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HEATING ELEMENT OPERATION
Figure 10. Heating Element Numbering and Configuration
Depending on tank size and how they were ordered from the
factory the water heaters covered in this manual may be equipped
with 1 to 5 electric heating elements. The illustration here shows
how the heating elements are numbered for control purposes and
how the openings for each heating element are physically located
on the water heater's storage tank.
CONTROL OPTIONS
The water heaters covered in this manual are factory ordered with
1 of 3 different heating element control options as follows:
On/Off Control: This is the only configuration available on
models equipped with a single heating element and the standard
configuration on models equipped with more than one element.
All elements are cycled on simultaneously with each call for heat,
however there is a one second delay between elements being
energized to reduce starting current. All elements are cycled off
at the same time at the end of each heating cycle.
Linear Sequencing: Only available on models equipped with
multiple heating elements. Elements are energized and de-
energized according to adjustable (1 to 20°F) Differential set
points for each element. Element Rotation - first element on is
rotated with each successive call for heat. First On/Last Off - the
first heating element energized at the beginning of a heating cycle
is the last element de-energized at the end of the heating cycle.
Successive heating cycles would progress as follows on a model
equipped with 3 heating elements:
•
First heating cycle: Elements come on [1, 2, 3] and cycle off
[3, 2, 1].
•
Second heating cycle: Elements come on [2, 3, 1] and cycle
off [1, 3, 2].
•
Third heating cycle: Elements come on: [3, 1, 2] and cycle
off [2, 1, 3].
•
Fourth heating cycle: pattern repeats - same as first.
Progressive Sequencing: Only available on models equipped
with multiple heating elements. Elements are energized and
de-energized according to adjustable (1 to 20°F) Differential set
points for each element. Element Rotation - first element on is
rotated with each successive call for heat. First On/First Off - the
first heating element energized at the beginning of a heating cycle
is the first element de-energized at the end of the heating cycle.
Successive heating cycles would progress as follows on a model
equipped with 3 heating elements:
•
First heating cycle: Elements come on [1, 2, 3] and cycle off
[1, 2, 3].
•
Second heating cycle: Elements come on [2, 3, 1] and cycle
off [2, 3, 1].
•
Third heating cycle: Elements come on: [3, 1, 2] and cycle
off [3, 1, 2].
•
Fourth heating cycle: pattern repeats - same as first.
CONTROL SYSTEM OPERATION
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CONTROL SYSTEM FEATURES
ADVANCED DIAGNOSTICS
Plain English text and animated icons display detailed operational
and diagnostic information. LCD screen on the front of the water
heater displays the Sequence of Operation in real time. Fault or
Alert messages are displayed when operational problems occur.
Advanced Service menu displays a list of possible causes for
current Fault and Alert conditions to aid in servicing.
ECONOMY MODE OPERATION
Control system automatically lowers the Operating Set Point by a
programmed value during user defined time periods. Helps reduce
operating costs during unoccupied or peak demand periods.
CONTROL SYSTEM NAVIGATION
The UIM (User Interface Module) is located on the front cabinet
of the water heater. All operational information and user settings
are displayed and accessed using the UIM. The UIM includes five
snap acting (momentary) user input buttons; an Up, Down and 3
Operational Buttons.
Figure 11. Desktop Screen Navigation
UP & DOWN BUTTONS
Used to navigate (up and down) and to select (highlight) menu
items. Also used to adjust or change (increase/decrease, on/off,
set time) various user settings.
OPERATIONAL BUTTONS
The 3 Operational Buttons are multifunctional. Their current
function is defined by the text that appears directly above each
button on the LCD screen. The function will change depending on
what menu is currently displayed or what menu item is selected.
When no text appears on the LCD screen above an Operational
Button there is no function assigned.
THE DESKTOP SCREEN
The illustration below shows the control system "Desktop Screen."
This is the default screen. If there are no active Fault or Alert
conditions and no user input for approximately 10 minutes the
control system will return to this screen automatically.
Model Information: Model information and menu titles are shown
in the black bar at the top of the Desktop Screen.
Tank Temperature: Current water temperature as sensed from
the immersion Temperature Probe.
Operating Set Point: Temperature at which the control system will
maintain tank (water) temperature in the Normal Mode. This line
of text will read Economy Set Point whenever the control system
is operating in the Economy Mode.
Status: The Operating State of the control system is displayed
beneath the Operating Set Point.
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