Windhager FireWIN - 2. Operation; 2.1 Functional description, function elements and operating controls

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2. For the Installer
Diagramm 3 water-side resistance - FireWIN
FireWIN 90, FireWIN 120
Pressure loss (mbar)
Flow rate (m
3
/h)
2.2.7 Heating water
a) The chemical composition of the heating water must meet the specifications of ÖNORM H 5195 Part 1 or
VDI 2035 P1. According to ÖNORM M 5195 Part 1 (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 (mesh size 0.5 mm) 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 20 % antifreeze is required, otherwise corrosion prevention is not
guaranteed.
2.2.8 Water-side resistance (pressure loss)