Carrier 58MXA Installation, Start-Up, And Operating Instructions Manual page 27

NOTE: Select 1 vent pipe connection and
1 combustion-air pipe connection.
AIR
COMBUSTION-AIR _ COMBUSTION-AIR
UPFLOW
COMBUSTION-
AIR
VENT
HORIZONTAL-LEFT DISCHARGE
NOTE: Select 1 vent pipe connection and
1 combustion-air pipe connection.
COMBUSTION- _ COMBUSTION-
AIR AIR
AIR
FLOW
DOWNFLOW
COMBUSTION-
AiR
VENT
HORIZONTAL-RIGHT DISCHARGE
A96187
Fig. 33--Combustion-Air and Vent Pipe
Connections
c. If required per Table 7, insert per%rated disk assembly
(factow_supplied in loose parts bag) in intake housing
where combustion-air intake pipe wilt be connected If half
disk set is require& install with shoulder of disk against
stop in combustionoair inlet
d. Install pipe support (fi_ctoryosupplied in loose parts bag)
into selected fi/mace casing combustion-air pipe hole. Pipe
support should be positioned at bottom of casing hole.
e. Insert 2-in. diameter pipe into intake housing.
NOTE: A 2oin. diameter pipe rmtst be used within the Nmace
casing. Make all pipe diameter transitions outside I:mnace casing.
_ Instal! casing hole tiller plug ([i_ctow-supplied in loose
parts bag) in unused congbustionoair pipe casing hole.
g. Drill a 1/8-in. hole in 2-in. combustion-air pipe using hole
in intake housing as a guide.
h. Install a fieldosupplied No. 6 or No. g sheet metal screw
into combustionoair pipe.
NOTE: DO NOT OVERTIGHTEN SCREW. Breakage of intake
housing or fitting may cause air leakage to occur.
NOTE: Do not attach combustion-air intake pipe permanently to
combustionoair intake housing since it may be necessary- to remove
pipe for service of ignitor or flame sensor.
COMBUSTIONoAIR INTAKE HOUSING PLUG FITTING
The combustion-air intake plug fitting must be installed in unused
combustion-air intake housing. This fitting must be attached by
using RTV sealant, or by &illing a l/g-in, hole in fitting, using
hole in intake housing as a guide. Install a _ield-supplied No. 6 or
No. 8 sheet metal screw.
NOTE: DO NOT OVERTIGHTEN SCREW. Breakage of intake
housing or fitting may cause air leakage to occur
27
A plugged drain connection has been provided on this fitting for
use _hen moisture is found in combustion-air intake pipe and
combustion box.
NOTE: Moisture in cornbustionoair intake may be result of
improper termination. Ensure combustion-air intake pipe termina-
tion is similar to that shown in Fig. 36, 37, 38, 39, and 40 so it will
not be susceptible to areas where light snow or other sources of
moisture could be pulled in.
If use of this drain connection is desire& drill out fitting's tap plug
with a 3/16-in. &ill and connect a field-supplied 3/8-in. tube. This
robe should be routed to open condensate drain for ft_rnace and
AiC (if used), and should be trapped. (See Fig. 35.)
2. Attach vent pipe to ft_rnace as follows:
a. Determine location of vent pipe connection to inducer
housing as shown in Fig. 33 for application.
b. Reposition elastomeric (robber) inducer housing outlet cap
and clamp to appropriate unused inducer housing connec_
don. Tighten clamp.
INIT DAMAGE HAZARD
Failure to follow this caution may result in unit component
damage
Inducer housing outle_ cap must be installed and fktlly
seated against inducer housing. (lamp must be tightened to
prevent any condensate leakage.
c Install pipe support (_i_ctoryosupplied in loose parts bag)
into selected ftmaace casing vent pipe hole. Pipe support
should be positioned at bottom of casing hole
_:l 0-_ '_
INleT DAMAGE HAZARD
Failure to %llow this caution may result in unit component
damage
Vent pipe must be installed and fi/lly seated against inducer
housing internal stop. Clamp must be tightened to prevent any
condensate leakage.
NOTE: A 2-in. diameter pipe must be used within the furnace
casing. Make all pipe diameter transitions outside [:tmaace casing.
d Be certain that mating surfaces of inducer housing connec-
tion, elastomeric coupling, and 2oin diameter vent pipe are
clean and dw Assemble the elastomeric (l_./bber) vent
coupling (with 2 loose clamps) onto inducer housing
connection Insert the 2oin diameter vent pipe through the
elastomeric (rubber) coupling and _ally into inducer hous-
ing connection until it bottoms on the internal stop Tighten
both clamps to secure the pipe to inducer housing Tighten
the clamp screws to 15 in olb. of torque.
e Install casing hole filler plug di_ctoryosupplied in loose
parts bag) in unused combustion-air pipe casing hole.
VENT EXTENSION PIPE
Furnaces with 100,000 Btuh and larger inputs are supplied with a
PVC vent extension pipe (2oin. diameter by 12oin long). This pipe
has a built-in channel to assist vent condensate disposal When this
vent extension pipe is supplied, it must be used to connect the field
vent pipe to _arnace inducer housing on ALL upflow and down-
flow applications
NOTE: See label on vent extension pipe *;or proper installation.
This pipe may be shortened if an elbow is used to connect vent
extension robe to fieldoinstalled vent pipe.