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Carrier 58MXA Service And Maintenance Instructions

4-way multipoise fixed-capacity direct-vent condensing gas furnace sizes 040-140, series 170
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Service and Maintenance Instructions
NOTE: Read the entire instruction manual before starting the
installation.
This symbol → indicates a change since the last issue.
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.
ELECTRICAL SHOCK, FIRE OR EXPLOSION
HAZARD
Failure to follow this warning could result in possible damage
to this equipment, serious personal injury, or death.
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.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
PC 101
Catalog No. 535-80142
Tab 6a 8a
Direct-Vent Condensing Gas Furnace
For Sizes 040-140, Series 170
A93040
Printed in U.S.A.
4-Way Multipoise Fixed-Capacity
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could cause corrosion of heat
exchanger, fire, 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.
SAFETY CONSIDERATIONS .....................................................1
GENERAL......................................................................................2
CARE AND MAINTENANCE.....................................................3
Cleaning and/or Replacing Air Filter.......................................3
Blower Motor and Wheel Maintenance...................................4
Cleaning Burners ......................................................................5
Cleaning Heat Exchangers........................................................5
Primary Heat Exchangers ......................................................5
Secondary Heat Exchangers ..................................................6
Servicing Hot Surface Igniter...................................................8
Electrical Controls and Wiring.................................................8
Winterizing................................................................................9
WIRING DIAGRAM.....................................................................9
TROUBLESHOOTING .................................................................9
Status Codes..............................................................................9
Component Tests ....................................................................11
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, 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 hazards
which could result in personal injury or death. CAUTION is used
to identify unsafe practices which may 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.
Form 58MXA-10SM
Pg 1
58MXA
.
9-04
Replaces: 58MXA-9SM

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  • Page 1: Table Of Contents

    Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Book 1 4 PC 101 Catalog No. 535-80142 Printed in U.S.A. Form 58MXA-10SM Pg 1 9-04 Replaces: 58MXA-9SM Tab 6a 8a...

  • Page 2: General

    → ELECTRICAL SHOCK AND UNIT DAMAGE HAZARD Failure to follow this caution may result in minor personal injury or damage to furnace. Label all wires prior to disconnection when servicing con- trols. Wiring errors can cause improper and dangerous operation. GENERAL These instructions are written as if the furnace is installed in an upflow application.

  • Page 3: Care And Maintenance

    WASHABLE FILTER IN FURNACE FILTER RETAINER WASHABLE FILTER FILTER SUPPORT FILTER RETAINER WASHABLE FILTER OR DISPOSABLE MEDIA WASHABLE FILTER OR FILTER IN FILTER CABINET DISPOSABLE MEDIA FILTER IN FILTER CABINET A00233 Fig. 4—Filter Installed for Side Inlet A00232 Fig. 3—Bottom Filter Arrangement 4.

  • Page 4: Blower Motor And Wheel Maintenance

    If filter is installed in furnace blower compartment: e. Remove bolts holding motor mounts to blower housing and slide motor and mounts out of housing. Disconnect capcitor 1. Turn off electrical supply to furnace. and ground wire attached to blower housing before remov- 2.

  • Page 5: Cleaning Burners

    CELL PANEL ELECTRICAL SHOCK HAZARD MANIFOLD Failure to follow this warning could result in personal injury MOUNTING SCREW or death. Blower access door switch opens 115-v power to furnace control. No component operation can occur. Caution must be taken when manually closing this switch for service purposes. 14.

  • Page 6: Secondary Heat Exchangers

    NOTE: Inspect combustion-air intake housing. If foamed gasket was removed, check for any damage. If gasket is damaged in any → ELECTRICAL SHOCK AND UNIT DAMAGE way, it must be repaired. To repair, remove damaged gasket HAZARD section, apply sealant releasing agent such as PAM cooking spray Failure to follow this caution may result in minor personal or equivalent (must not contain corn or canola oil, aromatic or injury or furnace component damage.

  • Page 7: Furnace Pressure And Drain Tubing Diagram

    TUBE ROUTING Furnace is shipped from factory in upflow configuration. Pressure tube and drain tube routing MUST match the diagrams below. Tube location when used in UPFLOW application Condensate Trap on LEFT Condensate Trap; Factory Installed Side Optional in Blower Shelf BURNER ENCLOSURE (Blower access panel removed) BURNER ENCLOSURE...

  • Page 8: Servicing Hot Surface Igniter

    inducer housing. (See Fig. 10.) Apply a small bead of G.E. RTV 162, G.E. RTV 6702, or Dow-Corning RTV 738 sealant to groove → UNIT DAMAGE HAZARD in collector box. Failure to follow this caution may result in premature failure 11.

  • Page 9: Checking Heat Tape Operation (If Applicable)

    Step 9—Winterizing → UNIT DAMAGE HAZARD Failure to follow this caution may result in furnace compo- nent damage. Freezing condensate left in the furnace will damage the equipment. If the furnace will be off for an extended period of time in a structure where the temperature will drop to 32°F or below, winterize as follows: 1.
  • Page 10 FIELD 24-V WIRING FIELD 115-, 208/230-, 460-V WIRING FACTORY 24-V WIRING FACTORY 115-V WIRING NOTE 2 THERMOSTAT FIVE WIRE FIELD-SUPPLIED TERMINALS DISCONNECT THREE-WIRE HEATING-ONLY 208/230- OR BLOWER DOOR SWITCH 460-V THREE PHASE 208/230-V SINGLE PHASE AUXILIARY 115-V FIELD- J-BOX SUPPLIED NOTE 1 DISCONNECT CONDENSING...

  • Page 11: Component Tests

    32°F MINIMUM INSTALLED AMBIENT OR FREEZE PROTECTION REQUIRED A93058 Fig. 13—Winterizing the Furnace A99119 Fig. 15—Funnel in Drain and Antifreeze Running Through Trap COMPONENT TEST UNIT MAY NOT OPERATE Failure to follow this warning could result in electrical shock, personal injury, or death. Blower access panel door switch opens 115-v power to control board.
  • Page 12 TO 115VAC FIELD DISCONNECT SCHEMATIC DIAGRAM (WHEN USED) BLOWER OFF DELAY LGPS NOTE #2 (NATURAL GAS & PROPANE) JUMPER SELECT EQUIPMENT GROUND DHUM CAP-1 MED LO NOTE #11 HEAT MED HI START SPARE-1 NOTE #10 HI/LO BLWR COOL EAC-2 Y/Y2 TEST/TWIN BLWM EAC-1...

  • Page 13: Component Test

    SERVICE If status code recall is needed, briefly remove then reconnect one main limit wire to display stored status code. On RED LED boards do not remove power or blower door before initiat- ing status code recall. After one status code recall is completed component test will occur. LED CODE STATUS CONTINUOUS OFF - Check for 115VAC at L1 &...
  • Page 16 Copyright 2004 CARRIER Corp. • 7310 W. Morris St. • Indianapolis, IN 46231 58mxa10sm 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.

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