User Manual

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Siemens Universal controllers RMU710B, RMU720B, RMU730B CE1P3150en
Building Technologies Sustained mode (basic type A) 03.10.2011
19 Sustained mode (basic type A)
The function Sustained mode (Precomfort) or Sustained mode (Economy) monitors
one or more physical measured values in operating modes
Precomfort or
Economy, i.e. while the fans are switched off.
 Example with room temperature sensor:
If the room temperature drops below or exceeds a certain level, the fans are
switched on again to prevent cooling down or overheating of the building (or the
room(s))
 Example with room humidity sensor:
If the room humidity drops below or exceeds a certain level, the fans are
switched on again to prevent too dry or too humid room conditions
 Example with room indoor air quality sensor:
The fans are switched at uncomfortable air quality conditions to regain
comfortable room conditions
Embedding the function sustained mode in the operating modes is described in
section 6 "Operating modes".
19.1 Activate function
The function sustained mode (Precomfort), sustained mode (Economy) can be
activated in basic type A.
Main menu > Commissioning > Settings > .... or
Main menu > Settings > Operating mode >
Operating line Range Factory setting
Plant operating mode
Normal operation, Sustained
mode, Recirculated air mode
Normal operation
Plant operating mode
No sustained mode,
Sustained mode
No sustained mode
Additionally, at least one of the following measured values must be available for the
sustained function:
 Room temperature
 Main controlled variable 2
 Main controlled variable 3
 Room indoor air quality as the main controlled variable for the indoor air quality
controller
The sustained function is activated as soon as the corresponding main controlled
variable is available and the plaint operation "sustained mode" is selected. The
main controlled variables for controller 2 or controller 3 can be universal variables
(e.g. relative humidity, absolute humidity, surface temperature, etc).
Note
Setting values