Carrier 58MEB Installation, Start-Up, And Operating Instructions Manual page 37

Ensure combustion air pipe termination is similar to those as
shown in Fig. 42 so that it will not be susceptible to area where
light snow or others sources of moisture could be pulled in.
NOTE: Select 1 vent pipe connection and
1 combustion-air pipe connection.
AIR
FLOW
COMBUSTION- COMBUSTION-
AIR AIR
VENT
VENT
*
†
UPFLOW
COMBUSTION-
AIR
VENT
**
AIR
FLOW
†
† †
HORIZONTAL-LEFT DISCHARGE
* For Non-Direct Vent (1-Pipe) system, orient elbow so that its
opening faces down.
** For Non-Direct Vent (1-Pipe) system, orient elbow so that its
opening faces sideways.
† An external trap kit (see furnace product data sheet) must be used.
† †
Bottom combustion-air not allowed for non-direct vent
Fig. 37 - - Combustion-Air and Vent Pipe Connections
FIELD-SUPPLIED
2-IN. (51 mm) DIA.
PVC 90° ELBOW
COMBUSTION-AIR DISC
(FACTORY-SUPPLIED IN
LOOSE PARTS BAG)
Length of Straight Pipe Portion of
Combustion-Air Inlet Pipe Assembly --- In. (mm)
CASING WIDTH
17---1/2 (445)
21(533)
24---1/2 (622)
Fig. 38 - - Combustion-Air Inlet Pipe Assembly
NOTE: Select 1 vent pipe connection and
1 combustion-air pipe connection.
VENT
VENT
*
†
COMBUSTION- COMBUSTION-
AIR AIR
AIR
FLOW
DOWNFLOW
COMBUSTION-
AIR
VENT
**
AIR
FLOW
† †
†
HORIZONTAL-RIGHT DISCHARGE
A05092
FIELD-SUPPLIED
2-IN. (51 mm) DIA.
PVC PIPE
A
A96211
A
8---1/2 ±1/2 (216 ± 13)
10---1/2 ±1/2 (267 ± 13)
12 ±1/2 (318 ± 13)
NOTE: Ensure combustion air pipe termination is similar to
those as shown in Fig. 44 so that it will not be susceptible to area
where light snow or other sources of moisture could be pulled in.
VENT PIPE
General
Furnace vent connection must be attached as shown in Fig. 37.
WARNING
!
CARBON MONOXIDE POISONING AND PROPERTY
DAMAGE HAZARD
Failure to follow this warning could result in property damage,
personal injury, or death.
Vent pipes must be airtight.
NOTE: A 2- -in. (51 mm) diameter pipe must be used within the
furnace casing. Make all pipe diameter transitions outside furnace
casing per Fig. 39.
The minimum vent pipe length for these furnaces is 5 ft. (1.5 M).
Short pipe lengths (5-8 ft (1.5- -2.4 M)) may discharge condensate
droplets. These condensate droplets may be undesirable. A 12- -in.
(305 mm) minimum offset pipe section is recommended to reduce
excessive condensate droplets from exiting vent pipe outlet. (See
Fig. 41)
Attachment of Vent Pipe
1. Determine vent pipe diameter and maximum pipe lengths
using Table 11.
NOTE: (Direct Vent/2-Pipe ONLY) vent pipe system has the
same diameter and same length as combustion air pipe as
mentioned in section "Assembly of Combustion Air Pipe (Direct
Vent/2-Pipe system ONLY)."
NOTE: Do not count elbows or pipe sections in terminations or
within furnace (all elbows shown in Fig. 42 and Fig. 43 are not
be counted).
2. Determine location of vent pipe connection to inducer
housing as shown in Fig. 37 for application.
3. Reposition elastomeric (rubber) inducer housing outlet cap
and clamp to appropriate unused inducer housing
connection. Tighten clamp.
WARNING
!
CARBON MONOXIDE POISONING AND PROPERTY
DAMAGE HAZARD
Failure to follow this warning could result in personal injury or
death.
Inducer housing outlet cap must be installed and fully seated
against inducer housing. Clamp must be tightened to prevent
any condensate leakage.
4. Install pipe grommet (factory-supplied in loose parts bag)
into selected furnace casing vent pipe hole.
5. Be certain that mating surfaces of inducer housing
connection elastomeric (rubber) coupling, and 2- -in. (51
mm) diameter vent pipe are clean and dry. Assemble the
elastomeric (rubber) vent coupling (with 2 loose clamps)
onto inducer housing connection. Insert the 2- -in. (51 mm)
diameter vent pipe through the elastomeric (rubber)
coupling and fully into inducer housing connection until it
touches a stop inside the inducer housing outlet. Tighten
the screws on both clamps to 15-in-lb. of torque. pipe to
inducer housing. Tighten the clamp screws to 15 in.-lb. of
torque.
NOTE: Starting at furnace, slope vent pipe a minimum of
1/4-in.(6 mm) per linear ft with no sags between hangers.
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