GMES96-U Installation Manual

12
E DGES OF SHEET METAL HOLES MAY BE SHARP . U SE GLOVES AS A
PRECAUTION WHEN REMOVING HOLE PLUGS .
WARNING
C OMBUSTION A IR P IPE
DIRECT VENT INSTALLATIONS
On upflow units secure the combustion air intake pipe to the air
intake coupling by using a take apart rubber coupling supplied
with the furnace or a plastic coupling. Also, the intake cou-
pling may be inverted to allow the intake pipe to be glued
directly to it. After inverting the coupling, secure it to the
furnace top with screws.
VENT-DRAIN
Figure 8B
COMBUSTION AIR INTAKE OPTIONS: The RF000142 coupling
(Figure 8B) can be secured directly to the furnace intake
coupling if condensation/rain water is a concern. If the
RF000142 is used on the combustion air inlet, it must be
installed with the arrow pointing up. It should be noted, the
combustion air will actually be moving in a direction oppo-
site of the arrow on the RF000142 coupling. It must have a
field supplied, trapped drain tube free-draining to proper
condensate disposal location. A loop in the drain tube can
serve as a trap. The unused RF000142 drain fitting should
be capped. A tee installed in the intake pipe is also an ac-
ceptable method of catching condensation. It must have a
field supplied, trapped drain tube or pipe, free-draining to
proper condensate disposal location. A loop in the drain tube
can serve as a trap.
Combustion Air
Exhaust
Figure 8C
• The vent termination of a direct vent application must
terminate at least 12" from any opening through which
flue gases may enter a building (door, window, or gravity
air inlet).
• The vent termination of vent pipe run vertically through
a roof must terminate at least 12" above the roof line
(or the anticipated snow level) and be at least 12" from
any vertical wall (including any anticipated snow build
up).
• A vent termination shall not terminate over public
walkways 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.
STANDARD FURNACE CONNECTIONS
It is the responsibility of the installer to ensure that the piping
connections to the furnace are secure, airtight, and adequately
supported.
VENT/FLUE P IPE
The vent pipe outlet is sized to accept 2" pipe. Secure vent/
flue pipe directly into the furnace fitting with the appropri-
ate 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. Combustion Air and Vent piping
should be routed in a manner to avoid contact with refriger-
ant lines, metering devices, condensate drain lines, etc. If
necessary, clearances may be increased by creating an off-
set using two 45° elbows (Figure 8A).
Increased Clearance Configuration
Figure 8A
This joint can be rotated on the fitting to establish maxi-
mum clearance between refrigerant lines, metering devices,
and condensate drain lines, etc. This joint is the equivalent
of one 90° elbow when considering elbow count.
NOTE: For non-direct vent installations, a minimum of one
90° elbow should be installed on the combustion air intake
coupling to guard against inadvertent blockage. Figure 8A