Bedienungsanleitung Buderus Logamatic 4121 (Seite 9 von 88) (Englisch)

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What you should know about your heating system

Logamatic 4121, 4122 and 4126 - Subject to technical modifications.

Why do I need a time switch?

Advanced heating systems are equipped with a time

switch to save energy. With a time switch you can set

an automatic changeover between two different

room temperatures, subject to time. This enables you to

set a reduced room temperature at night, or other times

when a reduced temperature is sufficient, whilst

operating your heating system with the standard room

temperature during the day.

You have four options for reducing the room

temperature via the control unit. Upon request, your

heating contractor will select and set up one of these

options:

– Total shutdown (no room temperature regulation)

– Reduced room temperature (a reduced room

temperature will be regulated)

– Change between total shutdown and reduced

heating subject to room temperature

– Change between total shutdown and reduced

heating subject to outside temperature

With total shutdown of the heating system, no pumps

or other system components are controlled. Heating

only recommences if the heating system is subject

a risk of frost.

Heating with reduced room temperature (night mode)

only differs from standard heating mode (day mode)

through a lower flow temperature.

When changing from total shutdown to reduced

heating, total shutdown is activated subject to room

temperature when the actual room temperature

exceeds the set room temperature. This function is only

possible if a room temperature is being captured.

When changing from total shutdown to reduced

heating, total shutdown is activated subject to outside

temperature when the actual outside temperature

exceeds the set outside temperature.

What are heating circuits?

A heating circuit describes the circuit taken by the

heating water from the boiler via the radiators and

back

again (Æ Fig. 1, page 6). A simple heating circuit

comprises a heat source, a flow line, a radiator and

return line. A pump installed in the flow line circulates

the heating water.

Several heating circuits may be connected to one

boiler, for example, one heating circuit for supplying

radiators and a further circuit for supplying an

underfloor heating system. In this case, the radiators

are supplied at a higher flow temperature than the

underfloor heating system.

The supply of different flow temperatures to different

heating circuits can be achieved by e.g. installing

three-way mixing valve between the heat source

and

the underfloor heating system.

Using an additional temperature sensor in the flow of

the heating circuit to be supplied, sufficient cold return

water is mixed via a three-way mixing valve into the hot

flow water, to achieve the required lower temperature.

It is important to note that heating circuits with three-

way mixing valves require an additional pump. This

pump enables the second heating circuit to be operated

independently of the first heating circuit.

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