BMK 750-3k Platinum Boiler OPERATION, SERVICE, and MAINTENANCE GUIDE
SECTION 4 – AERTRIM OPERATION
Page
40
of
178
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
OMM-0116_0A
03/15/2017
Ph.: 800-526-0288
GF-201
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: G-17-2291, or N-17-0355.
•
O
2
Trim ID
, found in the
O2 Trim Key
in the
Configuration
Menu (item 33 in Section
2.6).
•
Fixed ID
, found in the
Fixed Key
in the
Configuration
Menu (item 34 in Section 2.6).
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
2
Trim Key
in the
Configuration
menu in the C-More and enter the key. The O
2
Trim menu and AERtrim should
automatically enable. If the display does not change to the O
2
Trim menu, something is
wrong with the values 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
2
%, O
2
upper range, and lower range are at default values but can be changed
as needed. However, you must enable the
Adjust O2 Trgts
option in the O
2
Trim menu
before you can change these settings.
4.3 OPERATION DETAILS
During operation, the AERtrim system will adjust the command voltage sent to the combustion
air blower within a limited range. The amount of voltage trim depends on the error between the
desired O
2
% (target %) and the current reading of the O
2
sensor (O
2
%) and also on high and
low limits of blower voltage for each valve position. 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 4-2:
Active O
2
Sensor Cycle Coverage Chart