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NOTE: Read the entire instruction manual before performing any
service or maintenance.
This symbol → indicates a change since the last issue.
These procedures are for size 60,000 through 120,000 Btuh units.
Index Page
SAFETY CONSIDERATIONS.....................................................1
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS
PROCEDURE...........................................................................2
CARE AND MAINTENANCE..................................................2-5
Air Filter Arrangement..........................................................2-3
Blower Motor and Wheel.........................................................3
Cleaning Heat Exchanger......................................................3-5
Electrical Controls and Wiring.................................................5
Troubleshooting ........................................................................5
Application Wiring Diagrams ..................................................6
Unit Wiring Diagram................................................................7
Service Label ............................................................................8
Troubleshooting Guide .............................................................9
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, tags, and
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 NFPA No. 54-
1996/ANSI Z223.1-1996. In Canada, refer to the current edition of
the National Standard of Canada CAN/CGA-B149.1- and .2-M95
Natural Gas and Propane Gas Installation Codes. 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, and CAU-
TION. These words are used with the safety-alert symbol. DAN-
GER 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.
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 items, do not attempt to perform any
maintenance on this equipment other than those proce-
dures recommended in the User’s Manual. A FAILURE
TO FOLLOW THIS WARNING COULD RESULT IN
POSSIBLE DAMAGE TO THIS EQUIPMENT, SERI-
OUS PERSONAL INJURY, OR DEATH.
Fig. 2—Model 333BAV or
333JAV Upflow
A94085
Fig. 1—Model 333BAV or 333JAV Horizontal
A95137
®
ama
CANADIAN GAS ASSOCIATION
APPROVED
R
CERTIFICATION OF
MANUFACTURING SITE
service and
maintenance procedures
UPFLOW/HORIZONTAL,
VARIABLE-SPEED, 2-STAGE,
INDUCED-COMBUSTION FURNACES
Cancels: SP04-43 SP04-50
10-97
333BAV
333JAV
Series B
—1—
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