Installing A New Control Pcb; Removing The Heater - ABB PGC2000 Operation And Service Manual

3. Remove the ten screws holding the EPC Control Assembly cover using ABB Tool
TL1009 and remove the cover. Be careful not to damage the flame-proof or explosion-
proof surfaces of the cover or the body of the Control Assembly.
4. Unplug the large ribbon cable from the Control PCB and fold it back to the left and out of
the way (see Figure 8-22).
5. Unplug all valve, sensor PCB, and heater cables.
6. Using 2.5 mm hex socket wrench ABB Tool TL1007, remove four screws and washers
(two from the triacs and two from the PCB mounting brackets).
7. Pull the Control PCB straight out of the enclosure toward you.
8. Remove fish paper isolator (do not throw away).
9. With a clean cloth, clean thermal joint compound off the enclosure.

Installing a New Control PCB

1. On the new Control PCB, place a thin layer of thermal joint compound on all sides and
the bottom of each RTD, and on the back of each triac.
2. Insert the Control PCB into enclosure with components and connectors facing up.
3. Align RTDs with the holes in the enclosure and ensure the RTDs are inserted in the holes
flush with the enclosure.
4. Using 2.5 mm hex socket wrench ABB Tool TL1007, attach the Control PCB to the
enclosure with four screws and washers.
5. Insert the fish paper insulator between the enclosure and the back side (solder side) of
the Control PCB.
6. Plug all cables back into their corresponding connectors on the Control PCB.
7. Reinstall the EPC Control Assembly cover and then insert the ten screws and tighten
them to 16 in.-lb, using ABBToolTL1000/TL1002. Ensure that the flame-proof or
explosion-proof surfaces of the cover or the body of the Control Assembly are not
damaged.
8. Reinstall the EPC cover panel and insert the two holding screws.

Removing the Heater

Be sure that the EPC Control Assembly has cooled to ambient temperature
(approximately one hour) before proceeding.
1. Perform the "Preparation" procedure.
2. Remove the two screws holding the EPC cover and remove the cover panel.
2000-OSM, F2
CAUTION
8-49