Themaximumventlength,regardlessofpipediameter,is
30'(10m)plusamaximumofuptothree(3)90°longradius
or"sweep"elbows.Iffewerthanthreeelbowsareused,
maximumventlengthisstill30'(10m).
A12"(300mm)minimumto18"(450mm)maximumsection
ofsinglewall26gauge(.134"[.86mm])minimumgalva-
nizedorstainlesssteelisrequiredattheventcollarofthe
furnacepriortoconnectionoftheplasticventpipe.Use3"
diameterfor50,000through125,000Btuhinputmodels
and4"diameterfor150,000Btuhinputmodels.
4. Minimumof18"(450mm)ventfromthefurnaceconnector
isrequiredbeforethefirst90°elbow.
Maintaina4"(102mm)minimumairspacetocombustibles
fromallsectionsoftheventsystem,exceptwhereawall
thimbleisusedforhorizontalventing,orasallowedbylocal
ornationalcodes.
Aplasticteeventoutletwithscreenforventterminationis
requiredtobespacedadistanceof8" fromtheexterior
wall.Ifpossible,thewallthroughwhichtheventwillpass
shouldnotbeexposedtotheprevailingwind.Ifthisisnot
possible,stepstoprotecttheventterminationfromstrong
windsshouldbeconsidered,suchasafenceorahedge.
Vent Termination
3.
4.
The venting system shall terminate at least 4' (1220mm)
below, 4' (1220mm) horizontally from, or 1, (300mm) above
any door, window, or gravity air inlet into any building. The
vent tremination shall be located at least 4' (1220mm) hori-
zontally from any electric meter, gas meter, regulator, and
any relief equipment. These distances apply only to U.S.
installations.
The vent termination shall terminate at least 3' (914mm)
above any forced air inlet located within 10' (3.1m). See
Figure 5.
Figure 5 Vent Termination Clearances
(United States Only, )
See Canadian Fuel Gas Code _ 0therThan
0ther Than
Direct Vent
Terminal
\
OtherThan
Direct Vent Forced Air
Terminal Intet
Vent Termination Clearances
10-11-36
The vent termination must be located at least 12" (300mm)
above ground or normally expected snow accumulation
levels.
Do NOT terminate over public walkways. Avoid areas
where condensate may cause problems such as above
planters, patios, or adjacent to windows where steam may
cause fogging.
5. In Canada, the Canadian Fuel Gas Code takes precedence
over the preceding termination instructions.
Venting Through a Non-Combustible and Combustible
Wall
Please consult Thermoplastic vent manufacturer for proper meth-
od of venting througn a non-combustible and combustible wall.
5. GasSupplyandPiping
Fire and explosion hazard.
Natural Gas
Models designated for Natural Gas are to be used
with Natural Gas ONLY.
Failure to follow these instructions can result in
property damage, personal injury and/or death.
Table 2
Gas Pressures
Gas Manifold
Type Min. Pressure
Natural 4.5" 3.5"
(1.1 kPa) (0.9 kPa)
Propane 11" t 0"
(2.7 kPa) (2.5 kPa)
Supply Pressure
Recommended Max.
7" 14"
(1.7 kPa) (3.5 kPa)
11" 14"
(2.7 kPa) (3.5 kPa)
NaturalGas Input Rating Check
Gas Supply Requirements
• Use only the Type of gas approved for this furnace. See rat-
ing plate for approved gas type.
• Gas input must not exceed the rated input shown on the rat-
ing plate. Overfiring will result in failure of heat exchanger
and cause dangerous operation.
• Do not allow minimum supply pressure to vary downward.
Doing so will decrease input to furnace. Refer to Table 2 for
Gas supply and manifold pressures.
/SJ
The gas meter can be used to measure input to furnace. Rating is
based on a natural gas BTU content of 1,000 BTU's per cubic foot.
Check with gas supplier for actual BTU content.
1. Turn OFF gas supply to all appliances other than furnace
and start furnace.
2. Time how many seconds it takes the smallest dial on the
gas meter to make one complete revolution. Refer to Ex-
ample.
Note: If meter uses a 2 cubic foot dial divide results (se-
conds) by two.
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