What you should know about your heating system
2
Logamatic 4211 - 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 monitored.
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 valve between the boiler 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 valve into the hot flow
water, to achieve the required lower temperature. It is
important to note that heating circuits with three-way
valves require an additional pump. This pump enables
the second heating circuit to be operated independently
of the first heating circuit.
