12
3-90-233R24_11/13
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 flex 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 flows
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
Installation
Fig. 6
Fig. 7
Outside Air
Pipe knockout
Feeder Cover
rear Cover
Side
Cover
Outside Air
Although strongly recommended, the use of outside air is
optional, except where required by local building codes.
There is a break-away hole on either rear panel which must
be removed before connecting the flex 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.
during a loss of electrical power the hopper lid
must be kept in a closed and latched position.
Opening the lid while the combustion blower is
non-operational will allow smoke into the home and
potential overheating of the hopper and fuel. This
can lead to a fire in the hopper.
Fig. 8
Outside Air Inlet Pipe
