HearthStone Quality Home Heating Products Inc
Tucson
Model #8700
16
confirm that the vent is unobstructed. The
vent can not be connected with a flue
serving a solid fuel appliance. It however,
can be installed to a flue serving another gas
or oil appliance, so long as it is in
accordance with the National Fuel Gas
Code.
Type B-1 vent pipe is intended primarily for
installation inside buildings to provide an
essentially vertical passageway for flue
gases from the vented gas appliance to the
outside air. When it is impractical to install
B-1 vent pipe inside a building, it may be
installed outdoors provided that it is: 1)
certified for outside installation, 2) installed
in accordance with manufacturer’s
installation instructions and 3) adequately
chased (enclosed) and insulated (per
Venting Tables, Category I-Central
Furnaces, AGA and GAMA current edition;
Standards for Gas Vents, National Standards
of Canada and CAN/CGA-B149.1-M91).
Exterior B-1 vent pipe passing through an
unused masonry chimney flue is not
considered to be exposed to the outdoors.
Four-inch flexible pipe can be used in place
of B-1 vent pipe wherever it is impractical
or impossible to install rigid Type B-1 vent
pipe. However, flexible pipe is less
desirable than B-1 vent pipe, because there
is a greater heat loss along the length of flex
pipe, which may produce an unacceptable
draft
Draft Hood/Down Draft Sensor/Spill
Switch
The Tucson has a draft hood as part of its
rear assembly. The draft hood must not be
altered or obstructed. The Tucson must be
installed so that the draft hood is in the same
atmospheric pressure zone as the
combustible air inlet for the unit. The
Tucson cannot and must not be connected to
an outside air source; the unit must take its
combustion air from the living space in
which it is installed. The draft hood is
equipped with a safety shutoff down draft
sensor switch (spill switch), which is located
in the draft hood just beneath the flue collar
on the rear of the unit. This switch is
designed to sense a loss of draft within the
chimney. The down draft sensor switch is
wired in series with the pilot thermocouple
and is typically in the closed position.
Should the Tucson fail to establish or lose
draft while in operation, hot exhaust gasses
will spill into the room through the bottom
of the draft hood instead of exiting the draft
hood via the flue collar and venting to the
outdoors. When this undesirable down draft
condition occurs the hot gasses spilling out
of the draft hood will heat the spill switch
causing it to open, which turns the unit off.
Do not modify, disconnect or otherwise
defeat the purpose of the down draft sensor
switch. If your stove shuts off during
normal operation, it is indicative of an
unsafe venting condition, which must be
corrected. Operation of this unit when not
properly connected to a properly installed
and maintained venting system or tampering
with the vent safety shutoff system can
result in carbon monoxide (CO) poisoning
and possible death.
Power Venting
For applications where it is impractical or
impossible to exit B-1 vent pipe to above the
existing roof line, the Tucson can be vented
using a power vent. A power vent is
essentially a specialized electric fan
mounted on the outer wall of the building,
which is connected to the heater via the flue
pipe. When the thermostat calls for heat, the
power vent turns on and creates a draft in
the flue pipe similar to the draft created by a
properly functioning conventional chimney.
