Removing The Methanizer/Air Cleanup Assembly - ABB PGC2000 Operation And Service Manual

Refer to Figure 8-16 for Methanizer/Air Cleanup Assembly component location.

Removing the Methanizer/Air Cleanup Assembly

1. Remove power from the analyzer.
2. Turn off oven air to the isothermal oven and allow all temperature zones to cool.
3. Turn off air supply to air cleanup unit.
4. Open the isothermal oven door.
5. Label the tubing on both sides of the associated unions with temporary numbered tape labels.
The labels are later used to ensure correct tubing connections when the air cleanup/methanizer is
reinstalled.
4 2 1
TYPE 781
6. Using 7/16-inch and 5/16-inch open-end wrenches, disconnect the tubing connections from the
reducing unions.
7. Disconnect any retaining clamps that are securing the harness.
8. Remove the four Phillips head screws attaching the support brackets to the isothermal oven wall.
Secure the unit with your hand while removing the final top screws.
9. Lay the Methanizer/Air Cleanup Assembly on a suitable work surface within the constrained
length of the heater harness. If only the catalytic tubes are to be replaced, the harness will not
require further disconnection.
10. Type 781 only: Remove the four Phillips head screws attaching the support bracket to the top
unit end caps and lay them aside.
2000-OSM, F1
Harness Assy
3
Figure 8-16. METHANIZER/AIR CLEANUP ASSEMBLY
Air Cleanup
Tube
Methanizer
Tube
3 1 2 4
TYPE 805
8-35