Ventilation Control; Zone Signal Display - Macurco DVP-120C User Instructions

Macurco DVP-120C Manual
When the HUSH key is pressed, the internal buzzer will be silenced for 15 minutes. 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 calibration due warning indication have been
silenced for 15 minutes. After approximately 5 seconds the display will return to normal mode.
When in normal mode, for detectors with Calibration Overdue silenced, panel will display "Cal.Req" instead of gas
reading.

4.12 Ventilation Control

The ventilation control function operates independently from the alarm function. It provides the ability to configure
the DVP-120C 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).
A VFD may be enabled and controlled by the DVP-120C output relays. This allows an operator to change fixed
speeds for a VFD if it's used as a stand-alone control.
For example, an application where VFD is controlling the speed of a fan. An operator can close relay 1, 2, or 3 to set
the fan speed. If relay 1 is closed, the VFD will operate at 50%, If relay 2 is closed, the VFD will operate 75%, If relay 3
is closed, the VFD will operate at 100%.

4.12.1 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.
REV – 1.0
C a l. R e q S I L E N C E D
F O R 1 5 M i n u t e s
Figure 4-19 Calibration Required Silenced
Z O N E S I G N A L
Z O N E 1
[34-8708-4770-8 ] 30 | P a g e