8
Clearances and Accessibility
• NOTES:
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.
•
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.
• 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.
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. 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.
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.
DM92SS* MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS
(INCHES)
CARBON MONOXIDE POISONING HAZARD
Failure to follow the steps outlined below for each
appliance connected to the venting system being placed
into operation could result in carbon monoxide poisoning
or death.
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
horizontal pitch, as required by the National Fuel Gas
Code, ANSI Z223.1 or the Natural Gas and Propane
Installation Code, CSA B149.1-15 and these
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 appliance(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
connected 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
accordance with the National Fuel Gas Code ANSI
Z223.1/NFPA 54 and/or National Gas and Propane
Installation Code CSA B149.1-15.
9. 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.
WARNING
