Section 8. Repair; Replacing Heaters; Isothermal Temperature Oven Heater - ABB PGC2000 Operation And Service Manual

REPLACING HEATERS

Refer to Figure 8-1 for component location when replacing heaters.
Thermocouple
It is the customer's responsibility to ensure that the area is safe and and hazard-
free, and will remain so the entire time the analyzer is open. This responsibility
includes ensuring adequate ventilation in analyzer shelter and obtaining proper
work permits, etc.
See "AIR PURGING" in Section 4 for the X Purge override function. Do not perform
override until you have read Section 4 completely and you understand and can
perform the procedure properly.

Isothermal Temperature Oven Heater

1. Open the Controller front and side doors and the isothermal oven door.
2. On the Zone 1 PCB in the Digital Temperature Controller, disconnect J49B and remove the
isothermal oven heater wires from pins 1 and 2.
3. On the Zone 1 PCB, disconnect J49A and remove the thermocouple wires from pins 1 and 2.
4. On the DTC Backplane PCB disconnect J42A and remove the thermocouple wires from pins 1
and 2.
5. Connect a small feeder wire (at least 36 inches long) to one of the heater wires.
6. In the isothermal oven disconnect the 1/4-inch fitting from the heater.
7. Extract the heater assembly from the clamp.
8. Withdraw the heater and wires from the feedthrough grommet and into the oven.
2000-OSM, F1

SECTION 8. REPAIR

Temperature
Sensor
Methanizer
Oven
Heater
Column
Figure 8-1. ANALYZER OVEN COMPARTMENT
CAUTION
Detector
Liquid Sample
Valve
8-1