Bryant GAS-FIRED INDUCED-COMBUSTION FURNACE 393AAV - Manual

NOTE: Read the entire instruction manual before performing any
service or maintenance.
These procedures are for size 66,000 through 154,000 Btuh input
units.
Index Page
SAFETY CONSIDERATIONS .....................................................1
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS
PROCEDURE ...........................................................................2
CARE AND MAINTENANCE..................................................2-8
Air Filter Arrangement .............................................................2
Blower Motor and Wheel......................................................2-3
Cleaning Heat Exchanger......................................................3-5
Unit Wiring Diagram................................................................7
Electrical Controls and Wiring .............................................5-8
Troubleshooting ...................................................................8-11
Service Label ............................................................................9
Troubleshooting Guide ......................................................10-11
SAFETY CONSIDERATIONS
Installing and servicing heating equipment can be hazardous due to
gas and electrical components. Only trained and qualified person-
nel should install, repair, or service heating equipment.
Untrained personnel can perform basic maintenance functions
such as cleaning and replacing air filters. All other operations must
be performed by trained service personnel. When working on
heating equipment, observe precautions in the literature, on tags,
and on labels attached to or shipped with the unit and other safety
precautions that may apply.
Follow all safety codes. In the United States, follow all safety
codes including the National Fuel Gas Code (NFGC) NFPA
54-1999/ANSI Z223.1-1999 and the Installation Standards, Warm
Air Heating and Air Conditioning Systems (NFPA 90B)
ANSI/NFPA 90B. In Canada, refer to the CAN/CGA-B149.1- and
.2-M95 National Standard of Canada, Natural Gas and Propane
Installation Codes (NSCNGPIC). Wear safety glasses and work
gloves. Have fire extinguisher available during start-up and
adjustment procedures and service calls.
Recognize safety information. This is the safety-alert symbol .
When you see this symbol on the furnace and in instructions or
manuals, be alert to the potential for personal injury.
Understand the signal words DANGER, WARNING, CAUTION,
and NOTE. These words are used with the safety-alert symbol.
DANGER identifies the most serious hazards which will result in
severe personal injury or death. WARNING signifies a hazard
which could result in personal injury or death. CAUTION is used
to identify unsafe practices which would result in minor personal
injury or product and property damage. NOTE is used to highlight
suggestions which will result in enhanced installation, reliability,
or operation.
WARNING: The ability to properly perform mainte-
nance on this equipment requires certain expertise, me-
chanical skills, tools, and equipment. If you do not
possess these, do not attempt to perform any maintenance
on this equipment other than those procedures recom-
mended in the User’s Manual. FAILURE TO FOLLOW
THIS WARNING COULD RESULT IN POSSIBLE
DAMAGE TO THIS EQUIPMENT, SERIOUS PER-
SONAL INJURY, OR DEATH.
CAUTION: Label all wires prior to disconnection when
servicing controls. Wiring errors can cause improper and
dangerous operation.
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CANADIAN GAS ASSOCIATION
A PP R O VED
R
REGISTERED QUALITY SYSTEM
Fig. 1—Model 393AAV Upflow Furnace
A94085
service and
maintenance procedures
GAS-FIRED
INDUCED-COMBUSTION FURNACE
Cancels: SP04-52 SP04-58
8-99
393AAV
Series A
—1—