Macurco CD-6MC User manual

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

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Table of Contents
1 GENERAL SAFETY INFORMATION ........................................................................................................................................... 5
1.1 Intended Use ........................................................................................................................................................................ 5
1.2 List of Warnings and Cautions within these User Instructions .............................................................................................. 5
2 USER INSTRUCTIONS AND LIMITATIONS ............................................................................................................................... 6
2.1 Use For ................................................................................................................................................................................. 6
2.2 Do Not Use For ..................................................................................................................................................................... 6
2.3 General Description .............................................................................................................................................................. 6
2.4 Features ............................................................................................................................................................................... 7
2.5 Specifications........................................................................................................................................................................ 7
3 INSTALLATION AND OPERATING INSTRUCTIONS ................................................................................................................. 8
3.1 Location ................................................................................................................................................................................ 8
3.2 Installation............................................................................................................................................................................. 8
3.3 Power Up ............................................................................................................................................................................ 12
3.4 Operation ............................................................................................................................................................................ 12
3.5 Default Configuration – Factory Settings ............................................................................................................................ 13
3.5.1 Selecting Default Configuration – “dEF” .................................................................................................... 13
3.5.2 Selecting Power Up Test Option – “PUt” ................................................................................................... 14
3.5.3 Selecting Display Option – “dSP” .............................................................................................................. 14
3.5.4 Selecting Buzzer Option – “bUZ” .............................................................................................................. 14
3.5.5 Selecting Alarm Relay Setting – “ArS” ...................................................................................................... 14
3.5.6 Selecting Alarm Relay Configuration – “Arc” ............................................................................................. 14
3.5.7 Selecting Fan Relay Settings – “FrS” ........................................................................................................ 14
3.5.8 Selecting Fan Relay Delay – “Frd” ............................................................................................................ 14
3.5.9 Selecting Fan Relay Minimum Runtime – “Frr” ......................................................................................... 14
3.5.10 Selecting Fan Relay Latching Option – “FrL” ............................................................................................ 15
3.5.11 Selecting Trouble Fan Setting Option – “tFS” ........................................................................................... 15
3.5.12 Selecting 4-20mA Output Option – “420” .................................................................................................. 15
3.6 Onboard Diagnostics .......................................................................................................................................................... 15
3.6.1 The 4-20 mA signal can be used for troubleshooting: ............................................................................... 15
3.6.2 Error Codes ............................................................................................................................................... 15
4 Maintenance .............................................................................................................................................................................. 16
4.1 End-of-life Signal ................................................................................................................................................................ 16
4.2 Cleaning ............................................................................................................................................................................. 16
4.3 Testing ................................................................................................................................................................................ 16
4.3.1 General ..................................................................................................................................................... 16
4.3.2 Operation Test .......................................................................................................................................... 17
4.3.3 Manual Operation Test ............................................................................................................................. 17
4.3.4 Carbon Dioxide Gas Test .......................................................................................................................... 17
4.3.5 Field Calibration Kit – CD6-FCK ............................................................................................................... 18
4.3.6 FCK Information ........................................................................................................................................ 18
4.3.7 Gas Testing ............................................................................................................................................... 18
4.3.11 Manual Calibration – CD-6MC ONLY ....................................................................................................... 20
5 Appendix A – Menu Structure .................................................................................................................................................... 22
5.1 Main Menu .......................................................................................................................................................................... 22
5.2 Auto Test Menu “bUZ” ........................................................................................................................................................ 23
5.3 Configuration Menu “CON” ................................................................................................................................................. 24
5.4 Select Test Menu “tst” ......................................................................................................................................................... 30
5.5 CAL Menu * CD-6MC Only ................................................................................................................................................. 31
6 MACURCO PRODUCTS LIMITED WARRANTY ....................................................................................................................... 32
Technical Support Contact Information ............................................................................................................................................. 32
General Contact Information ............................................................................................................................................................. 32

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1 GENERAL SAFETY INFORMATION
1.1 Intended Use
The Macurco CD-6H and CD-6MC are low voltage, dual relay Carbon Dioxide (CO2) detector, controller and transducer. The CD-6”x”
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 CO2 concentrations in conference rooms,
classrooms, meeting halls or similar applications. The CD-6”x” is a low-level meter capable of displaying from 0-5000 ppm (parts per
million) of Carbon dioxide. The CD-6”x” is factory calibrated and 100% tested for proper operation.
The CD-6H uses an automated background calibration program to set the clean air level on a regular basis.
The CD-6MC has the same setting and features of the CD-6H with the addition of being able to perform a manual calibration. The CD-
6MC requires a manual calibration process at a minimum of once per year using the Macurco CD6-FCK calibration kit.
1.2 List of Warnings and Cautions within these User Instructions
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 serious injury or death.
 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 serious injury or death. For proper use, see supervisor or User Instructions,
or call Technical Support at 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 and result in serious injury or death.
 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 Instructions, or call Technical
Support at 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 serious injury 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 impair product performance and result in serious injury or death.
 Using a certified gas with a concentration other than the one listed for this detector when conducting a 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 and cause serious injury or death. For proper use, see supervisor or User Instructions, or
call Technical Support at 844-325-3050.
 The following steps must be performed when conducting a calibration verification test (bump test) to ensure proper
performance of the monitor. Failure to do so may adversely affect product performance and result in serious injury or death.
When performing a calibration verification test (bump test) only use certified calibration gas at the required concentration level.
o Do not test with expired calibration gas.
o Do not cover or obstruct display or visual alarm cover.
o Ensure sensor inlets are unobstructed and is free of debris

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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-6”x” provides CO2 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 CO2 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 CO2 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. CO2 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 CO2 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 CO2 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-6H uses an automated background calibration program to set the clean air level on a regular basis. The CD-6H 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-6MC 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-6”x” 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 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-6”x” is not intended for use in hazardous locations or industrial applications such as refineries, chemical plants, etc. Do not mount
the CD-6”x” where the normal ambient temperature is below 32°F or exceeds 122°F (0°C or above 50°C). The CD-6”x” mounts on a
type 4S electrical box supplied by the contractor. Do not install the CD-6”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-6H is a low voltage, dual relay Carbon Dioxide (CO2) detector and automatic ventilation controller. The CD-6”x” uses a
microcomputer controlled, electronic system to measure the concentration of CO2, actuate relays and provide a 4-20 mA output. The
CD-6”x” has a low maintenance long life (15+ years) non-dispersive infrared (NDIR) sensor and optional gas test/calibration kits. The
CD-6”x” is a low-level meter capable of displaying from 0-5000 ppm of carbon dioxide.

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2.4 Features
 ETL LISTED to UL 61010-1, Certified to CAN/CSA Std. C22.2 No 61010-1
 Low level meter capable of displaying from 0-5000 ppm of CO2
 Sensor Resolution of 50 PPM
 The CD-6H uses an automated background calibration program to set the clean air level on a regular basis *
 The CD-6MC 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 controls starters of ventilations
 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-6H Only
**CD-6MC Only
2.5 Specifications
 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)
 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…, 2000 (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 CO2, 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

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3 INSTALLATION AND OPERATING INSTRUCTIONS
The following instructions are intended to serve as a general guideline for the use of the Macurco CD-6H / CD-6MC Carbon Dioxide
Detector. It is not to be considered all-inclusive, nor is it intended to replace the policy and procedures for each facility. If you have any
doubts about the applicability of the equipment to your situation, consult an industrial hygienist or call Technical Support at 844-325-
3050.
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 over exposure and
cause serious injury or death. For proper use, see supervisor or User Instructions, or call Technical Support at 844-325-3050.
3.1 Location
Mounting height will be dependent on the application. For applications with CO2 tanks 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 about 5,000 sq. ft. (465 sq. meters). The coverage depends
on air movement within the room or facility. Extra detectors may be needed near any areas where people work or where the air is
stagnant. The CD-6”x” mounts on a 4x4 electrical box supplied by the contractor. Do not install the CD-6”x” inside another box unless it
has good air flow through it. Do NOT mount the CD-6”x” 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 removed from the detector relays prior to
servicing the unit. Failure to do so may result in serious injury or death.
3.2 Installation
1. The CD-6”x” mounts on a 4” square (or 4x4) electrical box supplied by the contractor. Do not mount the CD-6”x” inside
another box, unless it has good air flow through it.
2. Connect the CD-6”x” 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-6”x’ 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 3.4
OPERATION of these User Instructions 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 3.4 OPERATION 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 set point). 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:

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 Carbon Dioxide concentration has dropped below fan setting
 Fan Relay Run time 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 CO2
3.2.1 4-20mA graph
3.2.2 Rear view

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3.2.3 Typical Installation in a room
3.2.4 Use with Alarm Panel

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3.2.5 Multiple CD-6 Installation
3.2.6 DVP-120 Control Panel Connection

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3.2.7 Alternate connection to alarm panel
In this application (3.2.7 Alternate connection to alarm panel) 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-6”x” 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 panel and the CD-6”x display will flash the error. *See the Trouble Fan Setting Option.
3.3 Power Up
The CD-6”x” 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 de-energized and re-energized (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.
3.4 Operation
1. With the display function turned “On”, the CD-6”x” will show the current concentration of CO2 ppm in the air. Normal
outdoor concentration ranges between 350-450 ppm. When the CO2 concentration reaches the Fan Relay setting
(2000ppm, for example) the display will flash back and forth between “FAn” and “2000”. With the display function
turned “Off”, the display does not show the CO2 concentration, but will show “FAn” as long as the fan relay is
activated.
2. With the display function turned “On” and the CO2 concentration reaching the Alarm Relay setting, (4000 ppm, for
example) the display will flash back and forth between “ALr” and “4000”. The buzzer will sound indicating “Alarm” if
the buzzer is turned “On”. With the display function turned off the display does not show the CO2 concentration, but
will show “ALr” when the Alarm relay is activated.
3. With the 4-20 mA function turned “On” and the CO2 concentration 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.

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3.5 Default Configuration – 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
2000 ppm
Fan Relay Delay
3 minutes
Fan Relay Minimum Runtime
0 minutes
Fan Relay Latching
Off
Trouble Fan Setting
Off
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-
20mA
On
To change settings, remove the Philips screw on the front of the CD-6”x”. Pull off the front cover of the unit.
3.5.1 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.

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3.5.2 Selecting Power Up Test Option – “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.
3.5.3 Selecting Display Option – “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.
3.5.4 Selecting Buzzer Option – “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 forth 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.
3.5.5 Selecting Alarm Relay Setting – “ArS”
To select the Alarm Relay Setting, 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 fifth selection is the “ArS” or Alarm Relay Setting. Push Next three times to get to “ArS” then
Enter. If the display is “dIS” (disabled) push Next to change it to 900, 1000, 1100, 1200, …, 4000 (default), 4800, 4900, 5000 ppm
(flashing) then push Enter to
confirm the change (solid) and push Enter again to return to “ArS” in the Con menu. Push Next until “End” is displayed then push Enter
to get back to normal operation.
3.5.6 Selecting Alarm Relay Configuration – “Arc”
To select the Alarm Relay 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 sixth selection is the “Arc” or Alarm Relay Configuration. Push Next four times to get to
“Arc” then Enter. If the relay is “nO” (normally open) push Next to turn it to “nC” (flashing) then push Enter to confirm the change (solid)
and push Enter again to return to “Arc” in the Con menu. Push Next until “End” is displayed then push Enter to get back to normal
operation.
3.5.7 Selecting Fan Relay Settings – “FrS”
To select the Fan Relay setting, 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 seventh selection is the “FrS” or Fan Relay setting. Push Next five times to get to “FrS” then
Enter. If the fan relay is “dIS” (disabled) push Next to change it to 600, 700, 800, 900…, 2000 (default)…, 4800, 4900, 5000 ppm (flashing)
then push Enter to confirm the change (solid) and push Enter again to return to “FrS” in the Con menu. Push Next until
“End” is displayed then push Enter to get back to normal operation.
3.5.8 Selecting Fan Relay Delay – “Frd”
To select the Fan Relay Delay setting, 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 eighth selection is the “Frd” or Fan Relay Delay. Push Next six times to get to “Frd” then
Enter. If the delay is “0” (disabled) push Next to change it to 1, 3, 5, or 10 minutes (flashing) then push Enter to confirm the change
(solid) and push Enter again to return to “Frd” in the Con menu. Push Next until “End” is displayed then push Enter to get back to
normal operation.
3.5.9 Selecting Fan Relay Minimum Runtime – “Frr”
To select the Fan Relay Minimum Runtime setting, 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 ninth selection is the “Frr” or Fan Minimum Run Time. Push Next seven
times to get to “Frr” then Enter. If the runtime is “0” (disabled) push Next to change it to 3, 5, 10 or 15 minutes (flashing) then push
Enter to confirm the change (solid) and push Enter again to return to “Frr” in the Con menu. Push Next until “End” is displayed then
push Enter to get back to normal operation.

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3.5.10 Selecting Fan Relay Latching Option – “FrL”
To select the Fan Relay Latching Option, 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 tenth selection is the “FrL” or Fan Relay Latching Option. Push Next nine times to get to
“FrL” then Enter. If latching is “OFF” push Next to turn it to “ON” (flashing) then push Enter to confirm the change (solid) and push
Enter again to return to “FrL” in the Con menu. Push Next until “End” is displayed then push Enter to get back to normal operation.
3.5.11 Selecting Trouble Fan Setting Option – “tFS”
To select the Trouble Fan Setting Option, 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 eleventh selection is the “tFS” or Trouble Fan Setting Option. Push Next ten times
to get to “tFS” then Enter. If Trouble Fan Setting is “OFF” push Next to turn it to “ON” (flashing) then push Enter to confirm the change
(solid) and push Enter again to return to “tFS” in the Con menu. Push Next until “End” is displayed then push Enter to get back to
normal operation.
3.5.12 Selecting 4-20mA Output Option – “420”
To select the 4-20mA Output Option, 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 twelfth selection is the “420” or 4-20mA Output Option. Push Next eleven times to get to
“420” then Enter. If the 4-20mA is “On” push Next to turn it to “OFF” (flashing) then push Enter to confirm the change (solid) and push
Enter again to return to “420” in the Con menu. Push Next until “End” is displayed then push Enter to get back to normal operation.
3.6 Onboard Diagnostics
The CD-6”x” monitors all critical functions of the unit through software diagnostics that continuously test and verify unit operations. If a
problem is found, the unit will switch to a fail-safe/error mode or trouble condition. In this error mode, the Alarm relay will be activated,
the 4-20 mA current loop will go to 24 mA, the unit will display the error code, the green status indicator LED light will flash and the
buzzer will chirp intermittently. The Fan relay will also engage if the Trouble Fan Setting Option is set to “ON”. This is a safety
precaution. To clear this mode, simply turn off power to the unit for a few seconds or push the ENTER/TEST switch (inside the unit).
This will cause the unit to restart the 1-minute self-test cycle.
3.6.1 The 4-20 mA signal can be used for troubleshooting:
 0 mA is most likely a connection problem
 4-20 mA is normal gas reading range (0-5000 ppm)
 24 mA indicates a Trouble condition
3.6.2 Error Codes
 t001 - Trouble with sensor signal
 t002 - Temperature compensation failed
 t004 - EEPROM bad checksum
 t008 - IR lamp trouble
 t010 - Bad EEPROM
 t020 - Bad calibration
 t040 - Factory calibration failure
 t080 - ADC trouble
 t100 - Under range
 t200 - Sensor expired
 t400 - Pressure sensor trouble
 t800 - PCBA not tested
If the error mode repeats frequently, check for continuous power and proper voltage. If power is not the problem and a unit has
repeating error conditions, it may need to be returned to Macurco for service, per these User Instructions.
If the error mode indicates “Sensor expired” see section 4.1 End-of-life Signal of these User Instructions.

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4 Maintenance
The CD-6”x” is low maintenance. The unit uses a long life NDIR sensor that has a 15-year life expectancy (in normal conditions). The
CD-6H uses an automated background calibration program to set the clean air level on a regular basis. The CD-6H 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.
Note: This applies when used in typical indoor ambient air with weekly unoccupied periods.
All maintenance and repair of products manufactured by Macurco are to be performed at the appropriate Macurco manufacturing facility.
Macurco does not sanction any third-party repair facilities.
Note: There is not a field calibration procedure for the Macurco CD-6H.
4.1 End-of-life Signal
The CD-6”x” has a long life, non-replaceable infrared sensor (IR Sensor). Fifteen (15) years after the CD-6”x” is installed the sensor end-
of-life signal will be activated indicating that the CD-6”x” has reached the end of its typical usable life. The end-of-life signal will cause an
error code t200 “Sensor expired”. See section 3.6.2 Error Codes. The end-of-life signal can be silenced for 48 hours by pressing the
"ENTER/TEST" button or by temporarily dropping power to the unit. The end-of-life signal provides the user an opportunity to test and/or
calibrate the sensor (CD-6MC only) assuring that it is still performing within acceptable parameters though the sensor is nearing the end
of its expected life. The silence function will continue to be available for 29 days after the CD-6”x” initiates the initial end-of-life signal.
After this 29-day period the CD-6”x” can no longer be silenced and the unit must be replaced.
WARNING
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 intrinsic safety, which may adversely affect product performance and result in
sickness or death.
CAUTION
Avoid the use of harsh cleaning materials, abrasives and other organic solvents. Such materials may permanently scratch the surfaces
and damage the display window, labels, sensor or instrument housing. High voltage terminals (100-240VAC) 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 removed from the detector prior to cleaning the unit. Failure to do so may result in serious injury or death.
4.2 Cleaning
Cleaning of the external surfaces is best carried out using a damp cloth with a mild detergent or soap. Use a vacuum cleaner with soft
brush to remove dust or contamination under the cover. Do not blow out the sensor with compressed air.
4.3 Testing
WARNING
Using a certified gas with a concentration other than the one listed for this detector when conducting a 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 and cause sickness or death. For proper use, see supervisor or User Instructions, or call Technical Support at
844-325-3050
4.3.1 General
All CD-6”x” units are factory calibrated and 100% tested for proper operation. During normal operation the green status indicator LED
light will be on steady, the fan & alarm relay will be in standby mode and the 4-20 mA output will be at 4mA (in clean air). The unit also
performs a regular automatic self-test during normal operation. If the unit detects an improper voltage or inoperable component, it will
default into Error mode. In this error mode, the Alarm relay will be activated, the 4-20 mA current loop will go to 24 mA, the unit will
display the error code, the green status indicator LED light will flash, and the buzzer will chirp intermittently. The Fan relay will also
engage if the Trouble Fan Setting Option is set to “ON”.

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4.3.2 Operation Test
Check that the green CD-6”x” status indicator LED light is illuminated continuously. If not, do not proceed with the tests. If the unit is in
error mode, contact your local representative or Macurco technical support representative for information on resolving the problem.
1. Remove the single screw in the middle of the front cover of the CD-6”x”.
2. Remove the front cover.
3. Observe the LED light on the front of the CD-6”x”.
4. If the light is solid green proceed to step 6.
5. If the green status indicator LED light is off or flashing, refer to the General section above.
6. Locate the switch labeled ENTER/TEST on the left side of the printed circuit board. Press the Test switch once.
7. The CD-6”x” will step through a cycle test:
a. The display progresses through the BUZ (Buzzer Test), Art (alarm relay test), Frt (fan relay test) then 42t (4-20 mA
output test). Make sure that the settings are “on” or not disabled “diS”.
b. During the first 10 seconds of the test cycle, the display will show BUZ and set off the audible buzzer
c. The alarm relay will be closed, so any devices connected to that relay will be tested.
d. The Fan relay will be activated for the next 1 minute of the test, so if the fan circuits are wired in the normal manner,
the fan should run.
e. The 4-20mA output will then ramp up from 4 to 16 mA over the next 130 seconds of the test, so if the circuit is wired
in the normal manner, the control panel or building automation system should respond.
f. At the end of the test cycle, the light will turn green and be on steady (Normal Operation), the fan & alarm relay will
be in standby mode and the 4-20 mA output will return to 4 mA (in clean air).
8. When testing is completed reassemble the unit or units.
4.3.3 Manual Operation Test
This option gives the user the opportunity to manually initiate an individual test for each relay, the analog output and the sensor response
to gas.
From normal operation mode press the Next button 3 times to get to the Test Mode (tSt).
Press the Enter button once to get into the Test Menu.
Press the Next button to scroll through the four test options and press Enter to initiate the selected test.
Note that if the relay or 4–20 mA output has been disabled, the test selection will not be displayed in the test menu.
bUZ- Buzzer Test, 3 seconds
Art - Alarm Relay Test, 10 seconds
Frt - Fan Relay Test, 60 seconds
42t - 420 loop test, 25 seconds
gtS - Gas Test, 3 minutes (no output to the panel during the gas test)
The display will flash during the test, or in the case of the gas test, the gas level will alternate with gtS. Once the test is complete, the
display will return to steady display. To exit the test menu, press the Next button until “End” is displayed then, press Enter to return to
normal mode.
4.3.4 Carbon Dioxide Gas Test
WARNING
The following steps must be performed when conducting a calibration verification test (bump test) to ensure proper performance of the
monitor. Failure to do so may adversely affect product performance and result in serious injury or death.
 When performing a calibration verification test (bump test) only use certified calibration gas at the required concentration level.
 Do not test with expired calibration gas.

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 If the instrument cannot be calibrated, do not use until the reason can be determined and corrected.
 Do not cover or obstruct display or visual alarm cover.
 Ensure sensor inlets are unobstructed and is free of debris.
4.3.5 Field Calibration Kit – CD6-FCK
A Field Calibration Kit, CD6-FCK, is needed to complete a CO2 gas test. These are available through local distribution.
 CD6-FCK: (2) Gas Cylinders
o (1) 34L 400ppm carbon dioxide (CO2) in air
o (1) 34L 5000ppm carbon dioxide (CO2) in air
 Gas regulator 0.2 LPM
 About two feet of tubing
 CD-6-TH calibration hood
4.3.6 FCK Information
Several detectors can be calibrated with one FCK. The only limitation is the amount of gas in the cylinder. The 34-liter cylinder has
approximately 175 minutes of continuous test run time. Replacement cylinders are available. The gas cylinder should be replaced when
the pressure gauge on the regulator shows 25-psi or less or has reached its expiration date.
Note: For optimum test results it is suggested that the unit be in clean air, green light on, and be in a low ambient air flow.
4.3.7 Gas Testing
4.3.8 Testing the Fan Relay
1. Remove the Philips screw on the front of the CD-6”x”. Remove the front cover.
2. Open the FCK. Connect the 5000-ppm gas cylinder to the regulator.
3. Check the pressure gauge on the regulator. If you have 25-psi or less you will need to replace the gas canister.
Check the expiration date on the cylinder, if it has passed the expiration date the cylinder should be replaced.
4. Assemble regulator, hose and Test Hood and place the Test Hood over the CO2 sensor.
Note: The time to activate the Fan relay depends on the delay setting. See section 3.5.8 Selecting Fan Relay Delay

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5. Turn on the regulator to start the gas flow and wait with the gas applied continuously.
6. With the display function turned “On”, the CD-6”x” will show the current concentration of CO2 in the air. When the CO2
concentration reaches the Fan Relay setting (2000 ppm, for example) the display will flash back and forth between “FAn” and
“2000”. With the display function turned ”Off”, the display does not show the CO2 concentration, but will show “FAn” as long as
the fan relay is activated.
Note: If the Fan relay does not close within 2 minutes, there are five possibilities:
a. Gas cylinder is empty, check the pressure gauge. Replace the gas cylinder if 25psi or less.
b. Gas cylinder has reached its expiration date. Replace the gas cylinder.
c. Unit needs to be re-calibrated (automated background calibration for CD-6H, Manual Calibration for CD-6MC) then
re-test. Detector is in need of servicing (contact Technical Support for at 844-325-3050 servicing options).
a. Detector has fan relay set to disable (diS). Set fan relay to 2000 ppm and repeat the test.
b. Detector has fan relay delay set to 3 minutes. Set fan relay delay to 0 and repeat the test.
7. Remove the gas from the sensor. Proceed to Test the Alarm relay or replace the top cover.
4.3.9 Testing the Alarm Relay
Note: The CO2 concentration to activate the Alarm relay depends on the setting.
1. Connect the 5000-ppm cylinder of carbon dioxide to the regulator.
2. Check the pressure gauge on the regulator. If you have 25-psi or less, you will need to replace the gas canister.
Check the expiration date on the cylinder, if it has passed the expiration date the cylinder should be replaced.
3. Place the Test Hood over the CO2 sensor. Turn on the regulator to start the gas flow.
4. The Fan relay should activate according to the settings.
5. With the display function turned “On” and the CO2 concentration reaching the Alarm Relay setting, (4000 ppm, for
example) the display will flash back and forth between “ALr” and “4000”. The buzzer will sound indicating “Alarm” if
the buzzer is turned “On”. With the display function turned off the display does not show the CO2 concentration, but
will show “ALr” when the Alarm relay is activated.
Note: If the Alarm relay fails to operate within 2 minutes, there are four possibilities:
a. Gas cylinder is empty, check the pressure gauge. Replace the gas cylinder if 25-psi or less.
b. Unit needs to be re-calibrated (automated background calibration and re-test).

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c. Detector is in need of servicing (return unit to factory for servicing).
d. Detector has Alarm relay set to disable (diS). Set Alarm relay to 4000 ppm and repeat the test.
6. Remove the gas from the sensor after Test. Proceed to Test the 4-20mA output or replace the top cover.
4.3.10 Testing the 4-20mA current loop
1. Connect the 5000-ppm cylinder of carbon dioxide to the regulator.
2. Check the pressure gauge. If there is 25-psi or less the cylinder should be replaced.
3. Place the cap from the regulator over the CO2 sensor. Turn on the regulator to start the gas flow.
4. The Fan relay should activate according to the settings.
5. The Alarm relay should activate according to the settings.
6. The 4-20 mA output should ramp up from 4mA in clean air to 20mA at 5000 ppm. See 4-20 mA diagram.
Note: If the 4-20mA output does not ramp up within 2 minutes, there are four possibilities:
a. Gas cylinder is empty, check the pressure gauge. Replace the gas cylinder if 25-psi or less.
b. Unit needs to be re-calibrated (automated background calibration and re-test).
c. Detector is in need of servicing (return unit to factory for servicing).
d. Detector has 4-20 mA option set to “OFF”. Set 4-20mA option to “On” and repeat the test.
7. Remove the gas from the sensor. Re-assemble the CD-“x” (make sure the LED is aligned with the front case hole).
You are done.
4.3.11 Manual Calibration – CD-6MC ONLY
Note: For optimum calibration results the unit should be in clean air and be in a low ambient air flow.
1. Remove the Philips screw on the front of the CD-6MC. Remove the front cover.
2. Open the FCK. Connect the 400-ppm gas cylinder to the regulator.
3. Check the pressure gauge on the regulator. If you have 25-psi or less you will need to replace the gas canister.
Check the expiration date on the cylinder, if it has passed the expiration date the cylinder should be replaced.
4. Assemble regulator, hose and Calibration Hood and place the hood over the CO2 sensor.