Macurco DVP-120 User manual

Macurco™ DVP-120 / DVP-120M
Detection and Ventilation Control Panel
User Instructions
IMPORTANT: Keep these User Instructions for reference.

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TABLE OF CONTENTS
1Introduction 4
1.1 GeneralInformation 4
1.2 DVP-120M Addressable Detection and Ventilation Control Panel 4
1.3 Macurco MRS-485 Modbus Adapter 4
1.4 Features 5
1.5 Specifications 5
2Installation & Connection 5
2.1 MountingtheDVP-120 6
2.2 General Wiring Information 6
2.3 MainpowerConnection 7
2.4 Remote Sensor Connection 8
2.5 RelayConnection 10
2.6 Horn&StrobeConnection 10
2.7 Interfacing Macurco Sensors 11
3Operation 15
3.1 Initial Operating Mode 15
3.1.1 Status Light Display 16
3.1.2 UserInterface 16
3.1.3 NormalStatusDisplay 17
3.1.4 ALARMStatusDisplay 17
3.1.5 WarningStatusDisplay 18
3.1.6 Trouble Status Display 18
3.2 Ventilationcontrol 19
3.2.1 ZoneSignalDisplay 19
3.3 Setting the System Configuration 19
3.3.1 SystemMenu 20
3.3.2 Configure System Submenu 21
3.3.2.1 SetTimeofDay 21
3.3.2.2 SetdayofWeek 21
3.3.2.3 Load Default Configuration 22
3.3.2.4 ChangePassword 22
3.3.2.5 Configure Sensor Type 23
3.3.2.6 Enterpassword 25
3.3.3 Configure Sensors Submenu 25
3.3.3.1 SensorSummary 25
3.3.3.2 SensorType 26
3.3.3.3 AlarmSetPoint 26
3.3.3.4 WarningSetPoint 26
3.3.3.5 Range 27
3.3.4 Configure Relays, Horn & Strobe Submenu 27
3.3.4.1 RelaySummary 27
3.3.4.2 RelayMode 27
3.3.4.3 RelayTurnOnDelay 27
3.3.4.4 RelayMinimumOnTime 28
3.3.5 Configure Horn Submenu 28
3.3.5.1 HornSummary 28
3.3.5.2 HornTurnOnDelay 28
3.3.5.3 HornMinimumOnTime 28
3.3.6 Configure Strobe Submenu 28
3.3.6.1 StrobeSummary 28
3.3.6.2 StrobeTurnOnDelay 29
3.3.6.3 StrobeMinimumOnTime 29
3.3.7 Configure Zones Submenu 29
3.3.7.1 ZoneControls 29

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3.3.7.2 ZoneGroupType 30
3.3.7.3 TimedDaySelection 30
3.3.7.4 StartTime 31
3.3.7.5 StopTime 31
3.3.7.6 SensorSelection 31
3.3.7.7 RisingTripPoint 31
3.3.7.8 FallingTripPoint 32
3.3.7.9 MultipleSensorMode 32
3.3.7.10 Multiple Sensor Quorum 32
3.3.8 Configure Signals Submenu 32
3.3.8.1 Alarm Signal Summary 32
3.3.8.2 AlarmBuzzerSignal 32
3.3.8.3 AlarmHornSignal 33
3.3.8.4 AlarmStrobeSignal 33
3.3.8.5 Warning Signal Summary 33
3.3.8.6 WarningBuzzerSignal 34
3.3.8.7 WarningHornSignal 34
3.3.8.8 Warning Strobe Signal 34
3.3.8.9 Trouble Signal Summary 34
3.3.8.10 Trouble Buzzer Signal 34
3.3.8.11 Trouble Horn Signal 35
3.3.8.12 Trouble Strobe Signal 35
4Troubleshooting 35
4.1 System Status Light Flashing 35
4.1.1 Input Channel Trouble 35
4.1.1.1 NoSensor 35
4.1.1.2 Wrong Sensor Type 36
4.1.1.3 SensorTrouble 36
4.1.1.4 FaultyWiring 36
4.1.1.5 ResettableFuse 36
4.1.2 Internal Controller Board Trouble 36
4.2 Timed ventilation problem 36
4.3 NoPower 36
4.4 LCDDisplayunreadable 37
4.5 The Keypad does not respond (LCD shows KEYS LOCKED) 37
4.6 The Keypad does not respond after silencing an Alarm, Warning or Trouble 37
4.7 Afterapowerfailure 37
4.8 ModbusApplication 37
5Macurco Gas Detection products limited warranty 39
6Appendix AQuickSet-Up 40

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LIST OF WARNINGS
! WARNING
Each person using this equipment must read and understand the information in these User Instructions before use. Use of this equipment by
untrained or unqualified persons, or use that is not in accordance with these User Instructions, may adversely affect product performance and
result in sickness or death.
This equipment helps monitor for the presence and concentration level of certain specified airborne gases. Misuse may produce an inaccurate
reading, which means that higher levels of the gas being monitored may be present and could result in overexposure and result in sickness or
death. For proper use, see supervisor or User Instructions, or call Macurco Technical Service.
DVP-120 may not function effectively below 32°F (0°C) or above 104°F (40°C). Using the equipment outside of this temperature range may
adversely affect product performance and result in sickness or death.
High voltage terminals (120/240 VAC) are located within the DVP-120, presenting a hazard to service technicians. Only qualified technicians
should open the DVP-120 case and service the internal circuits. Ensure power is removed from the DVP-120 prior to servicing the unit.
Immediately exit any environment that causes an alarm condition on the sensor. Failure to do so may result in sickness or death.
Each time the unit is turned on it performs a self-test, which activates the audible and visual alarms. If the self-test fails, or all the alarms do not
activate, do not use. Failure to do so may adversely affect product performance and result in sickness or death.
Do not cover or obstruct audible alarm opening or visual alarm LED. Doing so may adversely affect product performance and result in
sickness or death.
Do not disassemble unit or attempt to repair or modify any component of this instrument. This instrument contains no user serviceable parts,
and substitution of components may adversely affect product performance and result in sickness or death.
Use only for monitoring the gases which the sensors and equipment are designed to monitor. Failure to do so may result in exposures to gases
not detectable and result in sickness or death. For proper use, see supervisor or User Instructions, or call Macurco Technical Service.
1. Introduction
1.1 General Information
The DVP-120 exhaust fan controller, in conjunction with Macurco™ gas transducers, provides automatic controls to help maintain an
acceptable environment in parking garages or other facilities. The DVP-120 system is designed to meet specifications for safety in
enclosed parking garages, including the Uniform Building Code and OSHA 50ppm CO requirements. The DVP-120 can control up to
twelve gas sensors in any combination (i.e. CO, NO2, EX). The DVP-120 is ready for operation after the wiring is complete and the
user system configuration is entered.
1.2 DVP-120M Addressable Detection and Ventilation Control Panel
The DVP-120M is a Modbus-Enabled Detection and Ventilation Panel with up to 87 Modbus addressable sensors on three channels of
29 sensors per channel, plus the original 12 analog 4-20mA sensor channels. The DVP-485 Modbus adapter increases the capacity of
the DVP-120 from 12 detectors to 99. System wiring includes 4-20mA current loop and RS-485 serial interface. System wiring includes
main power connection for the DVP-120M, the fan control and alarm connections from the DVP-120M to the building ventilation and
automation systems. The RS-485 serial interface is from the DVP-120M to the remote detectors. Power to the detectors is provided by
isolated/remote low voltage power supply.
1.3 Macurco MRS-485 Adapter
The Macurco MRS-485 adapter is an accessory used to convert the 4-20mA analog signal from Macurco 6-Series type detectors to a
digital signal for use with the DVP-120M and other multipoint addressable systems. The Macurco MRS-485 simply plugs into the back
of the detector and a single screw fastens it in place. The MRS-485 accepts the 4-20mA output and is powered from the same
connection as the detector. The MRS-485 is not intended for use in hazardous locations or industrial applications such as refineries,
chemical plants, etc. Do not mount the MRS-485 where the normal ambient temperature is below 0°F or exceeds 125°F (-18°C or
above 52°C). The MRS-485 mounts to a Macurco 6-Series detector installed on a 4” x 4” electrical box electrical box supplied by the
contractor.
Each person using this equipment must read and understand the information in these User Instructions before use. Use of this equipment by
untrained or unqualified persons, or use that is not in accordance with these User Instructions, may adversely affect product performance and result
in sickness or death.
! WARNING

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1.4 Features
Externally visible LCD display showing the status of each transducer and relay
External keypad for user selection of the transducer/alarm display and setting the configuration (password protected)
Up to three ventilation control zones can be defined
Each zone can be controlled based on transducer signals and/or time of day
Each relay is configurable for delay before activation and minimum on time
Fail safe operation can be implemented
Lockable NEMA 1 type enclosure
Modular input and output connectors
Three RS-485 digital input channels - 29 addressable sensors per channel*
Compatible with all Macurco 6-Series gas detectors and MRS-485 adapter*
Twelve analog (current loop) input channels
Three 10A, 240 VAC SPDT fan/alarm relays
Drivers for external Horn and Strobe
ETL Listed to UL 508A, CAN/CSA-C22.2 No. 14-13
*DVP-120M only
1.5 Specifications
Size: 10.5” x 12.5” x 2.” (267 mm x 318 mm x 51 mm)
Weight: 6 ½ lb (2.9 kg)
Enclosure: NEMA 1 Type
Operating Temperature: 32 to 104°F (0° to 40°C )
Operating Humidity: 0% to 95% RH non-condensing
Power Input: 90 – 250 VAC, 1 Amp, 47 – 63 Hz, single phase
Relay Rating (3): SPDT, 120/240 VAC, 10 A resistive
LCD Display: 2 rows of 16 characters with backlight
Status Indicators (LED): Power, ALARM/warning, Hush, Relay 1, Relay 2 & Relay 3
Audible indicator: Internal buzzer, 90 dBA at 1ft
External Drivers (2): 24VDC, maximum 250 mA
Carbon Monoxide (CO) Range: 0 – 200 PPM
Nitrogen Dioxide (NO2)Range: 0 – 20 PPM
Combustible (EX) Range: 0 – 50% LEL
Ammonia (NH3) Range: 0 – 100 PPM
Hydrogen Sulfide (H2S) Range: 0 – 50 PPM
Refrigerant (REF) Range: 0 – 1,000 PPM
Oxygen (O2) Range: 0 – 25%
Carbon Dioxide (CO2) Range: 0 – 5,000 PPM
Wild Card (WC) Range: Variable
Relay On Delay: 0 – 15 minutes in 1 second increments
Relay Minimum Run Time: 0 – 15 minutes in 1 second increments
2Installation & Connection
Gas detection and exhaust fan control is provided by a Macurco™ DVP-120 system. System wiring includes the main power
connection for the DVP-120, 4-20mA current loop and 24VDC power connections between the remote sensors and the DVP-120, the
fan control connections and/or alarm connections from the DVP-120 to the building ventilation and automation systems. The DVP-
120M also includes the RS-485 serial interface from the DVP-120M to the MRS-485 and remote detectors. Power to the MRS-485 and
detectors is provided by isolated/remote low voltage power supply.
The system configuration is entered by the user through the LCD display and keypad. The system display provides the user with the
system status, and the status of each configured sensor. In addition, all control functions of the DVP-120 may be accessed through the
system display and keypad.

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! WARNING
This equipment helps monitor for the presence and concentration level of certain specified airborne gases. Misuse may produce an inaccurate
reading, which means that higher levels of the gas being monitored may be present and could result in overexposure and result in sickness or
death. For proper use, see supervisor or User Instructions, or call Macurco Technical Service.
This DVP-120 system should be used with Macurco™ transducers and each unit will measure the level of the target gas (i.e. CO, NO2,
EX) and provide this information to the DVP-120 over a 4-20mA current loop. The transducers operate on low voltage (24VDC). All
power and signal connections for the transducers are provided from the DVP-120 control panel, via unshielded four conductor cable.
For DVP-120M Modbus applications use shielded 3-conductor wire with one twisted pair providing a pair for signal (A & B), common
(COM) and shield ground (SHD) connections. The DVP-120 control panel provides three relays which can be used for ventilation fan
control or alarm signaling. These relays (SPDT - Form C) are for pilot duty only, capable of switching 10 amp loads up to 240 VAC.
Main power wiring should conform to national and local electrical codes, and may require separate inspections and certification.
Contact your local building authority for further details.
! WARNING
DVP-120 may not function effectively below 32°F (0°C) or above 104°F (40°C). Using the equipment outside of this temperature range may
adversely affect product performance and result in sickness or death.
2.1 Mounting the DVP-120
Mounting holes are provided in the DVP-120 case at the four corners. The top two are keyhole shaped so that the panel can be hung
and then the two bottom screws driven to hold the panel. See figure 2-1. The panel should be mounted with sufficient space all around
for access to Conduit entry holes provided on the top, bottom and right side of the panel.
Figure 2-1 Mounting holes
Typical coverage for CO, CO2 and NO2 sensors is 5,000 sq. ft. (464.5 sq. m), 900 sq. ft. (83.6 sq. m) for combustibles and other
toxic gases (see the User Instructions of each sensor type for location and coverage details). Extra sensors may be needed near
areas where people work, such as toll booths. Macurco provides only the control panels and sensors. Fans, relays, and other
devices are provided by the contractor. See the appropriate building code for the size of fans and air changes per unit of time.

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Figure 2-2 Typical Layout
2.2 General Wiring Information
! WARNING
High voltage terminals (120/240 VAC) are located within the DVP-120, presenting a hazard to service technicians. Only qualified technicians should
open the DVP-120 case and service the internal circuits. Ensure power is removed from the DVP-120 prior to servicing the unit.
With the exception of the safety ground, all field wiring is completed via modular connectors (provided). After wiring, simply plug the
modular connectors into the matching connectors on the printed circuit board (PCB).
DVP-120
The power and signal connections to the remote mounted sensors should be size AWG18 (minimum) for short runs. Refer to Table 2-2
for recommended wire gauges. Four conductor cables may be used in all cases since the DVP-120 employs DC power for remote
sensors to help prevent electrical noise from interfering with the sensor output signal.
Do not bundle sensor power and/or signal connections with other AC power cables to prevent electrical interference. If other AC power
connections must be bundled with the DVP-120 sensor cables, the sensor connections should be made with two twisted pairs of the
appropriate gauge, with an overall foil and braid shield. All shields should be terminated at the DVP-120 end of the cable only. A
ground stud is provided near the bottom left corner of the panel.
DVP-120M
The power connections to the remote mounted sensors and MRS-485 should be size AWG18 (minimum) for short runs. Refer to Table
2-2 for recommended wire gauges. The Macurco MRS-485 output is connected via a four terminal screw type connector. The MRS-485
adapter is wired in the standard 2W-Modbus circuit definition with selectable built-in terminating resistors at the ends of the RS-485
bus. The power for the MRS-485 adapter is connected via a two terminal screw type connector, 12 to 24 VAC or 12 to 24 VDC and no
polarity. Running the Modbus cable adjacent to or in the same conduit with high voltage wires is not recommended as there may be
interference from the high voltages.
2.3 Main Power Connection
The main power cable should be routed into the bottom left conduit entry. Macurco recommends a minimum wire size of AWG18 and
the wire insulator must be rated for 140F (60C) service. The modular connector will accept wire from 12 to 24 AWG. The safety
ground wire should be secured to the ground stud at the bottom left of the cabinet with the lock washer and nut supplied. Use a ring
terminal for the ground connection. Refer to Table 2-1 for DVP-120 power connections. The line and neutral wires should be stripped
1/4 in. (6.5 mm), insert the wire into the wire cavity of the modular connector and tighten the screw clamp. Ensure that the wire cannot
be easily pulled from the connector. Plug the modular connector into AC~ on the PCB and ensure that it latches into the header
properly.
Signal Connector Pin Number
Line (120/220/240/250 VAC) AC~ 3
Neutral AC~ 1
Ground Ground Stud n/a
Table 2-1 Main Power Connections

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Figure 2-3 System Wiring Diagram
2.4 Remote Sensor Connection
DVP-120
Each remote sensor is connected by a four-wire connection – two wires for DC power and two wires for the 4 – 20 mA loop connection.
Be sure that the 4-20mA output on each sensor is set to “On”. The sensors are connected to the control panel PCB with modular
connectors, two sensors per connector. See Figure 2-5 for a view of a typical sensor connector. Refer to Table 2-2 for wire size
recommendations.
Figure 2-4 DVP-120 Internal View and DVP-120M with DVP-485 Modbus Adapter

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Figure 2-5 Sensor Interface Connector – Channels 5 and 6
Each 8-terminal sensor modular connector may be disconnected from the PCB connector to ease wire installation. The terminals will
accept wire from 16 to 28 AWG. To install a wire, strip back approximately 0.25 in. (6 mm) of insulation, and insert the bare wire into
the terminal. Tighten the screw clamp and ensure that the wire cannot be easily pulled from the connector. Connector to sensor C1
through C12 correspondence to all 12 input channels.
Wire gauge Maximum Run Length (ft.)
(feet) (meters)
18 500 152
16 800 244
14 1250 381
Table 2-2 Recommended Wire Gauge
DVP-120M
A MODBUS over Serial Line Cable should be shielded for best performance. The shield should be connected on each detector at SHD
terminal and connected to a ground terminal or chassis only at one end of the bus. An RS485-MODBUS must use a balanced pair (for
A-B) and a third wire (for the Common). For RS485-MODBUS, Wire Gauge must be chosen sufficiently wide to permit the maximum
length (1000 m or 3281ft). AWG 24 is always sufficient for the MODBUS Data. Category 5 cables may operate for RS485-MODBUS, to
a maximum length of 600 m 1968.5 ft. For the balanced pairs used in an RS485-system, wire with a characteristic impedance of higher
than 100 Ohms may be preferred, especially for 19200 and higher baud rates.
Note: It is recommended to always use twisted wires to reduce noise and allow for reliable data communication over greater distances.
Use at least 3-conductor wire with one twisted pair providing a pair for signal (A & B) and common (COM) connections.
For best performance use shielded 3-conductor wire with one twisted pair providing a pair for signal (A & B), common (COM) and
shield ground (SHD) connections.

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Topology
An RS485-MODBUS configuration without repeater has one trunk cable, along which devices are connected, directly (daisy chaining)
or by short derivation cables. The trunk cable, also named “Bus”, can be long. Its two ends must be connected on Line Terminations.
(see Line Termination - End of Line Resistor section). The use of repeaters between several RS485-MODBUS is also possible.
Length
The end to end length of the trunk cable must be limited. The maximum length depends on the baud rate, the cable (Gauge,
Capacitance or Characteristic Impedance), the number of loads on the daisy chain, and the network configuration (2-wire). For a
maximum 9600 Baud Rate and AWG26 (or wider) gauge, the maximum length is 1000m 3281ft. The derivations must be short, never
more than 20m 65.5ft. If a multi-port tap is used with n derivations, each one must respect a maximum length of 40m 131ft divided by
n.
Grounding
The Common circuit (COM) must be connected directly to protective ground, preferably at one point only for the entire bus.
Power Wire
All field wiring is completed via modular connectors (provided). After wiring, simply plug the modular connectors into the matching
connectors on the MRS-485. The power connections to the remote mounted detectors should be size AWG18 (minimum) for short
runs. Since Macurco detectors are rated for operation between 12 and 24 VDC or VAC, the voltage drop between the power supply
and the MRS-485 should not be an issue if the recommended power wire gauge guidelines below are followed. The terminals will
accept wire from 16 to 28 AWG. To install a wire, strip back approximately 0.25 in. (6 mm) of insulation, and insert the bare wire into
the terminal. Tighten the screw clamp and ensure that the wire cannot be easily pulled from the connector.
Maximum Run Length
Wire gauge (feet) (meters)
18 500 152
16 800 244
14 1250 381
2.5 Relay Connection
All poles of the three relays are available at the modular connector R1 R2 R3 (see Figure 2- for details). R1 R2 R3 is a 9-position
variant of the high voltage modular connector used for power input. Each terminal can accommodate a wire size 12 to 24 AWG.
Figure 2-6 Relay Connector

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To install the wiring for the relays, disconnect the connector from the header on the PCB. Strip the insulation of each wire back
approximately 1/4 in. (6.5 mm), insert the bare wire into the terminal and tighten the screw clamp. Ensure that the wire cannot easily be
pulled from the connector.
2.6 Horn & Strobe Connection
The external horn and strobe connections are available at the modular connector S H (see Figure 2- for details). S H as a 4-position
connector, similar to the sensor interface connectors.
Figure 2-7 Horn & Strobe Connector
To install the wiring for the horn or strobe, disconnect the connector from the header on the PCB. Strip the insulation of each wire back
approximately 0.25 in. (6 mm), insert the bare wire into the terminal and tighten the screw clamp. Ensure that the wire cannot easily be
pulled from the connector. When all wires are connected, seat the modular connector into the PCB header; ensure that the latch
engages. Refer to Table 2-3 for recommended wire gauge vs. run length for the horn & strobe functions (maximum 2.5 volt drop in the
wire). The Strobe and Horn circuits are Class 2 control circuits so Class 2 conductors should be used.
Wire gauge Maximum Run Length (ft.)
(feet) (meters)
24 200 61
22 340 103
20 480 147
18 850 215
Table 2-3 Wire gauge for Horn & Strobe functions
! WARNING
Immediately exit any environment that causes an alarm condition on the sensor. Failure to do so may result in sickness or death.
2.7 Interfacing Macurco Sensors
DVP-120
Macurco sensors with current loop outputs may be used with the DVP-120. See macurco.com for information on compatible Macurco
gas transducers. See specific information on other manufacturer’s transducers.
Power connections to Macurco sensors used with the DVP-120 are polarity-insensitive (no polarity), since a bridge rectifier is
connected to the power input terminals. All sensors used with the DVP-120 panel employ screw clamp terminal blocks for power and
signal connections. Polarity of the current loop connections is marked on the printed circuit board of the sensor.

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DVP-120M
The Macurco MRS-485 Adapter converts the Macurco 6-Series 4-20mA analog output to a digital output for use with the DVP-120M
and other addressable network systems
1. Remove the 4-20mA/Power plug from the Macurco 6-Serires gas detector
2. Plug the MRS-485 adapter into the empty socket.
3. Install the provided MRS-485 screw.
4. See the wiring diagram for wire connection.
Connection
The Macurco MRS-485 output is connected via a four terminal screw type connector. The MRS-485 adapter is wired in the standard
2W-Modbus circuit definition with selectable built-in terminating resistors at the ends of the RS-485 bus. The power for the MRS-485
adapter is connected via a two terminal screw type connector, 12 to 24 VAC or 12 to 24 VDC and no polarity.
Note: Running the Modbus cable adjacent to or in the same conduit with high voltage wires is not recommended as there may be
interference from the high voltages.
DIP Switches and Addressing
Each MRS-485 (and the partner gas detector) must be configured to a unique address. If there are 10 detectors on the serial line, then
10 unique addresses must be used, one for each detector. To set the address use the eight DIP switch positions. For each unit choose
the value from 1 to 247 (see chart) and set the eight switches to match the address. UP means ON or 1 and DOWN means OFF or 0.

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For example, to configure a unit as address “50”, set switches “2, 5, 6” (see table) to ON or in the up position (01001100). See page 11
for a list of applicable addresses and dip-switch settings.
Line Termination - End of Line Resistor
The MRS-485 adapter is wired in the standard 2W-Modbus circuits definition with selectable built-in terminating resistors at the ends of
the RS-485 bus. The MRS-485 provides integral termination for end of line resistors (EOL). The MRS-485 termination uses 4-pin
connector with jumper to select termination: The user selects no termination or one of the two Modbus line termination options. The
MRS485 has two line termination options provided onboard that should cover most situations.
Place the EOL jumper on one of the following positions:
1 = 100 ohm
2 = 120 ohm
N = No termination (default)
Normal Operation
The MRS-485 will monitor the 4-20 mA current output of the detector. At power up and during its warm-up period, the 6-Series detector
will communicate its sensor type over the 4-20 current output using a custom protocol. The MRS-485 will automatically register each 6-
Series detector as it is programmed with information about all the detectors to which it can be connected. The MRS-485 will use this
information to determine the gas level sensed by the 6-Series detector by measuring the 4-20 mA current-loop output during normal
operation of the detector.
1. When the LED is solid GREEN, operation is normal, the MRS-485 knows the detector type, no errors are detected and no MODBUS
data are being received or transmitted over the RS-485 line.
2. When the LED is GREEN with random bursts of AMBER, operation is normal and now data are being received or transmitted over
the RS-485 line. The AMBER LED will come on anytime that there is data traffic.

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1 = 1
2 = 2
3 = 1, 2
4 =3
5 = 1, 3
6 = 2, 3
7 = 1, 2, 3
8 = 4
9 = 1, 4
10 = 2, 4
11 = 1, 2, 4
12 = 3, 4
13 = 1, 3, 4
14 = 2, 3, 4
15 = 1, 2, 3, 4
16 = 5
17 = 1, 5
18 = 2, 5
19 = 1, 2, 5
20 = 3, 5
21 = 1, 3, 5
22 = 2, 3, 5
23 = 1, 2, 3, 5
24 = 4, 5
25 = 1, 4, 5
26 = 2, 4, 5
27 = 1, 2, 4, 5
28 = 3, 4, 5
29 = 1, 3, 4, 5
30 = 2, 3, 4, 5
31 = 1, 2, 3, 4, 5
32 = 6
33 = 1, 6
34 = 2, 6
35 = 1, 2, 6
36 = 3, 6
37 = 1, 3, 6
38 = 2, 3, 6
39 = 1, 2, 3, 6
40 = 4, 6
41 = 1, 4, 6
42 = 2, 4, 6
43 = 1, 2, 4, 6
44 = 3, 4, 6,
45 = 1, 3, 4, 6
46 = 2, 3, 4, 6
47 = 1, 2, 3, 4, 6
48 = 5, 6
49 = 1, 5, 6
50 = 2, 5, 6
51 = 1, 2, 5, 6
52 = 3, 5, 6
53 = 1, 3, 5, 6
54 = 2, 3, 5, 6
55 = 1, 2, 3, 5, 6
56 = 4, 5, 6
57 = 1, 4, 5, 6
58 = 2, 4, 5, 6
59 = 1, 2, 4, 5, 6
60 = 3, 4, 5, 6
61 = 1, 3, 4, 5, 6
62 = 2, 3, 4, 5, 6
63 = 1, 2, 3, 4, 5, 6
64 = 7
65 = 1, 7
66 = 2, 7
67 = 1, 2, 7
68 = 3, 7
69 = 1, 3, 7
70 = 2, 3, 7
71 = 1, 2, 3, 7
72 = 4, 7
73 = 1, 4, 7
74 = 2, 4, 7
75 = 1, 2, 4, 7
76 = 3, 4, 7
77 = 1, 3, 4, 7
78 = 2, 3, 4, 7
79 = 1, 3, 4, 7
80 = 5, 7
83 = 1, 2, 5, 7
84 = 3, 5, 7
85 = 1, 3, 5, 7
86 = 2, 3, 5, 7
87 = 1, 2, 3, 5, 7
88 = 4, 5, 7
89 = 1, 4, 5, 7
90 = 2, 4, 5, 7
91 = 1, 2, 4, 5, 7
92 = 3, 4, 5, 7
93 = 1, 3, 4, 5, 7
94 = 2, 3, 4, 5, 7
95 = 1, 2, 3, 4, 5, 7
96 = 6, 7
97 = 1, 6, 7
98 = 2, 6, 7
99 = 1, 2, 6, 7
100 = 3, 6, 7
101 = 1, 3, 6, 7
102 = 2, 3, 6, 7
103 = 1, 2, 3, 6, 7
104 = 4, 6, 7
105 = 1, 4, 6, 7
106 = 2, 4, 6, 7
107 = 1, 2, 4, 6, 7
108 = 3, 4, 6, 7
109 = 1, 3, 4, 6, 7
110 = 2, 3, 4, 6, 7
111 = 1, 2, 3, 4, 6, 7
112 = 5, 6, 7
113 = 1, 5, 6, 7
114 = 2, 5, 6, 7
115 = 1, 2, 5, 6, 7
116 = 3, 5, 6, 7
117 = 1, 3, 5, 6, 7
118 = 2, 3, 5, 6, 7
119 = 1, 2, 3, 5, 6, 7
120 = 4, 5, 6, 7
121 = 1, 4, 5, 6, 7
122 = 2, 4, 5, 6, 7
123 = 1, 2, 4, 5, 6, 7
124 = 3, 4, 5, 6, 7
125 = 1, 3, 4, 5, 6, 7
126 = 2, 3, 4, 5, 6, 7
127 = 1, 2, 3, 4, 5, 6, 7
128 = 8
129 = 1, 8
130 = 2, 8
131 = 1, 2, 8
132 = 3, 8
133 = 1, 3, 8
134 = 2, 3, 8
135 = 1, 2, 3, 8
136 = 4, 8
137 = 1, 4, 8
138 = 2, 4, 8
139 = 1, 2, 4, 8
140 = 3, 4, 8
141 = 1, 3, 4, 8
142 = 2, 3, 4, 8
143 = 1, 2, 3, 4, 8
144 = 5, 8
145 = 1, 5, 8
146 = 2, 5, 8
147 = 1, 2, 5, 8
148 = 3, 5, 8
149 = 1, 3, 5, 8
150 = 2, 3, 5, 8
151 = 1, 2, 3, 5, 8
152 = 4, 5, 8
153 = 1, 4, 5, 8
154 = 2, 4, 5, 8
155 = 1, 2, 4, 5, 8
156 = 3, 4, 5, 8
157 = 1, 3, 4, 5, 8
158 = 2, 3, 4, 5, 8
159 = 1, 2, 3, 4, 5, 8
160 = 6, 8
161 = 1, 6, 8
162 = 2, 6, 8
163 = 1, 2, 6, 8
164 = 3, 6, 8
165 = 1, 3, 6, 8
166 = 2, 3, 6, 8
167 = 1, 2, 3, 6, 8
168 = 4, 6, 8
169 = 1, 4, 6, 8
170 = 2, 4, 6, 8
171 = 1, 2, 4, 6, 8
172 = 3, 4, 6, 8
173 = 1, 3, 4, 6, 8
174 = 2, 3, 4, 6, 8
175 = 1, 2, 3, 4, 6, 8
176 = 5, 6, 8
177 = 1, 5, 6, 8
178 = 2, 5, 6, 8
179 = 1, 2, 5, 6, 8
180 = 3, 5, 6, 8
181 = 1, 3, 5, 6, 8
182 = 2, 3, 5, 6, 8
183 = 1, 2, 3, 5, 6, 8
184 = 4, 5, 6, 8
185 = 1, 4, 5, 6, 8
186 = 2, 4, 5, 6, 8
187 = 1, 2, 4, 5, 6, 8
188 = 3, 4, 5, 6, 8
189 = 1, 3, 4, 5, 6, 8
190 = 2, 3, 4, 5, 6, 8
191 = 1, 2, 3, 4, 5, 6, 8
192 = 7, 8
193 = 1, 7, 8,
194 = 2, 7, 8,
195 = 1, 2, 7, 8
196 = 3, 7, 8
197 = 1, 3, 7, 8
198 = 2, 3, 7, 8
199 = 1, 2, 3, 7, 8
200 = 4, 7, 8,
201 = 1, 4, 7, 8
202 = 2, 4, 7, 8
203 = 1, 2, 4, 7, 8
204 = 3, 4, 7, 8
205 = 1, 3, 4, 7, 8
206 = 2, 3, 4, 7, 8
207 = 1, 2, 3, 4, 7, 8
208 = 5, 7, 8
209 = 1, 5, 7, 8
210 = 2, 5, 7, 8
211 = 1, 2, 5, 7, 8
212 = 3, 5, 7, 8
213 = 1, 3, 5, 7, 8
214 = 2, 3, 5, 7, 8
215 = 1, 2, 3, 5, 7, 8
216 = 4, 5, 7, 8
217 = 1, 4, 5, 7, 8
218 = 2, 4, 5, 7, 8
219 = 1, 2, 4, 5, 7, 8
220 = 3, 4, 5, 7, 8
221 = 1, 3, 4, 5, 7, 8
222 = 2, 3, 4, 5, 7, 8
223 = 1, 2, 3, 4, 5, 7, 8
224 = 6, 7, 8
225 = 1, 6, 7, 8
226 = 2, 6, 7, 8
227 = 1, 2, 6, 7, 8
228 = 3, 6, 7, 8
229 = 1, 3, 6, 7, 8
230 = 2, 3, 6, 7, 8
231 = 1, 2, 3, 6, 7, 8
232 = 4, 6, 7, 8
233 = 1, 4, 6, 7, 8
234 = 2, 4, 6, 7, 8
235 = 1, 2, 4, 6, 7, 8
236 = 3, 4, 6, 7, 8
237 = 1, 3, 4, 6, 7, 8
238 = 2, 3, 4, 6, 7, 8
239 = 1, 2, 3, 4, 6, 7, 8
240 = 5, 6, 7, 8
241 = 1, 5, 6, 7, 8
242 = 2, 5, 6, 7, 8
243 = 1, 2, 5, 6, 7, 8
244 = 3, 5, 6, 7, 8
245 = 1, 3, 5, 6, 7, 8
246 = 2, 3, 5, 6, 7, 8
247 = 1, 2, 3, 5, 6, 7, 8
254 = 2, 3, 4, 5, 6, 7, 8

3Operation
3.1 Initial Operating Mode
When power is first applied to the DVP-120, a few simple self-tests will be performed, and the system will cycle through all status lights,
and display the system name and model # (Figure 3-1). The system will then proceed to normal mode, if the operating parameters
have been entered.
D V P - 1 2 0 V e r 1 . 0 7
Figure 3-1 Model Display
! WARNING
Each time the unit is turned on it performs a self-test, which activates the audible and visual alarms. If the self-test fails, or all the alarms do not
activate, do not use. Failure to do so may adversely affect product performance and result in sickness or death.
If the user has not entered any parameters, the system WILL NOT be controlling the ventilation system. The relays WILL NOT actuate
and the horn and strobe outputs WILL NOT be powered. The power status light will show NORMAL (steady green) and the system will
immediately enter the CONFIGURATION mode, see section 3.2 for details to set the configuration parameters.
If a valid set of configuration parameters have been entered, the panel will wait for all sensors to warm up. During this time, the display
will show a count-down, minutes and seconds, until the end of the warm-up period, (Figure 3-2).
D V P - 1 2 0 V e r . 1 . 0 7
W a r m - u p 2 : 3 0
Figure 3-2 Warm-Up display
During the warm-up period, the keypad will be locked. When the warm-up period ends, the LCD will start showing the normal display.
3.1.1 Status Light Display
The POWER, ALARM/WARNING, SILENCE, RELAY 1, RELAY 2 and RELAY 3 status lights indicate the system status and provide
the following data:
POWER
Green (steady) – Power is good and there are no trouble indications
Yellow (steady) – Trouble is indicated by a transducer or the panel itself
ALARM/WARNING
Off – All indicated gas levels are below the warning level
Red (steady) – One or more gas levels is at or above the alarm level
Amber (steady) – One or more gas levels is at or above the warning level
HUSH
Off –There are no silenced alarms or warnings
Red (flashing) –There are alarms, warnings and/or troubles that have been silenced (gas levels may or may not
remain or continue to be at alarm or warning levels)
RELAY 1
Off – Relay 1 is not on
Green (steady) – Relay 1 is on

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RELAY 2
Off – Relay 2 is not on
Green (steady) – Relay 2 is on
RELAY 3
Off – Relay 3 is not on
Green (steady) – Relay 3 is on
The overall system status is visible at a distance via the status lights as described above. More detailed system information is
displayed on the LCD, which can show the status of each relay and sensor. A typical status display is shown in Figure 3-4.
3.1.2 User Interface
The LCD display is used to show detailed information about the status of the control system and the configuration parameters to the
user. The keypad is used to select the information displayed and to enter the configuration parameters, which are stored in the DVP-
120 memory. The keypad consists of the usual ten digit keys, four direction keys, plus a MENU key that is used to access the
configuration menu and a HUSH key that will silence the audible alarm indicators. In normal mode, holding the zero key for three (3)
seconds can be used to lock the keypad against accidental (or unauthorized) use. See Section 4.5 for details.
Figure 3-3 Keypad layout
Cursor Keys
In normal mode, (no warnings or alarms indicated), the up and down cursor keys will scroll the display to any configured sensors’
status. In normal mode, the left and right cursor keys will scroll through the status of each of the relays. When the left (or right) key is
used to scroll to another relay, the display will remove the underlining under the sensor number and underline the relay number; this
indicates that the digit keys can be used to jump directly to a particular relay’s status. When the up or down key is again used the
display will switch back to the digit keys jumping to a particular sensor.
MENU Key
The MENU key has three functions. First, when the system is presenting the normal display, pressing the MENU key will cause the
system to shift to the Configuration Menu. The second function of the MENU key is to return to the next-higher menu level, e.g. from
the sensor configuration menu to the system menu, or from the system menu out to normal mode. If in the middle of entering a multi-
digit parameter, the MENU key also cancels any changes to the parameter. When the MENU key is used to return to normal mode, any
changed configuration parameters are saved in the DVP-120’s memory. The third function of the MENU key is to change the LCD
contrast by holding the MENU key for five (5) seconds, at which point the LCD will prompt for further activities, see sections 4.4 for
more detail.
HUSH Key
The HUSH key is only used to silence the audible indicators (internal buzzer and possible external Horn and Strobe devices). Pressing
and releasing the button will silence the internal buzzer. The HUSH button must be held for 3 seconds to silence the Horn and Strobe
devices.

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3.1.3 Normal Status Display
M O N 1 0 : 2 3 R 1 O F F
S 0 1 C O 5 P P M
Figure 3-4 Normal System Display
The display shows the day of the week and the time of day, in 24-hour format. It also shows the status of one of the relays, R1 in this
example, and the type and indicated gas concentration of one of the configured sensors, S01 is a CO sensor indicating 5 ppm in this
example.
Notice in Figure 3-4 that the digits 0 1 are underlined; this indicates that the digit keys can be used to jump directly to another sensor’s
status. When the first digit is pressed, the display will prompt for the second digit of the target sensor.
S h o w S e n s o r _ 1
Figure 3-5 Sensor prompt
In this example, the first digit entered was 1. Since the DVP-120 can handle 12 sensors, the first digit for a sensor number is either 0 or
1. The leading zero must be entered when selecting a sensor less than ten. When the second digit is entered, the normal display will
be restored; showing the type and value for the selected sensor.
As mentioned above, the left and right scroll keys will display the next or previous relay’s status. The display will also change the
underline to indicate that the digit keys (zero, one and two) can be used to jump directly to a particular relay. Since only one digit is
needed to select a relay, the system does it immediately rather than prompting to show the relay.
If the sensor is indicating a gas level that is greater than the alarm or warning levels, the gas reading will alternate with the words
ALARM or WARNING as appropriate. If a sensor fails, a connection is lost or the panel itself detects a failure of its own, the panel will
enter TROUBLE mode and the gas reading will be replaced by the word TROUBLE (the TROUBLE status condition is discussed in
section 3.1.6 below).
3.1.4 ALARM Status Display
When any sensor indicates a gas level that is at or above the configured alarm level for the sensor, the panel will enter ALARM mode,
during which the internal buzzer will sound, the alarm lamp will be red and the LCD will show the sensor type and channel number.
A L A R M
C O S E N S O R 0 2
Figure 3-6 Alarm display
The display will cycle through all sensors that are signaling alarm levels, at five seconds per display. Pressing any key (except HUSH)
will advance the display to the next sensor that is signaling an alarm level.
! WARNING
Do not cover or obstruct audible alarm opening or visual alarm LED. Doing so may adversely affect product performance and result in sickness or
death.
If an external horn and/or strobe are connected and configured to signal an alarm condition, they will also sound when an alarm
condition occurs, after a delay if that configuration option is used.
When the HUSH key is pressed, the internal buzzer will be silenced for five (5) 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.

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When all indicators have been silenced, the display will show that alarms have been silenced for five minutes. After any key is pressed
(or five seconds), the display will return to normal mode.
A L A R M S I L E N C E D
F O R 5 M I N U T E S
Figure 3-7 Alarm Silenced message
If Relay 1 is configured as an ALARM relay, it will be turned on when an alarm condition is recognized and will be turned off when all
audio indicators have been silenced using the HUSH key.
3.1.5 Warning Status Display
When any sensor indicates a gas level that is at or above the configured warning level for the sensor, the panel will enter WARNING
mode during which the internal buzzer will sound, the alarm/warning lamp will be amber and the LCD will show the sensor type and
channel number.
W A R N I N G
C O S E N S O R 0 2
Figure 3-8 Warning display
The display will cycle through all sensors that are signaling warning levels, at five seconds per display. Pressing any key (except
HUSH) will advance the display to the next sensor that is signaling a warning level.
If the buzzer and/or an external horn and/or external strobe are connected and configured to signal a warning condition, they will also
sound when a warning condition occurs. There is a configurable delay before the horn or strobe will sound, see sections 3.3.5.2 and
3.3.6.2.
When the HUSH key is pressed, the internal buzzer will be silenced for fifteen (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 warnings have been silenced for fifteen minutes. After any key is
pressed (or five seconds) the display will return to normal mode.
W A R N I N G S I L E N C E D
F O R 1 5 M I N U T E S
Figure 3-9 Warning Silenced message
3.1.6 Trouble Status Display
If a sensor fails, a connection is lost or the panel itself detects a failure of its own, the panel will enter TROUBLE mode during which the
internal buzzer will sound, the power lamp will be yellow and the LCD will display the specific sensor identified.
Possible trouble conditions are:
–Any configured channel has less than 4 mA flowing in the current loop
–A sensor is reporting a trouble condition
–Any configured channel wiring is open.
–Internal controller board problems are detected.
T r o u b l e
C O S e n s o r 0 2

19
Figure 3-10 Trouble display
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.
T R O U B L E S I L E N C E D
F O R 8 H O U R S
Figure 3-11 Trouble Silenced message
3.2 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).
3.2.1 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.
Z O N E S I G N A L
Z O N E 1
Figure 3-12 Zone Signal display
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.
Z O N E S I L E N C E D
F O R 1 5 M I N U T E S
Figure 3-13 Zone Signal Silenced message
3.3 Setting the System Configuration
The configuration menus can be entered from normal mode by pressing the MENU key. While in configuration mode, the user can
review all configuration parameters to check the current operating conditions. As an aid when configuring the control panel, the first

20
entry in the top menu summarizes the number of sensors and relays that the panel is currently recognizing. Be sure that the 4-20mA
output on each sensor is set to “On”.
5 S E N S O R S F O U N D
3 R E L A Y S F O U N D
Figure 3-14 Hardware Summary
The MENU key is also used to return to a higher-level menu and finally exit the configuration menus back to normal mode. When
exiting from the menu system to normal mode, if any configuration changes have been made, the panel will ask whether changes are
to be saved.
S a v e C o n f i g . ?
( 0 = N O , 1 = Y E S )
Figure 3-15 Save Configuration? Prompt
Pressing the zero (0) key at this point will cancel all changes except time and day of week. Pressing the one (1) will save all changes to
memory, and the changes will then become effective in controlling the ventilation system.
While the DVP-120 is in the configuration mode, alarm and ventilation control functions continue in the background with the previously
set configuration values. In particular, if an alarm condition is detected, the alarm lamp, the buzzer, the horn and the strobe will operate
as configured but the LCD will not display the detailed information. The HUSH key can be used to silence any alarm, warning or trouble
indicators without having to exit the configuration mode. If the MENU key is used to exit the configuration mode before using the HUSH
key, the LCD will display the cause of the audible indicator.
The numeric keys are used to change the particular parameter displayed. The underlined character, or space, on each display
indicates what will be changed by the digit keys.
The left and right cursor keys will enter the particular submenu and scroll through the items of the same type where appropriate, e.g.
enter the Configure Sensors submenu and scroll through the parameter lists for the existing sensors.
The up cursor key scrolls through the menu entries in the order listed here, while the down cursor key scrolls in the reverse order.
Changing the configuration parameters requires the entry of a password before changes can be made. The default password is 1234.
See Figure 3-21 for an example of the password prompt.
In many cases the parameter is entered as a string of digits, but some parameters are selected by pressing a single key, e.g. pressing
1 selects Monday, 2 selects Tuesday, etc.
3.3.1 System Menu
The top menu level allows the user to select:
–Configure System
–Configure Sensors
–Configure Relays, Horn & Strobe
–Configure Zones
–Configure Signals
The up and down cursor keys can be used to scroll through the entries in the list, while the left or right key will enter the particular
submenu.
The MENU key will return to normal mode. If any configuration parameters have been changed, the panel will prompt to save the
changes. If the changes are saved, this is the point at which they become effective in controlling the ventilation system and for alarm
level detection. Note that changes to the time and day of week are not considered configuration items; they are saved as soon as they
are entered.