Macurco CX-6 User Instructions page 14

Macurco CX-xx Manual (Rev-1.0) Eng
6. 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.
7. The Fan Relay will engage if the fan setting Carbon Monoxide or Nitrogen 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 of these conditions have been met:
Carbon Monoxide and Nitrogen Dioxide concentrations have 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.
8. The Current Loop is 4 mA in clean air and 4-20 mA for 0-200ppm CO and 4-20 mA for 0-20ppm NO
are two terminals and polarity is marked on the connector.
NOTE: 22 to 12 AWG wire shall be used. Wire used shall meet the temperature range of the detector i.e. 0°F to 125°
F (-18°C to 52°C).
REV – 1.0
Figure 3–10 12-Series 4-20 mA CO Output diagram
[34-2900-0512-0 ]
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