What you should know about your heating system
2
Logamatic 4121, 4122 and 4126 - Subject to technical modifications.
9
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
up
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
to
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
a
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
a
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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