AERCO Esteem Boiler with EZ-Set Controller - Manual (Page 166)

GF-135 Esteem 399 Low NOx Boiler
Chapter 18
OMM-0089_0A Installation, Operation & Maintenance Manual Controller Operation
18.9.12 DHW Proportional Gain (Default: 7)
DHW Proportional Gain allows the cascade response to be adjusted for a domestic hot water
call. DHW Proportional Gain has the greatest influence when the system temperature is far
away from the setpoint. Press the LEFT or RIGHT buttons to adjust the DHW Proportional Gain
then press the OK button to store the setting.
Figure 18-63: DHW Proportional Gain Menu
Increase DHW Proportional Gain:
• The Cascade System will reach setpoint faster, but over shooting the setpoint may occur.
• To reach the setpoint faster, increase the DHW Proportional Gain value by 2. Perform
Cascade Auto-detection and initiate a domestic hot water call. Observe the cascade
response and make further adjustments if necessary.
Decrease DHW Proportional Gain:
• The Cascade System will take longer to reach the setpoint, but setpoint overshooting is
minimized.
• If the setpoint is reached too quickly, decrease the DHW Proportional Gain value by 2.
Perform Cascade Auto-detection and initiate a domestic hot water call. Observe the
cascade response and make further adjustments if necessary.
NOTE
Only make adjustments to this setting after consulting AERCO
Technical Support. Improper adjustment of DHW Proportional Gain
could lead to temperature fluctuations and erratic cascade
operation.
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Page 166 of 188 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0089_0A
MC1 06/19/14 Ph.: 800-526-0288