Cleaver-Brooks ClearFire CFLC Series, Operation And Maintenance Manual, Page: 222 / 290

Falcon Lead Lag Appendix E
E-14
Modulation backup sensor (hot water) - this parameter determines the setpoint source (‘backup
sensor’) in the event of a header temperature sensor failure. If Disable is selected then no backup
will be used. If Lead Outlet is selected then the outlet temperature of the lead boiler will be used
as the backup during firing. If Slave Outlet Average is selected then average of the outlet
temperatures of all slave boilers that are firing will be used as a backup.
Table 2b - Lead Lag Master Configuration Parameters - Advanced Settings, Steam
Parameter Range CB Default Setting Installation Setting
Modulation Parameters
Modulation sensor
S1 (J8-4) Steam Sensor
S2 (J8-6) Steam Sensor S2 (J8-6) Steam Sensor
Off hysteresis psi 5
On hysteresis psi 0
Hysteresis step time hr min sec 0 sec
P gain 0-400 10
I gain 0-400 25
D gain 0-400 0
Steam Parameters
Demand switch Stat Terminal
Mod Sensor
Disabled Stat Terminal
Setpoint source Local Local
4-20mA - Not compatible with Falcon steam lead lag.
Setpoint 0-135 psi 10
Time of day setpoint 0-135 psi 0
Algorithms Parameters
Lead selection method Sequence order
Measured run time Sequence order
Lag selection method Sequence order
Measured run time Sequence order
Lead rotation time day hr min 120 hrs
Force lead rotation time day hr min 168 hrs
Rate Allocation Parameters
Base load common 0-100% 75%
Add Stage Parameters
Add stage method Error threshold
Firing rate threshold
Disabled Firing rate threshold
Add stage detection time hr min sec 3 min
Error threshold 0 deg F to 234 deg F (-17 deg C
to 112 deg C) 5 deg F
Rate offset E% 0%
Add Stage interstage delay hr min sec 10 min
Drop Stage Parameters
Drop stage method Error threshold
Firing rate threshold Firing rate threshold
Drop stage detection time hr min sec 2 min
Error threshold psi 3 psi
Rate offset E% -3%
Interstage delay hr min sec 5 min