Volume Flow Balancing Vav - Siemens RMB795B Basic Documentation

Introduction
Prerequisites
Forced control
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Siemens
Building Technologies
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Volume flow balancing VAV

Forced control signals on the ventilation unit to set maximum air volume is required
to setup the air volume. You can override the volume flow controller (open) for the
corresponding air distribution zone regardless of the current available energy
demand signals for heating or cooling. Activating the "Simulation VAV supply air" or
"Simulation VVS extract air" switches on the supply air or extract air fan
respectively. The fans should be controlled to provide sufficient pressure prior to
the volume flow controller with the highest pressure loss so that even it can
achieve the maximum volume flow.
• All devices are installed, and commissioning is completed
• Communications between the devices is operational and all zone settings
(geographical zone/air distribution zones) have been checked.
Observe the following during commissioning:
• Setting values dependent on time, such as the pre-command of fire protection
dampers or dampers, switch-on delay, fans, ramp-up time and other setting
values that may have an impact on plant start-up behavior.
• Time-related specifications such as overshoot time when using electric heating
coils.
• Conduct function and communication tests of room control and the
corresponding volume flow controllers.
• KNX communications between the primary air handling unit and individual room
control: Data exchange of heat and refrigeration demand signals and request
signals (temperature or pressure control) are checked and fully operational.
• Ensure when switching on the primary air handling unit that the volume flow
controller is open and the fans cannot start when the dampers are closed.
Failure to comply with these items may result in damage to the aggregates and
plant parts!
All volume flow controllers assigned to room groups 1-10 are controlled if
RMB795B triggers the function.
Main menu > Air flow balancing >
Operating line
Simulation VAV supply air
Simulation VAV extract air
For safety reasons the simulation is reset when entering the extra configuration!
The volume flow controller can control the corresponding room groups through
forced controlled of the air volume flow balancing. The selection "Vmax" opens all
VAV dampers for the corresponding air distribution zone. This allows you to make
the optimum settings for required air flow. To exit the simulation, select "---". This
resets the simulation mode.
Central control unit RMB795B
Volume flow balancing VAV
Comments
----, Vmax
----, Vmax
CE1P3122en
18.01.2012