Trinity
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Installation and Operation Instructions
Tft Series
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11.0 LEAD LAG INSTRUCTIONS
Multiple Boiler Applications
The Tft controller has the internal capacity to stage or Lead-Lag up to 8 boilers configured in a cascade. This
Lead-Lag capability allows a designated “Master” boiler to communicate with and effectively control each
boiler in a multiple boiler system. This function is accomplished by “Daisy Chaining” a 3-wire cable between
each of the boilers and enabling the Master parameter in the boiler of your choice. The boiler with the Master
parameter enabled becomes the single point of contact for Central Heating, Domestic Hot Water and Outdoor
Reset settings and control wiring. Use the instructions detailed in this section to set-up and install the cascade
boiler system; reference
Appendix A – Controller and Touchscreen Display Instructions
for details on more
advanced settings and for assistance with navigating the touchscreen display.
Figure 11-1 Multiple Boiler Lead-Lag Plumbing Configuration
Water connection locations will
vary between boiler models;
refer to Figures 10-1 to 10-3.
Master Boiler
Tft399 Models Illustrated
