Introduction - International comfort products N8MSN Installation Instructions Manual

which has an external static pressure within the allow-
able range, as specified in the "Start−Up, Adjustments,
and Safety Check" section. See furnace rating plate.
7. When a furnace is installed so that supply ducts carry
air circulated by the furnace to areas outside the space
containing the furnace, the return air shall also be
handled by duct(s) sealed to the furnace casing and
terminating outside the space containing the furnace.
See "Air Ducts" section.
8. A gas−fired furnace for installation in a residential gar-
age must be installed as specified in the warning box in
the "Location" section.
9. The furnace may be used for construction heat
provided that the furnace installation and operation
complies with the first CAUTION in the LOCATION sec-
tion of these instructions.
10. These Multipoise Gas−Fired Furnaces are CSA
(formerly A.G.A. and C.G.A.) design−certified for use
with natural and propane gases (see furnace rating
plate) and for installation in alcoves, attics, basements,
closets, utility rooms, crawlspaces, and garages. The
furnace is factory−shipped for use with natural gas. A
CSA (A.G.A. and C.G.A.) listed accessory gas conver-
sion kit is required to convert furnace for use with pro-
pane gas.
11. See Figure 1 for required clearances to combustible
construction.
12. Maintain a 1−in. (25 mm) clearance from combustible
materials to supply air ductwork for a distance of 36 in.
4
N8MSN & N8MSL 4−way multipoise Category I fan−assisted
furnace is CSA design−certified. A Category I fan−assisted
furnace is an appliance equipped with an integral mechanical
means to either draw or force products of combustion through
the combustion chamber and/or heat exchanger. The furnace
is factory−shipped for use with natural gas. This furnace is
not approved for installation in mobile homes, recreational
vehicles, or outdoors.
This furnace is designed for minimum continuous return−air
temperature of 60_F (16_C) db or intermittent operation down
to 55_F (13_C) db such as when used with a night setback
thermostat. Return−air temperature must not exceed 80_F
(27_C) db. Failure to follow these return−air temperature limits
may affect reliability of heat exchangers, motors, and
controls. (See Figure 3)
Figure 2 - Clearances to Combustibles
(914 mm) horizontally from the furnace. See NFPA 90B
or local code for further requirements.
13. These furnaces SHALL NOT be installed directly on
carpeting, tile, or any other combustible material other
than wood flooring. In downflow installations, factory
accessory floor base MUST be used when installed on
combustible materials and wood flooring. Special base
is not required when this furnace is installed on manu-
facturer's coil model numbers END4X, ENW4X or
when coil casing model number NAEA is used. See
Figure 1 for clearance to combustible construction in-
formation.

INTRODUCTION

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