Ccb Cover Removal And Replacement - State Water Heaters 120 Series Service Handbook

ccb cover removal and replacement

The cover on the CCB enclosure must be removed for various service procedures outlined in this manual.
Refer to the instructions on page 40 when removing and replacing the CCB cover.
Wiring to and from the CCB and other water heater components enters the CCB enclosure on the left side.
Strain relief for the wiring is provided between the enclosure's front cover and the internal transformer cover.
The wires and cables are held in place between the inside of front cover and three raised edges molded in
the top of the internal transformer cover as the cover screws are tightened. Two screws (on the left side) and
two molded clips (on the right side) hold the CCB's front cover in place, see Figure 39 on page 39.
Removing the enclosure cover is a simple procedure. Care must be taken when replacing the CCB cover
to ensure the wiring is routed properly and the cover is replaced correctly. Follow the procedures below to
ensure the wiring is not pinched or damaged and no connectors are accidentally unplugged.
Cover Removal Procedure:
Refer to Figure 3 on page 8 and Figure 39 on page 39 for these instructions.
1. Ensure power to the water heater is turned off.
2. Remove the 4 screws that hold the top cover in place.
3. Remove the 2 CCB cover screws from the CCB.
4. Swing the cover away from the enclosure from left side and disengage the molded clips on the right.
Cover Replacement Procedure:
Refer to Figure 40 below and Figure 39 on page 39 for these instructions.
1. Route all wiring and cables side-by-side flat across the transformer cover. Ensure the wiring and cables
are not stacked on top of each other as this will prevent the cover from seating properly and may damage
the wiring.
2. Route all wiring and cables between the two cover screw wells on the transformer cover.
3. use electrical tape to secure the wiring to the transformer cover before replacing the cover as shown.
4. Replace the CCB cover by first engaging the molded clips on the right side of the enclosure with the
mating clips on the cover. Replace the CCB cover screws, do not over tighten.
5. Restore power to the water heater and run it through at least one complete heating cycle before leaving
to ensure no wiring was unplugged or damaged, see the Service notes below.
Service Notes:
If any operational problems, fault conditions or Control System lock outs occur after the CCB enclosure
cover has been removed and replaced, remove the cover again to ensure none of the wiring connectors are
unplugged and/or any of the wiring has been pinched, cut or damaged.
40
Figure 40
Servicing should only be performed by a Qualified Service Agent