Carrier 58MXA - Page 25

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attached by using RTV sealant, or by drilling a 1/8-in. hole in

fitting, using hole in intake housing as a guide. Install a

field-supplied No. 6 or No. 8 sheet metal screw.

NOTE: DO NOT OVERTIGHTEN SCREW. Breakage to intake

housing or fitting may cause air leakage to occur.

A plugged drain connection has been provided on this fitting

for use when moisture is found in combustion-air intake pipe

and combustion box.

NOTE: Moisture in combustion-air intake may be result of

improper termination. Ensure combustion-air intake pipe is similar

to that shown in Fig. 31, 32, 33, 34, or 35 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 desired, drill out fitting’s tap

plug with a 3/16-in. drill and connect a field-supplied 3/8-in.

tube. This tube should be routed to open condensate drain for

furnace and A/C (if used), and should be trapped. (See Fig.

30.)

2. Attach vent pipe as follows:

a. Determine location of vent pipe connection to inducer

housing as shown in Fig. 28 for application.

b. Reposition neoprene inducer housing outlet cap and clamp

to appropriate unused inducer housing connection. Tighten

clamp.

Inducer housing outlet cap must be installed and fully seated

against inducer housing. Clamp must be tightened to prevent

any condensate leakage. Failure to follow this warning could

result in electrical shock, fire, personal injury, or death.

c. Install pipe support (factory-supplied in loose parts bag)

into selected furnace casing vent pipe hole. Pipe support

should be positioned at bottom of casing hole.

d. Insert 2-in. diameter pipe into inducer housing through

neoprene coupling and clamp in inducer housing. Tighten

clamp.

Vent pipe must be installed and fully seated against inducer

housing. Clamp must be tightened to prevent any condensate

leakage. Failure to follow this warning could result in

electrical shock, fire, personal injury, or death.

NOTE: A 2-in. diameter pipe must be used within the furnace

casing. Make all pipe diameter transitions outside furnace casing.

VENT EXTENSION PIPE

Some furnaces are supplied with a PVC vent extension pipe

(2-in. diameter by 12-in. 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 furnace inducer housing on ALL upflow and

downflow applications.

NOTE: See label on vent extension pipe for proper installation.

This pipe may be shortened if an elbow is used to connect vent

extension tube to field-installed vent pipe.

3. Working from furnace to outside, cut pipe to required

length(s).

4. Deburr inside and outside of pipe.

5. Chamfer outside edge of pipe for better distribution of primer

and cement.

Table 5—Maximum Allowable Pipe Length (Ft) Continued

ALTITUDE UNIT SIZE

TERMINATION

TYPE

PIPE DIA

(IN.)*

NUMBER OF 90° ELBOWS

1234 5 6

9001 to 10,000‡

040-08

040-12

2 Pipe or 2-In.

Concentric

1-1/2 42 37 32 27 25 20

2 57555351 49 47

060-08

060-12

060-16

2 Pipe or 2-In.

Concentric

2 45403833 31 29

080-12

080-16

080-20

2 Pipe or 2-In.

Concentric

2 302514 9 7 NA

2-1/2 57 55 53 51 49 47

100-16

100-20

2 Pipe or 3-In.

Concentric

2-1/2 21 13 5 NA NA NA

3 54494439 34 29

120-20

2 Pipe or 3-In.

Concentric

3† one disk 18 16 14 9 7 5

3† no disk 39 37 35 33 31 29

* Disk usage—Unless otherwise specified, use perforated disk assembly (factory-supplied in loose parts bag). If stated, separate 2 halves of perforated disk assembly

and use shouldered disk half or no disk assembly.

† Wide radius elbow.

‡ Vent sizing for Canadian installations over 4500 ft (1370 m) above sea level are subject to acceptance by the local authorities having jurisdiction.

NA—Not Allowed; pressure switch will not make.

NOTES: