FC2500 Furnace Installation and Operation Manual
2- From the thermostat connected to the existing furnace, connect 2 new wire (B) on the R and W terminals of your thermostat and fix them to the terminal identified "I" (interlock) of the parallel Add-On furnace.
PARALLEL ADD-ON FURNACE
EXISTING FURNACE
When the wood furnace receives the signal from the existing furnace thermostat calls for heat, combustion air controls will close slowly, the wood furnace burn rate will reduce to is minimum. After the existing furnace thermostat is satisfied, the wood furnace will return under the control of its own thermostat.
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