Operation Details - Watts Aerco Benchmark OMM-0117 Operation And Maintenance Manual

Benchmark 5000-6000 Operation & Maintenance Manual
SECTION 6 – AERTRIM OPERATION
AERtrim Activation Instructions
1. Record the following information from the unit you wish to activate:
•
The unit's Alpha – Year – Serial Number, found on the unit's code plate. For
example, for a unit built in 2017: N-17-0355.
•
O Trim ID, found in the
2
(item 33 in Section 2.6).
•
Fixed ID, found in the
2. Contact AERCO Sales Administration with the recorded information. They will provide you
with a license key.
3. Once you have obtained the license key, navigate to the O
menu and enter the key. The O
the display does not change to the O
provided to obtain the key, or with the key itself. Double check your numbers and Contact
Sales Administration for another key.
4. The target O %, O
2 2
as needed. However, you must enable the Adjust O2 Trgts option in the O
before you can change these settings.

6.3 OPERATION DETAILS

During operation, the AERtrim system will add or subtract a limited amount of voltage to the
value sent to the combustion air blower. The amount of voltage trim depends on the error
between the desired O
variable) and also on high and low limits of blower voltage. The total amount of corrective
voltage trim is limited by the controller to insure safe and reliable operation of the system.
The AERtrim system has a rolling active/inactive operation based on 4 hours on / 10 hours off
sequence. Since this is a trim function and not an active control function, the trim activity can
make adjustments in the blower voltage calibration values on the 4/10 schedule to effectively
control the air/fuel mixture without continuous operation of the sensor. This method achieves
the objective for long term efficiency of boiler operation while maximizing the sensor life in the
boiler environment. The 14 hour cycle insures that the 4 hour on period will be active for any
hour of the day every four days as shown below.
Figure 6-2: Active O
OMM-0118_B • GF-203 • 5/9/2019
O2 Trim Key
Fixed Key in the Configuration Menu (item 34 in Section 2.6).
Trim Menu and AERtrim should automatically enable. If
2
Trim Menu, something is wrong with the values
2
upper range, and lower range are at default values but can be changed
% (SP-setpoint) and the current reading of the O
2
Sensor Cycle Coverage Chart
2
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
in the C-More Controller's Configuration Menu
Trim Key in the Configuration
2
Trim menu
2
sensor (PV-process
2
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