GMEC96 Service Manual

INSTALLATION CONSIDERATIONS
10
carbon tetrachloride
halogen type refrigerants
cleaning solutions (such as perchloroethylene)
printing inks
paint removers
varnishes
hydrochloric acid
cements and glues
antistatic fabric softeners for clothes dryers
and masonry acid washing materials
Isolate a non-direct vent furnace if it is installed near
an area frequently contaminated by any of the above
substances. This protects the non-direct vent furnace
from airborne contaminants. To ensure that the en-
closed non-direct vent furnace has an adequate sup-
ply of combustion air, vent from a nearby uncontami-
nated room or from outdoors. Refer to the Combus-
tion and Ventilation Air Requirements section in this
manual or the installation instructions for details.
If the furnace is used in connection with a cooling
unit, install the furnace upstream or in parallel with
the cooling unit coil. Premature heat exchanger fail-
ure will result if the cooling unit coil is placed in the
return air of the furnace.
If the furnace is installed in a residential garage, po-
sition the furnace so that the burners and ignition
source are located not less than 18 inches (457 mm)
above the floor. Protect the furnace from physical dam-
age by vehicles.
If the furnace is installed horizontally, the furnace ac-
cess doors must be vertical so that the burners fire
horizontally into the heat exchanger. Do not install
the unit with the access doors on the “up/top” or “down/
bottom” side of the furnace.
Clearances and Accessibility
Installations must adhere to the clearances to combustible
materials to which this furnace has been design certified.
The minimum clearance information for this furnace is pro-
vided on the unit’s clearance label. These clearances must
be permanently maintained. Refer to Specification Sheet for
minimum clearances to combustible materials. Clearances
must also accommodate an installation’s gas, electrical,
and drain trap and drain line connections. If the alternate
combustion air intake or vent/flue connections are used on
a 90% furnace, additional clearances must be provided to
accommodate these connections. Refer to Vent Flue Pipe
and Combustion Air Pipe section in this manual or the in-
stallation instructions for details. NOTE: In addition to the
required clearances to combustible materials, a minimum
of 24 inches service clearance must be available in front of
the unit.
A furnace installed in a confined space (i.e., a closet or
utility room) must have two ventilation openings with a total
minimum free area of 0.25 square inches per 1,000 BTU/hr
of furnace input rating. One of the ventilation openings must
be within 12 inches of the top; the other opening must be
within 12 inches of the bottom of the confined space. In a
typical construction, the clearance between the door and
door frame is usually adequate to satisfy this ventilation
requirement.
Furnace Suspension
If suspending the furnace from rafters or joist, use 3/8"
threaded rod and 2”x2”x1/8” angle iron as shown in the fol-
lowing figure. If the furnace is installed in a crawl space it
must also be suspended from the floor joist or supported by
a concrete pad. Never install the furnace on the ground or
allow it to be exposed to water. The length of rod will depend
on the application and the clearances necessary.
POSITION SIDES REAR FRONT BOTTOM FLUE TOP
Upflow 0" 0" 1" C 0" 1"
Horizontal 6" 0" 1" C 0" 4"
MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS
• C = if placed on combustible floor, the floor MUST be wood ONLY.
• For servicing or cleaning, a 24" front cl earance is recomm ended.
• Unit co nnectio ns (electrical, flue, an d drain) may necessitate greater cle arances than the min imum clearance s
liste d abo ve
• In all case, accessibility clearance must take precedence over from the enclosure where accessitility clearances
are greater.
• Approved fo r l ine contact in the ho rizon tal position .