Section 4 — System Configuration Hawk 1000
4-20 Part No. 750-366
O2 Trim
02 trim control is an integral part of the HAWK 1000 system. This feature affords additional control over fuel-to-
air ratios in the event of adverse atmospheric conditions or fluctuating fuel heating values.
The HMI has an 02 trim screen that displays O2 Actual concentration and O2 Setpoints. The Screen allows for
viewing and calibrating the Cleaver Brooks O2 Sensor (CB) and also
allows for adjustment of PID tuning. The
Flue Gas O2 Control Screen can be accessed from the HMI Main screen.
Low O2 Shutdown
Low 02 Shutdown is a feature that allow the boiler to be shutdown if O2 concentrations become too low.
Low O2 Shutdown can be enabled or disabled b y
toggling “O2 Shutdown” (on the System Configuration
screen)
between
<Yes> and <No>
.
If enabled the Low O2 Shutdown Setpoint and Low O2 shutdown time delay can be adjusted on the alarms
and limits screen.
Hot Standby
The Hot Standby function maintains a minimum water temperature to keep the boiler in a state of readiness
for a load demand. While operating, the boiler
remains at the minimum firing rate and cycles on-and-off
relative to the Hot Standby water temperature set point. This set point is configured on the Setpoints screen
(accessed from the Main Screen).
Hot Standby can be enabled or disabled by Pressing the “Hot Standby” button to toggle between <Yes> and
<No>. The boiler overview and firing rate screens will indicate when the boiler is in hot standby.
Hot Stand-By can be initiated manually by pressing <Force Hot Standby> on the Firing Rate screen. The
boiler will remain in standby until the button is again pressed.
See Section 5 - Commissioning for more on Hot Standby.
Figure 4-19. Flue Gas O2 Control Screen
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