Combustion-Air Intake Housing Plug Fitting - Carrier 58MVP Installation, Start-Up, And Operating Instructions Manual

UNIT
SIZE
040-14
060-14
080o14
080-20
t00-20
120-20
Table 8--Maximum Allowable Exposed Vent Pipe Length (Ft) With Insulation in Winter Design
W_NTER DESIGN
TEMPERATURE
(°F)
20
0
-20
20
0
-20
20
0
-20
20
0
-20
20
0
-20
Temperature Amb{ent*
MAXIMUM PIPE
DIAMETER
(IN.)
2
2
2
2
2
2
2
2
2
2-112
2-112
2-112
3
3
3
* Pipe length (ft) specified for maximum pipe lengths located in unconditioned spaces.
as specified in Table 7.
? Insulation thickness based on R value of 35 per in.
0
21
10
5
3O
16
9
37
2O
11
41
21
11
49
26
15
INSULATION THICKNESS (IN.}t
St8
37
22
14
55
33
23
65
39
27
70
42
28
70
51
35
112 3/4
42 50
25 30
17 21
6I 70
38 46
26 33
70 70
45 55
31 39
70 70
48 59
33 41
70 70
58 70
40 50
1
57
35
25
7O
53
38
7O
63
45
7O
68
49
7O
7O
59
Pipes located in unconditioned space cannot exceed total allowable pipe length
a. Detem_ine location of combustion-air intake pipe connec-
tion to combustion-air intake housing as shown in Fig 34
fbr application.
b. Reposition comhustion-air intake housing plug fitting in
appropriate unused intake housing connection.
c. Insert perfbrated disk assembly (factoD supplied) in intake
housing where combustion-air intake pipe will be con-
nected.
d. Install pipe support (fi_ctory-supplied in loose parts bag)
into selected fl/rnace casing combustion-air pipe hole. Pipe
support should be positioned to bottom of casing hole.
e. Insert 2-in. diameter pipe into intake housing.
NOTE: A 2-in. diameter pipe nmst be used within the furnace
casing. Make all pipe diameter transitions outside [:urnace casing.
£ Install casing hole filler cap (factory-supplied in loose parts
bag) in unused combustion-air 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 field-supplied No. 6 or No. 8 sheet metal screw
into combustion-air 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 pemaanently to
combustion-air intake housing since it may be necessaD" to remove
pipe for service of igniter or flame sensor.
COMBUSTION-AIR INTAKE HOUSING PLUG FITTING
The combustion-air intake plug fitting nmst be installed in
unused comhustion-air intake housing. This fitdng nmst be
attached by using RFV 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 of intake
housing or fitting may cause air leakage to occur.
A plugged &ain connection has been provided on this fitting
for use when moisture is fbund in combustion-air intake pipe
and combustion box.
NOTE: Moisture in combustion-air intake may be result of
improper terminatiom Ensure combustion-air intake pipe termina-
tion is similar to that shown in Fig. 37. 38.39. 40. or 41 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_ drill and connect a field-supplied 3/8-in.
tube. This tube should be routed to open condensate &ain fbr
fhmace and AiC (if used), and should be trapped. (See Fig.
36.)
2. Attach vent pipe as fbllows:
a. Detem_ine location of vent pipe connection to inducer
housing as shown in Fig. 34 for application.
b. Reposition etastomeric (robber) inducer housing outlet cap
and clamp to appropriate unused inducer housing connec-
tion. Tighten clamp.
3/8" ID TUBE
TRAP![_
TO OPEN .-a
DRAIN
Fig. 36--Intake Housing Plug Fitting Drai_ g3°s5
31