Harman PC45 Installation & Operating Manual page 7

Avoiding Smoke and Odors
Negative Pressure and Electrical Power Failure:
To reduce the probability of back-drafting or burn back in the
appliance during power failure conditions, the appliance must
be able to draft naturally, without operation of the combustion
blower. Negative pressure in the house may resist this natural
draft if not accounted for during the pellet stove 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.
hearth & home Technologies recommends the use of
outside air in all installations, especially lower level and
main floor locations.
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 backdrafting of this and other appliances.
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.
When the appliance is roof vented;
The air intake is best located on the exterior wall oriented
toward the prevailing wind direction, during the heating
season.
The outside air connection will supply all of the demands of
the appliance. However, consideration must be given to the
total house demand. House demand may consume the air
needed for the stove. It may be necessary to add additional
ventilation to the space in which the appliance is located.
Consult with your local HVAC professional to determine the
ventilation demands for your house.
7 pC 45 Corn/pellet Stove
venting
Venting Configurations
To reduce the possibility of reverse drafting during a power
failure, Hearth & Home Technologies strongly recommends:
• Installing the vent pipe with a minimum vertical rise of five
feet, preferably terminating above the roof line.
• Installing outside air with the intake located below the
exhaust termination.
To prevent soot damage to exterior walls of the house, and
to prevent re-entry of smoke, soot, or ash into the house:
• Maintain specified clearances to windows, doors, and
other air inlets, including air conditioners.
• Vents should not be placed below ventilated soffits.
Whenever possible, run the venting above the roof line.
• Avoid terminating the vent in an alcove location.
• Vents should not terminate under overhangs, decks or
onto covered porches.
• Maintain a minimum clearance of 12" 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.
Optional battery back-up
Hearth & Home Technologies supplies an optional battery
back up system to operate the appliance during a loss of
electrical power. Whether you experience frequent power
failures or not, this back up system is recommended.
hearth & home Technologies assumes no responsibility
for, nor does the warranty extend to, smoke damage
caused by reverse drafting of appliances during a power
failure condition.
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