8
2.
For the Installer
Return flow temperature increase:
Required with LogWIN Klassik. It is essential that a return temperature of 61 °C be maintained during heating.
In order to achieve good temperature stratification in the heat accumulator or buffer tank, we recommend that the
boiler circuit be regulated. When using the return hold-up group SK RH 61 in connection with the stratified charge
function (MESplus function module WVF+), regulating the boiler circuit is no longer necessary.
Boiler start-up relief:
A boiler start-up relief must be installed and connected in all cases so that the circulation pump(s) are switched
off when the boiler temperature is below 60 °C. This prevents condensation forming in the boiler and extends its
service life. A boiler start-up relief of this kind is contained in the MESplus control system.
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
Attention!
The chemical composition of the heating water must comply with the requirements of regional legis-
lation, regulations, guidelines and s
tandards, 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 (2010 edition), 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 rinsed 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
exchanger.
e) If antifreeze is used, a minimum volume of 25 % antifreeze is required, otherwise corrosion prevention is not
guaranteed.
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 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 a MESplus
control, in the case of LogWIN a flue gas thermostat (accessory OK-050) must be installed to prevent parallel
operation on the same flue.