Heater Status Menu - A.O. Smith 101 Series Instruction Manual

temperatures menu (cont)
description/action
• tank temperature - non adjustable - control system
sensed temperature (averaged from upper and lower
temperature probes).
• upper temperature - non adjustable - control system
sensed temperature from the Upper Temperature Probe.
• lower temperature - non adjustable - control system
sensed temperature from the Lower Temperature Probe.
• (heater regulated to tank) - non adjustable -
configuration information.
• upper probe & lower probe offset - adjustable user
setting, range -5° to +5° (factory setting 0°).
note: These settings should only be used if the hot water
supply temperature varies greatly from the operating Set
Point setting.
The Upper and Lower Probe Offsets are used to calibrate
control system temperature sensing. This can improve the
precision of temperature control in the storage tank and at
points of use. This feature can also be used to compensate
for building recirculation loops (hot water returning to the
storage tank) that may cause the heating cycles to terminate
prematurely.
Example: if the current sensed temperature from a
temperature probe is 120°F (49°C) and the Offset setting for
that probe is adjusted to a value other than 0°, the control
system would calibrate or "offset" the sensed temperature
from the probe and the averaged tank temperature. Heating
cycles would be activated and deactivated based on the
calibrated (offset) temperature.
These settings are adjusted in the same way described for
the Operating Set Point And Differential Adjustment on page
45.

heater status menu

description/action
Select Heater Status from the main menu and press the
Operational Button under "SELECT" to enter this menu. This
menu contains non adjustable operational information. Use the
Up & Down Buttons to navigate the menu.
• status - displays the current Operating State, see Table 12
on page 44.
• eco contact, low gas ps, Blocked inlet ps, Blocked
outlet ps, Blower prover ps - displays the current state
of the switch contacts; open or closed.
• Blower on, igniter on, gas Valve on - displays whether
or not the control system is currently energizing these water
heater components; yes = energized, no = de-energized.
• igniter current - displays whether or not the control
system has detected the required minimum current, see
Sequence Of Operation on page 54.
• flame detected - displays whether or not the control
system has detected main Burner flame during ignition from
the flame sensor.
• External input enable - displays whether or not the S1
dipswitches have been configured to activate the enable/
disable circuit, see Enable/Disable Circuit on page 39.
• ignition trials - displays whether or not the S1 dipswitches
have been configured to allow 1 or 3 trials for ignition
before declaring an "ignition Failure" Fault condition, see
the CCB - Central Control Board Layout on page 63.
Temperatures
Operating Set Point
Differential
Tank Temperature
Upper Temperature
Lower Temperature
(Heater Regulated to Tank)
Upper Probe Offset
CHANGE
bottom of menu
Temperatures
Differential
Tank Temperature
Upper Temperature
Lower Temperature
(Heater Regulated to Tank)
Upper Probe Offset
Lower Probe Offset
CHANGE
Heater Status
Status
ECO Contact
Low Gas PS
Blocked Inlet PS
Blocked Outlet PS
Blower Prover PS
Blower On
bottom of menu
Heater Status
Blower On
Igniter On
Igniter Current
Gas Valve On
Flame Detected
External Input Enable
Ignition Trials
46
display
Top of menu
140°F
8°F
120°F
122°F
118°F
0°F
BACK HELP
8°F
120°F
122°F
118°F
0°F
0°F
BACK HELP
display
Top of menu
Standby
Closed
Closed
Closed
Closed
Open
No
BACK HELP
No
No
No
No
No
No
3
BACK HELP