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System schemes
6 720 645 817 (2010/09)
20
1.9 System scheme 9: one unmixed heating circuit, one DHW circuit, low loss header,
cascade
Hydraulic scheme with controller (schematic diagram)
Fig. 9
AF Outside temperature sensor
CUx Boiler control unit
FW 200 Weather-compensated controller
HP Heating circuit pump (primary circuit)
ICM Cascade switching module
IPM 2 Load switching module for two heating circuits
LP Cylinder primary pump
P Heating circuit pump (secondary circuit)
SF Cylinder temperature sensor
ST ... DHW cylinder
VF Common flow temperature sensor
ZP DHW circulation pump
1 Module position: on the heat source
3 Module position: on the wall
Heating system components
Two Suprapur gas condensing boilers for balanced
flue operation
One unmixed heating circuit
One DHW circuit
Weather-compensated controller
Cascade switching module
Features
The on-site installation of a low loss header is
required to ensure the reliable transfer of the
required heating output.
The FW ... weather-compensated controller is
preferred for its higher utilisation of condensing
technology.
Determine the system water content and select a
corresponding expansion vessel (Æ page 39).
Install safety assembly to DIN 1988.
Function description
The boiler cascade, the unmixed heating circuit and the
DHW circuit are regulated by an FW 200 weather-
compensated controller. This always requires two IPM 2
load switching modules. A 2-wire BUS system enables
communication between the boiler control units, the
controller and the load switching modules.
6 720 643 417-10.1O
3
IPM 2
AF
3
FW 200 ICM
3
CUx
1
ZP
SF
ST ...
LP
VF
TT
P
HP
Suprapur
MKB 240-560
HP
CUx
1
20


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