Cleaver-Brooks ClearFire CFLC-5000 - INSTALLATION AND STARTUP

Appendix E Falcon Lead Lag
E-3
Falcon Lead Lag control provides sequencing and staging for up to 8 boilers using Falcon controllers
linked over the Falcon Lead Lag Modbus network. This manual includes:
• Installation and Startup instructions for ClearFire boiler lead lag applications.
• Lead Lag Operation reference manual containing operation details and in-depth descriptions of
Falcon lead lag control algorithms and parameters.
•Modbus reference with details on Falcon Modbus setup and implementation, included lead lag
network setup, building EMS communications, and Modbus register maps
Before a lead lag control network can be established, individual boilers must be properly installed
and commissioned. For information refer to the latest revision of the appropriate boiler manual:
750-263 Model CFC ClearFire Condensing Boiler
750-296 Model CFW ClearFire Hydronic Boiler
750-363 Model CFLC ClearFire Large Condensing Boiler
750-295 Model CFH ClearFire Steam Boiler
750-269 Model CFV ClearFire Vertical Steam Boiler
Review especially the sections pertaining to multiple boiler installations.
See also the latest revisions of:
750-265 Falcon Boiler Control
750-241 Falcon Display/Operator Interface
750-308 Falcon Modbus
750-244 Falcon Program Module (PIM)
INSTALLATION AND STARTUP
1- INTRODUCTION
The Falcon boiler control in conjunction with Cleaver-Brooks’ ClearFire line of commercial boilers provides a
reliable and efficient solution for facilities requiring a modular, multiple-boiler system. The Falcon is uniquely
capable of taking advantage of the ClearFire’s characteristic combustion and thermal performance profiles,
apportioning the load to individual boilers so as to maximize overall system efficiency.
<Color>Figure 1 shows efficiency data for the ClearFire CFC condensing boiler. Note that the CFC operates
most efficiently at low fire (20% firing rate). While different model ClearFire boilers will differ somewhat in
their operational characteristics, all share a tendency to reach peak efficiencies at lower firing rates. The
Falcon lead lag routine uses a modulation scheme based on a user-selectable common base load rate, which
when properly configured will provide optimum load response and efficiency for any Model ClearFire lead lag
network.