12-Series Line Voltage - Macurco GD-6 Operation Manual

Macurco GD-xx 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.
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 Combustible Gas 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:
• Combustible Gas 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 0-50% LEL
REV – 2.0.0
Figure 3-9 – 12-Series 4-20 mA Output
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