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Macurco CD-xx H/MC Manual
3.2.2 12-Series Line Voltage
1. The CD-12H/MC mounts on a 4" square (or 4x4) electrical box supplied by the contractor. Do not mount the CD-
12H/MC inside another box, unless it has good air flow through it.
2. Connect the CD-12H/MC to the control cables with terminal plugs. When making connections, make sure the power is
de-energized.
3. There are two terminals for Power: 100-240VAC (50 – 60 HZ)
4. 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 section
Default – Factory Settings
5. 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.
6. 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 section
these User Instructions for details on relay settings.
7. The Fan Relay can be configured for latching or non-latching (default) when activated (when the gas concentration
exceeds fan relay setpoint). Once latched in, power will need to be interrupted or the "TEST" button pressed to un-
latch the relay condition.
8. The Fan Relay will engage if the fan setting Carbon Dioxide concentration is exceeded for longer than the Fan Relay
Delay time. Unless it is configured for latching, the fan relay will disengage once both conditions have been met:
•
Carbon Dioxide concentration has dropped below fan setting
•
Fan Relay Runtime 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.
9. The Current Loop is 4 mA in clean air and 4-20 mA for 0-5000 ppm CO
REV – 1.1
Figure 3-8 6-Series Horn & Strobe Combo Wiring
of these User Instructions for details on relay settings.
31T
[34-2900-0510-8]
4.5 Default – Factory Settings
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