Application

Sequence of Operation
Application Notes
38
Siemens Industry, Inc.
Application Note, App 2920
140-1307
2015-07-07
 TRACK MODE to 3.
(a value of 3 = ETS Flow Tracking, should be used for both the occupied and
unoccupied modes).
 SUP FLO COEF to 0.
When SUP FLO COEF equals 0, SUP AIR VOL will always read 0, but will never
show as Failed.
 OCC SUP MIN and UOC SUP MIN to 0.
If these two points are not set to 0, SUP AIR VOL— will read 0 since SUP FLO
COEF was set to 0—will be less than the supply box minimum, resulting in a false
ventilation alarm.
This setup is useful when the room has a constant source of supply air from other
equipment or sources not connected to the controller. If you enter this constant supply
air volume value into OTHER SUP, the application will vary the general exhaust airflow
as the fume hood flow changes, in order to maintain the proper room pressurization.
Since all temperature control will be done by the reheat valve, START should be set to
100 to allow the reheat valve to be controlled by the full range of TEMP LOOPOUT and
to prevent the room temperature PID Loop from winding up.