Drolet HEATPRO DF03000 Installation And Operating Instructions Manual page 36

HeatPro Furnace Installation and Operation Manual
Example of thermostat wiring:
Connect one wire to "HR" and
the other wire to "W". The red
jumper can be left in place. For
more information, refer to the
manufacturer's instructions.
This furnace may be installed in
parallel as an add-on to an
existing furnace in the USA only.
Such an installation requires that
the furnace's
interlocked to prevent
furnaces from
maximum rate simultaneously.
In order to interlock the furnaces,
connect the wires
existing furnace's
normally R and W, to the terminal
identified "INTERLOCK" located
next to the thermostat terminal of
the HeatPro.
When the wood furnace receives
the signal from the existing
furnace's thermostat calling for
heat, it will disconnect
damper motor, sending the wood
furnace in low burn until the call
for heat from that thermostat is
satisfied.
After the existing
thermostat is satisfied, the wood
furnace will return under the
control of its own thermostat.
Use in thermostat mode
To ensure the proper operation of the air inlet damper while connected to a thermostat, the
manual control switch must be maintained in the closed position. However, when a
thermostat is connected to the furnace, it is still possible to use the manual control switch
to open the air damper if desired. Even though you chose to control the furnace with a
thermostat it is still possible to use the manual control switch to open the air intake damper
if desired.
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controls be
both
heating at
from the
thermostat,
the
furnace's