GF-135
Esteem 399 Low NOx Boiler
Chapter 18
OMM-0089_0A
Installation, Operation & Maintenance Manual Controller Operation
Page
160
of
188
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
OMM-0089_0A
MC1 06/19/14
Ph.: 800-526-0288
18.9.3 Stage Delay (Default: 60 Seconds)
Stage Delay sets the time delay before enabling or disabling a boiler in the Cascade System.
The Stage Delay begins once the Master boiler determines that a boiler must be enabled to
reach the setpoint or when the Master boiler deter-mines a boiler should be disabled because of
a decreasing load.
Figure 18-56: Stage Delay Menu
Press the LEFT or RIGHT buttons to adjust the Stage Delay then press the OK button to store
the setting. Adjusting the Stage Delay will have the following effects:
Increase Stage Delay:
•
Reaching the setpoint could take longer due to a longer delay between enabling boilers.
•
Overshooting the setpoint could occur due to boilers staying on longer before being
disabled.
Decrease Stage Delay:
•
Overshooting the setpoint could occur due to boilers being enabled quicker.
•
Boilers will be disabled quicker, possibly increasing boiler cycling and decreasing runtimes.
========================================================================
18.9.4 Minimum firing Rate (Default: 30%)
Minimum Firing Rate is the minimum firing rate of a single boiler in the Cascade System. The
Master boiler uses this setting to determine when boilers can be enabled and disabled. Setting
the Minimum Firing Rate below the recommended minimum will result in boilers being enabled
too quickly which may cause sharp increases in temperature from the Cascade System. Setting
the Minimum Firing Rate above the recommended minimum will delay the enabling of boilers
which may lower the system efficiency.
Figure 18-57: Minimum Firing Rate Menu
Press the LEFT or RIGHT buttons to adjust the Minimum Firing Rate then press the OK button to
store the setting.
NOTE
The recommended minimum firing
rate for the Esteem 399 is
30%
