Aerco Benchmark G-00-711, User Manual

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CONTROL PANEL OPERATING PROCEDURES
8/1/99 3-5
Figure 3.8
Annunciator Function Switches and LCD Display
The status annunciator only monitors the boilers
control system. If any portion should fail, the
boiler will still operate with no adverse effects.
3.5.1 ANNUNCIATOR FUNCTION
SWITCHES and DISPLAYS
The Annunciator has three function displays that
are available to the operator. These are the
MAIN, the CYCLES, and the SET DATE
displays. These displays are accessed using the
four membrane switches located directly under
the LCD display on the front of the control panel.
They are labeled CLEAR,

,

, and AUX.
The MAIN display is used during normal
operation of the unit. In the MAIN display, start
sequence and fault messages can viewed. To
return to the MAIN display from any other
display, simultaneously press CLEAR and the

arrow key. To reset the MAIN display after a
fault has occurred press the CLEAR button.
The CYCLES display indicates the date and
time, and the number of cycles the unit has
started since it was reset. When in the CYCLES
display only the number of cycles can be reset.
To reset the number of cycles to 0,
simultaneously press the

, and

arrow keys
and hold them for approximately four seconds.
In the SET DATE display, both the time and date
are displayed and can be changed.
To access the SET DATE display, press the
CLEAR button while in the CYCLES display.
Continue pressing the CLEAR button to move
through the SET DATE display fields. Use the

and

arrow keys to set the date and time.
The following table shows the messages
displayed after accessing the CYCLES and SET
DATE displays.
# CYCLES =
“DATE” “TIME”
The number of times
the controller has
completed it’s start
cycle, and the time
and date of the last
reset
SET DATE:
“DATE” “TIME”
Displays and allows
setting of the date
and time
3.5.2 ANNUNCIATOR FAULT
MESSAGES
The following table lists the Annunciator MAIN
display fault messages and their meanings.
MESSAGE MEANING
RESET MAIN
POWER
AC power has been
interrupted. Power must
be shut off for 20
seconds then restored
to reset the display.
HIGH WATER
TEMP
The unit has locked out
due to the outlet water
temperature exceeding
the high temperature
limit setting.
LOW GAS
PRESSURE
The unit has tripped
due to low gas
pressure.
HIGH GAS
PRESSURE
The unit has tripped
due to high gas
pressure
LOW WATER
LEVEL
The shell water level is
below the probe level.
INTERLOCK
OPEN
The interlock terminals,
in the relay box, are not
closed.
PURGE INTLK
OPEN
The proof of closure or
the purge switch did not
prove closed during the
start sequence.
LOW AIR FLOW
The airflow switch did
not prove closed during
the start sequence.
SYSTEM FAULT
PURGE
INTERLOCKS
The proof of closure or
purge switch did not
prove closed 45
seconds after the unit
attempted to start.
SYSTEM FAULT
LOW AIR
PRESSURE
The air pressure switch
did not prove closed 45
seconds after the unit
attempted to start.
FLAME FAULT Flame did not prove at
FAULT
CLEAR
AUX
MODE
ON
ANNUNCIATOR DISPLAY
ANNUNCIATOR FUNCTION SWITCHES