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To ensure a safe installation, the two furnaces must not, at any time, run simultaneously. To do so, the thermostat
controlling the existing furnace must be connected to your Mini-Caddy link board. This way, when a heating signal is
sent to the existing furnace, the Mini-Caddy receives the same signal. It will tell the Mini-Caddy to either not start or, to
go into a shut down cycle, if the furnace was already heating when the demand for heat was sent.
The wiring for an Add-on installation is shown below. The existing furnace's thermostat must be connected to the Rh
and Aux terminals of the link board on the Mini-Caddy furnace. Those two wires must come from the R and W
terminals of the existing furnace's thermostat so the link board receives the heat signal.
When a heat signal from the existing furnace's thermostat will be sent, the Mini-Caddy furnace will shut itself down and
an envelope will appear on the LCD screen indicating that the existing furnace has taken over. This envelope will
disappear as soon as the heat signal of the existing furnace's thermostat will stop and the Mini-Caddy furnace will
resume getting orders from its own thermostat.
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