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PRODUCT DESIGN
General Operation
The AMS8 furnaces are equipped with an electronic igni-
tion device used to light the burners and an induced draft
blower to exhaust combustion products.
An interlock switch prevents furnace operation if the inner
blower door is not in place. Keep the blower access door in
place except for inspection and maintenance. (See illus-
tration on pages 5 and 6.)
This furnace is also equipped with a self-diagnosing elec-
tronic control module. In the event a furnace component is
not operating properly, the control module LED will flash
on and off in a factory-programmed sequence, depending
on the problem encountered. This light can be viewed through
the observation window in the blower access door. Refer to
the Troubleshooting Chart for further explanation of the
LED codes and Abnormal Operation - Integrated Ignition
Control section in the Service Instructions for an explana-
tion of the possible problem.
The rated heating capacity of the furnace should be greater
than or equal to the total heat loss of the area to be heated.
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.
*Obtain from: American National Standards Institute 1430
Broadway New York, NY 10018
Location Considerations
•
The furnace should be as centralized as is practical
with respect to the air distribution system.
•
Do not install the furnace directly on carpeting, tile,
or combustible material other than wood flooring.
•
When installed in a residential garage, the furnace
must be positioned so the burners and ignition source
are located not less than 18 inches (457 mm) above
the floor and protected from physical damage by ve-
hicles.
Notes:
T
O PREVENT POSSIBLE PERSONAL INJURY OR DEATH DUE TO ASPHYXIATION,
C
THIS FURNACE MUST BE
ATEGORY
C
III
ATEGORY
VENTING.
Category I Venting is venting at a non-positive pressure. A
furnace vented as Category I is considered a fan-assisted
appliance and the vent system does not have to be "gas
tight." NOTE: Single stage gas furnaces with induced
draft blowers draw products of combustion through a heat
exchanger allowing, in some instances, common venting
with natural draft appliances (i.e. water heaters). All instal-
lations must be vented in accordance with National Fuel
4
WARNING
I
D
VENTED.
O NOT VENT USING
Gas Code NFPA 54/ANSI Z223.1 - latest edition. In Canada,
the furnaces must be vented in accordance with the Na-
tional Standard of Canada, CAN/CSA B149.1 and CAN/
CSA B149.2 - latest editions and amendments.
NOTE: The vertical height of the Category I venting system
must be at least as great as the horizontal length of the
venting system.
Accessibility Clearances (Minimum)
Unobstructed front clearanace of 24" for servicing is rec-
ommended.
MINIMUM CLEARANCE TO COMBUSTIBLE MATERIALS - INCHES
Sides
Rear
Front*
1
0
3
* 24" clearnace for serviceability recommended.
** Single Wall Vent (SW) to be used only as a conncetor.
Refer to the venting tables outlined in the Installation Manual for
additional venting requirements.
Note: In all cases accessibility clearance shall take prece-
dence over clearances from the enclosure where accessi-
bility clearances are greater. All dimensions are given in
inches.
High Altitude Derate
IMPORTANT NOTE: The furnace as shipped requires no
change to run between 0 - 5500 feet. Do not attempt to
increase the firing rate by changing orifices or increasing
the manifold pressure below 5500 feet. This can cause poor
combustion and equipment failure.
High altitude installations above 5500 feet may require both
a pressure switch and an orifice change. These changes
are necessary to compensate for the natural reduction in
the density of both the gas fuel and the combustion air at
higher altitude.
For installations above 5500 feet, please refer to your dis-
tributor for required kit(s). Contact the distributor for a tabu-
lar listing of appropriate manufacturer's kits for propane
gas and/or high altitude installations. The indicated kits must
be used to insure safe and proper furnace operation. All
conversions must be performed by a qualified installer, or
service agency.
Vent
Top
SW
B
6
1
1
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