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REQUIREMENTS
In the US, installation of Lennox gas central furnaces
must conform with local building codes or, in the abĆ
sence of local codes, with the current National Fuel Gas
Code (ANSI-Z223.1). The National Fuel Gas Code is
available from:
American National Standards Institute, Inc.
1430 Broadway
New York, NY 10018
All G20R units are A.G.A. (American Gas Association)
and C.G.A (Canadian Gas Association) certified.
NOTE-G20RXE series units (units equipped with flame
rods) are certified for use with natural gas only.
Air supply for combustion and ventilation must conĆ
form to the methods outlined in the current National
Fuel Gas Code.
WARNING
Product contains fiberglass wool.
Disturbing the insulation in this product during
installation, maintenance, or repair will expose you
to fiberglass wool. Breathing this may cause lung
cancer. (Fiberglass wool is known to the State of
California to cause cancer.)
Fiberglass wool may also cause respiratory, skin,
and eye irritation.
To reduce exposure to this substance or for further
information, consult material safety data sheets
available from address shown below, or contact
your supervisor.
Lennox Industries Inc.
P.O. Box 799900
Dallas, TX 75379-9900
The furnace is certified for installation clearances to
combustible material as listed on the appliance rating
plate and in table 1:
Clearances
Location
Inches (mm)
Service access
To combustible
materials
From draft hood relief
opening
Front
Top, side and rear
Flue
Front
36 in. (914mm)*
1 in. (25mm)
6 in. (152mm)**
6 in. (152mm)
NOTE-Service access clearance must be maintained.
TABLE 1
* If tight installation, front service clearance may be 24" (610mm).
** Clearance is 1" (25mm) for type B1 vent.
Accessibility and service clearances must take preceĆ
dence over fire protection clearances.
Vent installations shall be in accordance with the curĆ
rent GAMA/A.G.A. venting tables manual (502,567M),
or applicable provisions of local building codes. Vent
connectors serving appliances vented by natural draft
shall not be connected into any portion of mechanical
draft systems operating under positive pressure.
NOTE-For installation on combustible floors, appliance
shall not be installed directly on carpeting, tile, or other
combustible material other than wood flooring.
For installation in a residential garage, unit must be
installed so that burner(s) and ignition source are loĆ
cated no less than 18 in. (457 mm) above floor. Furnace
must be located or protected to avoid physical damage
by vehicles.
Unit must be adjusted to obtain a temperature rise
within the range specified on appliance rating plate.
The draft hood shall be installed in the same atmospheric
pressure zone as the combustion air inlet to the furnace.
G20R unit must be installed so that electrical compoĆ
nents are protected from water.
When furnace is used in conjunction with cooling
units, it shall be installed in parallel with, or on the upĆ
stream side of, cooling units to avoid condensation in
the heating element. With a parallel flow arrangement,
damper (or other means to control the flow of air) shall
be adequate to prevent chilled air from entering the
furnace and, if manually operated, must be equipped
with means to prevent operation of either unit, unless
damper is in the full heat" or cool" position.
When installed, furnace must be electrically grounded
in accordance with local codes or, in the absence of loĆ
cal codes, with the current National Electric Code,
ANSI/NFPA No. 70. The National Electric Code (ANSI/
NFPA No. 70) is available from:
National Fire Protection Association
470 Atlantic Avenue
Boston, MA 02210
Field wiring connection with unit must meet or exceed
specifications of type T wire and withstand a 63
F
(17
C) temperature rise. When furnace is installed so
that supply ducts carry air circulated by furnace to
areas outside space containing furnace, return air shall
be handled by a duct(s) sealed to the furnace casing
and terminating outside space containing furnace.
This furnace is certified for installation clearances to
combustible material as listed on appliance rating plate
and in table 1. Accessibility and service clearances must
take precedence over fire protection clearances.
n Canada, installation of C.G.A. certified units must conĆ
form with current Standard CAN/CGA-B149.1 Installation
Code for Natural Gas Burning Appliances and Equipment"
and CAN/CGA-B149.2 Installation Code for Propane Gas
Burning Appliances and Equipment," local plumbing or
waste water codes and other applicable local codes. AuĆ
thorities having jurisdiction should be consulted before
installation. Adequate clearance shall be made around air
