Installation - Macurco CM-12 User Instructions

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.
4-20mA 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.
NOTE: The 4-20mA current loop outputs may be used with the Macurco DVP-120 control panel or other systems. The 4-20mA signal
connections to detectors should be size AWG18 (minimum) for short runs. Refer to the table for recommended wire gauges. Do not
bundle detector 4-20mA signal connections with AC power cables to prevent electrical interference. If AC power connections must be
bundled with the detector 4-20mA signal cables, the signal connections should be made with twisted pair of the appropriate gauge, with
an overall foil and braid shield. All shields should be terminated at the DVP-120 end of the cable only. A ground stud is provided near
the bottom left corner of the DVP-120 panel.

Installation

1. The CM-12 mounts on a 4" square (or 4x4) electrical box supplied by the contractor. Do not mount the CM-12 inside another
box, unless it has good air flow through it.
2. 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 OPERATION section of
these User Instructions for details on relay settings.
3. The alarm relay can be configured to normally open (default) (N.O.) or normally closed (N.C.) and will activate if the gas
concentration exceeds alarm set point. It will deactivate once the gas concentration drops below the alarm set point. Note that
the "disable" setting will cause the alarm relay not to engage at all.
4. 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 OPERATION section of these User Instructions for
details on relay settings.
5. 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.
6. The Fan Relay will engage if the fan setting Carbon Monoxide 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 concentration has 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.
7. The Current Loop is 4 mA in clean air and 4-20 mA for 0-200ppm CO
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