9
2.
For the installer
heating. otherwise the temperature of the return flow must be increased using a mixing pump or valve.
In order to achieve good temperature stratification in the heat accumulator or buffer tank. we recommend setting the
boiler circuit to a 15–20 K differential by means of the return hold-up group SK RH. See the enclosed instructions for
the return hold-up group for guidance values for the setting.
Boiler start-up relief:
A boiler start-up relief must be installed and connected in all cases so that the circulation pump(s) turn off when the
boiler temperature is below 60 °C. This prevents condensation forming in the boiler and extends its service life.
This type of boiler start-up relief is included in the MES INFINITY control system buffer load function module and the
MES
PLUS
WVF+ module.
2.2.5 Circulation pump
Since 2013. regulations in Europe require that new circulation pumps satisfy a minimum level of energy efficiency.
The Energy Efficiency Index (EEI) must be observed.
2.2.6 Heating water
CAUTION
The chemical composition of the heating water must comply with the requirements of
regional legislation. regulations. guidelines and standards. e.g. ÖNORM H 5195. VDI
2035. SWKI BT 102-01.
Applicable for Austria (excerpt from ÖNORM H 5195):
a) According to ÖNORM H 5195 (issue 2010). the condition of the heating water must be checked every 2 years by a
heating technician in order to avoid corrosion and sediment accumulation in the heating system.
b) The pipe lines and heating appliances should be thoroughly flushed through before the boiler is connected.
c) To protect the boiler from contamination from the heating system.
installation of a dirt trap
is required in old or
existing systems with maintenance cocks installed in the return line.
d) If oxygen diffusion or sludge build-up cannot be prevented. the system must be segregated by means of a heat ex-
changer.
e) If antifreeze is used. a minimum volume of 25 % antifreeze is required. otherwise corrosion prevention is not guar-
anteed.
2.2.7 Domestic water (bringing the hot water tank up to temperature
in summer)
There may still be fuel in the boiler after the hot water tank has been brought up to temperature. As a result. measures
must be taken to dissipate the surplus energy – see Section 2.2.4 Heating circuits; Minimum heat consumption.
2.2.8 Combination with automatic boiler (e.g. pellet or oil-fired boiler)
If the LogWIN and an automatic boiler (e.g. pellet or oil-fired boiler) are connected to one flue
without an MES INFIN-
ITY buffer load function module or MES
PLUS
WVF+ module
. in the case of LogWIN a flue gas thermostat (accessory
OK-050) must be installed to prevent parallel operation on the same flue.
