14
7050-145L
August 3, 2018
SANTA FE FREESTANDING
Negative Pressure, Shut-Down and Electrical Power
Failure
To reduce the probability of back-drafting or burn-back
in the pellet appliance during power failure or shut down
conditions, it must be able to draft naturally without exhaust
blower operation.
Negative pressure in the house will resist this natural draft if
not accounted for in the pellet appliance installation.
Heat rises in the house and leaks out at upper levels. This
air must be replaced with cold air from outdoors which
flows into lower levels of the house.
Vents and chimneys into basements and lower levels of the
house can become the conduit for air supply and reverse
under these conditions.
Outside Air
An outside air kit (811-0872) is recommended in all
installations must be ordered separately.
Per national building codes, consideration must be given
to combustion air supply to all combustion appliances.
Failure to supply adequate combustion air for all appliance
demands may lead to back-drafting of those and other
appliances.
When the appliance is roof vented (strongly recommended):
The air intake is best located on the exterior wall
oriented towards the prevailing wind direction during
the heating season.
When the appliance is side-wall vented:
The air intake is best located on the same exterior wall
as the exhaust vent outlet and located lower on the wall
than the exhaust vent outlet.
The outside air supply kit can supply most of the demands
of the pellet appliance, but consideration must be given to
the total house demand.
House demand may consume the air needed for the
appliance. It may be necessary to add additional
ventilation to the space in which the pellet appliance is
located.
Consult with your local HVAC professional to determine the
ventilation demands for your house.
Vent Configurations
When installing a pellet appliance with a horizontal vent
configuration the frequency of power outages should be
considered:
• Power outages during operation will cause the
appliance to immediately turn off and may create
conditions where smoke will back draft into the house.
In order to reduce the likelihood of smoke back drafting
into the house during a power outage, Hearth and
Home Technologies strongly suggests:
• Installing the pellet venting with a minimum vertical
run of 5 feet (1.52m).
• Installing the outside air kit at least 4 feet (1.22m)
below the vent termination.
To prevent soot damage to exterior walls of the house and
to prevent re-entry of soot or ash into the house:
•
Maintain specified clearances to windows, doors and
air inlets, including air conditioners.
•
Vents should not be placed below ventilated soffits.
Run the vent above the roof.
• Avoid venting into alcove locations.
• Vents should not terminate under overhangs, decks or
onto covered porches.
• Maintain minimum clearance of 12 inches (305mm)
from the vent termination to the exterior wall. If you
see deposits developing on the wall, you may need to
extend this distance to accommodate your installation
conditions.
B. Avoiding Smoke and Odors
C. Negative Pressure
Negative pressure results from the imbalance of air
available for the appliance to operate properly. It can be
strongest in lower levels of the house.
Causes include:
• Exhaust fans (kitchen, bath, etc.)
• Range hoods
• Combustion air requirements for furnaces, water
appliances and other combustion appliances
• Clothes dryers
• Location of return-air vents to furnace or air
conditioning
• Imbalances of the HVAC air handling system
• Upper level air leaks such as:
- Recessed lighting
- Attic hatch
- Duct leaks
CAUTION
•
DO NOT CONNECT THIS Appliance TO A CHIMNEY
FLUE SERVICING ANOTHER APPLIANCE.
•
DO NOT CONNECT TO ANY AIR DISTRIBUTION
DUCT OR SYSTEM.
Risk of Asphyxiation!
Negative pressure can cause spillage of combustion
fumes and soot
WARNING
