16 • 65-2405RK-05-04 Combustible Gas Transmitter
Replacing Components of the Combustible Gas Transmitter
This section includes procedures to replace the combustible gas detector and amplifier.
Replacing the Combustible Gas Detector
NOTE:
The combustible gas detector is installed on the junction box that does not house the
amplifier. This junction box was likely installed somewhere difficult to access.
1. Turn off the controller.
2. Turn off or unplug power to the controller.
3. Unscrew the calibration cup/splash guard from the detector.
4. Remove the detector junction box’s cover.
5. Disconnect the detector leads from the terminal block in the detector junction box. Note the
position of the color-coded leads as you remove them.
6. Unscrew the detector from the detector junction box.
7. Guide the detector leads of the replacement detector through the bottom conduit hub of the
detector junction box, then screw the mounting threads of the detector into the conduit hub. If
necessary for environmental conditions, apply thread sealant or Teflon tape to the hub and/or
detector threads to seal them.
8. Connect the detector leads to the terminal block the same way the old detector was wired (see
9. Screw the calibration cup/splash guard onto the new detector.
10. Reinstall the detector junction box’s cover.
11. Turn on or plug in power to the controller.
12. Turn on the controller and place it into normal operation.
CAUTION:
Allow the replacement detector to warm up for 5 minutes
before you continue with the
next step.
13. Calibrate the transmitter as described in “Calibration” on page 19 of this manual.
Replacing the Amplifier
1. Turn off the controller.
2. Turn off or unplug power to the controller.
3. Remove the amplifier junction box’s cover.
4. Unplug the detector terminal strip and controller terminal strip from their sockets. You may leave
the wires connected to the terminal strips.
5. Unscrew and remove the screw with the flat and lock washers that secures the amplifier to the
junction box.
6. Remove the old amplifier.
7. Place the new amplifier in the same position as the old amplifier. A foam gasket that orients the
amplifier and keeps it from rotating is installed on the bottom of the amplifier. Make sure the
amplifier is seated flat in the junction box.
