Reznor EEDU Unit Installation Manual - Manual (Page 3)

Form I-EEDU, P/N 150492 R6, Page 3
1.4 Installation
Codes
The duct furnaces covered in this manual are design-certified by the Canadian Stan-
dards Association for commercial/industrial use in both the United States and Canada.
The furnaces are approved for use with either natural gas or propane. The type of gas
for which the furnace is equipped, the correct firing rate, and electrical characteristics
are shown on the unit rating plate.
These units must be installed in accordance with local building codes. In the absence
of local codes, in the United States, the unit must be installed in accordance with the
National Fuel Gas Code NFPA54/ANSI Z223.1 (latest edition). A Canadian installation
must be in accordance with the CSA B149.1 Natural Gas and Propane Installation
Code. These codes are available from CSA Information Services, 1-800-463-6727.
Local authorities having jurisdiction should be consulted before installation is made to
verify local codes and installation procedure requirements.
Clearances from the heater and vent to construction or material in storage must con-
form with the National Fuel Gas Code ANSI Z223.1 (latest edition) pertaining to gas-
burning devices, and such material must not attain a temperature over 160°F by con-
tinued operation of the heater.
Special Installations (Aircraft Hangars/Garages)
In the United States, installation in an aircraft hangar should be in accordance with
NFPA No. 409 (latest edition), Standard for Aircraft Hangars; in public garages in
accordance with NFPA No. 88A (latest edition), Standard for Parking Structures; and in
repair garages in accordance with NFPA No. 88B (latest edition), Standard for Repair
Garages. In Canada, installations in aircraft hangars, parking garages, and repair
garages should be in accordance with the requirements of the enforcing authorities
and with CSA B149.1 codes.
2.0 Furnace
Location
2.1 General Recommendations
A duct is designed for connection to an inlet and an outlet duct and depends on an
external air handler. Location must comply with the clearances listed in Paragraph 4.2.
There are a variety of factors, such as system application, building structure, dimen-
sions, and weight, that contribute to selecting the lotion. Read the installation informa-
tion in this manual and select a location that complies with the requirements.
CAUTION: Do not locate heater where it may be exposed to liquid
spray, rain or dripping water.
2.2 Combustion Air
Requirements
A Model EEDU duct furnace is designed to take combustion air from the space in which
the furnace is installed. The air that enters into the combustion process is vented to the
outdoors. Sufficient air must enter the equipment location to replace the air exhausted
through the vent system. Modern construction methods involve the greater use of insu-
lation, improved vapor barriers and weather-stripping, with the result that buildings
generally are much tighter structurally than they have been in the past. The combus-
tion air supply for gas-fired equipment can be affected by these construction conditions
because infiltration that would have existed in the past may not be adequate. Exten-
sive use of exhaust fans aggravates the situation. In the past the filtration of outside
air assumed in heat loss calculations (one air change per hour) was assumed to be
sufficient. However, current construction methods may now require the introduction of
outside air into the room or building through wall openings or ducts.
WARNING
A Model EEDU duct furnace is designed to take combustion air from the space in which it is installed
and is not designed for connection to an outside combustion air intake duct. Connecting this
furnace to an outside combustion air intake duct voids the warranty and could cause hazardous
operation. See Hazard Levels, page 2.
Requirements for combustion air and ventilation air depend upon whether the unit
is located in a confined or unconfined space. An "unconfined space" is defined as a
space whose volume is not less than 50 cubic feet per 1000 BTUH of the installed
appliance. Under all conditions, enough air must be provided to ensure there will not
be a negative pressure condition within the equipment room or space. A positive seal
must be made in all return-air connections and ducts. Even a slight leak can create a
negative pressure condition in a confined space and affect combustion.