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•
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.
Before 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 installation over a combustible floor becomes
necessary, use an accessory sub-base (see
Specification Sheet applicable for your model for
details.) A special accessory sub-base must be used
for upright counterflow unit installations over any
combustible material including wood. Refer to sub-
base instructions for installation details. Follow the
instructions with the sub-base for proper installation.
Do not install the furnace directly on carpeting, tile, or
other combustible material other than wood flooring.
(NOTE: The sub-base will not be required if an air
conditioning coil is installed between the supply air
opening on the furnace and the floor.)
*M9S96* & *M9S92* Minimum Clearances To Combustible Materials (Inches)
Position*
Sides
Rear
Upflow
0"
0"
Horizontal
6"
0"
C = If placed on combustible floor, floor MUST be wood only.
*C9S96* Minimum Clearances To Combustible Materials (Inches)
Position*
Sides
Rear
Counterflow 0"
0"
Horizontal
6"
0"
C = If placed on combustible floor, floor MUST be wood only.
NC = For installations on non-combustible floors only. A combustible subbase must be
used for installations on combustible flooring.
TOP
SIDE
SIDE
BOTTOM
Upflow
Figure 1
Front
Bottom
Flue
3"
C
0"
3"
C
0"
Front
Bottom
Flue
3"
NC
0"
3"
C
0"
TOP
SIDE
BOTTOM
Counterflow
Horizontal
CLEARANCES AND ACCESSIBILITY
NOTES:
•
For servicing or cleaning, a 24" front clearance is
required.
•
Unit connections (electrical, flue and drain) may
necessitate greater clearances than the minimum
clearances listed above.
•
Clearance in accordance with local installation
codes, the requirements of the gas supplier and the
manufacturer's installation instructions.
•
Dégaugement conforme aux codes d'installation
locaux, aux exigences du fournisseur de gaz et aux
instructions d'installation du fabricant.
•
In all cases, accessibility clearance must take
precedence over clearances from the enclosure
where accessibility clearances are greater.
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
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.
Top
1"
NOTE: In addition to the required clearances to
6"
combustible materials, a minimum of 24 inches
service clearance must be available in front of the unit.
Top
A furnace installed in a confined space (i.e., a closet or utility
1"
room) must have two ventilation openings with a total minimum
6"
free area of 0.25 square inches per 1,000 BTU/hr of furnace
input rating. Refer to Specification Sheet applicable to your
model for minimum clearances to combustible surfaces. 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.
Existing Furnace Removal
NOTE: When an existing furnace is removed from
a venting system serving other appliances, the
venting system may be too large to properly vent the
remaining attached appliances.
The following vent testing procedure is repro duced from
the American National Standard/National Standard
of Canada for Gas-Fired Central Furnaces ANSI Z21.47,
CSA-2.3 latest edition Section 1.23.1.
9
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