SYSTEM OPERATION
6
A copy of the National Fuel Gas Code (NFPA 54/ANSI
Z223.1) can be obtained from any of the following:
American National Standards Institute
25 West 43
rd
Street, 4
th
Floor
New York, NY 10036
National Fire Protection Association
1 Batterymarch Park
Quincy, MA 02169-7471
CSA International
8501 East Pleasant Valley
Cleveland, OH 44131
A copy of the CAN/CGA B149 Installation Codes can be ob-
tained from:
CSA International
178 Rexdale Boulevard
Etobicoke, Ontario, Canada M9W, 1R3
The rated heating capacity of the furnace should be greater
than or equal to the total heat loss of the area to be heat-
ed. The total heat loss should be calculated by an approved
method or in accordance with “ASHRAE Guide” or “Manual
J-Load Calculations” published by the Air Conditioning Con-
tractors of America.
Location Requirements and Considerations
WARNING
To prevent possible equipment damage, personal injury or
death, the following bullet points must be observed when
installing the unit.
Follow the instructions listed below when selecting a fur-
nace location. Refer also to the guidelines provided in the
Combustion and Ventilation Air Requirements
section in this
manual or the installation instructions for details.
•
Centrally locate the furnace with respect to the
proposed or existing air distribution system.
•
Ensure the temperature of the return air entering the
furnace is between 55°F and 100°F when the furnace
is heating.
•
If the furnace is installed in an application where the
typical operating sound level of a furnace is deemed
objectionable, an optional sound reduction kit is
available. Consult your local distributor for more details.
•
Provide provisions for venting combustion products
outdoors through a proper venting system. Special
consideration should be given to vent/flue pipe routing
and combustion air intake pipe when applicable.
•
90% Furnaces:
Refer to
the
Vent/Flue Pipe and
Combustion Air Pipe - Termination Locations
section
in this manual or the installation instructions for
appropriate termination locations. Also for 90%
furnaces, refer to the
Vent/Flue Pipe and Combustion
Air Pipe - Termination Locations
section in this
manual or the installation instructions to determine if
the piping system from furnace to termination can be
accomplished within the guidelines given
. NOTE:
The
length of flue and/or combustion air piping can be a
limiting factor in the location of the furnace.
•
Locate the 90% furnace so that the condensate can be
piped at a downward slope away from the furnace to
the drain. Do not locate the furnace or its condensate
drainage system in any area subject to below freezing
temperatures without proper freeze protection. Refer to
the
Condensate Drain Lines and Trap
section in this
manual or the installation instructions for further details.
•
Set the 90% furnace on a level floor to enable proper
condensate drainage. If the floor becomes wet or damp
at times, place the furnace above the floor on a concrete
base sized approximately 1-1/2” larger than the base of
the furnace. Refer to the
Horizontal Applications and
Considerations
section in this manual or the installation
instructions for leveling of horizontal furnaces.
•
Ensure upflow or horizontal furnaces are not installed
directly on carpeting, or any other combustible material.
The only combustible material allowed is wood.
•
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.
N
OTE:
A subbase will not be
required if an air conditioning coil is located beneath
the furnace between the supply air opening and the
combustible floor.
•
Exposure to contaminated combustion air will result
in safety and performance-related problems. Do not
install the furnace where the combustion air is exposed
to the following substances:
chlorinated waxes or cleaners
chlorine-based swimming pool chemicals
water softening chemicals
deicing salts or chemicals
carbon tetrachloride
halogen type refrigerants
cleaning solutions (such as perchloroethylene)
printing inks
paint removers
varnishes
hydrochloric acid
cements and glues
antistatic fabric softeners for clothes dryers
and masonry acid washing materials
