Operating Principle - Siemens RMB795B Basic Documentation

Example: Changeover by
outside temperature
Setting values
Note
Configuration error
Impact of configuration
parameters
Example of plant
Siemens
Building Technologies
When value "Heating off/cooling on" is exceeded, the H/C changeover signal is
changed to cooling. When value "Heating off/cooling off" is breached, the H/C
changeover signal is changed to heating. "Attenuation can be set for the input
signal.
Main menu > Commissioning > Settings > Heating/cooling ch'over >
Operating line
Heating on/cooling off
Heating off/cooling on
Attenuation
* depending on unit
** Variable units.
If a digital input is used for changeover, operating line "Heating on/cooling off" = 1
and "Heating off/cooling on" = 0 must be set (factory setting).
If at the same time changeover is configured by date and digital input, the controller
operates using the changeover by digital input.

11.6.4 Operating principle

If only the configuration parameter "2-pipe heating/cooling system" is activated,
collection of the demand signals is only made on the cooling or heating side.
If, in addition, "H/C changeover" is activated, the information whether the pipes
carry hot or cold water is sent to the RXB/RXL room controllers.
The plant diagram below shows a "2-pipe heating/cooling system" with heat and
refrigeration generation. The diverting valve is switched over with a manual switch:
Central control unit RMB795B
Distribution zones
Area
*
*
0...100 h
Factory setting
**
**
0 h
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CE1P3122en
18.01.2012