There are three insulated wires in a 12/3 wire; red, black and white plus an
uninsulated ground wire.
Either terminal on the pump can be connected to the black or white wire.
White
is common and also goes to fan/blower
Black wire from the pump runs to house, to fan inside existing furnace.
Red
(from 110V source) goes to top terminal on thermostat
Ground
(Bare copper wire) is attached to furnace frame and to the green
ground screw on both the pump and fan.
Bottom terminal on thermostat goes to fan. Run a new single piece of wire between
thermostat and fan. (Shown here and in diagram below as an individual black wire).
FAN SWITCH: You can utilize a standard outdoor light switch in this line, to turn the
fan off while refueling the furnace. Simply wire it in the power line to the thermostat
or between the thermostat and fan, using an approved outdoor electrical box and
cover, to code. See page 28 for picture. A 3-way switch could be used with a reminder
light to let you know that the fan is off.
This furnace must be wired by a qualified electrician
in accordance with the National or/and County/State Electrical Code.
Running Pump 24/7
You can also wire up the
pump to run 24/7, instead
of on demand as shown.
In this case, you only
need a 12/2 wire, with
ground.
Simply run the hot wire to
the pump and to the
thermostat.
Common goes to the
other terminal on the
pump and to the fan.
Ground goes to boiler
frame.
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