Systems; Information Regarding All System Examples; Hydraulic Connection; Control - Buderus Logano GE315 Technical Manual

7

Systems

7 Systems
7.1 Information regarding all system
examples
The examples in this section show the options for the
hydraulic connection of the Ecostream cast iron boilers
Logano GE315, GE515 and GE615 without notes on
safety equipment.
For more detailed information regarding the number,
equipment level and control of the heating circuits as well
as the installation of DHW cylinders and other
consumers, see the relevant technical guides.
The DHW heating systems shown can be designed either
with DHW cylinders or with primary store systems.
Information regarding further options for system layout
and engineering aids is available from the consultants at
Buderus Heiztechnik GmbH sales offices (
7.1.1

Hydraulic connection

Measures for controlling the operating flow
temperature
The Logamatic control unit supports thermostream
technology by ensuring the flow temperature of the
Ecostream cast iron boiler. If the temperature falls below
the set level at the boiler sensor when the burner is
operational, the Logamatic control unit actuates the
pumps or actuators. This control function reduces the
flow rate until the operating flow temperature in the
Ecostream cast iron boiler has been reached.
For demand-dependent system proposals with
explanations of the specific function and application
limits, see chapter 7.3 to chapter 7.10 (
Heating circuit pumps
Size pumps in central heating systems in accordance with
current technical rules.
Dirt traps
Deposits in the heating system can lead to local
overheating, noise and corrosion. Any resulting boiler
damage falls outside the warranty obligations.
To remove dirt and sludge, flush an existing heating
system thoroughly prior to installing and commissioning a
boiler. In addition, we recommend the installation of dirt
traps or a blow-down facility.
Dirt traps retain contaminants and thereby prevent
operating faults in control devices, pipework and boilers.
Fit these near the lowest point of the heating system in an
easily accessible position. Clean the dirt traps every time
the heating system is serviced.
36
Position of the strategy flow temperature sensor
The strategy flow temperature sensor (FVS) should be
positioned as close as possible to the boiler system. This
stipulation does not apply if hydraulic balancing has been
provided via a low loss header. Long distances between
the boiler system and the strategy flow temperature
sensor have a negative effect on the control
characteristics, especially in the case of boilers with
modulating burners.
back cover).
7.1.2
The operating temperatures should be controlled with the
Logamatic control unit in weather-compensated mode. It
is possible to control individual heating circuits in room
temperature-dependent mode (with a room temperature
sensor in a reference room). For this, the actuators and
heating circuit pumps are constantly actuated by the
Logamatic control unit. The number and version of heating
circuits that can be controlled depend on the Logamatic
control unit.
The Logamatic control unit can also actuate the burners,
whether they are 2-stage or modulating pressure-jet
burners. Different types of burners can also be combined
page 40 ff.).
in multi burner systems.
The electrical connection of 3-phase burners and 3-phase
pumps must be made on site. The Logamatic control unit
provides control (230 V).
For more detailed information, see the technical guides to
the control units.
6 720 646 864 (12/2010) – Technical guide Logano GE315, GE515 and GE615
The function of a dirt trap can be fulfilled by a
hydraulic balancing line (low loss header).
The temperature sensors for return
temperature raising should be designed as
immersion sensors.

Control