GMEC96 Service Manual

INSTALLATION CONSIDERATIONS
17
NOTE: In Canada, the B149 Fuel Gas Code takes prece-
dence over the preceding termination restrictions.
12"
12"
NON-DIRECT VENT
VENT/FLUE TERMINATION
NO TERMINATIONS
ABOVE WALKWAY
12"
4'
4'
NON-DIRECT VENT
VENT/FLUE TERMINATION
DIRECT VENT
VENT/FLUE TERMINATION
12"
10'
3"
FORCED AIR
INLET
OTHER THAN
COMBUSTION AIR
TERMINATION INTAKE
GRADE OR HIGHEST
ANTICIPATED
SNOW LEVEL
90% Furnace Vent Termination Clearances
WARNING
T
HE RUBBER ELBOW IS NOT DESIGNED TO SUPPORAT A LOAD.
W
HEN THE
RUBBER ELBOW IS MOUNTED EXTERNALLY TO THE FURNACE CABINET,
EXTREME CARE MUST BE TAKEN TO ADEQUATELY SUPPORT FIELD-SUPPLIED
VENT/FLUE PIPING, AS DAMAGE CAN RESULT IN LEAKS CAUSING BODILY
INJURY OR DEATH DUE TO EXPOSURE TO FLUE GASES, INCLUDING CARBON
MONOXIDE.
Vent/Flue Pipe Lengths (Non-Direct Vent) and Diam-
eters
Refer to the following tables for applicable length, elbows,
and pipe diameter for construction of the vent/flue pipe sys-
tem of a non-direct vent installation. In addition to the vent/
flue pipe, a single 90° elbow must be secured to the com-
bustion air intake to prevent inadvertent blockage. The tee
or elbows used in the vent/flue termination must be included
when determining the number of elbows in the piping sys-
tem.
12345678
2or 2 1/ 2 100 95 90 85 80 75 70 65
3 168 161 154 147 140 133 126 119
2
^
or 2 1/ 2
^
50 45 40 35 30 25 20 15
3 143 136 129 122 115 108 101 94
2 o r 2 1/ 2 60 55 50 45 40 35 30 25
3 113 106 99 92 85 78 71 64
2 o r 2 1/ 2 60 55 50 45 40 35 30 25
3 120 113 106 99 92 85 78 71
2 o r 2 1/ 2 45 40 35 30 25 20 15 10
3 103 96 89 82 75 67 60 53
2 o r 2 1/ 2 45 40 35 30 25 20 15 10
3 151 144 137 130 123 116 109 102
*MEC961205DN** 3 185 178 171 164 157 150 143 136
*MEC9 6 Direct Vent (2 - Pipe ) and Non-Di rect Vent (1- Pi pe)
(6 )
Maximum All owable Le ngt h of Vent / Fl ue Pipe
Unit Input (Btu)
Pipe Si ze
(4 )
(i n. )
Number of Elbows
(3 ) (5)
*MEC960302BN**
*MEC960402BN**
*MEC960603BN**
*MEC960803BN**
*MEC960804CN**
*MEC961004CN**
*MEC961005CN**
For installations at 7,000 or above use 3" venting
^ *MEC960603BN - add 45' of 2" pipe for up flow
1) Maximum allowable limits listed on individual lengths for inlet and flue and NOT a combination.
2) Minimum requirement for each vent pipe is five (5) feet in length and one elbow/tee.
3) Tee used in the vent/flue termination must be included when determining the number of elbows in
the piping system.
4) 2 1/2” or 3” diameter pipe can be used in place of 2” diameter pipe.
5) Increased Clearance Configurations using (2) 45 deg. Long Sweep elbows should be consid-
ered equivalent to one 90 deg. elbow.
6) One 90° elbow should be secured to the combustion air intake connection.
12" MINIMUM
VENT/FLUE TEE
OR
90° ELBOW TURNED
DOWN
12" MINIMUM ABOVE
HIGHEST ANTICIPATED
SNOW LEVEL
90% Furnace Horizontal Termination (Single Pipe)
Above Highest Anticipated Snow Level
NOTE: Terminate both pipes in the same pressure zone
(same side of roof, no major obstacles between pipes,
etc.).