AERCO KC1000 Low NOx Water Heater July 2011 - Manual (Page 76)

RS232 COMMUNICATION
8-2
(c) Menu changes will be stored in non-
volatile memory.
To redisplay the menu and view the option
which was just changed in step 5, enter D
and press <Rtn>.
To display the Fault (F) Log, Sensor (S) Log or
Time (T) Line Log, press F, S or T followed
by <Rtn>. Refer to paragraph 8.4 for
descriptions and samples of these data logs.
To log off and terminate the RS232 com-
munication link, press L followed by <Rtn>.
8.4 DATA LOGGING
During operation, the C-More Control Panel
continuously monitors and logs data associated
with operational events, faults and sensor
readings associated with the boiler or water
heater system. Descriptions of these data logs
are provided in the following paragraphs. The
basic procedure for accessing each data log is
described in paragraph 8.3, step 7.
8.4.1 Fault Log
The C-More Control Panel logs the last 20 faults
(0 – 19) starting with the most recent (#0). They
can be viewed in the front panel display or via
the RS232 port. The Fault Log cannot be
cleared. If the Fault Log already contains 10
faults, the earliest fault is overwritten when a
new fault occurs. A sample Fault Log display is
shown in Table 8-1.
NOTE:
The Operation Time (T) Log can store
thousands of records. Therefore, to view the
most recently logged record, enter “T” followed
by 0 (zero) and press Enter
(i.e. T0 <Enter>). To view earlier records in
reverse chronological order, enter T and press
Enter. To go back 200 or 1000 records, enter
T200 or T1000, etc. and press Enter.
8.4.2 Operation Time Log
The Operation Time Log consists of a string of
ASCII records stored in non-volatile memory
within the C-More Control Panel. Events such
as power-up, ignition and turn-off are time
stamped. Data logged while the unit is running
are run-length encoded. Data is logged or the
run-length incremented every 30 seconds. For a
new run record to be logged, the fire rate or
flame strength must change by more than 5%,
or the run mode must change. At steady-state,
the run-length is allowed to reach a maximum of
30 minutes before the record is logged. This
means that no more than 30 minutes of data can
be lost if the unit loses power. Table 8-2 shows
a sample Operation Time Log for a boiler:
The Operation Time Log can only be accessed
through the RS232 interface using a laptop or
other terminal device. Ten operation time
records are displayed for each T command
entry. The operation time log can be cleared
ONLY by factory authorized personnel using the
Clear Log option in the Factory menu.
NOTE:
The Sensor (S) Log can store up to 1200
records. Therefore, to view the most recently
logged record, enter “S” followed by 0 (zero) and
then press Enter (i.e. S0 <Enter>). To view
earlier records in reverse chronological order,
enter S and press Enter. To go back 200 or 700
records, enter S200 or S700, etc. and press
Enter.
8.4.3 Sensor Log
The sensor values can be logged at a different
rate if needed by setting the Sensor Log Interval
in the Diagnostics Menu. The log interval can
vary from once every minute to once every day.
Table 8-3 shows a sample Sensor Log every 5
minutes for a boiler running in Constant Setpoint
mode.