Why the gas or electric heating boiler does not turn off

Circulation pump in a gas boiler

The circulation pump in the construction of a gas boiler accelerates the coolant through the heating system, due to which the coolant is cooled in the system more slowly and returns to the boiler in a "heated" form. Since heating in the boiler occurs to a certain temperature, the next heating cycle of the coolant will be shorter. Hence, lower gas consumption and fast water heating cycles (higher efficiency).

It is believed that the installation of circulation pumps is not required for hydraulic heating systems, however, it will not interfere at all in old heating systems with large diameter pipes.

When buying a gas boiler with a circulation pump in the design, you no longer need to install a separate circulation pump in the heating system.

The main reasons for the increase in pressure

Most often, the reason why the pressure in the heating circuit rises in a closed heating system is a breakdown of the equipment due to which the indicators either jump upwards or fall sharply downwards. But other than this, the reasons also include the following:

1. A sharp increase in the pressure of the coolant due to a closed shut-off valve. An increase in pressure is observed in the system, after which the boiler is blocked and the system stops. To fix the problem, you need to check the fittings for leaks, open valves and taps to relieve pressure.
2. The reason for the rise in pressure in the heating system may be a dirty dirt filter. Rust particles, debris, sand and slag accumulate on the surface of such a filter. As a result, the pressure in the area between the boiler and the filter increases greatly. To eliminate the cause, it is necessary to clean the filters regularly, at least 3-4 times a year. Also, a good solution would be to replace conventional mud collectors with magnetic or flush filters. They are more expensive, but much easier to maintain.
3. The operating pressure of the system may rise due to a malfunction of the boiler automation. This is a factory defect, incorrect system settings, a breakdown of the control board. All these problems require boiler repair, which can only be carried out by a master.
4. Leaks of the make-up valve are observed, that is, water will constantly penetrate into the general circuit, which causes a pressure surge. Repairs are usually fairly straightforward; all you need to do is replace the rubber gaskets. But if there is a defect, the crane or equipment should be completely replaced.

Why does the pressure drop in a double-circuit or conventional boiler? This situation most often occurs when the expansion tank breaks down or the air valve is missing. Repair or complete replacement of the tank may be required to fix the problem.

Features of pump repair for Daewoo DDP 7525 boilers

DDP 7525 pump of the DEU boiler

Damage to the circulation pump of the Daewoo gas boiler

Is a fairly common problem. Many clients often have to deal with it in practice. In particular, this applies to the DDP 7525 pump. In our article we will talk about:

• the reasons for the problem;
• ways of solving;
• technical features of the device.

Undoubtedly, the main technical advantage of the product of the Korean company is the presence of reverse rotation. This allows the pump to change direction depending on the boiler operating mode. So, first, when the heating mode is on, the pump circulates in one direction, then in the opposite direction when hot water is turned on.

This feature of the system also covers the main problem of such gas boilers: it is impossible to replace such a pump with any other.In addition, according to statistics, the failure of Korean devices occurs more often than European ones.

Breakdown of DDP 7525 pumps occurs due to:

• wear of the friction bearings and the shaft connected to them;
• the occurrence of a short circuit in the motor winding.

Let's dwell on these points and look at them in more detail.

Pump rotor

The circulation pump consists of two friction bearings. Moreover, one is located directly in the engine cover, which protects the electrical part from water ingress. Therefore, it wears out faster. You can feel the difference by looking at the photos:

a serviceable part is shown on the left, in the opposite side - a failed one.

In our opinion, the main reason for this problem is the increased contamination of the coolant in the system. And there is an explanation for this: the fluid moved by the pump directly contacts the friction bearings. And in the water there are rust particles, due to which the surface is erased. Thus, the composition and quality of the coolant influences the bearing life.

Daewoo boiler pump winding

The second possible cause of a malfunction of the circulation pump is the occurrence of a short circuit in the mains. We suggest carefully examining the photos. On one, you can see traces of melting of the insulating coating in the places where the electrical wires and the motor coil are connected. On the other, we see the device in an absolutely good condition.

It is quite simple to determine that it was a short circuit that caused the breakdown. First of all, you need to remove the engine cover and carefully examine the condition inside. As practice shows, this is one of the weakest points of the Daewoo pump.

A possible cause of a short circuit is the ingress of liquid into the motor. In the modern version of the device, specially for such cases, the presence of holes is provided so that water can flow out.

There are also options when, due to increased bearing wear, the rotor play increases, and the impeller, fixed on the shaft, begins to exert a mechanical effect on the base. You can see the results of these processes for yourself.

Below you will take a closer look at the design features of the Daewoo pump and its disassembly scheme.

Unscrew four bolts with a hexagon in a circle.

We unscrew the plug to de-air the pump.

Immediately pay attention to the O-ring on the plug, if you have it like that on the left, then you will definitely have problems with the pump.

Next, pry off this cover with a screwdriver

We turn off the capacitor that opened there

We insert a flat screwdriver of a suitable size into the slot on the shaft and, turning the pump over to the top with it, knock out the rotor from the engine, not with a strong blow. (DO THIS VERY CAREFULLY, ENGINE SHAFT IS FRAGILE)

Here we will see the same rubber seal that often passes water into the motor.

And the last, with the help of some kind of insert, we knock out of the housing, either only the stator, or together with an external bearing.

That's all! If you have any comments or suggestions, write comments. : bye: New Daewoo boiler pumps always in stock.

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Signs of a breakdown of the gas boiler pump

The main indicators of a malfunction of the coolant supply pump are failures in electrical power, short circuit (mechanical damage to the motor windings), a noticeable deterioration in the supply of heat in the system. All such problems during the cold period must be eliminated promptly.

The boiler pump is repaired by a master in the event of malfunctions associated with partial (complete) replacement of parts. In other situations, a complete replacement of the assembly with a new structural element is performed. The installers always have in stock branded spare parts for carrying out full maintenance of gas heating boilers of various brands.