Watts AERCO KC Series User Manual page 19

The number of times
# CYCLES =
completed it's start
"DATE" "TIME"
cycle, and the time
Displays and allows
SET DATE:
"DATE" "TIME"
3.5.2 ANNUNCIATOR FAULT
MESSAGES
The following table lists the Annunciator MAIN
display fault messages and their meanings.
MESSAGE
interrupted. Power must
RESET MAIN
POWER seconds to reset the
due to the outlet water
HIGH WATER temperature exceeding
TEMP the high temperature
LOW GAS
PRESSURE
LOW WATER The shell water level is
LEVEL below the probe level.
The interlock terminals,
REMOTE
in the relay box, are not
DISABLED
The proof of closure, or
the purge switch did not
PURGE INTLK
prove closed during the
OPEN
The airflow switch did
not prove closed during
LOW AIR FLOW
The proof of closure or
SYSTEM FAULT
PURGE
seconds after the unit
INTERLOCKS
The air pressure switch
SYSTEM FAULT did not prove closed 45
LOW AIR seconds after the unit
PRESSURE
FLAME FAULT Flame did not prove at
DURING the end of the trial for
IGNITION TRIAL
The air pressure switch
LOCKOUT RUN
opened after flame was
AIR FLOW
LOCKOUT RUN Flame signal was lost
FLAME after flame was proven.
CONTROL PANEL OPERATING PROCEDURES
the controller has
and date
setting of the date
and time
MEANING
AC power has been
be shut off for 5
display.
The unit has tripped
limit setting.
The unit has tripped
due to low gas
pressure.
closed.
start sequence.
the start sequence.
purge switch did not
prove closed 45
attempted to start.
attempted to start.
ignition period.
proven.
LOCKOUT RUN
HI EXHAUST
TEMP
3.5.3 ANNUNCIATOR START
SEQUENCE MESSAGES
The following table lists the annunciator MAIN
display start sequence messages.
MESSAGE
STANDBY
PURGING
IGNITION TRIAL
FLAME PROVEN
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
POWER
PILOT
FLAME
MAIN
ALARM
14
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 firing.
FUNCTION
Lights upon power up of
the unit.
Lights when the re is a call
for heat.
Lights once flame has
been detected.
Lights after flame has
been detected and
stabilized
This lights when the
controller is in a
LOCKOUT condition.