Carrier Series 100 Installation, Start-Up, And Operating Instructions Manual page 34

NOTE: Select 1 vent pipe connection and
1 combustion-air pipe connection.
AIR
FLOW
COMBUSTION- COMBUSTION-
AIR AIR
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.
→
Fig. 37—Combustion-Air and Vent Pipe
Connections
FIELD-SUPPLIED
2-IN. DIAMETER
PVC 90° ELBOW
COMBUSTION-AIR DISC
(FACTORY-SUPPLIED IN
LOOSE PARTS BAG)
Length of Straight Pipe Portion of
Combustion-Air Inlet Pipe Assembly (In.)
CASING WIDTH
17-1/2
21
24-1/2
Fig. 38—Combustion-Air Inlet Pipe Assembly
40 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.
VENT
VENT
COMBUSTION- COMBUSTION-
AIR
AIR
FLOW
DOWNFLOW
COMBUSTION-
AIR
VENT
**
†
HORIZONTAL-RIGHT DISCHARGE
FIELD-SUPPLIED
2-IN. DIAMETER
PVC PIPE
A
A
8-1/2 ± 1/2
10-1/2 ± 1/2
12 ± 1/2
→
VENT PIPE
General
Furnace vent connection must be attached as shown in Fig. 37.
VENT
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.
AIR
NOTE: A 2-in. 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. Short pipe
lengths (5-8 ft) may discharge condensate droplets. These conden-
sate droplets may be undesirable. A 12-in. minimum offset pipe
section is recommended to reduce excessive condensate droplets
AIR
from exiting vent pipe outlet. (See Fig. 41)
FLOW
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 men-
tioned 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
A05092
as shown in Fig. 39 for application.
3. Reposition elastomeric (rubber) inducer housing outlet cap
and clamp to appropriate unused inducer housing connection.
Tighten clamp.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in unit component
damage.
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. diameter vent pipe are
clean and dry. Assemble the elastomeric (rubber) vent cou-
pling (with 2 loose clamps) onto inducer housing connection.
A96211
Insert the 2-in. 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.
per linear ft with no sags between hangers.
34