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58MVP
Deluxe 4-Way Multipoise Variable-Capacity
Direct-Vent Condensing Gas Furnace
Service and Maintenance Instructions
For Sizes 040–120, Series 140 and 150
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
Introduction ....................................................................................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
Flushing Collector Box and Drainage
System ............................................................................................7
Servicing Hot Surface Ignitor ..................................................7
Electrical Controls and Wiring.................................................8
Checking Heat Tape Operation
(If Applicable)................................................................................8
Winterizing................................................................................9
WIRING DIAGRAMS.................................................................10
TROUBLESHOOTING ...............................................................10
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-B/49.1- and
.2-M95 National Standard of Canada, Natural Gas and Propane
A93040
Fig. 1—Multipoise Furnace in Upflow Orientation
A92496
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ULTRA HIGH EFFICIENCY
GAS FURNANCE
REGISTERED QUALITY SYSTEM
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EFFICIENCY
RATING
CERTIFIED
CERTIFIED
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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. 535-795 Printed in U.S.A. Form 58MVP–9SM Pg 1 10-00 Replaces: 58MVP-7SM