Manual

4
2 USER INSTRUCTIONS AND LIMITATIONS
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.
2.1 Use For
The CD-12”x” provides CO
2
detection and automatic ventilation control for conference rooms, classrooms, meeting halls or similar
applications. Carbon dioxide is a colorless, odorless gas that is produced both by people exhaling CO
2
as well the burning of gasoline,
coal, oil, and wood. The outdoor concentration of carbon dioxide can vary from 350-450 parts per million (ppm) or higher in areas with
high vehicle traffic or industrial activity. The indoor CO
2
level depends upon the number of people present, how long an area has been
occupied, the amount of outdoor fresh air entering the area and other factors. CO
2
concentrations indoors can vary several hundred
parts per million in areas with many people present for an extended period and where fresh air ventilation is limited. Outdoor "fresh" air
ventilation is important as it can dilute CO
2
levels of the indoor environment. The amount of fresh air that should be supplied to a room
depends on the type of facility and room. Ventilation should keep carbon dioxide concentrations below 1000 ppm and create indoor air
quality conditions that are acceptable to most individuals.
For applications storing or using CO
2
tanks, the detector will provide notification in the event of a gas leak. Such applications include but
are not limited to food storage, beverage dispensing, agriculture, fire suppression, medical, etc.
The CD-12H uses an automated background calibration program to set the clean air level on a regular basis. The CD-12H will maintain
accuracy if it is exposed to the “clean air reference value” (this reference value is the lowest concentration to which the sensor is exposed)
at least once per week.
The CD-12MC does not perform automated background calibrations and it is suggested to perform a Manual Calibration on the unit no
less than once per year using the Macurco CD6-FCK calibration kit.
Note:
This applies when used in typical indoor ambient air. The CD-12”x” can be used as a standalone detector. For use with the Macurco Detection
and Ventilation Control Panel (DVP-120 only), and other fire/security panels or building automation systems. Line voltage is provided to the CD-12”x”
with the 4-20mA communication loop connected back to the panel.
WARNING
Use only for monitoring the gas which the sensor and instrument are designed to monitor. Failure to do so may result in exposures to gases
not detectable and cause sickness or death. For proper use, see supervisor or User Instructions, or call Technical Support at 844-325-3050.
2.2 Do Not Use For
The CD-12”x” is not intended for use in hazardous locations or industrial applications such as refineries, chemical plants, etc. Do not
mount
the CD-12”x” where the normal ambient temperature is below 32°F or exceeds 122°F (0°C or above 50°C). The CD-12”x” mounts on a
type 4S electrical box supplied by the contractor. Do not install the CD-12”x” inside another box unless it has good air flow through it.
WARNING
This equipment may not function effectively below 32°F or above 122°F (0°C or above 50°C). Using the detector outside of this temperature
range may adversely affect product performance and result in sickness or death.
2.3 General Description
The CD-12H is a line voltage, dual relay Carbon Dioxide (CO
2
) detector, and automatic ventilation controller. The CD-12”x” uses a
microcomputer controlled, electronic system to measure the concentration of CO
2
, actuate relays and provide a 4-20 mA output. The
CD-12”x” has a low maintenance long life (15+ years) non-dispersive infrared (NDIR) sensor and optional gas test/calibration kits. The
CD-12”x” is a low-level meter capable of displaying from 0-5000 ppm of carbon dioxide.