Chapter 8
Innovation Series Water Heaters
GF-128
RS232 Communication
USER MANUAL
OMM-0079_0B
07/21/11 AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
•
Ph: 800-526-0288
Page
89
of
200
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 unit:
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 heater running in Constant Setpoint mode.
Table 8-1. Sample Fault Log Display
No.
Fault Message
Cycle Date
Time
0
Direct Drive Signal Fault
609 1/10/02
8:42am
1
Low Gas Pressure
366 7/04/01
5:29pm
2
Loss of Power
0 1/01/01
11:50am
Table 8-2. Sample Operation Time Log Display
Status
Fire Rate
Flame
Run Length
Date
Time
Off, Direct Drive
0
0
8
1/15/02
2:35pm
Run, Direct Drive
38
100
34
1/15/02
2:27pm
Run, Direct Drive
31
100
30
1/15/02
1:53am
Run, Direct Drive
35
100
2
1/15/02
1:23pm
Run, Direct Drive
29
100
0
1/15/02
1:21pm
Ignition
0
0
0
1/15/02
1:20pm
Off, Switch
0
0
35
1/15/02
12:30pm
Run, Manual
40
100
0
1/15/02
11:55am
Ignition
0
0
0
1/15/02
11:55am
Power-up
0
0
0
1/15/02
11:50am
