3M Macurco CM-21A User manual

Macurco™ CM-21A Carbon Monoxide
Detector and Controller
User Instructions for 3M Macurco CM-21A - Low voltage, dual relay Carbon
Monoxide (CO) detector and controller
Important: Keep these User Instructions for reference
1

08/00
Carbon Monoxide Detector and Controller
CM-21A
Low maintenance, no periodic calibration needed
SPDT fan relay switches 5 amps
Automatic ventilation controller
Dual relays: fan (SPDT) & alarm (N.O.)
Lights reflect system status
Micro computer controlled
Long life (7 to 10 years) Solid state sensor
•• CM-21A is very specific to carbon monoxide (CO), avoids nuisance alarms.
•CM-21A provides CO detection and automatic exhaust fan control for automotive
maintenance facilities, enclosed parking garages, warehouses with forklifts, etc.
•CM-21A meets the requirements of the Uniform Building Code for enclosed garages.
•CM-21A Meets or exceeds UL 2034 standard and OSHA standards for CO exposure.
•Fan relay activates at 35 ppm of CO averaged over 5 minutes. 25 ppm is selectable.
•Alarm relay activates at 100 ppm of CO after 30 minutes or 200 ppm after 10 minutes.
•5 amp SPDT fan relay controls starters of exhaust fans.
•1/2 amp N.O. alarm relay connects to warning devices or control panels.
•CM-21A mounts on a standard 4x4 electrical box and becomes cover for the box.
•Supervised system: any internal detector problem will cause the fan relay to activate.
•Optional calibration kit is available. One screw allows access for calibration.
Specifications:
Power: 3 watts from 12 to 24 VAC or VDC
Current: 12 V -0.25 amps, 24 V -0.12 amps
Shipping Weight: 1 pound
Size: 4 1/2 x 4 x 2 1/8 in.
Color: gray
Connections: 7 each #20 wires, 6 inches long
Mounting box: (not included) 4x4 electric
Fan relay: 5 amp, 240 VAC, pilot duty, SPDT
Fan relay actuation: 35 or 25 ppm CO after 5 min.
Alarm relay: 0.5 amp 200 V, 10 VA
Alarm relay actuation: 100 ppm CO after 30 min.
200 ppm CO after 10
min.
Operating Environ: 0 to 125 F, 10 to 90 % RH
Repeatability: ±10% at 50 ppm calibration point
Linearity: ±10%
Carbon monoxide exposure: ppm CO vs time
200 ppm
CO 100 ppm CO 50 ppm CO 35 ppm CO1
CM-21A
Fan Relay 5 min. 5 min. 5 min. 5 min.
CM-21A
Alarm Relay 10 min. 30 min. none none
UL 2034 Std. 35 min. 90 min. no std. no std.
OSHA Std. no std. no std. 8 hr TWA no std.
UBC Std. 60 min. no std. 8 hr TWA no std.
1. This response is jumper-selectable at 25 ppm; see
CM-21A Operating and Installation Instructions.
Manufactured By: Distributed By:

coil
Power
to remote 24vac alarm
transformer
24 vac
Main
fan power
Relay
24 vac coil
exhaust fan
CM-21A
Exhaust fan
air inlet
door, louver
damper
mount centrally
Typical layout in
small garage
(transformer
Controls
Typical Installation in small garage
red red
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blue
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POWER
12/24V
ALARM RELAY
SPDT fan RELAY
CM-21A
red red
yel.
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blue
brn.
org.
POWER
12/24V
ALARM RELAY
SPDT fan RELAY
CM-21A
red red
yel.
yel .
blue
brn.
org.
POWER
12/24V
ALARM RELAY
SPDT fan RELAY
CM-21A
red red
yel.
yel .
blue
brn.
org.
POWER
12/24V
ALARM RELAY
SPDT fan RELAY
CM-21A
coil
POWER
MAIN FAN
POWER
Relay
24 vac
coil
24 vac
remote alarm
exhaust fans
24 VAC
Transformer Air Inlet
door, damper
louver
Air Inlet
door, damper
louver
CM-21A
CM-21ACM-21A
exhaust fan
exhaust fan
controls
relay &
transformer
Typical layout in parking garage
INSTALLATION NOTES
1. One sensor per 5000 square feet (approximately).
2. Mount CM-21A four to five feet above the floor.
3. See applicable building code for fan size vs air
changes per periods of time.
4. Make sure there are air inlets to provide
adequate air flow throughout the building.
Typical multiple CM-21A installation
space sensors equally
& relay)
red red
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blue
brn.
org.
POWER
12/24V
ALARM RELAY
SPDT fan RELAY
CM-21A
coil
MAIN FAN
POWER
exhaust fan
RELAY
12 or 24
vdc coil
Alarm Control Panel
12 or 24 vdc power battery backed up N.O. (fire) initiating circuit auxiliary functions such as dialers.
Typical Connection to Alarm Control Panel
1. CM-21A can be used with 12vdc or
24vdc N.O. (fire) panels.
2. Alarm panel provides battery
backed up power to CM-21A.
3. CM-21A dry contact fan relay can
use panel power or fan power: check
ratings.
4. Match fan relay contacts to fan
size, and coil voltage to power source.
5. Alarm Control Panels are available with many
features & can control other devices such as smoke
detectors, fire detectors & burglar alarms.
(starter)
6. Several fan relays (starters) may be
used. Match the relays to the fan size.
5. CM-21A fan relays are dry contact &
can switch up to 240V: see ratings,
over.

CARBON MONOXIDE SENSORS
KCO SERIES
GAS & SPECIALTY SENSORS
2008 KELE CATALOG • www.kele.com • USA 888-397-5353 • International 901-382-6084 195
GAS & SPECIALTY SENSORS
DESCRIPTION
KCO Series Carbon Monoxide Sensors are available
in analog or relay versions. The sensors are provided in
heavy-duty steel enclosures, and the sensors use low-
temperature components that are ideal for open parking
garages in cold climates.
FEATURES
• Two-stage alarming (KCO-R)
• 0-200 ppm 4-20 mA output (KCO-A)
• Microprocessor-controlled recalibration (KCO-A)
• Heavy-duty enclosures
• Operating temperature down to -4°F (-20°C)
• Low-temperature option available -20°F (-29°C)
• Temperature and humidity compensated
KCO-R
The KCO-R is a two-stage carbon monoxide sensor with a relay output for each stage. If the CO level rises above
the warning stage setpoint for over 30 seconds, the warning relay, amber warning LED, and a three-minute mini-
mum “on” timer will activate. Once below the setpoint, the relay and LED will reset. If the concentration continues to
rise and exceeds the alarm stage setpoint for 10 minutes, the alarm stage relay and red LED will activate.
Calibration of the unit requires the application of a hydrated test gas.
KCO-A
The KCO-A is a microprocessor-controlled sensor with a 4-20 mA analog output based on a 0-200 ppm sensing
range. The microprocessor controls the heating of the sensor and subsequent reading of the CO level. The micro-
processor compensates for any drift in the sensor over time. The microprocessor system includes self-diagnostic,
self-restarting, and remote failure reporting. The output signal will drop below 4 mA if a fault is discovered. If power
problems cause the unit to malfunction, the unit will self-check and restart. Calibration of the unit requires the appli-
cation of a hydrated test gas, and the push of a button performs the recalibration.
INSTALLATION
Note: Front covers are blank
KCO-R
Power 24 VAC/VDC ±20%, 260 mA
Power with LT option 1.125A
Indicators
Amber Warning
Red Alarm
Flashing green/red Power on, microprocessor
operating
Warning stage delay 30 sec
Range 0-250 ppm
Response time Under 30 sec
Relay contacts 120 VAC, 2A resistive
Setpoints Warning 50 ppm, alarm 100
ppm (reset 5-10 ppm change)
KCO-A
Output signal 4-20 mA into 500Ωmax
Scale 0-200 ppm carbon monoxide
Power 24 VAC ±20%, 10 VA
Power with LT Option 34 VA
Analog resolution 12 bit
Reading delay 10 minutes
KCO-R, KCO-A
Operating temp -4° to 185°F (-20° to 85°C)
Sensor type Solid-state metal oxide
semiconductor
Humidity 5% to 95% noncondensing
Enclosure dimensions 6.25"H x 6.125"L x 3"D
(15.9 x 15.6 x 7.6 cm)
Accuracy ±5%
Sensor drift ±10% 2 years
Sensor life 10 years
Weight 3.0 lb (1.4 kg)
Warranty 18 months
SPECIFICATIONS
KCO-A-H
KCO-R-H

CARBON MONOXIDE SENSORS
KCO SERIES
GAS & SPECIALTY SENSORS
2008 KELE CATALOG • www.kele.com • USA 888-397-5353 • International 901-382-6084
196
GAS & SPECIALTY SENSORS
The KCO Series senses levels of CO for up to 5000 ft2(465m2) of coverage if there is normal air circulation within
the area. Mount on a wall or column approximately 5' (1.52m) above the floor. The sensors should not be mounted
in corners where airflow could be restricted.
INSTALLATION
ORDERING INFORMATION
KCO-R
Relay
R2
Relay
R1
T1
L1 (+)
24 VAC/DC
Alarm
Relay Factory setting 100 ppm
N.O.
N.C.
Warning
Relay Factory setting 50 ppm
N.O.
N.C.
T3
T2
L2(–)
KCO-A
24 VAC
4-20 mA SIG OUT
L1
L2
–
+
WIRING
50 ppm 50/100 ppm relay settings(KCO-R only)
R Relay output carbon monoxide sensor
MODEL
KCO DESCRIPTION
H Hinged-cover enclosure
KCO RH 50 ppm Example: KCO-RH-50 ppm Carbon monoxide sensor
with relay output and hinged cover enclosure.
A Analog output carbon monoxide sensor
LT Low-temperature option -20°F (-29°C)
CAUTION: Not for diesel fume applications.
Not to be used as a life-safety device.
RELATED PRODUCTS
UCK-1 Universal calibration kit for non-corrosive gases
(order gas separately)
GAS-CO-100 Calibration gas (100 ppm CO), 17L bottle
GAS-CO-50 Calibration gas (50 ppm CO), 17L bottle
GAS-CO-25 Calibration gas (25 ppm CO), 17L bottle