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NOTE: If outside air is installed, the inlet cover should not
be placed in an area where drifting of snow or ice will build
up, blocking the intake air supply.
Hearth & Home Technologies strongly recommends the use
of outside air for all pellet boiler applications.
Per national building codes, consideration must be given
to combustion air supply for all appliances in the vicinity
of the pellet boiler. Failure to supply adequate combustion
air for all appliance demands may lead to backdrafting of
those appliances. Consult with your HVAC Professional to
determine that all combustion air requirements are met.
When the appliance is side-wall vented: The air intake is
best located on the same exterior wall as, and lower 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 Intake Pipe is inside the Rear Cover and to
the right of the feeder motor. The ex pipe is made to slide
inside the Air Intake Pipe. See Fig. 8. It should be held into
place with silicone, foil tape, or a hose clamp. (not supplied)
Negative Pressure and Electrical Power Failure
To reduce the probability of back-drafting or burn-back in the
pellet appliance during a power failure, the appliance 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 ows into
lower levels of the house. Vents and chimneys into basements
and lower levels can become the conduit for air supply and
reverse under these conditions.
The outside air supply will supply most of the demands of
the pellet appliance to resist back-drafting, but consideration
must be given to the total house demand. It may be necessary
to add additional ventilation to the space in which the pellet
appliance is located. Consult with your HVAC professional
to determine the ventilation demands for your house.
Inlet Cover part#
1-10-08542
Fig. 6
Fig. 7
Rear Cover
Outside Air Pipe
Knockout
Feeder Cover
Side Cover
Fig. 8
Outside Air Inlet Pipe
Outside Air
Although strongly recommended, the use of outside
air is optional, except where required by local building
codes. To install outside air, use metal ex pipe, part
# 1-00-08543 (25’ roll) See Fig. 6. There is a break-
away hole on either rear panel which must be removed
before connecting the ex pipe. See Fig. 7. The pipe
should be run outside and terminate 3 feet or more
below or 1 foot or more to the side of the vent pipe
outlet. Never terminate the outside air above the vent
pipe outlet. The maximum length of this pipe is 15
feet. Inlet cover part number 1-10-08542 should be
used to keep birds, rodents etc.out of the inlet pipe.
See Fig.6.