Harman® • XXV-TC Installation Manual_R3 • 2016 -___ • 02/17
16
3-90-00680i
C. Venting & Use of Elbows
Figure 4.11
= Positive static pressure
= Negative static pressure
+
-
+
+
-
+DUPDQSHOOHWVWRYHVGHSHQGRQDFRPEXVWLRQIDQWRSXOODLU
WKURXJKWKHXQLWIRUFRPEXVWLRQ7KHYHQWLQJV\VWHPUHVWULFWV
WKHDELOLW\RIWKHFRPEXVWLRQIDQWRPRYHWKHUHTXLUHGDPRXQW
RIDLUWKURXJKWKHXQLW$V\VWHPZLWKWRRPXFKUHVLVWDQFH
ZLOOUHVXOWLQLQFRPSOHWHFRPEXVWLRQPRUHIUHTXHQWUHTXLUHG
FOHDQLQJ DQG SRRU XQLW SHUIRUPDQFH ,W LV DOZD\V EHVW WR
FKRRVHDORFDWLRQIRUWKHDSSOLDQFHWKDWZLOOUHVXOWLQDYHQWLQJ
V\VWHPZLWKWKHVKRUWHVWHTXLYDOHQWYHQWOHQJWK(9/
,WLVEHVWWRKDYH\RXUYHQWLQJV\VWHPGHVLJQHGE\D+DUPDQ
DXWKRUL]HGGHDOHUEHIRUH\RX¿QDOL]H\RXUSXUFKDVHRIDQ
DSSOLDQFH
Equivalent Vent Length: The equivalent vent length for
common pellet vent components are:
(OERZVRU7HH(9/8QLWV
HOERZ(9/8QLWV
9HUWLFDO3LSHRU/LQHUò(9/8QLW
+RUL]RQWDO3LSHRUOLQHU(9/8QLW
The total allowable equivalent vent length is:
(9/IRU´SHOOHWYHQWSLSHRUOLQHU
(9/IRU´SHOOHWYHQWSLSHRUOLQHU
'XHWRWKHSRWHQWLDOIRUÀ\DVKDFFXPXODWLRQLQKRUL]RQWDO
YHQWLQJVHFWLRQVWKHPD[LPXPSHUPLVVLEOHKRUL]RQWDOYHQWLQJ
OHQJWKLV
IWIRU´ ´SHOOHWYHQWSLSH
Example: First Floor Installation
$XQLWLVWREHLQVWDOOHGXVLQJ´3HOOHW9HQW3LSHZLWK
IHHWRIKRUL]RQWDOSLSHD7HHIHHWRIYHUWLFDOSLSHD
HOERZDQGDWHUPLQDWLRQFDS
The equivalent vent length is:
IWRI+RUL]RQWDO3LSH[(9/
(9/
(OERZRU7HH[(9/
(9/
IWRI9HUWLFDO3LSH[(9/
(9/
(OERZRU7HH[(9/
(9/
7HUPLQDWLRQ&DS
(9/
(TXLYDOHQW9HQW/HQJWK
(9/
,QWKHH[DPSOHV\VWHPGHWDLOHGDERYHWKH(9/ZDV
ZKLFKLVOHVVWKDQWKHPD[LPXPRI(9/IRU´SHOOHW
YHQWSLSHWKXVWKLVLVDVDWLVIDFWRU\YHQWLQJFRQ¿JXUDWLRQ
Example: Connection to Masonry Chimney
$XQLWLVWREHLQVWDOOHGXVLQJ´3HOOHW9HQW3LSHZLWK
IHHWRIKRUL]RQWDOSLSHD7HHIHHWRIYHUWLFDOSLSHDQ
HOERZD7HHIHHWRIYHUWLFDOOLQHUDQGDWHUPLQDWLRQ
FDS
The equivalent vent length is:
IWRI+RUL]RQWDO3LSH[(9/
(9/
7HH[(9/
(9/
IWRI9HUWLFDO3LSH[(9/
(9/
(OERZ[(9/
(9/
7HH[(9/
(9/
IWRI9HUWLFDO/LQHU[(9/
(9/
7HUPLQDWLRQ&DS
(9/
(TXLYDOHQW9HQW/HQJWK
(9/
,Q WKH H[DPSOH V\VWHP GHWDLOHG DERYH WKH (9/ ZDV
ZKLFKH[FHHGVWKHPD[LPXPRIIWIRU´SHOOHW
YHQWSLSHWKXV´YHQWSLSHVKRXOGQRWEHXVHGLQWKLV
LQVWDRZHYHUVLQFH´SLSHFDQVXSSRUWDQ(9/
XSWRWKHXVHRI´SLSHZRXOGFUHDWHDVDWLVIDFWRU\
LQVWDOODWLRQ
