7
POSITION*
SIDES
REAR
FRONT BOTTOM
FLUE
TOP
Upflow
0"
0"
3"
C
0"
1"
Horizontal
6"
0"
3"
C
0"
6"
C = If placed on combustible floor, floor MUST be wood only.
*MES96 MINIMUM CLEARANCES
TO COMBUSTIBLE MATERIALS (INCHES)
TABLE 1
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 per
-
manently 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 combustible
materials, a minimum of 24” 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. Refer to Specification Sheet applicable to your model for
minimum clearances to combustible surfaces. One of the venti
-
lation openings must be within 12” of the top; the other opening
must be within 12” 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.
TOP
BOTTOM
TOP
BOTTOM
Figure 1
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 reproduced 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.
The following steps shall be followed with each appliance
connected to the venting system placed in operation, while
any other appliances connected to the venting system are
not in operation:
1. Seal any unused openings in the venting system.
2. Inspect the venting system for proper size and horizon
-
tal pitch, as required by the National Fuel Gas Code,
ANSI Z223.1 instructions. Determine that there is no
blockage or restriction, leakage, corrosion and other
deficiencies which could cause an unsafe condition.
3. As far as practical, close all building doors and windows
and all doors between the space in which the appli
-
ance(s) connected to the venting system are located
and other spaces of the building.
4. Close fireplace dampers.
5. Turn on clothes dryers and any appliance not connect
-
ed to the venting system. Turn on any exhaust fans,
such as range hoods and bathroom exhausts, so they
shall operate at maximum speed. Do not operate a
summer exhaust fan.
6. Follow the lighting instructions. Place the appliance
being inspected in operation. Adjust thermostat so
appliance shall operate continuously.
7. Test for spillage from draft hood appliances at the draft
hood relief opening after 5 minutes of main burner
operation. Use the flame of a match or candle.
8. If improper venting is observed during any of the above
tests, the venting system must be corrected in accor
-
dance with the National Fuel Gas Code ANSI Z223.1/
NFPA 54.
8. After it has been determined that each appliance
connected to the venting system properly vents when
tested as outlined above, return doors, windows,
exhaust fans, fireplace dampers and any other gas
burning appliance to their previous conditions of use.
If resizing is required on any portion of the venting system, use
the appropriate table in the latest edition of the National Fuel
Gas Code ANSI Z223.1 Installation Codes.
Thermostat Location
The thermostat should be placed approximately five feet from
the floor on a vibration-free, inside wall in an area having good
air circulation. Do not install the thermostat where it may be
influenced by any of the following:
• Drafts, or dead spots behind doors, in corners, or under
cabinets.
• Hot or cold air from registers.
• Radiant heat from the sun.
• Light fixtures or other appliances.
• Radiant heat from a fireplace.
• Concealed hot or cold water pipes, or chimneys.
• Unconditioned areas behind the thermostat, such as
an outside wall.
Consult the instructions packaged with the thermostat for
mounting instructions and further precautions.
