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
T
T
P
HP
Suprapur
MKB 240-560
HP
CUx
1