Operating Instructions

Fume Hood Controller Owner’s Manual

26 Siemens Building Technologies, Inc.

Point Database

Chapter 3 presents a description of the Fume Hood Controller point database including point

descriptors, point addresses, and a listing of applications in which each point is found.

Address Descriptor Application Description

01 CTLR ADDRESS 941, 942 Identifies the controller on the FLN trunk. Valid values: 0

through 98.

02 APPLICATION 941, 942 The identification number of the Application running in the

controller.

04 FACE VEL 941, 942 The calculated average air velocity through the face of the

fume hood.

05 LOW ALM 941, 942 This point displays an ON or OFF status. When the face

velocity goes below the value specified at LOW ALM LMT for

the time specified in ALARM TIME, the point goes into an

alarm state (ON); the red LED is illuminated, the alarm

sounds, and the message LOW Face Velocity displays at

the ODP.

06 HIGH ALM 941, 942 This point displays an ON or OFF status. When the face

velocity goes above the value specified at HI ALM LMT for the

item specified in ALARM TIME, the point goes into an alarm

state (ON); the red LED is illuminated, the alarm sounds, and

the message HIGH FACE VELOCITY displays at the ODP.

07 EMER ALM 941, 942 This point displays an ON or OFF status that indicates if the

EMERGENCY PURGE button on the ODP has been pressed.

When the operator presses the EMERGENCY PURGE button,

the point is ON, the red LED is illuminated, the alarm sounds,

and EEE and EMERGENCY MODE display at the ODP. If

pressed again, then the point is OFF. This point can be

commanded by a field panel.

08 GEN FAILURE 941, 942 Indicates a hardware failure (e.g., the sash sensor) with an ON

or OFF status. The red LED is illuminated; the alarm sounds,

and FFF and GENERAL FAILURE display at the ODP.

09 FVEL STPT 941, 942 The face velocity setpoint in feet per minute (m/s) that is

maintained by the Fume Hood Controller. Valid values: 0

through 225 ft/min (0-1.2954 m/s).

10 HI ALM LMT 941, 942 The value above FVEL STPT, in percent, at which the red LED

and audible alarm are activated on the ODP. This point is the

setpoint for HIGH ALM. Valid values: 100 through 255%.