GCSS96 Installation Manual

15
ALTERNATE COMBUSTION AIR PROVISION
(Upflow / Horizontal models only)
When using the alternate venting location, either in a hori-
zontal left side down installation or a vertical installation
using down – venting, an alternate combustion air opening
can be used. A locating dimple is located on the right side of
the furnace cabinet. The locating dimple is 1 7/8" mea-
sured from the front edge of the cabinet in line with the
knock out. To use the alternate combustion air location:
1. Remove screws and combustion air flange from
cabinet.
2. Insert cabinet plug in unused combustion air hole.
3. Drill a pilot hole at the cabinet dimple (size dictated
by knockout tool used).
4. Use a knockout tool to create a 3" diameter hole
5. Install combustion air flange and secure with screws
removed in step one.
MODEL
PIPE
SIZE
12345678
2 7570656055504540
3 114 107 100 93 86 79 72 65
2^ 145 140 135 130 125 120 115 110
3 168 161 154 147 140 133 126 119
2 5550454035302520
3 127 120 113 106 99 92 85 78
2
^
30 25 20 15 10 5 N/A N/A
3
^
72 65 58 51 44 37 30 23
2
^
30 25 20 15 10 5 N/A N/A
3
^
72 65 58 51 44 37 30 23
2
^
40 35 30 25 20 15 10 5
3 7265585144373023
2 6055504540353025
3 168 161 154 147 140 133 126 119
2 3025201510 5N/AN/A
3 113 106 99 92 85 78 71 64
2 N/A N/A N/A N/A N/A N/A N/A N/A
3 6558514437302316
2 100 95 90 85 80 75 70 65
3 137 130 123 116 109 102 95 88
2 6055504540353025
3 127 120 113 106 99 92 85 78
2 353025201510 5N/A
3 160 153 146 139 132 125 118 111
2 N/A N/A N/A N/A N/A N/A N/A N/A
3 127 120 113 106 99 92 85 78
7,000 ft altitude or above use 3" pipe
^
*MSS920402BN - add 20' of 2" pipe for upflow position
^
*MSS920803BN - add 10' of 2" pipe for upflow position, add 66' of 3" pipe for upflow position
^
*MSS920804CN - add 25' of 2" pipe for upflow position, add 58' of 3" pipe for upflow position
Number of Elbows
*MSS920402BN
*MSS920603BN
*MSS921004CN
*MSS920803BN
*MSS920804CN
*MSS920805CN
*CSS920804CN
*CSS921005CN
*MSS921005CN
*MSS921205DN
*CSS920402BN
*CSS920603BN
*MSS920403AN
Non-Direct Vent (Single Pipe) Piping
Non-direct vent installations require only a vent/flue pipe. The
vent pipe can be run horizontally with an exit through the side of
the building or run vertically with an exit through the roof of the
building. The vent can also be run through an existing unused
chimney; however, it must extend a minimum of 12 inches above
the top of the chimney. The space between the vent pipe and the
chimney must be closed with a weather-tight, corrosion-resis-
tant flashing.
Although non-direct vent installations do not require a combus-
tion air intake pipe, a minimum of one 90° elbow should be
attached to the furnace’s combustion air intake if: an upright
installation uses the standard intake location, or a horizontal
installation uses the alternate air intake location. This elbow will
guard against inadvertent blockage of the air intake.
VENT/FLUE PIPE LENGTHS AND DIAMETERS
(For Installations At or Above 7,000 Feet using 3” Venting)
NOTE: If either a 90 degree or 45 degree elbow is used for
termination, it must be pointed downward.
Refer to the Direct and Non-Direct Vent Table for applicable
length, elbows, and pipe diameter for construction of the vent/
flue pipe system of a non-direct vent installation. In addition to
the vent/flue pipe, a single 90° elbow should be secured to the
combustion air intake to prevent inadvertent blockage. The tee
used in the vent/flue termination must be included when deter-
mining the number of elbows in the piping system.
MODEL
PIPE
SIZE
12345678
2 7570656055504540
3 114 107 100 93 86 79 72 65
2 100 95 90 85 80 75 70 65
3 168 161 154 147 140 133 126 119
2 4540353025201510
3 168 161 154 147 140 133 126 119
2
^
35 30 25 20 15 10 5 N/A
3 168 161 154 147 140 133 126 119
2 6055504540353025
3 113 106 99 92 85 78 71 64
2 4540353025201510
3 120 113 106 99 92 85 78 71
2 N/A N/A N/A N/A N/A N/A N/A N/A
3 144 137 130 123 116 109 102 95
2 40353025201510 5
3 151 144 137 130 123 116 109 102
2 N/A N/A N/A N/A N/A N/A N/A N/A
3 158 151 144 137 130 123 116 109
2 100 95 90 85 80 75 70 65
3 137 130 123 116 109 102 95 88
2 4540353025201510
3 168 161 154 147 140 133 126 119
2 40353025201510 5
3 120 113 106 99 92 85 78 71
2 N/A N/A N/A N/A N/A N/A N/A N/A
3 113 106 99 92 85 78 71 64
2 N/A N/A N/A N/A N/A N/A N/A N/A
3 110 103 96 89 82 75 68 61
*CSS961205DN
*MSS961205DN
*CSS960402BN
*CSS960603BN
*CSS960804CN
*MSS960804CN
*MSS960805CN
*MSS961005CN
*CSS961005CN
*MSS960803BN
*MSS961004CN
*MSS960603BN
*MSS960402BN
*MSS960403AN