7
paint removers
varnishes
hydrochloric acid
cements and glues
antistatic fabric softeners for clothes dryers
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.)
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.
•
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.
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.
*MSS[92 & 96]* 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.
*CSS[92 & 96]* MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS
(INCHES)
