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Note on the plant
diagrams
18/126
Siemens Building Technologies
HVAC Products
3
Fundamentals
3.1
Key technical features
The RVD240 offers 2 key technical features:
• The controller has 14 different plant types preprogrammed.
Subsection 3.1.2 shows the relevant plant diagrams.
• The settings are assigned to different setting levels each of which contains a number
of function blocks with the relevant settings
3.1.1
Function blocks
Setting levels
Function block
End-user
Space heating
Clock setting
End-user d.h.w. heating
Display of actual sensor values
Holiday settings
Indication of errors
Heating engi-
Plant configuration
neer
Space heating
Actuator heat exchanger
Actuator heating circuit
D.h.w. heating
D.h.w. actuator
Assignment of d.h.w.
Extra legionella functions
LPB parameter
Control functions
M-bus parameter
PPS parameter
Test and display
Locking func-
DRT and limitation of the return temperature
tions
Various functions
Locking functions
For each function block, the required settings are available in the form of operating
lines. On the following pages, a description of the individual functions per block and
line is given.
3.1.2
Plant types
The RVD240 has 14 plant types preprogrammed; the functions required for each type
of plant are ready assigned. When commissioning the installation, the relevant plant
type must be selected.
Each plant type is comprised of 2 heating circuits and 1 d.h.w. circuit. When making
use of all possible or practical combinations, the above mentioned total of 14 plant
types are available.
With the number of preprogrammed plant types available, practically all types of heat-
ing plants with district heat connection and own d.h.w. heating can be handled and
controlled.
Elements shown in broken lines (sensors B7 and B71, circulating pump and flow
switch) are optional components.
Basic documentation RVD240
3 Fundamentals
CE1P2384en
27.05.2004
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