Operating States; Control System Menus - A.O. Smith dre-52 Service Handbook

Table 2 - Operating States
STATE
Standby
Heating
Alert
Fault
Table 3 - Control System Menus
†
MENUS
Temperatures
Heater Status
Economy Mode
Setup
Alarm Output Setup
Display Settings
Heater Information
Current Fault/Alert
Fault History
Fault Occurrence
Restore Factory
Defaults
Help Menu
†. This table shows a list of the control system menus. These menus will be explained in greater detail
in the pages that follow.
Servicing should only be performed by a Qualified Service Agent
ELECTRONIC CONTROL SYSTEM
The water heater is not in an active heating cycle. This usually indicates the
temperature in the tank has reached the Operating Set Point and the control system
has terminated the heating cycle.
The control system is in the Heating Mode. At least one bank of heating elements has
been energized.
The control system has detected/declared an Alert Condition. The controls system will
continue heating operation. However, a Qualified Service Agent should be contacted to
check/service the water heater.
The control system has detected/declared a Fault Condition. The control system will
discontinue heating operation and "lock out." Power to the water heater must be cycled
off and on to reset the control system. Note; cycling power will not reset the control
system until the condition that caused the fault has been corrected.
Most commonly accessed menu. Operating Set Point, Differential settings, Tank
Temperature and Tank Probe Offset are located in this menu.
Current Operating State/Mode (heating/standby etc) and status (open/closed - on/off -
yes/no) of monitored water heater functions and components are displayed in this
menu.
Seven day 24 hour time clock with temperature set back capability to reduce operating
costs during unoccupied or reduced demand periods.
The control system's CCB (Central Control Board - see page 42) features on board
SPDT (single pole double throw) relay contacts for building EMS (Energy Management
System) notification of operational conditions such as Fault Conditions and heating
mode status. This menu features a list of user definable conditions for relay activation.
Temperature units (°F or °C), appearance (brightness contrast) and backlight delay
user adjustable settings are located in this menu.
Elapsed time of operation, total heating cycle time, heating cycle count, heating
element bank(s) cycle count and heating bank on time along with UIM and CCB
software revisions can be viewed in this menu.
Displays any current Alert or Fault messages.
Retains 9 event history of Fault/Alert messages with time stamp. The Fault History is
useful when dealing with intermittent operational problems or when the customer has
reset the control system prior to a service agent's arrival.
Total accumulated number each individual Fault condition has occurred is displayed in
this menu. This running total of Fault Occurrences can be useful in determining which
(if any) operational problems have been persistent.
This control system feature allows the user to restore control system user settings to
their factory default settings. Alarm Output Setup and Display Settings menu items
ARE NOT changed when factory defaults are restored.
Accessible by pressing the corresponding Operational Button from most menus and
screen displays. This menu provides access to instructions and explanations for user
settings, Operating States, Status Icons, manufacturer's web address, technical
support phone number and service agent contact information.
DESCRIPTION
DESCRIPTION
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