Macurco CX-6 User manual

IMPORTANT: Keep these user instructions for reference.
Macurco™ CX-6, CX-12
Carbon Monoxide & Nitrogen Dioxide Combination Detector,
Controller and Transducer
User Instructions

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1 General Safety Information...................................................................................................................................... 4
1.1 General Description.......................................................................................................................................... 4
1.2 List of warnings................................................................................................................................................. 4
2 Use 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
3 Installation and Operating Instructions.................................................................................................................... 7
3.1 Location ............................................................................................................................................................ 7
3.2 Installation........................................................................................................................................................ 8
3.2.1 6-Series Low Voltage ................................................................................................................................ 8
3.2.2 12-Series Line Voltage ............................................................................................................................13
3.3 Terminal Connection ......................................................................................................................................18
3.3.1 6-Series Low Voltage ..............................................................................................................................18
3.3.2 12-Series Line Voltage ............................................................................................................................19
4 Operations..............................................................................................................................................................20
4.1 Power up.........................................................................................................................................................20
4.2 Display turned “On” .......................................................................................................................................20
4.3 Display turned “Off” ....................................................................................................................................... 21
4.4 4-20mA Loop ..................................................................................................................................................22
4.5 Configuration “CON” ......................................................................................................................................22
4.5.1 Default – Factory Settings ......................................................................................................................23
4.5.2 Select Default Configuration – “dEF” ..................................................................................................... 23
4.5.3 Select Power-Up Test Setting – “PUt” ....................................................................................................23
4.5.4 Select Display Configuration – “dSP”...................................................................................................... 24
4.5.5 Select Buzzer Configuration – “bUZ”......................................................................................................24
4.5.6 Select Alarm Relay Setting for CO – “ArS.C”...........................................................................................24
4.5.7 Select Alarm Relay Setting for NO2 – “ArS.n” ........................................................................................ 25
4.5.8 Select Alarm Relay Configuration – “Arc” ..............................................................................................25
4.5.9 Select Fan Relay Setting for CO – “FrS.C” ...............................................................................................25
4.5.10 Select Fan Relay Setting for NO2 – “FrS.n”............................................................................................. 26
4.5.11 Select Fan Relay Delay Setting – “Frd” ................................................................................................... 26
4.5.12 Select Fan Relay Minimum Runtime Setting – “Frr”...............................................................................26
4.5.13 Select Fan Relay Latching Setting – “FrL” ............................................................................................... 27
4.5.14 Select Trouble Fan Setting – “tFS”..........................................................................................................27
4.5.15 Select 4-20mA Output Setting – “420”................................................................................................... 27
4.5.16 Select 4-20mA Mode – “420.n”..............................................................................................................28
4.5.17 Select Calibration Period for CO Sensor – “CAL.C”.................................................................................28
4.5.18 Select Calibration Period for NO2Sensor – “CAL.n” ...............................................................................29
5 Troubleshooting ..................................................................................................................................................... 29

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5.1 On-Board Diagnostics .....................................................................................................................................29
5.1.1 4-20mA troubleshooting ........................................................................................................................29
5.1.2 Trouble Codes.........................................................................................................................................29
5.2 Sensor Poisons................................................................................................................................................ 31
5.3 Sensor Expired................................................................................................................................................31
6 Maintenance........................................................................................................................................................... 32
6.1 Sensor Life Reset ............................................................................................................................................32
6.2 Cleaning ..........................................................................................................................................................33
7 Testing ....................................................................................................................................................................33
7.1 Testing ............................................................................................................................................................33
7.1.1 Operation Test........................................................................................................................................ 33
7.1.2 Manual Operation Test........................................................................................................................... 34
7.2 Calibration and Test Kits.................................................................................................................................34
7.3 Gas Testing ..................................................................................................................................................... 36
7.3.1 Testing the Fan Relay..............................................................................................................................36
7.3.2 Testing the Alarm Relay..........................................................................................................................37
7.3.3 Testing the 4-20mA loop ........................................................................................................................37
7.3.4 Aerosol Carbon Monoxide Test (Carbon Monoxide only)......................................................................37
7.4 Field Calibration Procedure............................................................................................................................38
7.4.1 Zero Calibration for CO Sensor............................................................................................................... 38
7.4.2 Zero Calibration for NO2Sensor .............................................................................................................38
7.4.3 Span Calibration for CO Sensor ..............................................................................................................39
7.4.4 Span Calibration for NO2Sensor.............................................................................................................39
8 Appendix A – Table of Figures ................................................................................................................................ 41
9 Appendix B – Menu Structure ................................................................................................................................ 42
9.1 Main Menu .....................................................................................................................................................42
9.2 Auto Test Menu “bUZ” ................................................................................................................................... 43
9.3 Configuration Menu “CON”............................................................................................................................44
9.4 Select Test Menu “tst”.................................................................................................................................... 51
9.5 CAL Menu ....................................................................................................................................................... 52
9.6 SEn Menu........................................................................................................................................................54
10 Macurco Gas Detection Product limited warranty............................................................................................. 55
Technical Support Contact Information......................................................................................................................55
General Contact Information...................................................................................................................................... 55

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1General Safety Information
The following instructions are intended to serve as a guideline for the use of the Macurco CX-6 and CX-12 Carbon
Monoxide & Nitrogen Dioxide Combination Detector. This manual will refer to these devices as CX-xx 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 General Description
The Macurco CX-xx is a commercial style combination Carbon Monoxide and Nitrogen Dioxide Gas
Detector/Transducer. It is an electronic detection system used to measure the concentration of CO and NO2and
provide feedback and automatic exhaust fan control to help reduce CO and NO2concentrations in parking garages,
maintenance facilities or other commercial applications.
It is available in both a low voltage (CX-6) and line voltage (CX-12) option. The CX-xx is a low-level meter capable of
displaying in the range 0-200 ppm (parts per million) of Carbon Monoxide and 0-20 ppm of Nitrogen Dioxide. The
CX-xx has selectable 4-20 mA output, buzzer and digital display options. The CX-xx is factory calibrated and 100%
tested for proper operation but can also be calibrated in the field.
The CX-xx is intended to be mounted on a 4 x 4 electrical box. It can operate in a stand-alone application or can be
connected to a building automation system, UL listed Control Panel, or other control device that accepts 4-20mA
analog input. The CX-xx is compatible with the Macurco DVP Control Panel.
1.2 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 0°F or above 125°F (-18°C or above
52°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

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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 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 verification test
(bump test) to ensure proper performance of the monitor. Failure to do so may
adversely affect product performance.
•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.
•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.
2Use Instructions and Limitations
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 CX-xx provides CO and NO2detection and automatic exhaust fan control for automotive maintenance facilities,
enclosed parking garages, utility rooms, warehouses and other commercial applications where the potential for
Carbon Monoxide and/or Nitrogen Dioxide gas exists. The CX-xx meets the requirements of the Uniform Building
Code for enclosed garages and meets OSHA standards for CO and NO2exposure. The CX-xx can be used stand alone,
with the Macurco DVP-120 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

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injury or death. For proper use, see supervisor or user manual, or contact Technical
Support at 1-844-325-3050.
2.2 Do NOT use for
The CX-xx is not intended for use in hazardous locations or industrial applications such as refineries, chemical plants,
etc. Do not mount the CX-xx where the normal ambient temperature is below 0°F or exceeds 125°F (-18°C or above
52°C). The CX-xx mounts on a type 4S electrical box supplied by the contractor. Do not install the CX-xx inside
another box unless it has good air flow through it.
WARNING
This equipment may not function effectively below 0°F or above 125°F (-18°C or above
52°C). Using the detector outside of this temperature range may adversely affect
product performance.
2.3 Features
•ETL LISTED Certified to CSA C22.2 No 61010-1, Conforms to UL Std. 61010-1
•Low-level meter capable of displaying from 0-200 ppm of CO and 0-20 ppm of NO2
•The CX-xx meets the Uniform Building Code for enclosed garages and meets OSHA standards for CO and NO2
exposure
•Selectable fan and alarm relay activation
•5 A SPDT fan relay controls starters of exhaust fans
•0.5 A N.O. or N.C. alarm relay connects to warning devices or control panels
•4-20 mA Current Loop
•CX-xx 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
•Calibration kit is available. One screw allows access for calibration or gas test
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 for CO: selectable at dIS (disable), 15, 25, 35 (default), 50 or 100 ppm
•Fan relay actuation for NO2: selectable at dIS (disabled) 0.5, 0.7, 1.0, 1.2, 1.5, 1.7, 2.0, 2.2, 2.5 (default), 2.7,
3.0, 3.2, 3.5, 3.7, 4.0, 4.2, 4.5, 4.7, 5.0 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 not latching (default) selectable
•Alarm relay: 0.5A 120 V, 60 VA
•Alarm relay actuation: selectable N.O. (default) or N.C.

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•Alarm relay settings for CO: dIS, 50, 100, 150, and 200 ppm (default)
•Alarm relay settings for NO2: dIS, 1, 2, 3, 4, 5 (default), 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 ppm
•Current Loop 4-20 mA, selectable to ’bAS’ (default), ‘EnH’, OFF
•Calibration Period Settings: dis(default), 3, 6, 12 and 24 (months)
•Buzzer: 85 dBA at 10cm settable to On (default) or OFF.
•Digital display: 4-digit LED selectable to On (default) or OFF.
•Operating Environment: 0°F to 125° F (-18oC to 52oC),10 to 90% RH non-condensing
2.4.1 6-Series Low Voltage
•Power: 3 W (max) from 12 to 24 VAC or 12 to 32 VDC
•Current @ 24 VDC: 75 mA in alarm (two relays), 50 mA (fan relay only) and 23 mA standby
2.4.2 12-Series Line Voltage
•Power: 100-240VAC (50 TO 60 HZ)
•Current: 1.0 A MAX
3Installation and Operating 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
A CX-xx is normally mounted 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. Do NOT mount the CX-xx where the normal ambient
temperature is below 0°F or exceeds 125°F (below -18°C or above 52°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.

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3.2 Installation
3.2.1 6-Series Low Voltage
1. The CX-6 mounts on a 4” square (or 4x4) electrical box supplied by the contractor. Do not mount the CX-6
inside another box, unless it has good air flow through it.
2. Connect the CX-6 to Class 2 listed 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.
3. Connect the CX-6 to the control cables with terminal plugs. When making connections, make sure the power
is off.
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 4.5 Configuration “CON” 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:
a. if either the CO or NO2gas concentration exceeds the alarm set point. It will deactivate once the gas
concentration drops below the alarm set point. Note that setting both “ArS.C” and “ArS.n” to “diS”
will disable the alarm relay.
b. during a power up test “PUt”.
c. when a trouble condition is present.
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 4.5
Configuration “CON” 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 Monoxide or Nitrogen 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 of the following conditions have been met:
•Carbon Monoxide and Nitrogen Dioxide concentration have 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 0-200ppm CO and 4-20 mA for 0-20ppm NO2. There
are two terminals and polarity is marked on the connector.
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).

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Figure 3–1 6-Series 4-20 mA CO Output diagram
Figure 3–2 6-Series 4-20 mA NO2 Output diagram

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Figure 3–3 6-Series Rear View
Figure 3–4 6-Series Typical Installation

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Figure 3–5 6-Series Multiple Devices
Figure 3–6 6-Series Alarm Control Panel

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Figure 3–7 6-Series DVP-120 Control Panel
Figure 3–8 6-Series Alternate Alarm Panel
In this application (above) 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 CX-6 monitors all critical
functions of the unit through software diagnostics that continually test and verify its operations. If a problem is

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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 CX-6 display will flash the error.
*See section 4.5.14 Select Trouble Fan Setting – “tFS” for options.
Figure 3–9 6-Series Horn & Strobe Combo Wiring
Macurco External Horn/Strobe model number is HS-X, where X represents lens color, R for red lens cover, G for
green lens cover, B for blue lens cover, A for amber lens cover, C for clear lens cover. Sound pressure for
Horn/Strobe model is at least 85dB at 10 feet.
3.2.2 12-Series Line Voltage
1. The CX-12 mounts on a 4” square (or 4x4) electrical box supplied by the contractor. Do not mount the CX-12
inside another box, unless it has good air flow through it.
2. There are two terminals for the mains power connection labeled L (line) and N (neutral). Mains connections
should be done in accordance with National and Local Electrical Codes. Only qualified personnel should
connect mains power to any device.
3. There are two terminals for the dry alarm relay contacts 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 4.5 Configuration “CON” for details on relay settings.
4. The alarm relay can be configured to normally open (default) (N.O.) or normally closed (N.C.) and will
activate:
a. if either the CO or NO2gas concentration exceeds the alarm set point. It will deactivate once the gas
concentration drops below the alarm set point. Note that setting both “ArS.C” and “ArS.n” to “diS”
will cause the alarm relay not to engage.
b. during a power up test “PUt”.
c. when a trouble condition is present.
5. 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 4.5
Configuration “CON” for details on relay settings.
+
Macurco External
Horn/Strobe
16-33
VDC
N.O.
POWER
-
N.C.
CX-6
+
-
+
+
-
-
Power
Power
VDC or
12-32
12-24
VAC
Transformer
16-33
VDC
Transformer

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6. 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.
7. The Fan Relay will engage if the fan setting Carbon Monoxide or Nitrogen 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 of these conditions have been met:
•Carbon Monoxide and Nitrogen Dioxide concentrations have 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.
8. The Current Loop is 4 mA in clean air and 4-20 mA for 0-200ppm CO and 4-20 mA for 0-20ppm NO2. There
are two terminals and polarity is marked on the connector.
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).
Figure 3–10 12-Series 4-20 mA CO Output diagram

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Figure 3–11 12-Series 4-20 mA NO2 Output diagram
Figure 3–12 12-Series Rear View

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Figure 3–13 12-Series Typical Installation
Figure 3–14 12-Series Multiple Device diagram

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Figure 3–15 12-Series Alarm Control Panel
Figure 3–16 12-Series DVP-120 Control Panel

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Figure 3–17 12-Series Alternate Alarm Panel
Figure 3–18 12-Series Horn & Strobe Combo Wiring
Macurco External Horn/Strobe model number is HS-X, where X represents lens color, R for red lens cover, G for
green lens cover, B for blue lens cover, A for amber lens cover, C for clear lens cover. Sound pressure for
Horn/Strobe model is at least 85dB at 10 feet.
3.3 Terminal Connection
3.3.1 6-Series Low Voltage
Except for 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).

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3.3.1.1 Mains Power Connection
Connect the CX-6 to Class 2 listed 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 CX-6 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 of 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 22 AWG. To
install the wiring for the relays, disconnect the connector from the header. 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. 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 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 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.
3.3.2 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.
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).
3.3.2.1 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 22 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.

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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 of 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 22 AWG. To
install the wiring for the relays, disconnect the connector from the header. 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. 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 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.
3.3.2.4 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 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.
4Operations
4.1 Power up
The CX-xx 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”).
•The alarm relay will be activated for 10 seconds and the fan relay for 60 seconds during the power-up cycle
(if PUt is ON).
•The indicator light (LED) will flash green during the self-test cycle.
•4-20mA will ramp up to 16mA during the warmup (if 420 is ON and PUt is ON).
•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”
With the display (“dSP”) setting turned “On”, the detector will operate as follows: