AERCO Esteem Boiler with EZ-Set Controller - Manual (Page 161)

GF-135 Esteem 399 Low NOx Boiler
Chapter 18
OMM-0089_0A Installation, Operation & Maintenance Manual Controller Operation
18.9.5 Boiler Enabling Algorithm
The Master boiler uses the following algorithm to determine when the next boiler can be enabled:
x Minimum Firing Rate = Individual Boiler Firing Rate
Once the currently fired boilers reach the calculated firing rate, the next boiler can be enabled
without affecting the overall cascade firing rate. For example, the calculation for a Cascade
System consisting of two Esteem 399 boilers would be:
x 30% = 60%
Once the first Esteem firing rate reaches 60%, the second Esteem can be enabled. Both will
then fire at the minimum 30% firing rate so that the overall output from the Cascade System
remains the same.
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18.9.6 Boiler Disabling Algorithm
Once the firing rate of all currently fired boilers decreases to the Minimum Firing Rate, a boiler
can be disabled. The boilers which continue to fire will increase their firing rate if required to
replace the output of the dis-abled boiler.
NOTE
Stable cascade operation requires that all boilers in a cascade
System be the same size. Mixing boiler sizes in a cascade System
could lead to temperature fluctuations and erratic cascade
operation.
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18.9.7 Maximum Firing Rate (Default: 398 MBH)
Maximum Firing Rate is the maximum firing rate of a single boiler in the Cascade System.
Figure 18-58: Maximum Firing Rate Menu
Press the LEFT or RIGHT buttons to adjust the Maximum Firing Rate then press the OK button
to store the setting.
Number of Boilers Firing +1
Number of Boilers Firing
1 + 1
1
NOTE
The recommended maximum
firing rate for the Esteem 399 is
398 MBH
.
Page 161 of 188 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0089_0A
MC1 06/19/14 Ph.: 800-526-0288