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The water heaters covered in this manual are equipped with an
electronic control system that regulates water temperature inside
the storage tank. Heating cycles and ignition are managed by the
control system. The ECO (energy cut out), flame sensor, pressure
switches and temperature probe are monitored by the control
system. The Combustion Blower, Spark Ignition Transformer,
powered anode rod (if applicable) and 24-volt gas valve are all
powered by the control system.
The main components of the control system are
interface module (UIM) and the central control board (CCB). The
UIM is located on the top front side of the water heater. The
CCB is mounted on top of the water heater inside a protective
enclosure. This unit is equipped with an Enable/Disable switch.
To operate the unit, make sure the switch is set to Enable. See
Features and Components on page10 for location of these and
all water heater components.
POWER
SUPPLY
BOARD
Figure 40. Control System Components
LCD Touch Display
Information
Display
Status Icons
Enable/Disable Switch*
Operational menus are multi functional.
CONTROL SYSTEM OPERATION
the user
CCB
BOARD
TRANSFORMER
Operating Set Point
Status: Heating
MENU
Figure 41. User Interface Module (UIM) Desktop Screen
CONTROL SYSTEM NAVIGATION
All operational information and user settings are displayed and
accessed from the UIM. The UIM houses the control system's
LCD Touch Display (liquid crystal display).
THE DESKTOP SCREEN
During normal operation the control system will display the
"Desktop" screen on the LCD Touch Display which is the default
screen. The control system will return to the Desktop screen
when there are no active Fault or Alert conditions or when there
has been no user input for several minutes.
•
Manufacturer and water heater model information is displayed
in Title Bar at the top of the Desktop screen. Menu titles are
displayed in the Title Bar when navigating the control system
menus.
•
The first temperature shown on the Desktop screen, Tank
Temperature, is the temperature of the water inside the water
heater's storage tank.
•
The second temperature shown on the Desktop screen
is the Operating Set Point. The Operating Set Point is the
temperature at which the control system will maintain the
water inside the storage tank.
•
Beneath the Operating Set Point is the "Status" line. The
Status line shows the current operational state of the control
system in real time. See Table 19 (page 43) for a description
of the various operational states.
•
The Desktop screen also displays animated "Status Icons" to
convey operational information, see Table 18 on page 42 for
descriptions of the Status Icons.
120°F
OFF
O
GAS
N
HELP
* See the Features and
Components section of this
manual for the precise location.
41
Title Bar
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