Datasheet

5822 239
G
B
7
2.1 Design in general
2.2 Water connection
System design
Flow temperatures
To keep distribution losses to a minimum,
we recommend that the
H heat distribution system and the
H domestic hot water heating
are designed for a max. of 70 ºC (flow
temperature).
For boilers supplied with a boiler control
unit, limit the max. boiler water
temperature to 87/95 ºC. Changing the
control thermostat can increase the flow
temperature.
Safety temperature
Viessmann boilers correspond to EN 303
and DIN 4702 and all are type-tested.
They are suitable for installation in sealed
heating systems acc. to DIN 4751.
Selection of the rated output
Select boilers acc. to the required heat
demand.
The level of efficiency of low-temperature
and condensing boilers is consistent
across a wide range of boiler loads.
Therefore, the rated output for
low-temperature boilers, condensing
boilers and multi-boiler systems may be
higher than the calculated heat demand
of the building in question.
Standard efficiency
The standard efficiency for Vitogas 100 is
93 % – at a heating system temperature of
75/60 ºC.
The standard efficiency acc. to DIN 4702-8
is the decisive measure to identify the
energy utilisation of a boiler. It includes
all boiler losses (flue gas, radiation and
standby losses) which are predominantly
influenced by the boiler water
temperature and the boiler load.
The values calculated acc. to DIN 4702-8
correspond to the typical use of a heating
system during the course of a year.
Operating mode
Vitogas 100 is operated with modulating
boiler water temperature (lower boiler
water temperature 40 ºC). We generally
recommend you install a mixer because
of the lower boiler water temperature of
40 ºC.
2.2 Water connection
Heating connections
Existing systems
Flush the heating system thoroughly to
remove dirt and sludge deposits, before
connecting the boiler to an existing
heating system.
Otherwise these dirt and sludge deposits
will settle in the boiler, and can lead to
local overheating, noise and corrosion.
Our warranty excludes boiler damage
caused by such deposits. Where
necessary, install dirt traps.
Primary connections
Connect all heat consumers or heating
circuits to the boiler flow and return
connectors. Do not connect to drains or
other connections.
We recommend you install shut-off
valves into the heating flow and return
pipes, so that the entire water contents
are not drained when work is required on
the boiler or heating circuits.
Heating circuits
For underfloor heating, we recommend
the use of impermeable pipes to prevent
the infusion of oxygen through the pipe
walls. Provide system segregation in
underfloor heating systems for plastic
pipes acc. to DIN 4726 which are not
impermeable to oxygen.
Plastic radiator pipes
We also recommend the installation of a
temperature limiter to limit the maximum
temperature for plastic heating pipework
in heating circuits with radiators.
We supply separate heat exchangers for
this purpose.
Underfloor heating systems and heating
circuits with a large water content should
also be connected via mixers .
Low-temperature and ultra-low-
temperature boilers should be controlled
by separate control units, e.g.
Vitotronic 050.
Heating circuit pumps
Heating circuit pumps in heating systems
with rated output > 50 kW should be
equipped and designed in a way that
matches the electrical power
consumption to the operational
throughput requirements in at least three
stages, if no safety concerns relating to
the boiler make alternative demands.
Application examples
" See chapter 3.1 These application examples are merely
recommendations, and should therefore
be checked to ensure that they are
complete and fully functioning on site.
Connect three-phase consumers via
additional contactors.