Falcon Lead Lag Appendix E
E-26
Isolation Valve Control
At each Slave use Aux 1 Pump control block for isolation valve control (see Figure 17). Assign to
Pump B relay. Also assign Boiler Pump control block (see Figure 14) to Pump B relay. Wire isolation
valve open/close to Falcon Pump B relay terminals.*
System Pump Enable (optional)
At Master, use System Pump enable (Figure 13).** Assign Pump C. Wire pump enable to Falcon
Pump C relay terminals.
*This configuration will ensure that as long as Falcon Lead Lag is enabled, the lead boiler isolation valve will
remain open. When Lead Lag is disabled, any programmed overrun times will continue for their full duration.
**Falcon Lead/Lag control sends only an Enable signal to the system pumps. Any system pump operational
control (pump lead lag, standby, rotation, etc.) is by others.
Figure 14 - Primary Pumping
Boiler 1 Boiler 2
RETURN
to boilers
SUPPLY
to system
System pumps -
controlled by others
Boiler isolation valve
L/L MASTER
System pump
ENABLE signal
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