User Manual

 Configure a heat and refrigeration demand block for controller 3.
Note
s on the example

Configure both heat and refrigeration distribution zones (see Section 10.3).

Controllers 1 and 2 of RMS705B in the example do not act as 2-pipe system;
their sequences act independent of the changeover signal:
Note A 2-pipe system always acts on bus signals. It is impossible to configure a 2-pipe
system that does not receive or route heat and refrigeration demand (both
configured) and heating/cooling signals via KNX.
10.5.2 Mode of operation "Collecting and forwarding heat
demand and H/C changeover"
If configuration parameter "2-pipe heating/cooling system" is enabled, demand
signals are collected on the heating or cooling side.
In addition, the information if the pipes carry cold or hot water is sent from RMS to
other controllers.
The following diagram shows a "2-pipe heating/cooling system" with heat and
refrigeration generation. Changeover of the changeover valve occurs via manual
switch.
Example
1
2
3
4
5
Bus
23
Key
Pos Element
1
Heat generation.
2
Refrigeration generation.
3
Changeover valve.
4
Manual changeover to the changeover valve and function block "H/C changeover".
5
Routing the changeover signal "heating/cooling" via the bus.
Note
s on the example 
Configure both heat and refrigeration distribution zones (see Section 10.3).

Configure both heat and refrigeration demand block.
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Siemens Switching and monitoring device RMS705B CE1P3124en
Building Technologies H/C demand, H/C changeover 01.04.2010