Harman Stove Company Accentra-2 Installation And Operating Manual page 14

bustion gases from the firebox. This causes a nega-
tive pressure in the firebox and a positive pressure in
the venting system as shown in fig. 22. The longer the
vent pipe and more elbows used in the system, the
greater the flow resistance. Because of these facts
we recommend using as few elbows as possible and
15 feet or less of vent pipe. The maximum horizontal
run should not exceed 48". If more than 15 feet of pipe
is needed, the diameter should be increased from 3"
to 4" because a larger pipe causes less flow resis-
tance. Be sure to use approved pellet vent pipe
wall and ceiling pass- through fittings t o go
through combustible walls and ceilings. Be sure to
use a starting collar to attach the venting systen to the
stove. The starting collar must be sealed to the
stove with high temp silicone caulking.
Pellet venting pipe (also known as PL vent is con-
structed of two layers with air space between the lay-
ers. This air space acts as an insulator and reduces
the outside surface temperature to allow a clearance
to combustibles of only 3 inches. The sections of pipe
lock together to form an air tight seal in most cases;
@
=
Positive static pressure
however, in some cases a perfect seal is not achieved.
For this reason and the fact that the Accentra oper-
ates with a positive vent pressure, we specify that
the joints also be sealed with clear silicone.
Connection Ports
connecting the flex pipe. The pipe should be run out-
side and terminate to the side or below the vent pipe
outlet so the flue outlet is more than 12" from the inlet
cover. 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
Direct Vent Wall
used to keep birds, rodents, etc.out of pipe.
You may choose to use the optional Direct Vent
Wall Passthrough Kit (part #I-00-677077) which in-
corporates venting passthrough and outside air into
one component. See Fig. 24b.
When installing in a house with a Heat Reclaiming
Ventilation System (HRV) be sure the system is balanced
and is not creating a negative pressure in the house.
I
Fig. 24
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