Control System Operation; Control System Navigation - State Water Heaters 301 Series Instruction Manual

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 probes are monitored by the control
system. The Combustion Blower, Spark Ignition Transformer,
24-volt gas valve and anode rods are all powered by the control
system.
The main components of the control system are the user 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
unit, make sure the switch is set to Enable. See
(page 8) for location of these and all water heater
Components
components.
POWER
SUPPLY
BOARD
Figure 58. Control System Components
LCD Touch Display
Information
Display
Status Icons
Enable/Disable Switch
Operational menus are multi functional.

CONTROL SYSTEM OPERATION

Features and
CCB
TRANSFORMER
Tank Temperature
Operating Set Point
Status: Heating
MENU
Figure 59. 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. Operating States
on page 47 for a description of the various operational
states.
• The Desktop screen also displays animated "Status Icons"
to convey operational information, see
46) for descriptions of the Status Icons.
103°F
120°F
OFF
O
GAS
N
HELP
45
(page
Table 18
Title Bar