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NOTE: For upflow/downflow applications install furnace so that
it is level or pitched forward within 1/2-in. for proper furnace
operation. For horizontal applications pitch 1/4-in. minimum to
1/2-in. maximum forward to ensure proper condensate drainage
from secondary heat exchangers. (See Fig. 13.)
When a furnace is installed so that supply ducts carry air circulated
by the furnace to areas outside the space containing the furnace,
the return air shall also be handled by duct(s) sealed to furnace
casing and terminating outside the space containing the furnace to
ensure there will not be a negative pressure condition within
equipment room or space.
This furnace may be located in a confined space without special
provisions for dilution or ventilation air.
CAUTION: This gas furnace may be used for construction heat provided that:
-The furnace is permanently installed with all electrical wiring, piping, venting and ducting installed according to these installation
instructions. A return air duct is provided, sealed to the furnace casing, and terminated outside the space containing the furnace. This
prevents a negative pressure condition as created by the circulating air blower, causing a flame rollout and/or drawing combustion
products into the structure.
-The furnace is controlled by a thermostat. It may not be ″hot wired″ to provide heat continuously to the structure without thermostatic
control.
-Clean outside air is provided for combustion. This is to minimize the corrosive effects of adhesives, sealers and other construction
materials. It also prevents the entrainment of drywall dust into combustion air, which can cause fouling and plugging of furnace
components.
-The temperature of the return air to the furnace is no less than 55°F, with no evening setback or shutdown. The use of the furnace while
the structure is under construction is deemed to be intermittent operation per our installation instructions.
-The air temperature rise is within the rated rise range on the furnace rating plate, and the firing rate has been set to the nameplate value.
-The filters used to clean the circulating air during the construction process must be either changed ot thoroughly cleaned prior to
occupancy.
-The furnace, ductwork and filters are cleaned as necessary to remove drywall dust and construction debris from all HVAC system
components after construction is completed.
WARNING: Do not install furnace on its back. Safety
control operation will be adversely affected. Never con-
nect return-air ducts to back of furnace. Failure to follow
this warning could result in fire, personal injury, or death.
(See Fig. 14.)
CAUTION: If these furnaces are installed in an uncon-
ditioned space where the ambient temperatures may be
32°F or lower, freeze protection measures must be taken.
Failure to follow this caution will result in minor property
or unit damage. (See Fig. 15.)
II. FURNACE LOCATION RELATIVE TO COOLING
EQUIPMENT
The cooling coil must be installed parallel with or on downstream
side of furnace to avoid condensation in heat exchanger. When
installed parallel with a furnace, dampers or other means used to
control flow of air shall prevent chilled air from entering furnace.
If dampers are manually operated, they must be equipped with a
means to prevent operation of either unit unless damper is in
full-heat or full-cool position.
Fig. 13—Furnace Location for Proper Condensate
Drainage
A02146
UPFLOW OR DOWNFLOW HORIZONTAL
FRONT
LEVEL (0″)
TO
1
⁄2″ MAX
MIN
1
⁄4″
TO
1
⁄2″ MAX
FRONT
Fig. 14—Prohibit Installation on Back
A93043
FRONT
BACK
FRONT
B
A
C
K
Fig. 15—Freeze Protection
A93058
32°F MINIMUM INSTALLED
AMBIENT OR FREEZE
PROTECTION REQUIRED
—13—
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