Table of Contents
Advertisement
NOT ACCEPTABLE
Precautions must be taken to prevent condensate from freez-
ing inside the vent pipe. All vent piping exposed to freezing
temperatures must be insulated with 1/2" thick closed cell
foam. Inspect piping for leaks prior to installing insulation.
Pipe Sizing
Consult table 3 to determine what diameter piping is required
for your installation. Lengths shown in table 3 apply to single
pipe & two pipe installations. In a two pipe installation do not
add intake and vent pipe lengths together. Both pipes would
normally be equal in length, if different, then the longest pipe
must be within the limits of table 3. It is preferable to up-size
from 2" to 2.5" or 3" pipe if the pipe length & elbow count are
near maximum. This will help avoid nuisance pressure switch
opening caused by prevailing winds & sudden changes in
atmospheric pressure.
(UP TO 4,999 FT ALTITUDE)
Pipe Size
MODEL
(in)
1
2
95
*MES960403BU
3
103
2
90
*MES960603BU
3
158
2
55
*MES960805CU
3
151
(5,000 - 7,500 FT ALTITUDE)
Pipe Size
MODEL
(in)
1
*MES960403BU
3
100
*MES960603BU
3
100
*MES960805CU
3
80
Vent Pipe Connection
The vent pipe outlet is sized to accept 2" pipe. Secure vent
pipe directly into the furnace fitting with the appropriate
glue. Alternately, a small section of 2" pipe may be glued
in the furnace socket and a rubber coupling installed to
allow removal for future service. Piping should be routed in
a manner to avoid contact with refrigerant lines, metering
devices, condensate drain lines, etc. If necessary, clearances
NO TRANSITION ON
HORIZONTAL PLANE,
THIS CREATES A
WATER TRAP AND
RESTRICTS FLUE
GASES
Figure 6
Number of Elbows
2
3
4
5
6
90
85
80
75
70
96
89
82
75
68
85
80
75
70
65
151
144
137
130
123
50
45
40
35
30
144
137
130
123
116
Number of Elbows
2
3
4
5
6
93
87
81
75
69
93
87
81
75
69
73
67
61
55
49
TABLE 3
may be increased by creating an offset using two 45° elbows
(Figure 7).
E
DGES OF SHEET METAL HOLES MAY BE SHARP
PRECAUTION WHEN REMOVING HOLE PLUGS
Combustion Air Pipe Connection
If the furnace is being installed without a combustion air pipe,
a 90° elbow should be used on the combustion air intake to
guard against blockage.
On up flow / horizontal models, secure the combustion
7
8
air intake pipe to the air intake coupling using a rubber
65
60
coupling supplied with the furnace. The rubber coupling may
61
54
be omitted by inverting the intake coupling and gluing pipe
60
55
directly to it. Piping may also be glued to the intake coupling
116
109
in its original position by using a plastic coupling.
25
20
109
102
7
8
63
57
63
57
43
37
12
Increased Clearance Configuration
Figure 7
WARNING
. U
.
VENT-DRAIN
Figure 8
SE GLOVES AS A
Hide quick links:
Advertisement
Table of Contents
