16
Selecting Fan Relay Latching Option – “FrL”
To select the
Fan Relay Latching Option
, in normal mode, push the
Next
button to get to “Con” or the Configuration menu. Then push
the
Enter
button to enter the Con menu.
The tenth selection
is the “FrL” or Fan Relay Latching Option. Push
Next
nine times to get to
“FrL” then
Enter
. If latching is “OFF” push
Next
to turn it to “ON” (flashing) then push
Enter
to confirm the change (solid) and push
Enter
again to return to “FrL” in the Con menu. Push
Next
until “End” is displayed then push
Enter
to get back to normal operation.
Selecting Trouble Fan Setting Option – “tFS”
To select the
Trouble Fan Setting Option
, in normal mode, push the
Next
button to get to “Con” or the Configuration menu. Then
push the
Enter
button to enter the Con menu.
The eleventh selection
is the “tFS” or Trouble Fan Setting Option. Push
Next
ten times
to get to “tFS” then
Enter
. If Trouble Fan Setting is “OFF” push
Next
to turn it to “ON” (flashing) then push
Enter
to confirm the change
(solid) and push
Enter
again to return to “tFS” in the Con menu. Push
Next
until “End” is displayed then push
Enter
to get back to
normal operation.
Selecting 4-20mA Output Option – “420”
To select the
4-20mA Output Option
, in normal mode, push the
Next
button to get to “Con” or the Configuration menu. Then push the
Enter
button to enter the Con menu.
The twelfth selection
is the “420” or 4-20mA Output Option. Push
Next
eleven times to get to
“420” then
Enter
. If the 4-20mA is “On” push
Next
to turn it to “OFF” (flashing) then push
Enter
to confirm the change (solid) and push
Enter
again to return to “420” in the Con menu. Push
Next
until “End” is displayed then push
Enter
to get back to normal operation.
Onboard Diagnostics
The CD-12 monitors all critical functions of the unit through software diagnostics that continuously test and verify unit operations. If a
problem is found, the unit will switch to a fail-safe/error mode or trouble condition. In this error mode, the Alarm relay will be activated,
the 4-20 mA current loop will go to 24 mA, the unit will display the error code, the green status indicator LED light will flash and the
buzzer will chirp intermittently. The Fan relay will also engage if the Trouble Fan Setting Option is set to “ON”. This is a safety
precaution. To clear this mode, simply turn off power to the unit for a few seconds, or push the ENTER/TEST switch (inside the unit).
This will cause the unit to restart the 1 minute self-test cycle.
The 4-20 mA signal can be used for troubleshooting:
0 mA is most likely a connection problem
4-20 mA is normal gas reading range (0-2000 ppm)
24 mA indicates a Trouble condition
