Operating Instructions

Laboratory Room Controller Owner's Manual
1-8 Siemens Building Technologies, Inc.
Figure 1-5. One Supply, One Hood.
One Supply, Two Hoods - This configuration works the same way as the basic
arrangement. To add a hood, it is necessary to add a Fume Hood Flow Module (FFM). Also,
it is necessary to adjust the scaling factor that relates to the fume hood flow signal. The
supply air volume and terminal box size should also be reviewed to verify that the required
amount of air can be provided to match the increased exhaust volume, and that the reheat
coils are capable of providing the needed heating for proper temperature control.
Two Supplies, Two or More Hoods - The LRC can handle two supply terminals of the same
or different sizes (refer to Figure 1-6). The controller will modulate their airflows up and down
together, not in sequence. Here, too, the supply flow must be set to balance the fume hood
airflow. When there is no general exhaust from the lab space, you cannot adjust the supply
flow for any other purpose without upsetting room pressurization.