Goodman GMVM Service Instructions Manual page 17

PRODUCT DESIGN
• Exposure to contaminated combustion air will result in
safety and performance-related problems. Do not install
the furnace where the combustion air is exposed to the
following substances:
permanent wave solutions
chlorinated waxes or cleaners
chlorine-based swimming pool chemicals
water softening chemicals
deicing salts or chemicals
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 furnace from an area contaminated
by any of the above substances. This protects the non-
direct vent furnace from airborne contaminants. To ensure
that the enclosed non-direct vent furnace has an adequate
supply of combustion air, vent from a nearby uncontami-
nated room or from outdoors. Refer to the Combustion
and Ventilation Air Requirements for details.
• If the furnace is used in connection with a cooling unit,
install the furnace upstream or in parallel with the cool-
ing coil. Premature heat exchanger failure will result if
the cooling coil is placed upstream of the furnace.
For vertical (upflow or downflow) applications, the mini-
mum cooling coil width shall not be less than furnace
width minus 1". Additionally, a coil installed above an
upflow furnace or under a counterflow furnace may be
the same width as the furnace or may be one size
larger than the furnace. Example: a "C" width coil may
be installed with a "B" width furnace.
For upflow applications, the front of the coil and fur-
nace must face the same direction.
• If the furnace is installed in a residential garage, position
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 damage by vehicles.
• If the furnace is installed horizontally, ensure the access
doors are not on the "up/top" or "down/bottom" side of the
furnace.
• Do not connect this furnace to a chimney flue that serves
a separate appliance designed to burn solid fuel.
• On Counterflow Installations, the air conditioning coil must
be downstream on the supply (positive) side of the furnace
heat exchanger.
• Counterflow Installation over a noncombustible floor. Be-
fore setting the furnace over the plenum opening, ensure
the surface around the opening is smooth and level. A tight
seal should be made between the furnace base and floor
by using a silicone rubber caulking compound or cement
grout.
• Counterflow Installation over a combustible floor. If instal-
lation over a combustible floor becomes necessary, use
an accessory subbase (see Specification Sheet applicable
for your model for details.) A special accessory subbase
must be used for upright counterflow unit installations over
any combustible material including wood. Refer to sub-
base instructions for installation details. Follow the instruc-
tions with the subbase for proper installation.
Do not install the furnace directly on carpeting, tile, or other
combustible material other than wood flooring. (NOTE: The
subbase will not be required if an air conditioning coil is
installed between the supply air opening on the furnace
and the floor.)
C A
LEARANCES AND CCESSIBILITY
*MVM96* MINIMUM CLEARNACE TO COMBUSTIBLE MATERIALS
POSITION* FRONT SIDES
Upflow 3 0
Horizontal Alcove 6
* = All positioning is determined as installed unit is viewed from the front.
C = If placed on combustible floor, floor MUST be wood only.
NC = For installation on non-combustible floors only. A combustible
subbase must be used for installations on combustible flooring.
*CVM96* MINIMUM CLEARNACE TO COMBUSTIBLE MATERIALS
POSITION* FRONT SIDES
Upflow 1 0
Horizontal Alcove 6
* = All positioning is determined as installed unit is viewed from the front.
C = If placed on combustible floor, floor MUST be wood only.
NC = For installation on non-combustible floors only. A combustible
subbase must be used for installations on combustible flooring.
Installations must adhere to the clearances to combustible mate-
rials to which this furnace has been design certified. The mini-
mum clearance information for this furnace is provided on the
unit's clearance label. These clearances must be permanently
maintained. 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
additional clearance must be provided to accommodate these
connections. Refer to Vent/Flue Pipe and Combustion Air Pipe
for details. NOTE: In addition to the required clearances to com-
bustible materials, a minimum of 24 inches service clearance
must be available in front of the unit.
(INCHES)
REAR TOP FLUE FLOOR
0 1 0
0 4 0
(INCHES)
REAR TOP FLUE FLOOR
0 1 0
0 4 0
C
C
NC
C
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