Page 1
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...
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 •...
Typical Installation in small garage Typical layout in Exhaust fan Power CM-21A Relay small garage 24 vac coil exhaust fan Controls (transformer & relay) transformer 24 vac CM-21A mount centrally Main fan power air inlet door, louver damper to remote 24vac alarm Typical multiple CM-21A installation INSTALLATION NOTES 1.
Page 4
GAS & SPECIALTY SENSORS CARBON MONOXIDE SENSORS KCO SERIES 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.
GAS & SPECIALTY SENSORS CARBON MONOXIDE SENSORS KCO SERIES INSTALLATION The KCO Series senses levels of CO for up to 5000 ft (465m ) 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.