Harman PC45 Installation & Operating Manual page 6

ImPOrTANT NOTICE
Only 3 inch or 4 inch Pellet vent (Pl) Pipe may be used.
Fig. 7
Outside air flex pipe
goes here
Termination Cap
Part# 1-10-09542
Fig. 8
NOTE: Simpson duravent Pelletvent Pro harman Adapter
Part #3PvP-Adhb and Pelletvent Pro harman Adapter
Increaser Part #3PvP-X4Adhb are highly recommended
to be installed on the starter collar to insure a proper
pipe connection to the unit.
3-90-02686R29_05/14
+
+
= Positive static pressure
+
= Negative static pressure
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. 7. 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 creates less flow resistance. be sure to use
approved pellet vent pipe wall and ceiling pass through
fittings to go through combustible walls and ceilings. The
starting collar must be secured to the flue collar with a
minimum of two fasteners. Follow vent manufacturer's
instructions for sealing each joint and/or seam.
vent Pipe
Pellet venting pipe (also known as "PL" vent ) is constructed
of two layers with air space between the layers. Some
manufacturers produce PL vent designed specifically for
corn-burning. If planning to burn corn or other grains, be sure
venting system is approved and warranted for corn-burning.
The sections of pipe lock together to form an air tight seal,
however, in some cases a perfect seal is not achieved. For
this reason and the fact that the PC45 operates with a positive
vent pressure we recommend that any interior joints also
be sealed with silicone.
Outside Air
Outside air is optional except in mobile homes and where
building codes require. The benefit of outside air is mainly
noticed in small very tight houses.
To install outside air use 3" flex pipe. 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 3 feet or more to the side or below the vent
pipe outlet. Never terminate the outside air above the vent
pipe outlet. The maximum length run of this pipe is 15 feet.
If a longer run is needed the size must be increased to 3".
Termination Cap part number 1-10-09542 should be used to
keep birds, rodents etc. out of 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.
PC 45 Corn/Pellet Stove 6