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The display will cycle through all trouble indications, at five seconds per display. Pressing any key (except HUSH) will advance the display
to the next trouble indicator.
If an external horn and/or strobe are connected and configured to signal a trouble condition, they will also sound when a trouble condition
occurs, after a delay, if that configuration option is selected.
When the HUSH key is pressed, the internal buzzer will be silenced for eight (8) hours. If the horn or strobe turn on delays have not
finished then they will also be silenced. If the delays have finished, the HUSH key must be held for three (3) seconds in order to silence
the horn and strobe.
When all indicators have been silenced, the display will show that trouble indications have been silenced for eight hours. After any key is
pressed (or five seconds), the display will return to normal mode.
4.2 Ventilation Control
The ventilation control function operates independently from the alarm function. It provides the ability to configure the DVP-120 for control
of one to three zones. Each zone can respond to gas levels indicated by one or more of the sensors, with configurable turn on and turn
off concentrations (rising and falling) for each gas type. Each zone can also be controlled based on the time of day.
Each zone can be configured to control one, two or all three of the relays and the external horn and strobe if desired. When more than
one zone is controlling a relay it only takes one zone to activate the relay, but all controlling zones must release the relay before it will
turn off.
Each of the relays, horn, and strobe has independent turn-on delays (to ignore short duration, transient gas signals) and turn off delays
(to ensure minimum run times for fans that must run for internal cooling).
4.2.1
Zone Signal Display
When a zone is controlling the horn or strobe and they are activated, the panel will enter ZONE SIGNAL mode during which the horn
and/or strobe will be turned on and the LCD will show the zone that is signaling.
The display will cycle through all zones that are controlling the horn or strobe and are signaling, at five seconds per display. Pressing any
key (except HUSH) will advance the display to the next zone that is signaling.
When the HUSH key is held for three (3) seconds, the horn and/or strobe will be silenced for fifteen (15) minutes. When silenced, the
display will show that zone signals have been silenced for fifteen minutes. After any key is pressed (or five seconds) the display will return
to normal mode.
T r o u b l e
C O
S e n s o r
Figure 4-10 Trouble display
T R O U B L E
F O R
8
H O U R S
Figure 4-11 Trouble Silenced message
Z O N E
S I G N A L
Z O N E
1
Figure 4-12 Zone Signal display
0 2
S I L E N C E D
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