58MXA
4-Way Multipoise Fixed-Capacity
Direct-Vent Condensing Gas Furnace
Service and Maintenance Instructions
For Sizes 040-140, Series 160
ELECTRICAL SHOCK, FIRE, OR EXPLOSION HAZARD
Failure to follow safety warnings exactly could result in
dangerous operation, serious injury, death, or property dam-
age.
Improper servicing could result in dangerous operation,
serious injury, death, or property damage.
- Before servicing, disconnect all electrical power to furnace.
- When servicing controls, label all wires prior to disconnect-
ing. Reconnect wires correctly.
- Verify proper operation after servicing.
The ability to properly perform maintenance on this equip-
ment requires certain expertise, mechanical skills, tools, and
equipment. If you do not possess these, do not attempt to
perform any maintenance on this equipment other than those
procedures recommended in the User’s Manual. FAILURE
TO FOLLOW THIS WARNING COULD RESULT IN
POSSIBLE DAMAGE TO THIS EQUIPMENT, SERIOUS
PERSONAL INJURY, OR DEATH.
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 com-
pounds, 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.
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indicates a change since the last issue.
TABLE OF CONTENTS
SAFETY CONSIDERATIONS .....................................................2
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 Igniter...................................................7
Electrical Controls and Wiring.................................................8
Checking Heat Tape Operation (If Applicable) ....................10
Winterizing..............................................................................10
WIRING DIAGRAM...................................................................11
TROUBLESHOOTING ...............................................................11
Status Codes............................................................................11
Component Tests ....................................................................11
A93040
Fig. 1—Multipoise Furnace in Upflow Orientation
A93007
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U L T R A H
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I C I E N C Y
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®
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Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1
4
Tab
6a 8a
PC 101
Catalog No. 535-80099
Printed in U.S.A.
Form 58MXA-9SM
Pg 1
11-02
Replaces: 58MXA-8SM
