7
the furnace where the combustion air is exposed to the
following substances:
permanent wave solutions
cleaning solutions (such as perchloroethylene)
printing inks
chlorinated waxes or cleaners
paint removers
chlorine-based swimming pool chemicals
varnishes
water softening chemicals
hydrochloric acid
carbon tetrachloride
cements and glues
deicing salts or chemicals
halogen type refrigerants
antistatic fabric softeners for clothes dryers
and masonry acid washing materials
•
Seal off 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 enclosed
non-direct vent
furnace has an adequate
supply of combustion air, vent from a nearby
uncontaminated room or from outdoors. Refer to
the
Combustion and Ventilation Air Requirements
for details.
•
If the furnace is used in connection with a cooling coil
unit, install the furnace upstream or in parallel with the
cooling coil unit. Premature heat exchanger failure will
result if the cooling unit is placed ahead of the furnace.
For vertical (upflow or downflow) applications, the
minimum 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
furnace 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)
a
bove 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.
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 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 subbase instructions for installation
details. Follow the instructions 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.)
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.
DM96VC MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS
(INCHES)
POSITION*
SIDES
REAR
FRONT BOTTOM
FLUE
TOP
Counterflow
0"
0"
3"
NC
0"
1"
Horizontal
6"
0"
3"
C
0"
6"
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.
DC96VC MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS
(INCHES)
TOP
BOTTOM
TOP
BOTTOM
Counterflow
Figure 1
C
LEARANCES
AND
A
CCESSIBILITY
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.
•
In all cases, accessibility clearance must take precedence
over clearances from the enclosure where accessibility
clearances are greater.
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.
