps are driven by a wheel rotor. When it is driven, water is pumped.
- pipe branch;
- efficiency more than 50%;
- simple construction;
- division into modules;
- acceptable dimensions;
- ease of maintenance;
- repair possibilities.
Dry circulation pump for heating
The pumping part of the presented devices does not come into contact with water, it is dry. There is a separation between the engine and the unit through a seal. Limited water passage, high pressure builds up.
- agglomerated coal;
- stainless steel.
Dry type advantages:
- high power;
- considerable productivity.
- high noisiness;
- the complexity of the design;
- problem installation.
Dry pumps are actively used for heating buildings and structures. For the purpose of comfortable operation, an isolated room is required.
Subgroups of dry pumps:
The difference lies in the rotor circuit connections. The pump is installed separately or in a pipeline.
If we consider the second option, you need a place for installation, the corresponding conditions:
Characteristics of the circulation pump for the heating system
When the selection of a circulation pump for a house is carried out, the main characteristics must be taken into account:
- operating temperature;
Wet, dry circulation pumps operate at a certain temperature of the coolant. It can be a solution, water. The performance of the device is closely related to the diameter of the pipeline, the total capacity. The specialist determines the parameter of the maximum load of the chain, calculates.
- hydraulic losses;
- circulation speed;
- the number of cycles;
- system resistance level.
Benefits of using circulation units
When choosing a circulation pump for a home, the following advantages are noted:
- the possibility of using large diameter pipes;
- wide temperature range;
- the use of modern radiators;
- economical heating;
- installation of pipes from various materials;
- insignificant heat loss.
When the instruction falls into the hands, you can find out information about the prohibitions on the operation of circulation pumps in heating systems.
- disassembly of the pump under pressure;
- immersion in an aggressive environment;
- storage near explosive objects;
- pumping hazardous chemicals;
- use of a flammable liquid;
- the use of corrosive substances;
- pumping liquids with a high fat content;
- the use of a substance of increased density (more than water);
- sharp cooling of water (up to 0 degrees).
Circulation pump applications
Circulation pumps can be used in modern heating and hot water systems. They are suitable for pumping clean water.
Execution option with:
- constant flow;
- variable flow;
- temperature controlled.
- minimum temperature +4 degrees;
- protection class ip44;
- the maximum allowable temperature is + 40 degrees;
- humidity of the environment up to 90 degrees;
- insulation class F.
There is also a requirement for the pumped liquid. Installation of a pump in a house is possible when using a coolant with a temperature of 0 to 150 degrees. However, a lot depends on the difference with the environment. The temperature of the pumped liquid must be higher than.
The pH is another characteristic that is indicated in the passport of the device as pH. In wet, dry modifications, it fluctuates around 68 pH.
Thermal fluid warnings:
- the presence of solid particles;
- mineral oil content;
- the presence of fibers;
- explosive liquid use.
There are options for pumping high viscosity coolant. Standard models are not suitable for this, as parts wear out. First of all, the bearing group suffers. When the density of a substance is increased, a cavitation effect is observed..
The pressure in the system rises and the motor is heavily loaded. This is reflected in the increased noise level of the device, the condition of the shaft deteriorates.
The relationship between pressure and fluid temperature has been proven:
- water 85 degrees pressure up to 0.5 bar;
- 90 degrees – pressure 0.28 bar;
- 110 degrees – up to 1 bar.
Complete set of pumps
In the set of the circulation pump, the user will see the following elements:
- gaskets (2-3 pieces);
- fixing nuts;
- instructions with a warranty card;
- power cable (1-5 meters).
In the manufacture of circulation pumps, international standards apply, which the manufacturer adheres to. They apply to household, industrial models.
- IEC / EN 60335-1.
- IEC / EN 60335-2-41.
- Directive 2006/95 / EC.
The documentation concerns the operation of electrical devices, connections. There are requirements regarding the safety of installation, inspection.
Commissioning or installation may only be carried out by a qualified technician. The organization receives the appropriate permission to conduct business. Consumers, in turn, check the warranty card, pay attention to the documentation. Premature start-up of equipment leads to component failure. We are talking about the wear of pump elements and the heating system as a whole..
- taking into account the instructions of a specific model;
- grounding check;
- installation of a residual current device;
- checking the surrounding objects;
- safe area for the pump;
- fencing from children;
- protection of heating elements;
- temperature control;
- simple pump;
- damage check.
If water is frozen in the pipeline, it is prohibited to use the equipment. Otherwise, the pipe ruptures. If a leak appears, inspect the insulation. During the operation of the equipment, the metal surface heats up. Dismantling, as well as installation, is carried out by specialists. Initially, the connection to the network is checked, and then the water supply is turned off.
The master is obliged to shut off the valve, check the pressure. Installation is carried out with the pump off..
The power supply unit must be located separately. Even when inspected, the pipeline is closed. When connected to the power system, the main components are checked according to the instructions. Each model is stored under specific conditions. According to the standard, manufacturers indicate a dry, ventilated place. The pump feels good at room temperature. Before storing the equipment, it is necessary to drain the coolant..
Condensation is detrimental to pump elements, therefore it is important to avoid sudden temperature changes. Replacement of units is possible with the selection of original parts. The manufacturer’s instructions contain a list of components. Failure to comply with the requirements, the company does not guarantee the reliability of the equipment. If an unauthorized replacement of components is made, the warranty does not count. Also, do not forget about the safety of operation..
Block diagram of the model using the example of Leo products:
- top plug;
- rotor with bearings;
- motor stator.
Installing the pump
The installation scheme involves the use of a heat heater, measuring equipment, a tank, a radiator and a pump. Any boiler, heating boiler is suitable as a heat heater. Valves, fuses, pressure gauges are used to measure and control temperature.
The pump connection diagram in the pipeline occurs in the following sequence:
- Water filter.
- Control nut.
The direction of the coolant is taken into account, it is important to adhere to the scheme. On the sides of the pump, sealing strips are installed between the nozzles. When installing electrical equipment, the sealing is checked.
Choosing a place for the pump is a separate conversation. If you believe the advice of experts, you need to choose the point with the lowest temperature. It turns out that the installation next to the boiler is a gross violation. Such a system does not provide a high level of efficiency. The equipment can be used in underfloor heating systems. In this case, different rules apply. Installation is carried out on the flow line.
- flow break;
- depressurization of the system;
- the appearance of traffic jams;
- system blockage.
Additional installation rules
For safe circulation of the coolant, a coarse filter is used. Wet electric pumps are installed in a horizontal position. When selecting equipment, the maximum load is taken into account, which is closely related to the noise level. The heating system is started after flushing. The pipes must be free of debris and other foreign particles..
It is important to remove air to prevent the possibility of traffic jams..
Rules to remember:
- checking the terminal box;
- use of an expansion tank;
- air vent installation.
When selecting control and measuring devices, the operating temperature must be taken into account. For reliable readings, it is better to keep them away from heat sources..
Common installation errors
When installing the pump, it is important to pay attention to the location of the following elements:
- terminal box;
- Control block;
The terminal box must be clearly visible. When installing, beginners often turn it to the wall, this is prohibited. When installing the element, you need to think about the power cable routing.
When looking at a wet pump, do not turn it over. The device will work, but with less efficiency. When the element is turned over, condensation appears.
It is better to install the pump strictly in a horizontal position and check the level.
This can be done along the shaft. The control unit is attached to the rotor. Several mounting options are available: top or side
Unit installation instructions:
- Valve overlap.
- Pressure relief.
- Loosening the clamps.
- Lock block.
- Valve opening.
To reduce heat loss, it is necessary to install the insulation correctly. If done correctly, frost protection is guaranteed. Considering an inept private master, the pipe is often overlapped along with the control unit, this cannot be done. It is also forbidden to cover the stator or the panel..
Despite the different technical data of the pumps, general recommendations for the installation of the tank can be given. For wet or dry models, it is fixed on the return line. Installation is carried out in front of the pump for efficient pumping of the coolant. As you know, a stable pressure is maintained in the membrane tank, there is air. The indicator changes, so it is better to pay attention to the initial pressure, temperature of the coolant.
A bypass pipe or bypass is required to regulate the unit. Installation is most often done near radiators. If the correct connection is made, the coolant returns to the battery. In the absence of a bypass, it is impossible to repair the unit. Installation work is done during a power outage.
Electrician according to the scheme
According to the connection diagram, the pump is grounded. However, it does not require motor protection. The elements must be compatible in parameters, the data is checked against the table.
Power supply installation instructions:
- Preparing the cable.
- Opening the terminal box.
- Cable entry.
- De-energizing the system.
- Contact position adjustment.
- Closing the terminal box.
How to start a circulation pump for heating
To start the electric pump, you must follow the plan. The first step is to supply the coolant; it is necessary to pump out the air from the system. Next, the pump is mounted, the main components. The specialist checks the liquid level and starts the unit.
- coolant leak;
- increased vibration;
- loud noise.
When operating the pump, one must not forget about the mode. There are options for 2, 3, 4 speeds, so a switch is used.
The main task is to adjust the temperature, reduce the amount of energy consumed.
At the same time, the system should not experience critical loads, we are talking about the pressure.
A circulation pump for heating often suffers from improper use, or for reasons beyond the control of a person..
- the pump does not turn on;
- interruptions in the operation of the electric motor;
- low, high blood pressure;
- power supply failure;
- poor performance.
If the problem is with the pump, the equipment may be poorly connected. Sometimes the unit is shut down due to increased load. The electric motor falls asleep due to lack of grounding or malfunctioning of the wheel. For example, it can be jammed or parts are worn out..
Pressure jumps due to non-observance of operating rules. According to its characteristics, the pump may not pull the heating system. Sometimes filter clogs occur, again impeller defects affect. Intermittent motor operation indicates power surges. It is better to double-check the state of the coolant, its density and temperature..
When the engine is running, but not at full power, there may be a leak in the system. Experts are in a hurry to inspect the pipeline, the impeller.
Buyers are puzzled by the question of which pump to choose.
If we consider the products of Grundfos, it is better to choose goods of the middle price category. Many models boast a capacity of 50 liters per minute. Average power – 0.04 kW, weight – 2.2 kg. Serbian manufacturer offers wet and dry versions.
If the choice fell on Wilo products, it is better to look at products of the middle price category. Many models are suitable for horizontal mounting. There are products with a small, high class of protection, insulation. Average speed – 2500-2800 rpm.
The above is a circulation pump for heating. The principle of operation, the device is clear. There are nuances for installation, operation, verification.