Operating Instructions

Controlling Laboratory Air Flow
Siemens Building Technologies, Inc. 3-13
Scheduling Occupancy
The LRC fits into the APOGEE as an LCTLR point. This is the same interface used for other
room controllers and Fume Hood Controllers (FHCs). Scheduling features in the field panel
and Insight allow you to set up regular "DAY" and "NIGHT" commands to any LCTLR device.
Inside the LRC, those commands display as NET OCC CMD (Point 29). The LRC uses NET
OCC CMD, along with any other active occupancy information to set the state of OCC.UOC
DO5. If using ventilation setback without a schedule, manually command NET OCC CMD to
the unoccupied state. This will allow other occupancy commands to operate.
Manually Commanding Occupancy
A building operator may have a reason to override the automatic control system, and
manually force the occupancy state of the room. For safety reasons, it is not possible to
manually command the OCC.UOC DO5 point that is used to select the ventilation rates.
Commanding an LRC to Occupied Mode
When commanding an LRC to occupied mode, use CIS to set the point NET OCC CMD to
OCC. This command will last until it is released or changed through CIS or until a command
comes in from the network. Another method is to use Insight or the field panel to command
the state of the controller's LCTLR point to "DAY". This command is transferred to the NET
OCC CMD point in the LRC. This manual command will block any automatic occupancy
commands (like a schedule) until the point is released.
Commanding an LRC to Unoccupied Mode
When commanding an LRC to unoccupied mode, first determine why the room is in the
occupied mode. Use the Occupancy report to check each command source. For each one
that indicates occupancy, make sure there is a reason why this is not the right state. If you
decide it is appropriate, override the state of the command source using the following
methods:
• NET OCC CMD - Set Point 29 from CIS, or command the LCTLR to "NIGHT" from
the field panel or from Insight.
• OCC SWIT DI2 - Temporarily disable the switch using Point 18, OCC SWIT ENA.
Remember to enable it again when the problem is corrected.
• BUTTON CMD - In the room, press the occupancy button, or use Insight or the field
panel to manually set the value of BUTTON CMD to UNOCC. When the value is set,
release the point.
• HOOD VOL - If possible, close the fume hood, otherwise, temporarily set the value of
HOOD OCC VOL to zero. This disables the fume hood effect on occupancy.
Remember to return the point to its original value after the problem is corrected.