NOTE: Select 1 vent pipe connection and
I combustion-air pipe connection.
AIR
AIRCOMBUSTION- _ COMBUSTION-AIR
VENT _]_
_ _2 72227
UPFLOW
COMBUSTION-
AIR
VENT
"t
HORIZONTAl-LEFT DISCHARGE
NOTE: Select 1 vent pipe connection and
1 combustion-air pipe connection.
V_NT j_[ VENT
AIR AIR AIR
FLOW
DOWNFLOW
COMBUSTION-
AiR VENT
HORIZONTAL-RIGHT DISCHARGE
A96188
[NIT MAY NOT OPERATE
Failu*e to follow this caution may result m intemlittent unit
operation.
Make sure there is adequate clearance (3°in. minhmma) to any
fixed or toose objects in orde* to ensure an adequate
combustion-air supply
Fig. 34_Combustion-Air and Vent Pipe
Connections
HHHH,_, t: IIII
CARBON MONOXIDE POISONING AND PROPERTY
DAMAGE HAZARD
Failure to fbltow this warning could result in property
damage, personal ir_juW, or death.
Vent pipes must be airtight and watertight
NOTE: The mh_imum vent pipe length for these fm'naces is 5 f_
Short pipe lengths (5=8 ft) may discharge water droplets These
droplets may be undesirable, and a 12=in mininmn_ of_get pipe
section is recommended to reduce excessive droplets flora exiting
vent pipe outtet. (See Fig 3g.)
NOTE: Do not count elbows or pipe sections in tem_inations or
within t:umace. See shaded areas in Fig. 40,
FIELD-SUPPLIED
2-IN. DIAMETER ,,--- F ELD-SUPPLED
PVC 90" ELBOW/ 2-IN. DIAMETER
/_" PVC PIPE
_ _1
t II A I,
_LCOMBUSTION-AIR DISC
(FACTORY-SUPPLIED IN
LOOSE PARTS BAG)
A96211
Length of Straight Pipe Portion of
Combustion-Air 1Net Pipe Assembly (In.)
CASBNGWIDTH A
17-112 8-112+ 112
21 10-1/2+ 1/2
24-112 12+ 1/2
Fig. 38--Combustion-Air Inlet Pipe AssemNy
HOUSING
PLUG
INTAKE HOUSING
BURNER
BOX
E_COMBUSTION-
AIR PIPE
A96190
Fig. 36--Air Intake Housing Plug Fitting Drain
NOT IN
HORIZONTAL
SECTION
• FURNACE • £j_
TRANSITION iN
VERTICAL SECTION
A93034
Fig. 37--Vent Pipe Diameter Transition Location
and Elbow Configuration
33
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