Macurco CD Series User manual

IMPORTANT: Keep these user instructions for reference.
Macurco™ CD-6H/CD-6MC/CD-12H/CD-12MC
Carbon Dioxide Detector, Controller and Transducer
User Instructions

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Table of Contents
1General Safety Information........................................................................................................................................................4
1.1 List of warnings .................................................................................................................................................................4
2Use Instructions and Limitations................................................................................................................................................5
2.1 Use For ..............................................................................................................................................................................5
2.2 Do NOT use for ..................................................................................................................................................................6
2.3 Features.............................................................................................................................................................................6
2.4 Specifications ....................................................................................................................................................................6
2.4.1 6-Series Low Voltage.....................................................................................................................................................7
2.4.2 12-Series Line Voltage...................................................................................................................................................7
3Installation Instructions .............................................................................................................................................................7
3.1 Location.............................................................................................................................................................................7
3.2 Installation.........................................................................................................................................................................7
3.2.1 6-Series Low Voltage.....................................................................................................................................................7
3.2.2 12-Series Line Voltage.................................................................................................................................................12
3.3 Wiring Connections .........................................................................................................................................................16
3.3.1 6-Series Low Voltage...................................................................................................................................................16
3.3.2 12-Series Line Voltage.................................................................................................................................................17
4Operations ...............................................................................................................................................................................18
4.1 Power up .........................................................................................................................................................................18
4.2 Display turned “On” ........................................................................................................................................................18
4.3 Display turned “Off”........................................................................................................................................................18
4.4 4-20mA Loop ...................................................................................................................................................................19
4.5 Default –Factory Settings ...............................................................................................................................................19
4.5.1 Selecting Default Configuration –“dEF” .....................................................................................................................20
4.5.2 Power-Up Test Setting –“PUt” ...................................................................................................................................20
4.5.3 Display Setting –“dSP” ...............................................................................................................................................20
4.5.4 Buzzer Setting –“bUZ”................................................................................................................................................20
4.5.5 Alarm Relay Setting –“ArS” ........................................................................................................................................21
4.5.6 Alarm Relay Configuration –“Arc”..............................................................................................................................21
4.5.7 Fan Relay Setting –“FrS”.............................................................................................................................................21
4.5.8 Fan Relay Delay Setting –“Frd” ..................................................................................................................................21
4.5.9 Fan Relay Minimum Runtime Setting –“Frr”..............................................................................................................21
4.5.10 Fan Relay Latching Setting –“FrL”..........................................................................................................................21
4.5.11 Trouble Fan Setting –“tFS” ....................................................................................................................................21
4.5.12 4-20mA Output setting –“420”..............................................................................................................................22
5Troubleshooting.......................................................................................................................................................................22

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5.1 On-Board Diagnostics......................................................................................................................................................22
5.1.1 4-20mA troubleshooting.............................................................................................................................................22
5.1.2 “t” Error Codes............................................................................................................................................................22
5.2 Sensor Poisons ................................................................................................................................................................23
5.3 End-of-Life Signal.............................................................................................................................................................23
6Maintenance ............................................................................................................................................................................23
6.1 Sensor Life Reset .............................................................................................................................................................24
6.2 Cleaning...........................................................................................................................................................................24
7Testing......................................................................................................................................................................................24
7.1.1 Operation Test ............................................................................................................................................................24
7.1.2 Manual Operation Test ...............................................................................................................................................25
7.2 Calibration and Test Kits..................................................................................................................................................25
7.2.1 Field Test Kit................................................................................................................................................................26
7.2.2 Field Calibration Kit.....................................................................................................................................................26
7.3 Gas Testing ......................................................................................................................................................................26
7.3.1 Testing the Fan Relay ..................................................................................................................................................26
7.3.2 Testing the Alarm Relay ..............................................................................................................................................27
7.3.3 Testing the 4-20mA loop.............................................................................................................................................28
7.3.4 Aerosol Test ................................................................................................................................................................28
7.4 Field Calibration Procedure.............................................................................................................................................28
7.4.1 CD-xxH.........................................................................................................................................................................28
7.4.2 CD-xxMC......................................................................................................................................................................28
8Appendix A –Table of Figures..................................................................................................................................................30
9Appendix B –Menu Structure..................................................................................................................................................31
9.1 Main Menu......................................................................................................................................................................31
9.2 Auto Test Menu “bUZ” ....................................................................................................................................................32
9.3 Configuration Menu “CON”.............................................................................................................................................33
9.4 Select Test Menu “tst” ....................................................................................................................................................39
9.5 CAL Menu *CD-xxMC Only ..............................................................................................................................................40
10 Macurco Gas Detection Product limited warranty ..................................................................................................................41
Technical Support Contact Information .........................................................................................................................................41
General Contact Information..........................................................................................................................................................41

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1General Safety Information
The following instructions are intended to serve as a general guideline for the use of the Macurco CD-6H, CD-6MC, CD-12H, and
CD-12MC Carbon Dioxide Detector. This manual will refer to these devices a CD-xx-H/MC unless content is specific to a model.
This manual is not to be considered all-inclusive, nor is it intended to replace the policy and procedures for your facility. If you
have any doubts about the applicability of the equipment to your situation, consult an industrial hygienist or call Technical
Support at 1-844-325-3050.
1.1 List of warnings
WARNING
Each person using this equipment must read and understand the information in this user manual before
use. Use of this equipment by untrained or unqualified persons or use that is not in accordance with this
user manual, may adversely affect product performance.
Use only for monitoring the gas which the sensor and monitor is designed to detect. Failure to do so may
result in exposures to gases not detectable and cause serious injury or death. For proper use, see
supervisor or user manual, or contact Technical Support at 1-844-325-3050.
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.
This detector helps monitor for the presence and concentration level of a certain specified airborne gas.
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 cause serious injury or death. For proper use, see
supervisor or User manual, or contact Technical Support at 1-844-325-3050.
High voltage terminals (120/240 VAC) are located within this detector, presenting a hazard to service
technicians. Only qualified technicians should open the detector case and service the internal circuits.
Ensure power is de-energized from the detector relays prior to servicing the unit. Failure to do so may
result in electrical shock.
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 impair product
performance.
Using a certified gas with a concentration other than the one listed for this detector when conducting a
calibration or calibration verification test (bump test) will produce inaccurate readings. This means that
higher levels of the gas being monitored may be present and could result in overexposure. For proper
use, see supervisor or User manual, or contact Technical Support at 1-844-325-3050.
The following steps must be performed when conducting a calibration or calibration verification test
(bump test) to ensure proper performance of the monitor. Failure to do so may adversely affect product
performance.
•When performing a calibration or calibration verification test (bump test), only use certified
calibration gas at the required concentration level.
•Do not test with expired calibration gas.
•Do not cover or obstruct display or visual alarm cover.
•Ensure sensor inlets are unobstructed and are free of debris
Failure to follow instructions outlined in this user manual can result in sickness or death.

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2Use Instructions and Limitations
The Macurco CD-xxH/MC a dual relay Carbon Dioxide (COP2P) detector, controller, and transducer available in low voltage and line
voltage options. The CD-xxH/MC has selectable 4-20 mA output, buzzer and digital display options. It is an electronic detection
system used to measure the concentration of Carbon Dioxide and provide feedback and automatic ventilation control to help
reduce COP2Pconcentrations in conference rooms, classrooms, meeting halls or similar applications. The CD-xxH/MC is a low-level
meter capable of displaying from 0-5000 ppm (parts per million) of Carbon Dioxide. The CD-xxH/MC is factory calibrated and
100% tested for proper operation.
The CD-xxH uses an automated background calibration program to set the clean air level on a regular basis.
The CD-xxMC has the same setting and features of the CD-xxH with the addition of being able to perform a manual calibration.
The CD-xxMC requires a manual calibration process at a minimum of once per year using the Macurco CD6-FCK calibration kit.
WARNING
Each person using this equipment must read and understand the information in this user manual
before use. Use of this equipment by untrained or unqualified persons or use that is not in
accordance with this user manual, may adversely affect product performance.
2.1 Use For
The CD-xxH/MC provides COP2Pdetection 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 COP2Pas 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 COP2Plevel 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. COP2Pconcentrations
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 COP2Plevels 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 COP2Ptanks, 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-xxH uses an automated background calibration program to set the clean air level on a regular basis. The CD-xxH 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-xxMC 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.
42TNote:42T This applies when used in typical indoor ambient air. The CD-xxH/MC can be used stand alone, with the Macurco
Detection and Ventilation Control Panel, other 12 VAC or 24 VDC fire/security panels or building automation systems.
WARNING
Use only for monitoring the gas which the sensor and monitor is designed to detect. Failure to do
so may result in exposures to gases not detectable and cause serious injury or death. For proper
use, see supervisor or user manual, or contact Technical Support at 1-844-325-3050.

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2.2 Do NOT use for
The CD-xxH/MC is not intended for use in hazardous locations or industrial applications such as refineries, chemical plants, etc.
Do not mount the CD-xxH/MC where the normal ambient temperature is below 32°F or exceeds 122°F (0°C or above 50°C). The
CD-xxH/MC mounts on a type 4S electrical box supplied by the contractor. Do not install the CD-xxH/MC 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.
2.3 Features
•ETL LISTED to UL 61010-1, Certified to CSA C22.2#61010-1
•Low level meter capable of displaying from 0-5000 ppm of COP2
•Sensor Resolution of 50 ppm
•The CD-xxH uses an automated background calibration program to set the clean air level on a regular basis *
•The CD-xxMC uses a manual Calibration to set clean and polluted air levels using a Calibration Kit **
•Selectable fan and alarm relay activation
•5 A SPDT fan relay for control of ventilation systems / communication with Alarm system
•0.5 A N.O. or N.C. alarm relay connects to warning devices or control panels
•4-20 mA Current Loop
•Mounts on a standard 4x4 electrical box and becomes cover for the box
•Supervised system: any internal detector problem will cause the fan & alarm relay to activate
•Carbon Dioxide sensor has an expected 15-year life. EOL indicator after 180 months of sensor power-up
•Calibration verification test kit is available. One screw allows access for gas test
*CD-xxH Only
**CD-xxMC Only
2.4 Specifications
•Shipping Weight: 1 pound (0.45 kg)
•Size: 4 1/2 x 4 x 2 1/8 in. (11.4 X 11.4 X 5.3 cm)
•Color: White or Dark Gray
•Connections: plugs/terminals
•Mounting box: (not included) 4x4 electric
•Fan relay: 5 A, 240 VAC, pilot duty, SPDT, latching or non-latching
•Fan relay actuation: selectable at dIS (disabled), 600, 700, 800, 900, 1000 (default)…, 4800, 4900, 5000 ppm
•Fan Delay Settings of 0, 1, 3 (default), 5 and 10 minutes
•Fan Relay Minimum Runtime settings are 0 (default), 3, 5, 10 or 15 minutes
•Fan relay latching or non-latching (default) selectable
•Alarm relay: 0.5A 120 V, 60 VA
•Alarm relay actuation: selectable N.O. (default) or N.C.
•Alarm relay settings: “dIS” (disabled), 900, 1000, 1100, 1200, …4000(default), ….4900, 5000
•Current Loop, 4-20 mA for 0-5000 ppm COP2P, selectable to off or on (default)
•Buzzer: 85 dBA at 10cm settable to off or on (default)
•Digital display: 4-digit LED selectable to off or on (default).
•Operating Environment: 32°F to 122° F (0°C to 50°C), 10 to 90% RH non-condensing
•Operating altitude: Up to 16,404ft (5,000m)

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2.4.1 6-Series Low Voltage
•Power: 3 W (max) from 12 to 24 VAC or 12 to 32 VDC
•Current (max) @ 24 VDC: 126 mA in alarm (two relays), 108 mA (fan relay only) and 85 mA (standby)
2.4.2 12-Series Line Voltage
•Power: 100-240VAC (50-60 HZ)
•Current (Max) 1.0 A MAX
3Installation Instructions
WARNING
This detector helps monitor for the presence and concentration level of a certain specified
airborne gas. 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 cause serious injury or
death. For proper use, see supervisor or User manual, or contact Technical Support at 1-844-325-
3050.
3.1 Location
Mounting height will be dependent on the application. For applications with COP2Ptanks, mount height should be about one foot
above the floor. For indoor air quality mount detector at breathing level, about 5 feet (1.5 meters) above the floor on a wall or
column in a central area where air movement is generally good. The unit, on average, can cover between 900 sq. ft. (83.62 sq.
meters) and 5000 sq. ft. (464.51 sq. meters) depending on the application. Applications with CO2tanks, spacing near the tanks
should be closer to the 900 sq. ft. For indoor air quality and purposefully enriched areas, such as greenhouses, spacing can be up
to 5000 sq. ft. When determining the coverage area for each application, keep in mind that each application is going to be
different and needs to be evaluated to determine the number of detectors required to ensure proper coverage. Some of the
factors that affect the coverage area are application type, personnel work areas and movement, room size, air movement,
potential threat, mounting location, along with other site-specific factors that must be considered. Please check local
regulations or requirements prior to installation.
The CD-xxH/MC mounts on a 4x4 electrical box supplied by the contractor. Do not install the CD-xxH/MC inside another box
unless it has good air flow through it. DO NOT mount the CD-xxH/MC where the normal ambient temperature is below 32°F or
exceeds 122°F (below 0°C or above 50°C).
WARNING
High voltage terminals (120/240 VAC) are located within this detector, presenting a hazard to
service technicians. Only qualified technicians should open the detector case and service the
internal circuits. Ensure power is de-energized from the detector relays prior to servicing the unit.
Failure to do so may result in electrical shock.
3.2 Installation
3.2.1 6-Series Low Voltage
1. The CD-xxH/MC mounts on a 4” square (or 4x4) electrical box supplied by the contractor. DO NOT mount the CD-
xxH/MC inside another box, unless it has good air flow through it.

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2. Connect the CD-6H/MC to Class 2 power supply only. It is suggested to use a dedicated transformer for powering the
unit or units because of possible interferences from other devices on the same power supply.
3. Connect the CD-6H/MC to the control cables with terminal plugs. When making connections, make sure the power is
de-energized.
4. There are two terminals for Power: 12 to 24 VAC or 12 to 32 VDC, with no polarity preference.
5. There are two terminals for the dry alarm relay contacts, again with no polarity preference. The alarm relay can switch
up to 0.5 A 120 V, or 60 VA. The alarm relay is activated if gas reaches or exceeds the alarm settings. See section 31T U4.5
Default –Factory SettingsU31T of this User manual for details on relay settings.
6. The alarm relay can be configured to normally open (default) (N.O.) or normally closed (N.C.) and will activate if the gas
concentration exceeds alarm set point. It will deactivate once the gas concentration drops below the alarm set point.
Note that the “disable” setting will cause the alarm relay not to engage at all.
7. The dry contact, SPDT fan relay has three terminals. The common (COM.), normally open (N.O.) and the normally
closed (N.C.) contact. The fan relay can switch up to 5.0 A up to 240 VAC. See section 31T4.5 Default –Factory Settings31T of
these User Instructions for details on relay settings.
8. The Fan Relay can be configured for latching or non-latching (default) when activated (when the gas concentration
exceeds fan relay setpoint). Once latched in, power will need to be interrupted or the “TEST” button pressed to un-
latch the relay condition.
9. The Fan Relay will engage if the fan setting Carbon Dioxide concentration is exceeded for longer than the Fan Relay
Delay time. Unless it is configured for latching, the fan relay will disengage once both conditions have been met:
•Carbon Dioxide concentration has dropped below fan setting
•Fan Relay Runtime has been exceeded
Note that the “disable” fan setting will cause the fan relay to not engage. The fan relay will engage in trouble fault
condition (if the Trouble Fan Setting Option is set to “ON”) and will disengage once trouble fault condition is cleared.
10. The Current Loop is 4 mA in clean air and 4-20 mA for 0-5000 ppm COP2
Figure 3-1 6-Series 4-20 mA Output diagram

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Figure 3-2 6-Series Rear View
Figure 3-3 6-Series typical installation diagram

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Figure 3-4 6-Series Multiple Device diagram
Figure 3-5 6-Series Alarm Control Panel diagram

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Figure 3-6 6-Series DVP-120 Control Panel
Figure 3-7 6-Series Alternate Alarm Panel

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Figure 3-8 6-Series Horn & Strobe Combo Wiring
3.2.2 12-Series Line Voltage
1. The CD-12H/MC mounts on a 4” square (or 4x4) electrical box supplied by the contractor. Do not mount the CD-
12H/MC inside another box, unless it has good air flow through it.
2. Connect the CD-12H/MC to the control cables with terminal plugs. When making connections, make sure the power is
de-energized.
3. There are two terminals for Power: 100-240VAC (50 –60 HZ)
4. There are two terminals for the dry alarm relay contacts, again with no polarity preference. The alarm relay can switch
up to 0.5 A 120 V, or 60 VA. The alarm relay is activated if gas reaches or exceeds the alarm settings. See section 31T 4.5
Default –Factory Settings31T of these User Instructions for details on relay settings.
5. The alarm relay can be configured to normally open (default) (N.O.) or normally closed (N.C.) and will activate if the gas
concentration exceeds alarm set point. It will deactivate once the gas concentration drops below the alarm set point.
Note that the “disable” setting will cause the alarm relay not to engage at all.
6. The dry contact, SPDT fan relay has three terminals. The common (COM.), normally open (N.O.) and the normally
closed (N.C.) contact. The fan relay can switch up to 5.0 A up to 240 VAC. See section 31T4.5 Default –Factory Settings31T of
these User Instructions for details on relay settings.
7. The Fan Relay can be configured for latching or non-latching (default) when activated (when the gas concentration
exceeds fan relay setpoint). Once latched in, power will need to be interrupted or the “TEST” button pressed to un-
latch the relay condition.
8. The Fan Relay will engage if the fan setting Carbon Dioxide concentration is exceeded for longer than the Fan Relay
Delay time. Unless it is configured for latching, the fan relay will disengage once both conditions have been met:
•Carbon Dioxide concentration has dropped below fan setting
•Fan Relay Runtime has been exceeded
Note that the “disable” fan setting will cause the fan relay to not engage. The fan relay will engage in trouble fault
condition (if the Trouble Fan Setting Option is set to “ON”) and will disengage once trouble fault condition is cleared.
9. The Current Loop is 4 mA in clean air and 4-20 mA for 0-5000 ppm COP2

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Figure 3-9 12-Series 4-20 mA Output diagram
Figure 3-10 12-Series Rear View

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Figure 3-11 12-Series Alarm Control Panel
Figure 3-12 12 Series Alarm Control Panel diagram

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Figure 3-13 12-Series DVP-120 Control Panel
Figure 3-14 12-Series Alternate Alarm Panel
In this application (31TFigure 3-14 12-Series Alternate Alarm Panel31T) the Fan or primary relay is used as a low-level alarm relay. The
Alarm or secondary relay is used as a supervisory relay when utilized in the normally closed configuration. The CD-xxH/MC
monitors all critical functions of the unit through software diagnostics that continually test and verify its operations. If a
problem is found, the unit will switch to a fail-safe/error mode or trouble condition. In this error mode, the Fan* and Alarm
relays will be activated indicating the trouble condition at the panel and the CD-xxH/MC display will flash the error. See section
31T4.5.11 Trouble Fan Setting –“tFS”31T for options.

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Figure 3-15 12-Series Horn & Strobe Combo Wiring
3.3 Wiring Connections
3.3.1 6-Series Low Voltage
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 back side of the detector.
NOTE: 22 to 12 AWG wire shall be used. Wire used shall meet the temperature range of the detector i.e. 0°F to 125° F (-18°C to
52°C).
3.3.1.1 Power Connection
Connect the CD-6H/MC to Class 2 power supply only. It is suggested to use a separate transformer for powering the unit or units
because of possible interferences from other devices on the same power supply. Connect the CD-6H/MC to the control cables
with terminal plugs. When making connections, make sure the power is off. There are two terminals for Power: 12 to 24 VAC or
12 to 32 VDC, with no polarity preference ensure that the wire cannot be easily pulled from the connector. Plug the modular
connection into the Fan/Power connection and ensure that it latches into the header properly.
3.3.1.2 Fan Relay Connection
All the SPDT Fan relay terminals are available at the Fan/Power modular connector. Each fan relay terminal normally open,
common and normally closed (NO, COM, and NC) can accommodate a wire size 12 to 24 AWG. To install the wiring for the
relays, disconnect the connectors from the header. Strip the insulation off each wire back approximately ¼ inch (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.
Plug the modular connection into the Fan/Power connection and ensure that it latches into the header properly.
3.3.1.3 Alarm Relay Connection
The external alarm connections (A and B) are available at the Alarm modular connector. There is no polarity for these
connections. To install the wiring for the alarm contacts, disconnect the connector from the header on the detector. 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. When the wires are connected seat the modular connector
into the header ensuring that the latch engages.
3.3.1.4 4-20 mA Output diagram
The positive and negative 4-20mA signal connections (+ and -) are available at the 4-20mA modular connector, a 2-position
connector. To install the wiring for the 4-20 mA contacts, disconnect the connector from the header on the detector. 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.

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Ensure that the wire cannot easily be pulled from the connector. When the wires are connected seat the modular connector
into the header ensuring that the latch engages.
3.3.2 12-Series Line Voltage
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 back side of the detector.
3.3.2.1 Power Connection
Mains connections should be done in accordance with National and Local Electrical Codes. Only qualified personnel should
connect Mains power to any device. 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 screw of the metal electrical box. Tighten the screw and make sure the wire is snug. Ensure that the wire cannot
be pulled out from under the screw. The Line (L) and Neutral (N) wires should be stripped 1/4 in. (6.5 mm), insert the wire into
the ”L” and “N” wire positions of the modular Fan/Power connector and tighten the screw clamp. Ensure that the wire cannot
be easily pulled from the connector. Plug the modular connection into the Fan/Power connection and ensure that it latches into
the header properly.
3.3.2.2 Fan Relay Connection
All the SPDT Fan relay terminals are available at the Fan/Power modular connector. Each fan relay terminal normally open,
common and normally closed (NO, COM, and NC) can accommodate a wire size 12 to 24 AWG. To install the wiring for the
relays, disconnect the connectors from the header. Strip the insulation off each wire back approximately ¼ inch (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.
Plug the modular connection into the Fan/Power connection and ensure that it latches into the header properly.
3.3.2.3 Alarm Relay Connection
The external alarm connections (A and B) are available at the Alarm modular connector. There is no polarity for these
connections. To install the wiring for the alarm contacts, disconnect the connector from the header on the detector. Strip the
insulation off 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. When the wires are connected seat the modular connector
into the header ensuring that the latch engages.
3.3.2.4 4-20 mA Signal Connection
The positive and negative 4-20mA signal connections (+ and -) are available at the 4-20mA modular connector, a 2-position
connector. To install the wiring for the 4-20 mA contacts, disconnect the connector from the header on the detector. Strip the
insulation off 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. When the wires are connected seat the modular connector
into the header ensuring that the latch engages.
42TNote42T: The 4-20mA current loop outputs may be used with the Macurco DVP-120 control panel or other systems. The 4-20mA
signal connections to detectors should be size AWG18 (minimum) for short runs. Refer to the table for recommended wire
gauges. Do not bundle detector 4-20mA signal connections with AC power cables to prevent electrical interference. If AC power
connections must be bundled with the detector 4-20mA signal cables, the signal connections should be made with a twisted pair
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 DVP-120 panel.

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4Operations
1. With the display function turned “On”, the CD-xxH/MC will show the current concentration of COP2Pppm in the air.
Normal outdoor concentration ranges between 350-450 ppm. When the COP2Pconcentration reaches the Fan Relay
setting (2000 ppm, for example) the display will flash back and forth between “FAn” and “current gas reading”. With
the display function turned “Off”, the display does not show the COP2Pconcentration but will show “FAn” as long as the
fan relay is activated.
2. With the display function turned “On” and the COP2Pconcentration reaching the Alarm Relay setting, (4000 ppm, for
example) the display will flash back and forth between “ALr” and “current gas reading”. The buzzer will sound
indicating “Alarm” if the buzzer is turned “On”. With the display function turned off the display does not show the COP2P
concentration but will show “ALr” when the Alarm relay is activated.
3. With the 4-20 mA function turned “On” and the COP2Pconcentration climbing, the 4-20 mA signal will ramp up
corresponding to the concentration (0-5000 ppm, for example). The display will show “FAn” and “ALr” and sound as
outlined above.
4.1 Power up
The CD-xxH/MC cycles through an internal self-test cycle for the first minute that it is powered. The unit will execute the test
cycle any time power is dropped and reapplied (i.e. power failure). During the self-test cycle the unit will display the firmware
version number, then count down from 60 to 0 (if the display setting is “On”) and finally go into normal operation. The alarm
relay will be activated for 10 seconds and the fan relay for 60 seconds during the power-up cycle unless the “Power Up Test”
(PUt) option is OFF. The indicator light (LED) will flash green during the self-test cycle. At the end of the 1-minute cycle, the unit
will take its first sample of the air and the indicator light will turn solid green.
4.2 Display turned “On”
Clean Air –With the display function turned “On”, the CD-xxH/MC will show the current concentration of COP2Pppm.
Note: COP2Pin “clean air” will not show 0 as normal atmospheric COP2Plevels are between 350 ppm and 450 ppm.
Fan level –When the COP2Pconcentration reaches the Fan Relay setting (2000 ppm, for example) the display will flash back and
forth between “FAn” and “2000”(or current gas reading).
Alarm level –With the display function turned “On” and the COP2Pconcentration reaching the Alarm Relay setting, (4000 ppm, for
example) the display will flash back and forth between “ALr” and “current gas reading”. The buzzer will sound indicating “Alarm”
if the buzzer is turned “On”.
Trouble –With the display function turned “On” and the device is in a trouble state, the display will display the “t” Error code
(t01 for example). If the Trouble Fan Setting is enabled, the Fan relay will switch activating the relay. See section 31T5.1.2 “t” Error
Codes31T and section 31T4.5.11 Trouble Fan Setting –“tFS”.31T
4.3 Display turned “Off”
Clean Air –With the display function turned” Off”, the display does not show the COP2Pconcentration. Only the Power indicator
light on will be on.
Fan Level –When the CO concentration reaches the Fan Relay setting (2000 ppm, for example) the display will flash back and
forth between “FAn” and “blank” as long as the fan relay is enabled. This appears as slowly flashing “FAn”.
Alarm Level –With the display function turned off the display does not show the COP2Pconcentration but will show “ALr” when
the Alarm relay is activated.
Trouble –With the display function turned “On” and the device is in a trouble state, the display will display the “t” Error code
(t01 for example). If the Trouble Fan Setting is enabled, the Fan relay will switch activating the relay. See section 31T5.1.2 “t” Error
Codes31T and section 31T4.5.11 Trouble Fan Setting –“tFS”.31T

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4.4 4-20mA Loop
Clean Air –With the 4-20 mA function turned “On” and the current concentration of COP2Pppm, the 4-20mA loop will output a
mA reading equivalent to the current gas reading of the detector.
Fan Level –With the 4-20 mA function turned “On” and the current concentration of COP2Pppm detected is at or greater than the
Fan Relay Setting (Frs), the 4-20mA loop will output between 4 mA and 20 mA depending on the current concentration of COP2P.
See figure 31T3-1 4-20 mA Output diagram31T or figure 331T-9 12-Series 4-20 mA Output diagram31T
Alarm Level –With the 4-20 mA function turned “On” and the current concentration of COP2Pppm detected is at or greater than
the Alarm Relay Setting (Ars), the 4-20mA loop will output between 4 mA and 20 mA depending on the current concentration of
COP2P. See figure 31T3-1 4-20 mA Output diagram31T or 31Tfigure 3-9 12-Series 4-20 mA Output diagram31T
Trouble –With the 4-20 mA function turned “On” and Trouble Fan Setting enabled. The 4-20mA loop will output less than 4 mA
or greater than 20 mA depending on the Trouble condition. See section 31T5.1 On-Board Diagnostics31T.
4.5 Default –Factory Settings
Setting:
Default:
Power Up Test
On
Display
On
Buzzer
On
Alarm Relay Setting
4000 ppm
Alarm Relay Configuration
Normally Open (NO)
Fan Relay Setting
1000 ppm for CD-xxH
1000 ppm for CD-xxMC
Fan Relay Delay
3 minutes
Fan Relay Minimum Runtime
0 minutes
Fan Relay Latching
Off
Trouble Fan Setting
Off
4-20mA
On
Table 4-1 Default settings

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Figure 4-1 Board View
4.5.1 Selecting Default Configuration –“dEF”
To select the Default Configuration, in normal mode, push the Next button to get to “Con” or the Configuration menu. Then
push the Enter button to enter the Con menu. The first selection is the “dEF” or Default setting. Push Enter. If it is already in
Default configuration, there will be no action. If it is not already in Default configuration, “nO” will be displayed. Push Next to
change it to “YES” (flashing) then push Enter to confirm the change (solid) and push Enter again to return to “dEF” in the con
menu. Push Next until “End” is displayed then push Enter to get back to normal operation.
4.5.2 Power-Up Test Setting –“PUt”
To select the Power Up Test Configuration, in normal mode, push the Next button to get to “Con” or the Configuration menu.
Then push the Enter button to enter the Con menu. Then push the Next button to get to the second selection “PUt” or Power
Up Test setting. Push Enter. If the test is “On” push Next to turn it “OFF” (flashing) then push Enter to confirm the change (solid)
and push Enter again to return to “PUt” in the Con menu. Push Next until “End” is displayed then push Enter to get back to
normal operation.
4.5.3 Display Setting –“dSP”
To select the Display Configuration, in normal mode, push the Next button to get to “Con” or the Configuration menu. Then
push the Enter button to enter the Con menu. Then push the Next button to get to the third selection “dSP” or Display setting.
Push Enter. If the display is “On” push Next to turn it “OFF” (flashing) then push Enter to confirm the change (solid) and push
Enter again to return to “dSP” in the Con menu. Push Next until “End” is displayed then push Enter to get back to normal
operation.
4.5.4 Buzzer Setting –“bUZ”
To select the Buzzer Configuration, in normal mode, push the Next button to get to “Con” or the Configuration menu. Then push
the Enter button to enter the Con menu. The fourth selection is the “bUZ” or Buzzer setting. Push Next twice to get to “bUZ”
then Enter. If the display is “On” push Next to turn it “OFF” (flashing) then push Enter to confirm the change (solid) and push
Enter again to return to “bUZ” in the Con menu. Push Next until “End” is displayed then push Enter to get back to normal
operation.