Power Supplies

Switch For Central Heating Pump Schematic Circuit Diagram

Efficient Pump Operation in Central Heating Systems

In certain central heating systems, pumps are equipped with up to three different speeds. However, running the pump at the lowest speed may lead to insufficient circulation of hot water, potentially causing the boiler to overheat. The proposed switch circuit presented here serves as a preventive measure against such occurrences. The operation of the pump is effectively controlled by central heating pump controllers, which come equipped with temperature sensors specifically designed for central heating systems. By setting the activation temperature for the pump, the central heating pump controller ensures that the pump engages when the boiler temperature reaches the predetermined value. Additionally, a specified temperature is set for pump deactivation, preventing unnecessary operation and conserving energy. Central heating pump controllers not only contribute to energy savings but also facilitate prolonged and efficient device operation.

Electrical Configuration of the Pump

The electrical setup of the pump is illustrated in the accompanying diagram. Typically, the main winding has a resistance of 175 Ω, while the auxiliary windings measure 135 Ω. It’s important to note that these values may vary in certain pumps and should be verified accordingly. The inclusion of a capacitor in series with the windings introduces the necessary phase shift, enabling the pump motor to rotate. In positions a and b, the impedance is deliberately increased, resulting in a weaker magnetic field. This intentional weakening slows down the motor, causing the pump to displace less water.

Switch for central-heating pump Schematic diagram

Switching Mechanism for 7aato.Matic Operation

A straightforward circuit facilitates the 7aato.Matic in seamlessly transitioning between positions a and b or between b and c. Its 24-V input operates in parallel with the gas valve drive for the main burner. As the main burner’s valve closes, the pump’s speed increases, effectively preventing the boiler from overheating.

Adapting to a 240 V Gas Valve Drive

In instances where a 240 V drive is utilized for the gas valve, a small transformer can be employed to derive the necessary 24 V. It is essential to consider safety precautions. As the 24 V supply reaching various room thermostats is insulated from the mains solely by the relay. Consequently, it is imperative to use a heavy-duty relay type that ensures sufficient insulation.

 

Switch for central-heating pump Schematic diagram

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