GMEC96 Service Manual

INSTALLATION CONSIDERATIONS
18
• The vent termination of vent pipe run vertically through
a roof must terminate at least 12 inches above the
roof line (or the anticipated snow level) and be at least
12 inches from any vertical wall (including any antici-
pated snow build up).
• A vent termination shall not terminate over public walk-
ways or over an area where condensate or vapor could
create a nuisance or hazard or could be detrimental
to the operation of regulators, relief valves, or other
equipment.
• The combustion air intake termination of a direct vent
application should not terminate in an area which is
frequently dusty or dirty.
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
40,000
2
or 2 1/ 2
120 115 110 105 100 95 90 85
60,000
2
or 2 1/ 2
95 90 85 80 75 70 65 60
80,000 "B" 2 or 2 1/ 2 75 70 65 60 55 50 45 40
80,000 "B" 3 200 193 186 179 172 165 158 151
80,000 "C" 2 or 2 1/ 2 25 20 15 10 5 N/ A N/ A N/ A
80,000 "C" 3 200 193 186 179 172 165 158 151
100,000 2 or 2 1/ 2 25 20 15 10 5 N/ A N/ A N/ A
100,000 3 200 193 186 179 172 165 158 151
120,000 2 or 2 1/ 2 45 40 35 30 25 20 15 10
120,000 3 95 90 85 80 75 70 65 60
*MEC96 Di rect Ve nt (2 - Pipe) and Non-Di rect Ve nt (1 - Pi pe )
(6)
Maximum Allow able Lengt h of Vent/ Flue Pipe
& Combust ion Air Pipe (ft )
( 1) (2 )
Unit Input
(Bt u)
Pipe Size
(4)
(i n. )
Number of Elbow s
(3) (5 )
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