• Base the size of the unit on an acceptable heat loss
calculation for the structure. Use ACCA Manual J or
another approved method.
• When moving or handling the furnace before
installation, always leave the doors on the furnace to
provide support and to prevent damage or warping of
the cabinet. When lifting the furnace by the cabinet,
support the ends of the furnace rather than lifting by
the cabinet flanges at the bottom or side return air
openings or supply air opening.
• When lifting the furnace, you can use the primary
heat exchanger tubes as a lifting point provided that
you lift the tubes at the front of the heat exchangers
where they are attached to the vestibule panel. Do
not use the top return bend of the heat exchangers as
lifting points as the tubes may shift out of position.
Important: Doors must remain on the furnace
when moving or lifting during installation.
Safety requirements
CAUTION
This product must be installed in strict compliance
with the installation instructions and any applicable
local, state, and national codes including, but not
limited to, building, electrical, and mechanical codes.
• Refer to the unit rating plate for the furnace
model number and then see for return air plenum
dimensions. You must install the plenum according to
the instructions.
• Provide clearances from combustible materials as
listed under Table 1.
• Provide clearances for servicing. Ensure to allow
service access for both the burners and the blower.
• These models are not CSA listed or approved for
installation into a HUD Approved Modular Home or a
Manufactured (Mobile) Home.
• This furnace is not approved for installation in trailers
or recreational vehicles.
• Do not install furnaces on combustible flooring
directly on carpeting, tile, or other combustible
material, other than wood flooring.
• Check the rating plate and power supply to be sure
that the electrical characteristics match. All models
use nominal 115 VAC, single-phase, 60 Hz power
supply. Do not connect this appliance to a 50 Hz
power supply or a voltage above 130 V.
• Install the Furnace so that the electrical components
are protected from water.
• Installing and servicing heating equipment can be
hazardous due to the electrical components and the
gas-fired components. Only trained and licensed
personnel must install, repair, or service gas heating
equipment. Unlicensed service personnel can perform
basic maintenance functions such as cleaning and
replacing the air filters. When working on heating
equipment, observe precautions in the manuals and
on the labels attached to the unit ,and other safety
precautions that apply.
Combustion air quality (list of
contaminants)
WARNING
The furnace area must not be used as a broom
closet or for any other storage purposes, as a fire
hazard may be created. Never store items such as the
following on, near, or in contact with the furnace:
Spray or aerosol cans, rags, brooms, dust mops,
vacuum cleaners or other cleaning tools.
Soap powders, bleaches, waxes or other cleaning
compounds, plastic items or containers, gasoline,
kerosene, cigarette lighter fluid, dry cleaning fluids or
other volatile fluid.
Paint thinners and other painting compounds.
Paper bags, boxes or other paper products.
Never operate the furnace with the blower
door removed. To do so could result in serious
personal injury and/or equipment damage.
The furnace requires outdoor air for combustion when
locating the furnace in any of the following environments:
• Buildings with indoor pools
• Chemical exposure
• Commercial buildings
• Hobby or craft rooms
• Laundry rooms
• Installation near chemical storage areas
• Restricted environments
The furnace requires outdoor air for combustion when
the furnace is located in an area where the furnace is
being exposed to the following substances or chemicals:
• Antistatic fabric softeners for clothes dryers
• Carbon tetrachloride
• Cements and glues
• Chlorine based swimming pool chemicals
• Chlorinated waxes and cleaners
• Cleaning solvents such as perchloroethylene
• De-icing salts or chemicals
Installation Manual: RL18 Single-Stage Standard ECM Residential Gas Furnaces (Non-condensing Multi-position Standard
Low NOx)
7
Johnson Controls Ducted Systems
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