Location; General; Location Relative To Cooling Equipment; Hazardous Locations - Carrier 58UHV Installation, Start-Up, And Operating Instructions Manual

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NOTE: These furnaces are designed for a minimum continuous
return-air temperature of 60°F or intermittent operation down to 55°F
such as when used with a night setback thermostat. Return-air
temperature must not exceed a maximum of 85°F. Failure to follow
these return-air temperature limits may affect reliability of heat
exchangers, motors, and controls.
Step 1—Location

GENERAL

Do not install furnace in a corrosive or contaminated atmo-
sphere. Make sure all combustion and circulating air require-
ments are met in addition to all local codes and ordinances.
Do not use this furnace during construction when adhesives,
sealers, and/or new carpets are being installed and curing. If
the furnace is required during construction, use clean outside
air for combustion and ventilation. Compounds of chlorine
and fluorine, when burned in combustion air, form acids
which will cause corrosion of the heat exchangers and metal
vent system. Some of these compounds are released from
paneling and dry wall adhesives, paints, thinners, masonry
cleaning materials, and many other solvents commonly used
in the construction process.
Excessive exposure to contaminated combustion air will
result in safety and performance related problems.
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Do not install the furnace on its back, safety controls will be
adversely affected. Never connect return-air ducts to sides or
back of furnace. Failure to follow this warning could result in
fire, personal injury, or death.
This furnace must be installed so the electrical components are
protected from water.
Locate furnace as near the center of the air distribution system and
chimney or vent as possible. The furnace should be installed as
level as possible. When a furnace is installed so that supply ducts
carry air to areas outside the space containing the furnace, return
air must also be handled by a duct(s) sealed to the furnace casing
and terminating outside the space containing the furnace.
Provide ample space for servicing and cleaning. Always comply
with the minimum fire protection clearances shown on furnace
°F °F
RETURN
AIR
MAX 85°F MIN 55°F
clearance-to-combustible construction label. This furnace shall not
be installed directly on carpeting, tile, or any combustible material
other than wood flooring.

LOCATION RELATIVE TO COOLING EQUIPMENT

The cooling coil must be installed parallel with or on downstream
side of furnace to avoid condensation in heat exchangers. When
installed parallel with a furnace, dampers or other means used to
control flow of air must prevent chilled air from entering furnace.
If dampers are manually operated, they must be equipped with
means to prevent operation of either unit unless damper is in
full-heat or full-cool position.
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HAZARDOUS LOCATIONS

A93042
When furnace is installed in a residential garage, it must be
installed so that burners and ignition sources are located a
minimum of 18 in. above floor. The furnace must be located
or protected to avoid physical damage by vehicles. When
furnace is installed in a public garage, airplane hangar, or
other building having a hazardous atmosphere, unit must be
installed in accordance with requirements of National Fire
Protection Association, Inc.
Step 2—Air for Combustion and Ventilation
Provisions for adequate combustion and ventilation air must be
provided in accordance with Section 5.3, Air for Combustion and
Ventilation, of the NFGC or applicable provisions of the local
building codes.
Canadian installations must be in accordance with NSCNGPIC
and all authorities having jurisdiction.
Air for combustion must not be contaminated by halogen
compounds, which include fluoride, chloride, bromide, and
iodide. These elements are found in aerosol sprays, deter-
gents, bleaches, cleaning solvents, salts, air fresheners, and
other household products.
All fuel-burning equipment must be supplied with air for combus-
tion of fuel. Sufficient air MUST be provided to ensure there will
not be a negative pressure in the equipment room or space. In
addition, a positive seal MUST be made between furnace cabinet
and return-air duct to prevent pulling air from burner area and draft
safeguard opening into the circulating air.
4
18-IN. MINIMUM
TO BURNERS
A93044