8
P P 38+ P e l l e t S t o ve
3-90-08422R34_08/13
Ven t i n g
Ven t i n g
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 interior diameter should be increased from 3" to
4" because a larger pipe causes less flow resistance.
Be s u r e
t o u s e a p p r o ved p el l et ven t p i p e w a l l a n d c ei l i n g p a s s -
through fittings to go through combustible walls and
c ei l i n g s . Al l j o i n t s f o r c o n n ec t o r p i p e m u s t b e f a s t en ed
w i t h a m i n i m u m o f t h r ee s c r ew s a n d a t er m i n a t i o n c a p
m u s t b e i n s t a l l ed . Fo l l o w p el l et ven t m a n u f a c t u r er
i n s t r u c t i o n s f o r p r o p er l y s ec u r i n g ea c h p el l et ven t j o i n t .
Th e p el l et s t a r t i n g c o l l a r m u s t b e s ec u r ed t o t h e u n i t ' s
flue collar.
A CH iMNEY CONNECTOR MAY NOT PASS TH ROUGH
AN ATTiC OR ROOF SPACE, CLOSET OR SiMiLAR
CONCEALED SPACE, FLOOR , OR CEiLiNG. REFERENCE
LOCAL BUiLDiNG CODES FOR DETAiLS.
iMPORTANT NOTiCE
Approved 3" or 4" Pellet Vent Pipe Such As, Type "PL",
Must Be Used.
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Fi g . 7
Ven t Pi p e
Pellet venting pipe (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 1 to 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 unit operates
with a positive vent pressure
w e s p ec i f y t h a t t h e j o i n t s
a l s o b e s ea l ed w i t h h i g h t em p ( RTV) s i l i c o n e.
Aluminum
tape can also be used for any joint that is 1ft. or more from
the outlet of the stove.
NOTE: Si m p s o n Du r a Ven t Pel l et Ven t Pr o H a r m a n Ad a p t er
Pa r t # 3PVP- ADH B a n d Pel l et Ven t Pr o H a r m a n Ad a p t er
in c r ea s er Pa r t # 3PVP- X 4ADH B a r e h i g h l y r ec o m m en d ed
t o b e i n s t a l l ed o n t h e s t a r t er c o l l a r t o i n s u r e a p r o p er
p i p e c o n n ec t i o n t o t h e u n i t .
iNSTALL VENT AT CLEARANCES SPECiFiED BY TH E
VENT MANUFACTURER
DO NOT iNSTALL A FLUE DAMPER iN TH E EX H AUST
VENTiNG SYSTEM OF TH iS UNiT.
DO NOT CONNECT TH iS UNiT TO A CH iMNEY FLUE
SERViNG ANOTH ER APPLiANCE
Avo i d i n g Sm o k e a n d Od o r s
Neg a t i ve Pr es s u r e, Sh u t - d o w n , a n d Po w er Fa i l u r e:
T
o r ed u c e t h e p r o b a b i l i t y o f b a c k - d r a f t i n g o r b u r n - b a c k i n
t h e p el l et b u r n i n g a p p l i a n c e d u r i n g p o w er f a i l u r e o r s h u t -
d o w n c o n d i t i o n s , t h e s t o ve m u s t b e a b l e t o d r a f t n a t u r a l l y
without exhaust blower operation. Negative pressure in the
house will resist this natural draft if not accounted for in the
pellet appliance installation.
Heat rises in the house and leaks out at upper levels. This air
must be replaced with cold air from outdoors, which flows into
lower levels of the house. Vents and chimneys into basements
and lower levels of the house can become the conduit for air
supply, and reverse under these conditions.
Ou t s i d e Ai r :
H ea r t h & H o m e Tec h n o l o g i es s t r o n g l y r ec o m m en d s
a t t a c h i n g o u t s i d e a i r i n a l l i n s t a l l a t i o n s , es p ec i a l l y l o w er
level and main floor locations.
CAUTiON
DO NOT USE MAK ESH iFT COMPROMiSES W H EN
iNSTALLiNG TH iS APPLiANCE. DAMAGE AND/ OR
iNJURY MAY RESULT.
= Positive Static Pressure
= Negative Static Pressure
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