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2 Technical description

6 720 646 864 (12/2010) – Technical guide Logano GE315, GE515 and GE615

2.2.2 Structural features

Heating water routing

With the Ecostream cast iron boilers Logano GE315,

GE515 and GE615, the flow and return are arranged at

the back of the boiler, at the top. A special feed pipe is

integrated into the top hubs of the boiler sections, into

which cold return water flows. This construction provides

hydraulic separation of the flow and return water. For

every boiler section, there are generally two symmetrical

holes positioned at the sides of the feed pipe. A regulated

volume of return water is therefore supplied evenly to the

boiler sections (Æ Fig. 3)

Fig. 3 Large flow hub with feed pipe in the

Logano GE515

RK Return

VK Boiler flow

1 Combustion chamber

2 Water guide element

3 Top hub for flow water

4 Feed pipe for return water

The boiler water is heated by the inner heat transfer

surfaces (combustion chamber and secondary heating

surface) and rises. Colder water sinks at the external wall

and flows towards the inner heating surface (Æ Fig. 4).

Fig. 4 Functional diagram of heating water flow in the

Logano GE515

A water guide element is moulded into every boiler

section below the top hub. This means rising hot boiler

water is channelled around the feed pipe to the outside.

Inflowing return water mixes with the hot boiler water. The

injection effect improves the mixing. In this way, the

heating surfaces are shielded from the cold return water.

This type of boiler water flow results in even temperature

distribution inside the boiler. The result is significantly

reduced thermal stresses.

6 720 644 097-02.1il

6 720 644 097-03.1il

15 20 26 31 36 41 47 52 57 62 68 73 83 89 °C

Buderus Logano GE515 Technical Guide

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