Harman XXV Pellet Stove Installation & Operating Manual page 10

Inlet Cover part#
1-10-08542
Fig. 7
Adjustable from 4 1/2" to
10 5/8" wall thickness
Fig. 8
direct Vent wall Passthrough
The Harman Direct Vent Wall Passthrough (Part
# 1-00-677077) makes installing your Harman Pellet
Stove with outside air easier. It combines the needed
wall protection for the venting, with a source of intake
air for combustion. It is made to fit walls from 4 1/2" to
10 1/8" thick with a single square opening in the wall
of 6-1/2 inches.
canadian Standard, ulc-S627-00 requires that all out-
door-aired appliances must be secured to the structure.
10
XXV Pellet Stove
Outside air flex pipe
goes here.
Flex pipe part#
1-00-08543 (25')
Outdoor Half
Indoor Half
Venting
avoiding Smoke and Odors
negative Pressure, Shut-down, and Power Failure:
To reduce the probability of back-drafting or
burn-back in the pellet burning appliance during
power failure or shut-down conditions, the stove
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:
harman home heating and hearth & home
technologies strongly recommend attaching
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 back-drafting
of those 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 towards the
prevailing wind direction during the heating season.
The outside air connection will supply the demands of
the pellet appliance, but consideration must be given to
the total house demand. House demand may consume
some air needed for the stove, especially during a power
failure. 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.
To install outside air use 2 3/8" I.D. non-combustible
flex pipe. There is a break-away hole on the rear panel
of the stove which must be removed to connect the flex
pipe. The maximum length run of this pipe is 15 feet. If
a longer run is needed the size must be increased to
3". Inlet cover part number 1-10-08542 should be used
to keep birds, rodents, etc.out of the pipe unless the
Harman wall passthrough is being used.