Carrier 58MTB Installation, Start-Up, And Operating Instructions Manual page 35

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. 38—Combustion-Air and Vent Pipe
Connections
Table 11A—Furnace Setup Switch Description
SETUP
SWITCH NORMAL
SWITCH
NAME POSITION
NO.
Adaptive
SW-1 Heat OFF
Mode
Blower
SW-2 OFF ON or OFF
delay
Blower
SW-3 OFF ON or OFF
delay
Table 11B—Blower Off Delay Setup Switch (SW)
2–Stage Units with PSC Blower Motors
DESIRED HEATING MODE
BLOWER-OFF DELAY (SEC)
90
120
150
180
NOTE: (Direct Vent/2-Pipe ONLY) vent pipe system has the
same diameter and same length as combustion air pipe as men-
NOTE: Select 1 vent pipe connection and
1 combustion-air pipe connection.
VENT
VENT
VENT
COMBUSTION- COMBUSTION-
AIR AIR
AIR
FLOW
DOWNFLOW
COMBUSTION-
AIR
VENT
**
†
HORIZONTAL-RIGHT DISCHARGE
DESCRIPTION
OF
USE
When off, allows 2-stage operation with a
single-stage thermostat.
Turn on when using 2-stage
thermostat to allow Low Heat
operation when R to W/W1 closes
and High Heat operation when
R to W/W1 and W2 close.
Control blower OFF
delay time. Used in
conjunction with SW-3.
See Table 9B.
Control blower OFF
delay time. Used in
conjunction with SW-2.
See Table 9B.
SETUP SWITCH
SW-2
OFF
OFF
ON
ON
*
COMBUSTION-AIR DISC
(FACTORY-SUPPLIED IN
LOOSE PARTS BAG)
Length of Straight Pipe Portion of
Combustion-Air Inlet Pipe Assembly (In.)
AIR
CASING WIDTH
FLOW
Fig. 39—Combustion-Air Inlet Pipe Assembly
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. 44 and Fig. 45 are not be
counted).
2. Determine location of vent pipe connection to inducer housing
A05092
as shown in Fig. 38 for application.
3. Install vent pipe grommet (factory-supplied in loose parts bag)
into selected furnace casing vent pipe hole. (See Fig. 44.)
4. 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.
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.
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
SW-3
to inducer housing. Tighten the clamp screws to 15 in.-lb. of
OFF
torque.
ON
NOTE: Starting at furnace, slope vent pipe a minimum of 1/4-in.
OFF
per linear ft with no sags between hangers.
ON
35
FIELD-SUPPLIED
2-IN. DIAMETER
FIELD-SUPPLIED
PVC 90° ELBOW
2-IN. DIAMETER
PVC PIPE
A
17-1/2
10-1/2 ± 1/2
21
24-1/2
A96211
A
8-1/2 ± 1/2
12 ± 1/2