Application

Sequence of Operation
Wiring Diagrams
42
Siemens Industry, Inc.
BACnet LCM-OAVS, Application 6760
140-1326
2015-07-07
 OCC GEX MIN and UOC GEX MIN to 0.
If these two points are not set to 0, GEX AIR VOL— will read 0 since GEX FLO
COEF was set to 0—will be less than the general exhaust box minimum, resulting
in a false ventilation alarm.
 OCC GEX MAX and UOC GEX MAX left at default or a higher value.
These two points should be set to the highest value: 1) default or 2) OCC SUP
MAX / UOC SUP MAX – small values will result in the supply box not being able to
reach higher flow setpoints.
The application varies the supply airflow as the fume hood flow changes, in order to
maintain the proper room pressurization. The supply airflow is not varied for cooling
purposes; all temperature control is done by the reheat valve.
General Exhaust Only - Operating Without a Supply Box
BTU compensation in Application 6760 will not function without supply airflow. Use
Application 6754.
Wiring Diagrams
Offboard Air Module Wiring.
CAUTION
The LCM-OAVS has two terminal blocks with terminations numbered identically
(terminations 1 through 16). DO NOT mix these up with each other.
If the LCM-OAVS is not connected as shown, it is not resistant to electrical surges. It
is also susceptible to interference from other equipment.
CAUTION
A separate power supply is required if a 4-20 mA sensor is used.
Failure to follow wiring precautions will result in equipment damage.