Toxalert GVU-3 User Manual

TM

TOXALERT

DATA

SHEET

CO, CO2, NO2, AND/OR VOC MONITOR

MODEL GVU-3

VEHICLE EXHAUST GAS DETECTOR

GENERAL DESCRIPTION:

The GVU-3 ventilation control system combines toxic gas-based and time-based fan control modes in an all solid-state, low
maintenance, cost effective product.

The GVU-3 series controller can monitor up to three (3) GVU-CO sensors; (3) GVU-CO2 sensors, (3) GVU-NO2 sensors, (3)
GVU-VOC sensors; or any combination of sensors. The GVU-3 Controller consists of the power supply, solid state clocks, time
delays, output relays, terminal strips, 3 sensor alarm LED’s and a green LED to indicate power to remote sensors.

The GVU-CO sensor is microprocessor based and is temperature and humidity compensated for stability. The GVU-CO sensor
range is 0 to 250 ppm. The transducer utilizes a tinoxide sensing element that is cleaned and sampled by the microprocessor. The
GVU-CO indicates its status via a two color LED (light emitting diode). When the LED is flashing green, operation is normal
and not in alarm. When the LED is flashing red, the unit is in alarm (high CO); a continuous red or green indicates sensor
failure; and LED extinguished indicates power failure.

See separate specification data sheet for information regarding GVU-CO2 carbon dioxide sensors, GVU-NO2 nitrogen dioxide
sensor and GVU-VOC smoke/air quality sensor.

TIME CONTROL:

The systems “hour” clock outputs to it’s “fan-on” relay once per hour causing it to
energize. The “on” time of the “fan-on” relay is user adjustable, in one minute
settings from 1 to 8 minutes. The “hour” clock operates in this manner irrespective
of gas concentration, and may be disabled, if desired. To disable “hour” clock
operation, place switch S3 to RST (RESET) position.

DETECTION CONTROL:

Should a high gas concentration occur (above user-adjustable alarm level), an alarm
signal from any sensor unit starts a 30 second delay. Should the concentration persist
through the delay period, the “alarm” clock is activated. The “on” time of this clock,
is user-adjustable in discrete settings from 1 to 8 minutes and its setting is indepen­dent of the “hour clock” setting. Upon activation of the “alarm” clock, the “fan-on”
relay energizes and remains energized until the “alarm clock” times out. Should the
high concentration still be above the alarm level, the “fan-on” relay will remain ON
and the “warning” relay will energize. This condition is maintained until the high
concentration drops.

In the event of a power failure, the control unit sets itself to an alarm condition upon
power restoration. Thus, fan activation is assured, to clear possible accumulated

toxic gases.

CONTROL PANEL

FEATURES

• Fully electronic for long life

• User adjustable alarm setting

• User adjustable minimum fan run time

• User adjustable 2nd stage activation

• One person field calibration

• UL listed components

• Key locking sensor

OPTIONS

• Audible alarm with silence switch

• Power ON, Fan ON LED’s on face of controller

TOXALERT INTERNATIONAL, INC., P.O. BOX 159, MOUND, MINNESOTA 55364 [phone] FAX [phone]

Visit our website at www. toxalert. com

• Red LED to indicate high gas concentration for each sensor

• Visual indication of high gas concentration level and fan on

• Automatic fan start-up upon power restoration following power outage

• Operating range meets OSHA std. 1910.1000

• User adjustable clock-activation of fans, if desired

• NEMA 1 std., others available

• Sensor alarm LED’s on face of controller

• Controller key lock

SPECIFICATIONS

Input Power: 120 VAC, 60 Hz, 1A (fused)
Relay Contacts: 24 VAC, 2A resistive, 1.5 inductive
Discrete Clock Settings: 1 minute intervals
Automatic Ventilation Cycle Upon

Power Restoration: User adjustable 1 to 8 minutes
Finish: Control Unit: Gray enamel
Enclosure: Nema 1 standard, others available
Dimensions: 14” H x 12” W x 4” D.

(305mm x 102 mm)

Weight: 8 lbs. (3.6 kg)

INSTALLATION INSTRUCTIONS

1. INTRODUCTION

Your TOXALERT Ventilation Control System incorporates the
latest in solid state technology to give you maximum reliability
and perfomance. The system alarm set point can be adjusted to
activate fans upon detection of an unsafe concentration of CO,
CO

, NO2,VOC air quality. In addition, a user-definable hourly

2

repeat cycle is provided, allowing time-based, as well as gas­based fan activation. In both modes of fan control, the “on”
time is user-adjustable 1 to 8 minutes in one minute increments.
For optimum performance, install, burn-in, calibrate and check
out your TOXALERT exactly as instructed. If your
TOXALERT can’t be calibrated or fails checkout, please
contact your local representative or TOXALERT
International for servicing.

2. INSTALLATION

Refer to figures 1, 2 and 3, and install and connect the
TOXALERT sensors and control units as follows:

GVU-CO SENSING UNITS

1) Open the door using the key provided. Next lift off the front

door by sliding it up the pins of the hinges. Put it aside.

2) Locate a mounting location away from drafts, away from

direct fresh air intakes, and mount vertically on wall or

support column approximately 5 to 6 feet above floor.

3) Mount base with hinge pins along left side by using

mounting holes (4 are available).

4) A wiring access hole must be added to the base anywhere

around the bottom or right side. Do not place an access hole

on the hinge side of the base, since, if conduit is used, this

may restrict the opening of the door. If conduit is to be used,

use a chassis punch to match the required fitting size.

5) Remove any metal chips and burrs from enclosure.

6) Place the cover onto the hinges of the base.
See separate data sheet for installation instructions of

GVU-CO2, GVU-NO2 and GVU-VOC.

TOXALERT INTERNATIONAL, INC., P.O. BOX 159, MOUND, MINNESOTA 55364 [phone] FAX [phone]

Visit our website at www. toxalert. com