Operating Instructions

Fume Hood Monitor Owner's Manual
4-2 Siemens Building Technologies, Inc.
Alarm actions
The FHM contains the following general alarm action sequence:
If…
……
… Then…
……
… The FHM displays…
……
…
the FHM detects an alarm the green LED turns OFF, the
red LED illuminates, ALARM
STATUS (Point 7) changes
from NORMAL to ALARM, the
horn sounds, and the contacts
of the alarm relay open.
LOW FACE VELOCITY, HIGH
FACE VELOCITY, USER
ALARM, or “EEE” depending on
the type of alarm.
How to silence the horn
The user can silence the horn by pressing the Horn Silence button.
When…
……
… Then…
……
… Result…
……
…
the user presses the Horn
Silence button
the horn no longer sounds the red LED will stay illuminated
until the alarm condition is
cleared.
How to indicate an emergency alarm condition
The user can indicate an emergency alarm condition by pressing the EMERGENCY button.
When…
……
… Then…
……
… The FHM displays…
……
…
the user presses the
EMERGENCY button
EMERGENCY (Point 64) will
change from NORMAL to
ALARM.
USER ALARM
How to clear an emergency alarm condition
During an alarm condition, the user can clear the emergency alarm by pressing the
EMERGENCY button.
When…
……
… Then…
……
… The FHM displays…
……
…
the user presses the
EMERGENCY button
EMERGENCY (Point 64) will
change from ALARM to
NORMAL.
current face velocity.