Aerco KC Series Installation, Operation & Maintenance Instructions Manual page 18

LCD display on the front of the control panel.
They are labeled CLEAR,
The MAIN display is used during normal operation
of the unit. In the MAIN display, start sequence
and fault messages can be viewed. To return to
the MAIN display from any other display,
simultaneously press CLEAR and the
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.
When in the CYCLES display only the number of
cycles can be reset. To reset the number of cycles
to zero, simultaneously press the
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
"
arrow keys to set the date and time.
The following table shows the messages
displayed after accessing the CYCLES and SET
DATE DISPLAYS.
The number of times
# CYCLES =
"DATE" "TIME" completed it's start
cycle, and the time
SET DATE: Displays and allows
"DATE" "TIME"
3.5.2 ANNUNCIATOR FAULT MESSAGES
The following table lists the Annunciator fault
messages and their meanings.
MESSAGE
AC power has been
RESET MAIN interrupted. Power must
be shut off for 20
POWER
seconds to reset the
display.
Outlet water
HIGH WATER temperature has
TEMP exceeded the high
temperature limit
setting.
LOW GAS The unit has tripped due
PRESSURE to low gas pressure.
CONTROL PANEL OPERATING PROCEDURES
! "
, , and AUX.
!
arrow
! "
arrow
!
the controller has
and date
setting of the date
and time
MEANING
LOW WATER
LEVEL
REMOTE
DISABLED
PURGE INTLK
OPEN
LOW AIR FLOW
SYSTEM FAULT
PURGE
INTERLOCKS
SYSTEM FAULT
LOW AIR
PRESSURE
FLAME FAULT
DURING
IGNITION TRIAL
LOCKOUT RUN
AIR FLOW
LOCKOUT RUN
FLAME
LOCKOUT RUN
HI EXHAUST
TEMP
3.5.3 ANNUNCIATOR START SEQUENCE
MESSAGES
The following table lists the annunciator start
sequence messages.
MESSAGE
STANDBY
PURGING
IGNITION TRIAL
FLAME PROVEN
13
The unit water level is
below the probe level.
The interlock terminals,
in the relay box, are not
closed.
The proof of closure
switch or the purge
switch did not prove
closed during the start
sequence.
The air flow switch did
not proved closed
during the start
sequence.
The proof of closure
switch or purge switch
did not proved closed 45
seconds after the unit
attempted to start.
The air pressure switch
did not prove closed 45
seconds after the unit
attempted to start.
Flame did not prove at
the end of the trial for
ignition period.
The air pressure switch
opened after flame was
proven.
Flame signal was lost
after flame was proven.
The combustion
safeguard is locked out.
The exhaust gas
temperature has
exceeded 500º F
MEANING
The unit is in standby
mode waiting for a call
for heat
The unit is in the 7 sec
purge.
The unit is in ignition
position attempting to
light the burner
The unit has
established flame and
is running normally.