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7
A combustion blower is used to extract the combustion
gases from the rebox. This causes a negative pressure
in the rebox and a positive pressure in the venting
system as shown in g. 6. The longer the vent pipe
and more elbows used in the system, the greater the
ow 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 ow resistance. Be sure
to use approved pellet vent pipe wall and ceiling
pass through ttings to go through combustible
walls and ceilings. Be sure to use a starting collar to
attach the venting system to the stove. The starting
collar must be sealed to the stove with high temp
silicone caulking.
Vent Pipe
Pellet vent pipe (known as type "L" or "PL" vent) is
constructed of two layers with air space between the
layers. 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;
however, in some cases a perfect seal is not achieved.
For this reason and the fact that the P61 operates with
a positive vent pressure we specify that the joints
also be sealed with high temp silicone.
Outside Air
Outside air is optional except in mobile homes and
where building codes require. The benet of outside air
is mainly noticed in small very tight houses.
To install outside air use 2 3/8" I.D. ex pipe part
number 1-00-08543 (25 ft.). There is a break-away
hole on the rear panel which must be removed before
connecting the ex pipe. The pipe should be run outside
and terminate to the side or below the vent pipe outlet
so the ue 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 used to
keep birds, rodents etc. out of the pipe.
HRV
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.
Inlet Cover part#
1-10-08542
Flex pipe part #
1-00-08543 (25 ft.)
Venting
IMPORTANT NOTICE
Pellet Vent "L" or "PL" Vent Pipe Must be used.
Fig. 7
Outside air ex
pipe goes here
The Harman Direct Vent Wall
Passthrough allows the proper
protection of the wall and
brings outside air to the stove
with one component. Part #
1-00-677077 is all you need.
(ts only 3" pellet pipe)
Fig. 6
+
+
= Positive static pressure
= Negative static pressure
+
-