Harman P68 Installation & Operating Manual page 8

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Installation and operating manual (44 pages)

Installation & operating manual (42 pages)

Owner's manual (7 pages)

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iMPOrtant nOtice

Approved Pellet Vent Pipe Such As, Type "L"

Or "PL", Must Be Used.

= Positive Static Pressure

= Negative Static Pressure

P68 Pellet Stove

Fig. 7

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 pres-

sure 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 interior

diameter should be increased from " 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. The use of a starting collar is

not always necessary. The first piece of pipe should

be fastened securely with at least fasteners to the

flue collar of the stove. If a starting collar is used 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 venting pipe (known as 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 1 to 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 P68 operates with a positive vent

pressure we specify that the joints also be sealed

with silicone. Aluminum tape can also be used for

any joint that is 1ft. or more from the outlet of the

stove.

We cannot emphasize enough, the

importance of sealing every seam and joint in the

venting system which is inside the home. Even the

smallest pin hole can leak and when it does you will

smell wood smoke or a creosote smell in the room.

If this occurs check for leaks. Leaks are easiest

to see during start-up. Alternatively you can use a

smoke pellet to leak test the venting before lighting

your first fire.

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