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5.17 ADD-ON INSTALLATION
As mentioned in Section 5.5 Parallel installation, it is permitted to make a parallel installation, in the United
States only, of your Caddy Alterna II with an existing furnace by respecting the conditions stated in Section 5.5
Parallel installation.
To ensure a safe installation, both furnaces must never run at the same time. To do so, the thermostat
controlling the existing furnace must be wired to the Caddy Alterna II furnace link board. This way, when a heat
signal is given to the existing furnace, the Caddy Alterna II furnace will receive the same signal which will tell it to
stop. If, on the other hand, the Caddy Alterna II thermostat sends a heat signal to the Alterna II furnace, the
signal from the existing furnace's thermostat will override the Caddy Alterna II thermostat heat signal which will
prevent both furnaces to run at the same time.
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 Caddy Alterna II 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 Caddy Alterna II 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
Caddy Alterna II furnace will resume getting orders from its own thermostat.
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