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Appendix E Falcon Lead Lag
E-43
LEAD-LAG OPERATION
This is a summary of the functional capability of the embedded lead-lag on the Falcon control. OEM configurable
parameters may be adjusted as part of the OEM factory configuration and in the field using the System Display with
appropriate password permissions.
1. Field Installation Configuration
a. The master and slave controllers are enabled via the Falcon display.
b. All controllers are programmed with a default address of 1. Assuming the Master controller remains address
1, the address of the slave controllers in the system must have a unique address (1..8).
2. Basic Operation
a. Firing rate determination – Parallel common-base limited
(1) All boilers have a single assignable base load firing rate.
(2) Allocation
(a) As load increases:
(i) Until all stages are Firing - No stage is requested to exceed the common base load rate.
(ii)After all stages are Firing - There is no restriction on the slave's commanded firing rate.
(b) As load decreases:
(i) As long as all available stages are firing - There is no restriction on the slave's commanded firing
rate.
(ii)When at least one stage has been dropped - No stage is requested to exceed the common base
load rate.
b. Rotation
(1) The lead boiler is rotated based sequence order. The lead boiler rotation time is a configurable OEM
assigned parameter. Rotation is sequential by address (1-2-3-4; 2-3-4-1; etc.)
(2) Rotation trigger occurs at the start of each new heat cycle.
c. Source of heat for call – The call for heat originates at the master boiler. This source may be configured to be
an external thermostat or via EnviraCOM Remote Stat.
d. Slave boiler lockout – If any slave is in lockout the master boiler will cause it to be skipped and all system
load setting calculation settings will be based only on available boilers.
e. Master boiler lockout – If the master boiler is in lock-out then its burner control function will be skipped in the
rotation the same as the slave controllers. However, the master boiler function will continue to operate.
3. System Component Failure Responses
a. If the system header sensor becomes disconnected from the master boiler then the master boiler will control
off of one of the following OEM configurable actions
(1) Disable - No backup will be used
(a) Lead Outlet - Outlet temperature of the lead boiler will be used as the backup during firing
(i) Slave Outlet Average - Average of the outlet temperatures of all slave boilers that are firing will be
used as a backup
(b) If the sensor chosen by the above parameter is faulty then the backup sensor provided may be used.
When burner demand is off and no burners are firing then, for either "Lead Outlet" or "Slave Outlet
Average", the lead boiler's outlet temperature is used to monitor for burner demand.
4. System Display Configuration – The following parameters are available for OEM configuration and may be
adjusted through a System Display or programmed at the OEM production facility.
Master Falcon Slave Falcon
LL frost protection enable Slave mode
LL frost protection rate Base load rate
Base load rate Slave sequence order
LL CH demand switch LL Demand to firing delay
LL CH set point source
LL Modulation sensor
LL Base load common
LL Modulation backup sensor
LL CH 4mA water temperature
LL Lead selection method
LL CH 20mA water temperature
LL Lag selection method
LL Add stage method 1
LL Add stage detection time 1
LL Add stage error threshold
LL Add stage rate offset
LL Add stage inter-stage delay
LL Drop stage method 1
LL Drop stage detection time 1
LL Drop stage error threshold
LL Drop stage rate offset
LL Lead rotation time
LL Force lead rotation time
LL Drop stage inter-stage delay