View Menus; Errors And Warnings - A.O. Smith 400 - 2100 Installation & Operation Manual

7
Operating information

View menus

Depending on the Mode and Access Level selected (User or Advanced),
the following items may be view while the electronic controller is
powered up:
Errors
Error and warning messages.
BOIL OUT
Outlet water temperature.
BOIL IN
Inlet water temperature.
T
BOIL
Difference between sensed values of the outlet and inlet temperature
sensors.
TANK
Tank water temperature.
BOIL ON
Accumulated run time of water heater up to 999 hours, then resets and
repeats.
ADJUSTment menus
Depending on the Mode and Access Level (User or Advanced), several
adjustable parameter settings are provided to control the operation of
the unit.
MODE
Select 2 for standalone water heater operation or 3 for an externally
sequenced (or controlled by an external Building Management System)
water heater operation. Selection is either 2 or 3.
BOIL MAX (Advanced dipswitch position)
Maximum water heater target temperature. Selection is from 70° to
190°F. Factory default is 190°F.
Setpoint TARGET 1
Stage 1 setpoint target temperature. Selection is from 70°F to Boil Max.
Factory default is 125°F.
DIFF 1
Stage 1 differential. Selection is from 2° to 42°F. Factory default is 2°F.
Setpoint TARGET 2
Stage 2 setpoint target temperature. Selection is from 70°F to Boil Max.
Factory default is 2°F.
DIFF 2
Stage 2 differential. Selection is from 2° to 42°F. Factory default is 2°F.
STG DLY (Advanced dipswitch position)
Delay between stages. Selection is from 0:00 to 5:00 minutes in 10
second increments. Factory default is 30 seconds.
T MIN (Advanced dipswitch position)
Determines when the pump will stop purging heat from the heat
exchanger. Selection is from ON (for continuous pump mode), 1 to
20°F or OFF (when set to OFF, pump will run for 30 seconds after unit
shuts off). Factory default is 5°F.
T MAX (Advanced dipswitch position)
Determines when to generate a delta T MAX error code. Selection is
from 20°F to 80°F or OFF (to disable delta T max function). Factory
default is OFF.
Units
Allows for selection between Fahrenheit and Celsius. Selection is either
C° or F°. Factory default is °F.
(continued)
Error and warnings
Depending upon the Mode and parameter settings the
following error and/or warning messages may appear in
the electronic controller display when a fault condition
is sensed by the controller.
E01 "Err"
Electronic controller's EEPROM read an error during
power up.
E02 "Err"
Freeze protection is in progress, pump may be running
to prevent damage to the appliance.
BOIL OUT "SHr"
Water heater outlet sensor may be shorted.
BOIL OUT "OPn"
Water heater outlet sensor may be open.
BOIL IN "SHr"
Water heater inlet sensor may be shorted.
BOIL IN "OPn"
Water heater inlet sensor may be open.
TANK "SHr"
Tank sensor may be shorted.
TANK "OPn"
Tank heater inlet sensor may be open.
T MAX
If set, the maximum delta T was exceeded.
Installation & Operation Manual
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