Ccb (Central Control Board) - State Water Heaters 120 Series Service Handbook

CCB (CENTRAl CoNTRol BoARD)

The CCB is a printed circuit board mounted inside a protective plastic enclosure, see Figure 38 and Figure 39
below. The CCB circuit board is the main control. All instructions for ignition and temperature control originate
from this circuit board. diagnostic and operational messages are generated by the CCB and sent to the uIM,
see uIM (user Interface Module) on page 37.
Most of the water heater's components, such as the Igniter, Combustion Blower, 24 Volt Gas Valve, and
Temperature Probe are directly connected to one of the CCB's socket connectors. If the CCB fails the
replacement will be installed in a new enclosure with a new transformer. There is no need to remove the
circuit board from the existing enclosure when the CCB is being replaced.
CCB ENCLOSURE WITH FRONT REMOVED
CCB CIRCUIT BOARD
FRONT
TOP OF WATER HEATER
120 VAC X 24 VAC
50 VA TRANSFORMER
CCB ENCLOSURE
CCB ENCLOSURE COVER SCREWS (2)
FRONT COVER ON
Servicing should only be performed by a Qualified Service Agent
Figure 38
TRANSFORMER COVER
RAISED EDGES (3)
FOR WIRING
STRAIN RELIEF
Figure 39
CCB CIRCUIT BOARD MOLDED CLIPS
FRONT COVER REMOVED
39