Wolf COB - Page 40

40
3062547_201802
Heatingcircuit
The following types of connections shall be selected to ensure the heating water ow
rate through every condensing boiler is as even as possible:
1. For precise hydronic balancing, a line regulating valve can be tted in the supply line
to every appliance.
2. Design the ow and return lines with the same length for the ow and return according
to the Tichelmann system, to ensure the pressure drop in every line is equally high.
Lowlossheader
It must not be possible for the on-site heating circuit pumps or primary pumps to
inuence the function of the condensing boilers. A low loss header should therefore be
installed upstream of the heating water circuit or DHW cylinder circuit. Furthermore,
ensure that the heating water ow rate through the condensing boilers is set lower
than that through the subsequent heating circuit. The ow rate should therefore be set
upstream of the low loss header via a line regulating valve or buttery valve.
Hydraulicseparation
Instead of the low loss header, a heat exchanger can be installed. If pipes are used
which are not impermeable to oxygen, this is a requirement in any case.
DirectlyheatedDHWcylinder
A DHW cylinder is generally connected downstream of the system separation or via a
low loss header.
Cylinder heating is controlled via the cascade controller type KM, to which a cylinder
primary pump and the electronic cylinder sensor are connected.
24 Cascadeoperation-technicaldata/
control/installationinformation
Oil connection
Each oil condensing boiler shall be provided with a suitable oil supply.
If the oil supply is only possible from one oil storage installation, this supply must be
arranged centrally via a suction unit The suction unit shall be installed as close to the
boiler cascade as possible. The oil lines shall be sized in accordance with TRÖl.
Oil storage
installation
Suction unit