AERCO KC1000 Boiler equipped with Mod-Box Controller - Manual (Page 19)

CONTROL PANEL OPERATING PROCEDURES
14
# CYCLES =
“DATE” “TIME”
The number of times
the controller has
completed it’s start
cycle, and the time
and date
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 5
seconds to reset the
display.
HIGH WATER
TEMP
The unit has tripped
due to the outlet water
temperature exceeding
the high temperature
limit setting.
LOW GAS
PRESSURE
The unit has tripped
due to low gas
pressure.
LOW WATER
LEVEL
The shell water level is
below the probe level.
REMOTE
DISABLED
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
DURING
IGNITION TRIAL
Flame did not prove at
the end of the trial for
ignition period.
LOCKOUT RUN
AIR FLOW
The air pressure switch
opened after flame was
proven.
LOCKOUT RUN
FLAME
Flame signal was lost
after flame was proven.
LOCKOUT RUN
The combustion
safeguard is locked out.
HI EXHAUST
TEMP
The exhaust gas
temperature has
exceeded 500º F
3.5.3 ANNUNCIATOR START
SEQUENCE MESSAGES
The following table lists the annunciator MAIN
display start sequence messages.
MESSAGE MEANING
STANDBY
The unit is in standby
mode waiting for a call
for heat
PURGING
The unit is in the 7-sec
purge.
IGNITION TRIAL
The unit is in ignition
position attempting to
light the burner
FLAME PROVEN
The unit has
established flame and
is firing.
3.6 THE COMBUSTION SAFEGUARD
The Combustion Safeguard is responsible for
monitoring the safety components during the
start sequence, and after flame is established. It
is also responsible for the timing the purge and
ignition cycles during the start sequence.
The combustion safeguard is located on the left
side of the control panel as shown in Figure 3.9.
There are five status LED’s that indicate the
status of operation. Along with the annunciator,
these are useful as a double check for proper
system operation and troubleshooting.
The table below defines the function of each
light. The reset button located under the LED’s
is to reset the combustion safeguard a lockout.
DESCRIPTION FUNCTION
POWER
Lights upon power up of
the unit.
PILOT
Lights when the re is a call
for heat.
FLAME
Lights once flame has
been detected.
MAIN
Lights after flame has
been detected and
stabilized
ALARM
This lights when the
controller is in a
LOCKOUT condition.