9
2.
For the Installer
2.2.7 Operating with external control
The following requirements must be satisfied for this interface:
– Minimum boiler temperature and start-up relief:
The consumer pumps (heating circuit and domestic water pumps) may only be switched on at a boiler tem-
peratur
e of more than 50 °C if the burner is on and must be switched off at a boiler temperature of less than
45 °C.
– Pump lag time:
A lag time of at least 10 min. must be observed for all consumer pumps and a minimum heat consumption
must be ensured during the burnout phase.
a) Heating requirement (setpoint specification) with 2-point controller
The 2-point controller switches the burner ON/OFF with a potential-free contact via the “external heating re-
quirement” interface of the BioWIN.
b) Heating requirement (setpoint specification) with analogue interface
The controller passes the external boiler temperature setpoint via the analogue 0–10 V interface.
2.2.8 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.
2.2.9 Water-side resistance (pressure loss)
Diagramm 1 Water-side resistance - BW 100–260
BW 100–260
Pressure loss (mbar)
Flow
rate
(m
3
/h)