Installation Instructions

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