Aertrim Maintenance And Troubleshooting - Watts Aerco Benchmark OMM-0117 Operation And Maintenance Manual

Benchmark 5000-6000 Operation & Maintenance Manual
SECTION 6 – AERTRIM OPERATION

6.7 AERtrim MAINTENANCE and TROUBLESHOOTING

The AERtrim system, which maximizes blower efficiency, depends on the O
AERtrim system needs only minimal maintenance. It is recommended that you inspect the
oxygen sensor for accuracy every 12 months by comparing it to a sensor reading from a
properly calibrated flue analyzer. This is strongly advised because contaminated air or gas
supplies may cause impurity buildup and shift the calibration point. An offset value of ±3% can
be entered in the Trim menu to correct the reading during manual calibration. If the sensor has a
large amount of offset, a replacement may be required soon.
Occasional software updates to the device may be required. See TID-0156 for the software
update procedure.
TABLE 6-2: AERtrim General Warnings
WARNING
O2 PERCENTAGE
LOW
O2 SENSOR
MALFUNCTION
WARNING 02 LEVEL
HIGH
O2 SENSOR OOR
MAINT REQUIRED
(OutOfRange)
O2 WARNING
SERVICE REQUIRED
OMM-0118_B • GF-203 • 5/9/2019
CAUSE
O Levels less than 2% for more
2
than 30 seconds {auto-reset when
valve comes back in range}
O Levels less than -4% or more
2
than 24% for more than 10 seconds
{manual clearing of this fault is
required}
O Levels > 9% and < 24% for more
2
than 30 seconds {auto-reset when
value comes back in range}
Sensor auto calibration offset
required is more than ±3%
If the O level is outside of its limits
2
for more than 5 minutes.
For example:
1) Reading < Lower Limit
& Blower Voltage = BV Limit
OR
2) Reading > Upper Limit
& Blower Voltage = BV Limit
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
sensor. The
2
POSSIBLE SOLUTIONS
Dirty filter or poor combustion
calibration – recalibrate unit
Offset too low – Increase
O
2
Offset value
Bad Sensor-Replace
Bad Sensor-Replace
Communication Issue – check
wires and connections
Gas Pressure Regulator or Air
Blower Problem, or bad
Combustion Calibration
O Offset too high
2
Bad Sensor-Replace
Reset Unit-Recalibrate Sensor
Bad Sensor-Replace
Bad ECU-Replace (Rare)
Gas Supply, Air Filter, or Air
Blower issue
Bad Sensor-Replace
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