CO Guardian 452-201 User manual

CO Guardian LLC Document No. 03-452-201
1951 E. AIRPORT DRIVE Date: 8-20-2004
TUCSON, AZ. 85706 REV F
MODEL 452-201 OWNERS MANUAL Page 1 of 22
CO Guardian LLC
1951 E. Airport Dr.
Tucson, AZ 85706
OWNERS MANUAL
CARBON MONOXIDE DETECTOR MODEL 452-201
REMOTE UNIT

CO Guardian LLC Document No. 03-452-201
1951 E. AIRPORT DRIVE Date: 8/20/2006
TUCSON, AZ. 85706 REV F
MODEL 452-201 OWNERS MANUAL Page 2 of 22
INTENTIONALLY LEFT BLANK

CO Guardian LLC Document No. 03-452-201
1951 E. AIRPORT DRIVE Date: 8/20/2006
TUCSON, AZ. 85706 REV F
MODEL 452-201 OWNERS MANUAL Page 3 of 22
LOG OF REVISIONS
REV
NO.
PAGE
NO. DATE DESCRIPTION
APPROVED
A 1 thru 20 03/20/03 Initial Release ASH VIJ
B 1 thru 20 03/25/03 Added placard callout to
Par. 6.2 (a.), Page 12.
ASH VIJ
C 1 thru 20 11/03/04 Revised for all Applicable
Aircraft
ASH VIJ
D 1 thru 20 11/17/04 Revised pages 1,310,13,
21, 22 and 23
ASH VIJ
E 1 thru 20 5/4/05 Revised pages 7, 8 and
12
ASH VIJ
F 1 thru 20 8/20/06 Revised pages 7, 8, 12,
13, 14, 5 and 21
ASH VIJ

CO Guardian LLC Document No. 03-452-201
1951 E. AIRPORT DRIVE Date: 8/20/2006
TUCSON, AZ. 85706 REV F
MODEL 452-201 OWNERS MANUAL Page 4 of 22
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CO Guardian LLC Document No. 03-452-201
1951 E. AIRPORT DRIVE Date: 8/20/2006
TUCSON, AZ. 85706 REV F
MODEL 452-201 OWNERS MANUAL Page 5 of 22
TABLE OF CONTENTS
LOG OF REVISIONS ................................................................................................................................................. 3
TABLE OF CONTENTS.......................................................................................................................................... 5
DESCRIPTION........................................................................................................................................................... 7
1.0 GENERAL.................................................................................................................................................... 7
2.0 PHYSICAL DESCRIPTION ......................................................................................................................... 7
TABLE 1 - Part Numbers .................................................................................................................................... 7
3.0 LEADING PARTICULARS........................................................................................................................... 8
TABLE 2 - Leading Particulars............................................................................................................................ 9
4.0 SCOPE ...................................................................................................................................................... 10
5.0 SERVICE FACILITIES............................................................................................................................... 10
6.1 RECOMMENDED INSTALLATION AREAS.............................................................................................. 12
FIGURE 1 - TYPICAL RIGHT INSTRUMENT PANEL...................................................................................... 12
FIGURE 2 - TYPICAL PILOT INSTALLATION SHOWN .................................................................................. 12
6.2 INSTALLATION INSTRUCTIONS ............................................................................................................. 13
6.2.1 INSTALLATION INSTRUCTIONS (PART NUMBERS 452-201-001 through -004) ........................... 13
6.2.2 INSTALLATION CHECKS (PART NUMBERS 452-201-001 through -004)........................................... 14
6.2.3 INSTALLATION INSTRUCTIONS (PART NUMBERS 452-201-005 through -008)............................... 14
6.2.4 INSTALLATION CHECKS .................................................................................................................. 15
7.0 MAINTENANCE INSTRUCTIONS............................................................................................................. 16
8.0 CARBON MONOXIDE DETECTOR SCHEDULED MAINTENANCE ....................................................... 17
9.0 WEIGHT AND BALANCE / EQUIPMENT LIST......................................................................................... 17
10.0 LIMITATIONS......................................................................................................................................... 18
11.0 NORMAL PROCEDURES ..................................................................................................................... 18
10.1 SELF TEST SEQUENCE .................................................................................................................. 18
12.0 PERFORMANCE ................................................................................................................................... 18
13.0 EMERGENCY PROCEDURES.............................................................................................................. 19
14.0 UNIT FAILURE INDICATION:................................................................................................................ 20
15.0 RS-232 DATA BUSS OPTION............................................................................................................... 20
16.0 Warranty................................................................................................................................................. 21

CO Guardian LLC Document No. 03-452-201
1951 E. AIRPORT DRIVE Date: 8/20/2006
TUCSON, AZ. 85706 REV F
MODEL 452-201 OWNERS MANUAL Page 6 of 22
FORWARD
This document provides information intended for use by persons who, pursuant to current regulatory requirements,
are qualified to install this equipment. Because equipment and system installations vary depending on a particular
aircraft, this document is intended only as a guideline. If further information is required, contact:
CO Guardian, LLC
1951 E. Airport Drive
Tucson, AZ 85706
[phone]
[phone]
www.Coguardian.com
We welcome your comments concerning this document. Although every effort has been made to keep it free of
errors, some may occur. When reporting a specific problem, please describe it briefly and include the document
number, the paragraph/figure/table number, and the page number. Send your comments to the address above.

CO Guardian LLC Document No. 03-452-201
1951 E. AIRPORT DRIVE Date: 8/20/2006
TUCSON, AZ. 85706 REV F
MODEL 452-201 OWNERS MANUAL Page 7 of 22
DESCRIPTION
1.0 GENERAL
This section gives a physical and functional description of the CO Guardian CO Detector
indicator as installed in a typical reciprocating engine type aircraft.
2.0 PHYSICAL DESCRIPTION
Remote mounted CO Detector part numbers are listed in Table 1.
PART
NUMBER
SERVICE
LIFE
Pressure
Relay*
POWER CONNECTOR DATA BUSS**
452-201-001 7 Years No 14 VDC 8 pin & 9 pin RS-232 Data Buss
452-201-002 7 Years No 28 VDC 8 pin & 9 pin RS-232 Data Buss
452-201-003 7 Years No 14 VDC 8 pin No Data Buss
452-201-004 7 Years No 28 VDC 8 pin No Data Buss
452-201-005 7 Years No 14 VDC 9 pin RS-232 Data Buss
452-201-006 7 Years No 28 VDC 9 pin RS-232 Data Buss
452-201-007 7 Years NO 14 VDC 9 pin RS-232 Data Buss
452-201-008 7 Years NO 28 VDC 9 pin RS-232 Data Buss
452-201-009 7 Years Yes 14 VDC 9 pin RS-232 Data Buss
452-201-010 7 Years Yes 28 VDC 9 pin RS-232 Data Buss
TABLE 1 - Part Numbers
The Detector must be returned to CO Guardian at the end of Service Life for replacement and
calibration of the CO sensor to maintain airworthiness of the unit.
*Pressure relay is designed for information purpose. The relay is activated at 10,000 feet for 5
seconds and remains on after 12,500 feet using the pressure sensor built in the 452 models.
** RS-232 data is transmitted to MFD Displays like the Garmin G1000 and Garmin GNS480
that displays CO Level, Cabin Temperature, Cabin Pressure and has the capability of being
remotely reset able using RS232 input into the detector. See the Manufacturers installation
manual for hookup and data display capabilities.
**RS-232 data is transmitted to MFD Displays like the Garmin G3X, G1000 and Garmin
GNS480 that displays CO Level, Cabin Pressure and has the capability of being remotely reset
able using RS232 input into the detector with certain MFDs. See the Manufacturers installation
manual for hookup and data display capabilities.

CO Guardian LLC Document No. 03-452-201
1951 E. AIRPORT DRIVE Date: 8/20/2006
TUCSON, AZ. 85706 REV F
MODEL 452-201 OWNERS MANUAL Page 8 of 22
3.0 LEADING PARTICULARS
Table 2 lists the CO Detector leading particulars. Model 452-201 Series CO Detectors are
approved to TSO C48A.

CO Guardian LLC Document No. 03-452-201
1951 E. AIRPORT DRIVE Date: 8/20/2006
TUCSON, AZ. 85706 REV F
MODEL 452-201 OWNERS MANUAL Page 9 of 22
LEADING PARTICULARS
PARAMETER SPECIFICATION
PHYSICAL
Dimensions (approximate)
Weight (actual)
ENVIRONMENTAL
Cooling
Temperature and Altitude
Temperature
Non-operating high temperature
Non-operating low temperature
Operating high temperature
Operating low temperature
Temperature Variation
Altitude
Decompression
Overpressure
Humidity
Operational Shock and Crash safety
Vibration
Magnetic Effect
Power Input
Voltage Spike
Radio Frequency Emission
Electrostatic Discharge
POWER REQUIREMENTS
Power - 14 VDC Models
Power - 28 VDC models
Dissipation (nominal)
14 and 28 vdc models
Dissipation (maximum)
14 vdc models (heater ON)
28 vdc models (heater ON)
Keep Alive circuit Power
3.35 in. X 2.25 in. X 1.50 in.
3.5 oz.
Passive
DO-160D, Category B1
(DO-160D Category B1)
+85 °C
-55 °C
+55 °C
-20 °C
DO-160D, Category B
(DO-160D, Category B1) 25,000 feet
DO-160D, Category B1
DO-160D, Category B1
(DO-160D Category A) 95percent
DO-160D Category B
DO-160D: Category S, Curve M
DO-160D, Category Z
DO-160D, Category B
DO-160D, Category B
DO-160D, Category B
DO-160D, Category A
+14 VDC (Nominal 9.0 vdc to 15.1 vdc)
+ 28 VDC (nominal 18.0 vdc to 30.3 vdc)
<1 watt
9 watts
10 watts
< 8 MA
TABLE 2 - Leading Particulars
4.0 oz.

CO Guardian LLC Document No. 03-452-201
1951 E. AIRPORT DRIVE Date: 8/20/2006
TUCSON, AZ. 85706 REV F
MODEL 452-201 OWNERS MANUAL Page 10 of 22
4.0 SCOPE
The Model 452-201 Series Carbon Monoxide Detectors are designed to detect, measure,
and provide a visual alert to the crew of Reciprocating Engine type aircraft before the
cockpit level of carbon monoxide (CO) reaches a critical level.
The installation consists of a single carbon monoxide detector indicator operating on
aircraft DC power. The aircraft supplied power and aircraft wiring is protected by a 2
ampere, resettable, trip free, type circuit breaker. The Carbon Monoxide Detector
recommended location is behind the existing aircraft instrument panel.
The CO Detector installation consists of the CO Detector, a Test/Reset button, and a
required amber ALERT annunciator light mounted on the cockpit instrument panel.
The carbon monoxide alarm level is calibrated to provide a visual alert within 5 minutes or
less whenever the carbon monoxide level reaches 50 parts per million (PPM) by volume
or greater per TSO C48A. The warning time is shortened at higher levels of CO
concentrations and becomes approximately instant should the carbon monoxide level
reach 400 parts per million by volume (PPM) or greater.
In case of a carbon monoxide alert, the pilot will receive an amber Alert annunciator light
that is mounted on the Pilot's instrument panel. The visual alert will remain until the
carbon monoxide level is reduced below the alert level. The indicator is automatically
reset when the CO level drops below 50 PPM. There is a three-minute delay in the -001
through -010 part number units at startup to stabilize the sensor before the unit will
accurately sense CO levels.
5.0 SERVICE FACILITIES
With the exception of the Model 452-201-* CO Detectors, the operator can service all
other components of the installation at an FAA certified Repair Station. CO Detectors
must me returned to CO Guardian for repair or overhaul.
NOTE
The sensor requires special gases for testing and calibration. If any discrepancies
are found with the unit during installation or during the operational service life, the
unit must be returned to CO Guardian for repair or replacement. The CO Detector
unit must be returned to the manufacturer for CO sensor replacement and re-
calibration at the end of the service life applicable to the units part number.
-011

CO Guardian LLC Document No. 03-452-201
1951 E. AIRPORT DRIVE Date: 8/20/2006
TUCSON, AZ. 85706 REV F
MODEL 452-201 OWNERS MANUAL Page 11 of 22
6.0 INSTALLATION
The following documents the installation criteria of the Model 452-201 Remote Carbon
Monoxide Detector Installation:
a. Choose a location behind the instrument panel for the installation of the CO Detector.
Choose a location with space available that also meets the following criteria. A typical
installation is shown in drawing 01-2510-02 rev. C or later. The unit can be installed on
any side of the instrument panel.
b. Insure that the area around the CO Detector panel location will permit unrestricted airflow
through the unit.
c. Install in a cockpit area not exposed to excessively dusty or dirty conditions.
d. Insure that the air intake on the front of the CO Detector is not obstructed in any manner.
e. Install the CO Detector in a location without high or disturbed airflow movement. The CO
Detector will detect the presence of CO more effectively if the unit does not have air
blowing over it.
f. Insure that the CO Detector installation area meets the temperature and humidity ranges
listed in the List of Particulars specifications. Temperature and humidity conditions
outside the specification may affect the sensitivity of the detector.
g. Install the TEST/RESET and the amber ALERT annunciator in a location within the pilot's
direct field of vision and within normal pilot's reach. Note: see MFG MFD installation
manual if TEST/RESET and the amber ALERT annunicator unit will not be installed and
the data will be displayed thru the RS232 interface with MFD.
h. The unit can be remotely installed behind the instrument panel up to six inches from the
panel air sampling holes. Verify there are no bends that may obstruct air flow to the unit.

CO Guardian LLC Document No. 03-452-201
1951 E. AIRPORT DRIVE Date: 8/20/2006
TUCSON, AZ. 85706 REV F
MODEL 452-201 OWNERS MANUAL Page 12 of 22
6.1 RECOMMENDED INSTALLATION AREAS
•Typical installation areas are depicted below in Figurers 1 and 2.
FIGURE 1 - TYPICAL RIGHT HAND INSTRUMENT PANEL SHOWN
FIGURE 2 - TYPICAL PILOT INSTALLATION SHOWN
CO Detector
Amber Alert
Annunciator
Test /Reset
Switch
2 AMP CIRCUIT
BREAKER

CO Guardian LLC Document No. 03-452-201
1951 E. AIRPORT DRIVE Date: 8/20/2006
TUCSON, AZ. 85706 REV F
MODEL 452-201 OWNERS MANUAL Page 13 of 22
6.2 INSTALLATION INSTRUCTIONS
6.2.1 INSTALLATION INSTRUCTIONS (PART NUMBERS 452-201-001 through -004)
a. Install the CO Detector in accordance with drawing 01-2510 Rev. C or later.
Note the 'salt-shaker' and 'open' air intake hole pattern option on drawing. Placards above
and below the air intake hole/s/, in accordance with Flag Note 11, as shown drawing.
b. Install the CO Detect 2 amp circuit breaker in accordance with drawing Section A-A and
D-D. It is recommended that the circuit breaker be installed on the Essential or Avionics
Buss that is not subject to emergency electrical load shedding. Placard or engrave the
circuit breaker as CO DETECT in accordance with drawing, Flag Note 11.
c. Install the remote Amber Alert annunciator on the L/H instrument panel in accordance with
drawing Section C-C. Placard or engrave the Amber Alert annunciator as CO ALERT in
accordance with Flag Note 11.
d. Install the CO Alert momentary Test/Reset switch on the L/H instrument panel in
accordance with drawing 01-2510-02 Section C-C. Placard or engrave the TEST/RESET
switch as CO TEST/RESET in accordance with drawing Flag Note 11.
e. Wire the CO Detector installation in accordance with applicable drawing wiring diagram.
452-201-001 through 452-201-004
PIN FUNCTION
1 14 or 28 VDC Power Input
2 Power Ground
3 CO Alert Relay-Wiper Contact A
4 CO Alert Relay -NO Contact A
5 CO Alert Relay-Wiper Contact B
6 CO Alert Relay -NO Contact B
7 Remote Test/Reset Switch
8 Remote Test/Reset Switch
CO DETECTOR CONNECTOR PINS AND FUNCTION
Observe the following items:
Twist the power and ground return wires together approximately 6 turns per foot in
accordance with drawing 01-2510-02 Note 7.
Connect Pin 1 to +14 VDC or to +28 VDC power as applicable to the installation
aircraft and the CO Detector voltage rating.
Ground power return wire (Pin 2) to suitable aircraft structure ground near circuit
breaker panel.

CO Guardian LLC Document No. 03-452-201
1951 E. AIRPORT DRIVE Date: 8/20/2006
TUCSON, AZ. 85706 REV F
MODEL 452-201 OWNERS MANUAL Page 14 of 22
6.2.2 INSTALLATION CHECKS (PART NUMBERS 452-201-001 through -004)
a. With the CO Detector disconnected from the aircraft harness, conduct a continuity
check of the added aircraft wiring.
b. Turn ON the aircraft Battery Switch. Close the CO DETECT circuit breaker and
measure aircraft voltage between pins 1 and 2 of the CO Detector connector. Pull the
CO DETECT circuit breaker. Verify the voltage between pins 1 and 2 is OFF.
c. Connect the CO Detector connector to the aircraft harness. Turn aircraft Battery
Switch ON. Close CO DETECT circuit breaker.
d. Operational check the unit by depressing the CO TEST/RESET switch and verifying
the remote alert light operation. Remote Amber Alert light should flash twice.
e. Verify the unit can be shut off with the CO DETECT circuit breaker.
f. Determine the moment arm for the installed CO Detector location and record in aircraft
weight and balance manual. CO Detector weight is 3.5 oz.
6.2.3 INSTALLATION INSTRUCTIONS (PART NUMBERS 452-201-005 through -010)
a. Install the CO Detector in accordance with drawing, Section B-B, Section E-E, and
Section F-F.
Note the 'salt-shaker' and 'open' air intake hole pattern option in drawing , Section E-E.
Install placards above and below the air intake hole/s/, in accordance with Flag Note 11,
as shown in drawing Section B-B.
b. Install the CO Detect 2 amp circuit breaker in accordance with drawing, Section A-A and
D-D. It is recommended that the circuit breaker be installed on the Essential or Avionics
Buss that is not subject to emergency electrical load shedding. Placard or engrave the
circuit breaker as CO DETECT in accordance with drawing, Flag Note 11 and drawing,
Section A-A. Pull and open the circuit breaker.
c. Install the remote Amber Alert annunciator on the L/H instrument panel in accordance with
drawing 5 Section C-C. Placard or engrave the Amber Alert annunciator as CO ALERT in
accordance with drawing, Flag Note 11. NOTE 11. Remote light not required if “Alert
Light” is shown on Multi Function Display. See MFG installation Manual.
4.0 oz.
6.2.3 INSTALLATION INSTRUCTIONS (PART NUMBERS 452-201-005 through -011)

CO Guardian LLC Document No. 03-452-201
1951 E. AIRPORT DRIVE Date: 8/20/2006
TUCSON, AZ. 85706 REV F
MODEL 452-201 OWNERS MANUAL Page 15 of 22
d. Install the CO Alert momentary Test/Reset switch on the L/H instrument panel in
accordance with drawing, Section C-C. Placard or engrave the TEST/RESET switch as
CO TEST/RESET in accordance with drawing, Flag Note 11. Remote reset is not required
if remote reset is capable by Multi Function Display. See MFG installation Manual.
e. Wire the CO Detector installation in accordance with applicable drawing wiring diagram.
452-201-005 through 452-201-010
PIN FUNCTION
1 14 or 28 VDC Power Input
2 Remote Test/Reset Switch
3 Remote Test/Reset Switch/Ground for
RS232 Displays
4 CO Alert Relay –Goes to Ground
5 Power Ground
6 Not Used
7 RS-232 TX Output
8 RS-232 RX Input
9 Pressure Relay -Goes to Ground
CO DETECTOR CONNECTOR PINS AND FUNCTION
6.2.4 INSTALLATION CHECKS
a. With the CO Detector disconnected from the aircraft harness, conduct a continuity
check of the added aircraft wiring.
b. Turn ON the aircraft Battery Switch. Close the CO DETECT circuit breaker and
measure aircraft voltage between pins 1 and 5 of the CO Detector connector. Pull the
CO DETECT circuit breaker. Verify the voltage between pins 1 and 5 is OFF.
c. Close the CO DETECT KEEP ALIVE circuit breaker and measure aircraft voltage
between pins 9 and 5 of the CO Detector connector. Turn aircraft Battery switch OFF.
Measure aircraft voltage between pins 9 and 5 of the CO Detector connector. Pull the
CO DETECT KEEP ALIVE circuit breaker. Verify the voltage between pins 9 and 5 is
OFF.
d. Connect the CO Detector connector to the aircraft harness. Turn aircraft Battery
Switch ON. Close CO DETECT circuit breaker.
e. Operational check the unit by depressing the CO Test/Reset switch and verifying the
remote alert light operation. Remote Amber Alert light should flash twice.
452-201-005 through 452-201-011

CO Guardian LLC Document No. 03-452-201
1951 E. AIRPORT DRIVE Date: 8/20/2006
TUCSON, AZ. 85706 REV F
MODEL 452-201 OWNERS MANUAL Page 16 of 22
f. Verify the unit can be shut off with the CO DETECT circuit breaker.
g. Determine the moment arm for the installed CO Detector location and record in aircraft
weight and balance manual. CO Detector weight is 3.5 oz.
7.0 MAINTENANCE INSTRUCTIONS
The carbon monoxide detector and associated equipment consist of certain parts, which
do not require periodic scheduled servicing or periodic scheduled preventive
maintenance. At every power up the system will go through a self-diagnostic check.
WARNING: If the Model 452-201 unit shows a flashing remote Amber light every 4
seconds, return the unit to CO Guardian for repair or replacement. See MFG
Manual if Remote light is displayed on the MFD.
Field repair or service is allowable on all of the installed system components
except for the CO Detector Indicator itself. The CO Detector must be returned to CO
Guardian, LLC for all service.
The aircraft wiring harness, circuit breaker, Alert annunciator, and Test/Reset switch shall
be included maintenance instructions for general visual inspections for system integrity,
installation security, corrosion and chaffing.
4.0 oz

CO Guardian LLC Document No. 03-452-201
1951 E. AIRPORT DRIVE Date: 8/20/2006
TUCSON, AZ. 85706 REV F
MODEL 452-201 OWNERS MANUAL Page 17 of 22
8.0 CARBON MONOXIDE DETECTOR SCHEDULED MAINTENANCE
Scheduled Maintenance Program tasks to be added to the aircraft operator's appropriate
airplane maintenance program are as follows:
MAINTENANCE TASK INTERVAL
a. Recommended Periodic Scheduled Servicing Tasks: None Required.
b. Recommended Periodic Scheduled Preventative
Maintenance test/checks to determine system condition
and/or latent failures:
Note:
Be sure the vent on the faceplate is free of obstructions.
Any failures of the system are evident to the pilot
through a flashing remote Amber light approximately
every 4 seconds.
Each time the unit is turned ON.
c. Recommended Periodic Inspections: None Required.
d. Recommended Periodic Structural Inspections None Required.
e. Required CO Sensor replacement and calibration.
A
t end of Service Life (Reference Par. 2.0)
NOTE
The unit must be returned to the manufacturer for sensor
replacement and recalibration at the end of the unit service life.
NO FIELD SERVICE OR OVERHAUL OF MODEL 452 IS AUTHORIZED.
9.0 WEIGHT AND BALANCE / EQUIPMENT LIST
The Aero 452-201 CO Detector installation weighs 0.109 lbs. Reference the aircraft
weight and balance manual for moment arm.

CO Guardian LLC Document No. 03-452-201
1951 E. AIRPORT DRIVE Date: 8/20/2006
TUCSON, AZ. 85706 REV F
MODEL 452-201 OWNERS MANUAL Page 18 of 22
10.0 LIMITATIONS
The Aero 452-201 CO Detector may not replace any existing instrument or indicator
required by the type design or operating limits.
11.0 NORMAL PROCEDURES
When the airplane master battery switch is selected ON, the Aero 452-201 Remote CO
Detector goes through a self-test routine. The self-test checks for functionality of critical
components such as the CO sensor, temperature sensor, pressure sensor, and integrity
of the system.
10.1 SELF TEST SEQUENCE
You will notice the following test sequence:
•The Amber CO ALERT light will flash twice and then remain OFF until there is a CO
ALERT, a failure of the unit, or another self-test is performed.
A self-test can be performed when desired by depressing the TEST/RESET button.
12.0 PERFORMANCE
No Change

CO Guardian LLC Document No. 03-452-201
1951 E. AIRPORT DRIVE Date: 8/20/2006
TUCSON, AZ. 85706 REV F
MODEL 452-201 OWNERS MANUAL Page 19 of 22
13.0 EMERGENCY PROCEDURES
If the CO Detector ALERT annunciator activates in flight, press the TEST/RESET button
to reset the alert annunciator. If the ALERT light continues to illuminate:
•Shut off the heater, air conditioning or any other opening to the engine compartment.
•Open a fresh air source immediately.
•Don't smoke.
•Use 100% oxygen, if possible.
•Land as soon as conditions permit.
•Be sure the source of the contamination is corrected before further flight.
NOTE: The remote Amber light will stay on until the CO level goes below 50 parts
per million (PPM) by volume of carbon monoxide concentration. SEE MFD manual
if the “ALERT” display is integrated with the Manufacturers MFD.
DO not recycle the unit through the circuit breaker. A three-minute delay is required
for the CO sensor to stabilize after each power-up in the -001 through -004 P/N
units.

CO Guardian LLC Document No. 03-452-201
1951 E. AIRPORT DRIVE Date: 8/20/2006
TUCSON, AZ. 85706 REV F
MODEL 452-201 OWNERS MANUAL Page 20 of 22
14.0 UNIT FAILURE INDICATION:
A failure of the CO Sensor, Temperature Sensor, or the Micro-controller will result in the
following failure indications:
•The remote Amber light will flash at an approximate rate of one flash each four (4)
seconds until the failure is cleared or power is removed from the unit. NOTE: SEE
MFG manual if the fault data is integrated with the MFG MFD for fault analysis.
In case of a failure indication, attempt to clear the failure condition by resetting the CO
Detector. Should the failure condition continue, remove the CO Detector power by pulling
the CO Detector circuit breaker.
15.0 RS-232 DATA BUSS OPTION
The RS-232 Data Buss option is currently available on numerous MFD units like the
Garmin GNS480 and Garmin G1000. The RS-232 data buss output will couple CO
Detector status information to electronic display systems with RS-232 input capability.
The unit transmits CO Level, Cabin Temperature, Cabin pressure and is remotely reset
able via RS232.
See Multi-Function display manufacturers Installation Manual for interface guidance.