Northline Express EXHAUSTO RS 12, Applications Manual

Page: 18 / 35

Fan Motor
(Thermally
protected)
Motor speed
control
120 volt, single phase, 60 Hz,
Power Supply
M
two sheet metal screws. Run a 1/4" tube (copper or
aluminum) from the switch and insert the into the side
of the chimney through the mounting bracket.
For the switch, select a location where the tem-
perature is within the limits of the switch. Mount the
switch in a vertical position and follow the adjustment
directions later in this Section.
Sequence of operation:
1. The chimney fan is turned ON prior to starting
the gas-fired heating appliance.
2. Operation will close the pressure switch and
activate (open) the Solenoid Gas Valve located
between the gas-tank/main gas supply and the
burner.
3. The fan speed, and thereby the draft, is
controlled manually by adjustments made
to the motor speed control.
4. Any interruption of the draft causing the draft to
fall below the pressure switch setting will open
the pressure switch and de-activate the Sole-
noid Gas Valve.
Chimney
Section
Fig. 24
Fan Proving Switch
Low Pressure Port
Fig. 23
Probe
Wiring Diagram for chimney fan
controlled by motor speed control.
This is wiring diagram for the fan.
Sequence of operation:
1. The chimney fan is turned ON prior to
starting heating appliance.
2. The fan speed, and thereby the draft, is
controlled manually by adjustments made
to the motor speed control.
3. When the fire in the heating appliance has
died out, the fan can be turned OFF.
Wiring diagram for chimney fan
controlled by motor speed control and
fan proving switch.
For applications using natural gas or LP gas as
fuel, a fan proving switch should be used.
The wiring of the system is shown below, but
attention must be paid to the installation and location
of the probe connected to the fan proving switch.
For the probe (fig. 23), drill a hole in the side of
the chimney, attach the mounting plate over it with the
EXHAUSTO
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