Venting - Harman Stove Company Accentra Installation & Operating Manual

ImPOrTANT NOTICE
3 or 4 inch Pellet Vent Pipe -
(Type PL) Must be used.
Fig.22
-
= Positive static pressure
+
- = Negative static pressure
Fig. 23
25' Flex pipe
(part # 1-00-08543)
Inlet Cover
(part # 1-10-08542)
Fig. 24

venting

+
+
Room Sensor
Connection Ports
Outside air flex pipe
goes here
3" PL vent
pipe flue collar
Direct Vent Wall
Passthrough Kit
(part #1-00-677077)
Fig. 24b
venting
A combustion blower is used to extract the combustion
gases from the firebox. This causes a negative 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 resistance. be sure to
use approved pellet vent pipe wall and ceiling pass-
through fittings 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 secured to the heater with a minimum of
three fasteners. The screws provided are a self-drilling
type of screw. However, due to material thickness,
drilling a 3/32" pilot hole is recommended for each
screw. You may also wish to seal this connection with
RTV silicone caulking.
vent Pipe
Pellet venting pipe (also known as 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 Accentra operates
with a positive vent pressure, we specify that the joints
also be sealed with high-temp silicone.
Outside Air
Connection to outside air is strongly recommended. It
is required for all mobile home installations, and where
building codes require.
To install outside air use 2 3/8" I.D. flex pipe, part
number 1-00-08543 (25 feet). There is a break-away
hole on the rear panel which must be removed before
connecting the flex pipe. The pipe should be run outside
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 used to
keep birds, rodents, etc. out of the pipe.
You may choose to use the optional Direct Vent
Wall Passthrough Kit (part #1-00-677077) which
incorporates venting passthrough and outside air into
one component. See Fig. 24b.
15