Macurco RD-6 Instructions D'utilisation page 8

6. 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.
7. 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.
8. 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.
9. The Fan Relay will engage if the fan setting refrigerant 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:

Refrigerant 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.
10. The Current Loop is 4 mA in clean air and 20 mA for 1,000 ppm refrigerant gas
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