Macurco GD Operation Manual
3.2.2 12-Series Line Voltage
1. The GD-12 mounts on a 4" square (or 4x4) electrical box supplied by the contractor. Do not mount the GD-
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.
REV – 1.0.0
Figure 3-8 – 6-Series Alarm Panel and Shutoff Valve Wiring
Figure 3-9 – 6-Series Horn & Strobe Combo Wiring
[34-2900-0027-6 ]
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