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WARNING: ELECTRICAL SHOCK, FIRE,
OR EXPLOSION HAZARD
Failure to follow safety warnings exactly could result in
dangerous operation, serious injury, death, or property
damage.
Improper servicing could result in dangerous operation,
serious indury, death, or property damage.
Before servicing, disconnect all electrical power to fur-
nace.
When servicing controls, label all wires prior to discon-
necting. Reconnect wires correctly.
Verify proper operation after servicing.
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.
WARNING: Never store anything on, near, or in contact
with the furnace, such as:
1. Spray or aerosol cans, rags, brooms, dust mops,
vacuum cleaners, or other cleaning tools.
2. Soap powders, bleaches, waxes or other cleaning
compounds, plastic or plastic containers, gasoline,
kerosene, cigarette lighter fluid, dry cleaning fluids, or
other volatile fluids.
3. Paint thinners and other painting compounds, paper
bags, or other paper products.
Failure to follow this warning can cause corrosion of
the heat exchanger, fire, personal injury, or death.
NOTE: Read the entire instruction manual before starting the
installation.
This symbol → indicates a change since the last issue.
TABLE OF CONTENTS
SAFETY CONSIDERATIONS.....................................................1
GENERAL......................................................................................2
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS........2
CARE AND MAINTENANCE.....................................................2
Cleaning and/or Replacing Air Filter.......................................3
Blower Motor and Wheel Maintenance...................................3
Cleaning Burners ......................................................................4
Cleaning Heat Exchangers........................................................5
Primary Heat Exchangers....................................................5
Secondary Heat Exchangers................................................6
Flushing Collector Box and Drainage
System.......................................................................................6
Servicing Hot Surface Ignitor ..................................................7
Electrical Controls and Wiring.................................................8
Checking Heat Tape Operation
(If Applicable)...........................................................................8
Winterizing................................................................................8
WIRING DIAGRAM.....................................................................9
TROUBLESHOOTING .................................................................9
Status Codes..............................................................................9
Component Test........................................................................9
SAFETY CONSIDERATIONS
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 hazards 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.
Installing and servicing heating equipment can be hazardous due to
gas and electrical components. Only trained and qualified service
agency personnel should install, repair, or service heating equip-
ment.
Untrained personnel can perform basic maintenance functions
such as cleaning and replacing air filters. All other operations must
be performed by trained and qualified service agency 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 including the National Fuel Gas Code
(NFGC) NFPA 54-1999/ANSI Z223.1-1999 in the USA; National
Standard of Canada, Natural Gas and Propane Installation Code
A93040
service and
maintenance procedures
4-WAY MULTIPOISE
FIXED-CAPACITY DIRECT-VENT
CONDENSING GAS FURNACE
Cancels: SP05-47 SP05-52
8-02
350MAV
Series G
—1—