GMVC9 GCVC9 Installation Instructions

12
PREFERRED
Figure 4
TRANSITION NO LESS
THAN 45 DEGREES TO
HORIZONTAL PLANE TO
AVOID CREATING A WATER
TRAP IN VENT PIPING.
ACCEPTABLE
Figure 5
NO TRANSITION ON
HORIZONTAL PLANE,
THIS CREATES A
WATER TRAP AND
RESTRICTS FLUE
GASES
Figure 6
Some models require the use of 3” pipe. Do not transition
from a 2” to 3” pipe in a horizontal section of pipe as this
may create a water trap.
Piping must be adequately secured and supported to prohibit
sagging, joint separation, and/or detachment from the furnace.
Horizontal runs of vent/flue piping must be supported every
three to five feet and must maintain a 1/4 inch per foot down-
ward slope, back towards the furnace, to properly return con-
densate to the furnace’s drain system. Allowances should be
made for minor expansion and contraction due to temperature
variations. For this reason, particular care must be taken to
secure piping when a long run is followed by a short offset of less
than 40 inches.
Precautions should be taken to prevent condensate from freez-
ing inside the vent/flue pipe and/or at the vent/flue pipe termi-
nation. All vent/flue piping exposed to freezing temperatures
below 35°F for extended periods of time must be insulated with
1/2” thick closed cell foam. Also all vent/flue piping exposed
outdoors in excess of the terminations shown in this manual (or
in unheated areas) must be insulated with 1/2” thick closed cell
foam. Inspect piping for leaks prior to installing insulation.
TERMINATION LOCATIONS
Non-Direct Vent
Vent/Flue Termination
No Terminations
Above Walkway
4'
min.
Non-Direct Vent
Vent/Flue Termination
Direct Vent
Vent/Flue Termination
Forced Air
Inlet
Non-Direct Vent
&
Direct Vent
Vent/Flue Terminations
Grade or Highest
Anticipated
Snow Level
12" min.
4' min.
12" min.
Vent Termination Clearances
Figure 7
NOTE: Refer to Location Requirements and Considerations for
combustion air contaminant restrictions.
The following bullets and diagram describe the restrictions con-
cerning the appropriate location of vent/flue pipe and combus-
tion air intake pipe (when applicable) terminations. Refer to
Non-Direct Vent (Single Pipe) Piping and Direct Vent (Dual Pipe)
Piping located in this section for specific details on termination
construction.
• All terminations (flue and/or intake) must be located
at least 12 inches above ground level or the anticipated
snow level.
• Vent terminations (non-direct and direct vent) must
terminate at least 3 feet above any forced air inlet
located within 10 feet.
NOTE: This provision does not apply to the combustion
air intake termination of a direct vent application.