s,0ewa,,,o,e,Von,andExhau°,-A,rTermination with Exterior Risers
18" Min. for Cold Climates
(Sustained Below 0° F)
8" Min.
12" Min.
Grade or
Inlet Snow Level
Dimension "A" is touching or 2" maximum separation.
Rooftop Inlet Vent and Exhaust-
Air Termination
18" Min. for Cold Climates
(Sustained Below 0° F)
8" Min, \
Inlet 20' Max.
12" Min.
Grade or
Snow Level
/
Exhaust
25-22-43
Recommended Alternate
Installation for Sustained Cold
Weather (-0 ° F & below)
INLET
12" MIN, GroundLevel
_OR__ "_ SnowLevel
FRONT VIEW
Same Joist I
Space
12"
SIDE VlEW
12"
25-23-73
5. Gas Supply and Piping
Poison carbon monoxide gas, fire and explosion
hazard.
Models designated for Natural Gas are to be used
with Natural Gas Only, unless properly converted
to use with LP gas.
Failure to properly vent this furnace can result in
death, personal injury and/or property damage.
BTUH BTUH Natural LP
Standard Alternate Gas Gas
Rating Rating Orifice Orifice
50,000 40,000 #44 #55
75,000 60,000 #44 #55
100,000 80,000 #44 #55
125,000 100,000 #44 #55
NOTE: The rating plate is stamped with the model number, gas
type and gas input rating. In addition, models manufactured for
sale in Canada have orifice size information stamped on the rat-
ing plate.
AlternateBTUHInputRatings (USAOnly)
The inputrating ofthesefurnaces can be changed fromthe stan-
dard input rating to the alternate inputrating shown inTable 5, by
changing the main burner orifices. Changing of burner orifices
MUSTbe done by a qualified servicetechnician. See section on
changing orifices or following page.
SupplyPressure
Fire hazard.
Do NOT set input rating above that shown on
rating plate.
Failure to properly set input pressure can result in
death, personal injury and/or property damage.
1. Supply pressure can be checked using the 1/8" NPT port
on the supply side of the gas valve.
440 01 101004
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