Macurco CM-6 — low voltage carbon monoxide detector, controller and transducer with fan and alarm relays and a 4-20 mA loop.
CM-6 is one model, the low voltage member of the Macurco 6/12 Series; CM-12 is the line voltage version. Mounted as the cover of a 4x4 electrical box, it reads CO on a non-replaceable electrochemical sensor and switches exhaust fans directly, so a parking garage or boiler room ventilates on demand rather than continuously. The 4-20 mA loop also feeds control panels.
- 3 W max from 12 to 24 VAC or 12 to 32 VDC; at 24 VDC, 23 mA standby and 75 mA in alarm
- Fan relay 5 A, 240 VAC pilot duty SPDT; 15, 25, 35 (default), 50 or 100 ppm
- Alarm relay 0.5 A, 120 V, 60 VA, N.O. or N.C.; 50, 100, 150 or 200 ppm (default)
- 3-digit LED display and 85 dBA buzzer, both off by default; 0 to 200 ppm
- Supervised: any internal fault drives both relays; end-of-life signal at ten years
- 0°F to 125°F; 4 1/2 × 4 × 2 1/8 in
- ETL certified, CSA C22.2 No. 61010-1, UL 61010-1, UL 2075
CM-12 is the 100-240 VAC sibling and CM-E1 a separate CO monitor. The 4x4 box is not included.
FAQ
Is a mounting box included?
No. The CM-6 mounts on a standard 4 in. square (4x4) electrical box supplied by the contractor and becomes the cover for the box.
What is the difference between CM-6 and CM-12?
The CM-6 is the low voltage model (12 to 24 VAC or 12 to 32 VDC); the CM-12 is the line voltage model (100 to 240 VAC).
What CO levels trigger the fan relay?
The fan relay is selectable at 15, 25, 35 (default), 50 or 100 ppm, or can be disabled.
Where should it be mounted?
Normally at breathing level, about 5 ft above the floor, on a wall or column in a central area with good air movement; one unit covers roughly 5,000 to 7,500 sq ft.
