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Furnace

Water
Heater

Opening

Chimney or Gas Vent

NOTE: The single opening must have
a free area of not less than one
square inch per 3000 BTU of
the total input rating of all equip-
ment in the enclosure, but not less than
the sum of the areas of all vent
connectors in the confined space.

Alternate
Opening
Location

Equipment Located in Confined Spaces; All Air from Outdoors -

Single Air Opening. See 5.3.3-b.

5. When directly communicating with the outdoors, the single open-

ing shall have a minimum free area of 1 square inch per 3,000
BTU per hour of total input rating of all equipment in the enclo-
sure.

5.3.4 Specially Engineered Installations:

The requirements of 5.3.3 shall not necessarily govern when special
engineering, approved by the authority having jurisdiction, provides an
adequate supply of air for combustion, ventilation, and dilution of flue
gases.

5.3.5 Louvers and Grilles:

In calculating free area in 5.3.3, consideration shall be given to the block-
ing effect of louvers, grilles or screens protecting openings. Screens used
shall not be smaller than 1/4 inch mesh. If the area through a design of
louver or grille is known, it should be used in calculating the size of
opening required to provide the free area specified. If the design and free
area is not known, it may be assumed that wood louvers will have 20-25
percent free area and metal louvers and grilles will have 60-75 percent
free area. Louvers and grilles shall be fixed in the open position or
interlocked with the equipment so that they are opened automatically
during equipment operation.

5.3.6 Special Conditions Created by Mechanical Exhausting or Fire-

places:

Operation of exhaust fans, ventilation systems, clothes dryers, or fire-
places may create conditions requiring special attention to avoid unsat-
isfactory operation of installed gas utilization equipment. Air from
Inside Building. See 5.3.3-a.

VI. INST

VI. INSTALL

ALL

ALLA

ATI

TIO

ON POSITI

N POSITI

N POSITIO

ONS

This furnace may be installed in an upright position or horizontal
on either the left or right side panel. Do not install this furnace on
its back. For

upright upflow

furnaces, return air ductwork may be

attached to the side panel(s) and/or basepan. For

horizontal up-

flow

furnaces, return air ductwork must be attached to the basepan.

For both

upright or horizontal counterflow

furnaces, return duct-

work must be attached to the basepan (top end of the blower com-
partment).

NOTE:

Ductwork must never be attached to the back of

the furnace. Contact your distributor for proper airflow require-
ments and number of required ductwork connections. Refer to
“Recommended Installation Positions” figure for appropriate in-
stallation positions, ductwork connections, and resulting airflow
arrangements.

VII. HO

VII. HORIZO

RIZO

RIZONT

NTAL APPLI

AL APPLI

AL APPLIC

ATI

TIO

ONS & CO

NS & CO

NS & CONSID

NSID

NSIDERA

ERA

ERATI

TIO

ONS

ENERAL

Horizontal applications, in particular, may dictate many of the
installation’s specifics such as airflow direction, ductwork connec-
tions, flue and combustion air pipe connections, etc. The basic
application of this furnace as a horizontal furnace differs only slightly
from an upright installation. When installing a furnace horizontally,
additional consideration must be given to the following:

ALTERNATE

VENT/FLUE

AND

COMBUSTION

AIR

INTAKE

FURNACE MUST BE LEVEL

FROM END TO END

FURNACE MUST BE LEVEL

OR SLIGHTLY TILTED FORWARD

WITH THE DOORS 0" - 3/4"

BELOW THE BACK PANEL

DRAIN LINE WITH

1/4" PER FOOT

DOWNWARD SLOPE

36" MINIMUM SERVICE

CLEARANCE REQUIRED

FURNACE MUST BE SUPPORTED

AT BOTH ENDS AND MIDDLE

DRAIN

PAN

GAS LINE WITH

DRIP LEG

(3" MINIMUM)

4 3/4" MINIMUM

DRAIN TRAP

CLEARANCE

Horizontal Furnace

RAIN

RAP

AND

INES

In horizontal applications the condensate drain trap is secured to
the furnace side panel, suspending it below the furnace. A mini-
mum clearance of 4 3/4 inches below the furnace must be pro-
vided for the drain trap. Additionally, the appropriate downward
piping slope must be maintained from the drain trap to the drain
location. Refer to

Section X, Condensate Drain Trap and Lines

for

further details. If the drain trap and drain line will be exposed to
temperatures near or below freezing, adequate measures must
be taken to prevent condensate from freezing.

EVELING

Leveling ensures proper condensate drainage from the heat ex-
changer and induced draft blower. For proper flue pipe drainage,
the furnace must be level lengthwise from end to end. The furnace
should also be level from back to front or have a slight tilt with the
access doors downhill (approximately 3/4 inches) from the back
panel. The slight tilt allows the heat exchanger condensate, gen-
erated in the recuperator coil, to flow forward to the recuperator coil
front cover.

LTERNATE

ENT

LUE

AND

OMBUSTION

ONNECTIONS

In horizontal installations provisions for alternate flue and com-
bustion air piping are available for upflow furnaces with left dis-
charge and counterflow furnaces with right air discharge. This
configuration allows the flue and combustion air piping to be run
vertically through the furnace. Refer to the “Recommended Instal-
lation Positions” figure for further detail. The standard piping con-
nections may also be used in these positions. Refer to

Section IX,

Vent/Flue Pipe

and Combustion Air Pipe for details concerning the

conversion to the alternate vent/flue and combustion air connec-
tions.