Aertrim O 2 Sensor Auto Calibration; Aertrim Menu Values And Defaults - Watts AERCO Benchmark BMK5000 Operation And Service Manual

Benchmark Platinum-Edge [ii]: Operation-Service Manual
SECTION 9 – AERTRIM OPERATION
Once the system operational stability conditions are met, the AERtrim system will execute the
following steps:
1. Lock the fire rate at the current position that needs adjustment to the air/fuel ratio.
2. The Demand LED will flash once per second to indicate that the trim function has started.
3. Check the oxygen levels inside the combustion chamber:
•
If oxygen levels are within the set range, AERtrim releases control.
•
If oxygen levels are outside the set range, AERtrim will adjust Blower Voltage to bring
the boiler back to the Target O
This process repeats until the target oxygen range is achieved or the unit reaches the allowable
blower voltage limit.
9.4 AERTRIM O
2
AERtrim includes an automatic O
sensor readout accuracy.
When sensor calibration occurs, the controller starts the O
seconds on the BMK5000 & 6000) in order to remove residual combustion fumes. Once purged,
the Controller reads the oxygen level of ambient air used for purging and calculates a calibration
offset between -3 and +3. The offset is applied to correct the sensor reading to the expected air
O % level of 20.9%. If the calculated offset is more than ± 3%, O
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message is displayed, and the trim function is disabled.
Auto Calibration occurs only when the unit is in Standby mode. For example, if the time
and day for an auto calibration passes, the Controller will wait for the boiler to cycle off and go
into Standby mode before executing the sensor calibration function.
If desired, a calibration can be initiated by enabling the Auto Calibrate Now control on the
Controller's O2 Sensor screen
Auto Calibration is disabled by default but is enabled during AERtrim activation (see Section
9.2, above). You can also use the Calibration Frequency, Time and O2 Offset
parameters to modify calibration frequency and time of day and enter an offset to the O
from the O2 Sensor screen.

9.5 AERTRIM MENU VALUES AND DEFAULTS

There are three AERtrim screens, available from
Performance →
AERtrim.
AERtrim Settings: To enable AERtrim, set the AERtrim parameter to Enabled. You
•
can then adjust the O2 Offset, Settle Time, Trim Gain and Trim Iteration
Limit parameters to values appropriate for the unit, per the tables below.
O2 Trim Parameters: Choose a Valve Position and then set the O2 Target,
•
Upper and Lower Limits for the valve position. You can then repeat this for all other
valve positions, per the tables below
•
AERtrim Status: Displays the current status of AERtrim operation.
For more information, see the Edge Controller Manual (OMM-0139, GF-213), Section 6.6.1.
OMM-0137_J •
12/20/2022
value.
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SENSOR AUTO CALIBRATION
sensor calibration feature, which helps maintain oxygen
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→ Calibration → Input/Output → O2 Sensor).
(Main Menu
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
Cal Purge for 40 seconds (55
2
Warning Service Required
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Main Menu → Advanced Setup →
reading
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