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Carrier 58MEC Service And Maintenance Instructions

Deluxe 4-way multipoise 2-stage condensing gas furnace sizes 060 to 120
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58MEC
DELUXE 4---WAY MULTIPOISE 2---STAGE
CONDENSING GAS FURNACE
SIZES 060 TO 120
Service and Maintenance Instructions
NOTE: Read the entire instruction manual before starting the
installation.

TABLE OF CONTENTS

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WARNING
!
ELECTRICAL
SHOCK, FIRE, OR EXPLOSION
HAZARD
Failure to follow safety warnings exactly could result in
dangerous operation, personal injury, death, or property
damage.
- - Before servicing, disconnect all electrical power to furnace
and install lock out tag.
- -When servicing controls, label all wires prior to
disconnecting. Reconnect wires correctly.
- - Verify proper operation after servicing.
PAGE
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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
CAUTION. These words are used with the safety- -alert symbol.
DANGER identifies the most serious hazards which will result in
1
severe personal injury or death. WARNING signifies a hazard
2
which could result in personal injury or death. CAUTION is used
to identify unsafe practices which may result in minor personal
2
injury or product and property damage. NOTE is used to highlight
3
suggestions which will result in enhanced installation, reliability, or
3
operation.
3
Installing and servicing heating equipment can be hazardous due to
gas and electrical components. Only trained and qualified service
5
agency personnel should install, repair, or service heating
7
equipment.
7
!
7
8
ELECTRICAL SHOCK, FIRE, OR EXPLOSION
10
HAZARD
11
Failure to follow this warning could result in personal
injury, death or property damage.
11
The ability to properly perform maintenance on this
11
equipment requires certain expertise, mechanical skills,
13
tools, and equipment. If you do not possess these, do not
attempt to perform any maintenance on this equipment
13
other than those procedures recommended in the User's
13
Manual.
14
17
!
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in property
damage, 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
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.
1
WARNING
WARNING
.

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Summary of Contents for Carrier 58MEC

  • Page 1: Table Of Contents

    - - Verify proper operation after servicing. 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 PAGE CAUTION.

  • Page 2: General

    Wiring errors can cause improper and dangerous operation. GENERAL This furnace can be installed as a direct vent (2- -pipe) or non- -direct vent (1- -pipe) condensing gas furnace. These instructions are written as if the furnace is installed in an upflow application. An...

  • Page 3: Care And Maintenance

    2. Remove main furnace door and blower access panel. 3. Release filter retainer wire. (See Fig. 3 or 4.) NOTE: Filters shown in Fig. 3 and 4 can be in furnace blower compartment or in filter cabinet, but not in both.
  • Page 4 DISPOSABLE MEDIA FILTER IN FILTER CABINET Fig. 3 - - Bottom Filter Arrangement 3. Disconnect blower motor wires from furnace control. Field thermostat connections may need to be disconnected de- pending on their length and routing. 4. Remove control box mounting screws and position control box, transformer, and door switch assembly to right side of furnace casing.

  • Page 5: Cleaning Burners

    Fig. 5 - - Factory- -Shipped Upflow Tube Configuration (Shown with Blower Access Panel Removed) CAUTION UNIT DAMAGE HAZARD Failure to follow this caution may result in noise or furnace component failure. The blower wheel should not be dropped or bent as balance will be affected.
  • Page 6 CAUTION UNIT DAMAGE HAZARD Failure to follow this caution may result in damage to furnace. Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. 5. Remove wires from gas valve. Note location for reassembly.

  • Page 7: Cleaning Heat Exchangers

    1. Turn off gas and electrical supplies to furnace. 2. Remove main furnace door. CAUTION UNIT DAMAGE HAZARD Failure to follow this caution may result in furnace component damage. Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and hazardous operation.

  • Page 8: Flushing Collector Box And Drainage System

    6702, or Dow- -Corning RTV 738 sealant to groove in collector box. (See Fig. 12.) 11. Refer to furnace wiring diagram and reconnect wires to in- ducer motor and pressure switches or connectors. 12. Reconnect pressure tubes to pressure switches. See diagram on main furnace door for proper location of tubes.
  • Page 9 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; Factory Installed in Blower Shelf (Blower access panel removed) COLLECTOR BOX TUBE...

  • Page 10: Servicing Hot Surface Igniter

    Step 6 — Servicing Hot Surface Igniter The igniter does NOT require annual inspection. Check igniter resistance before removal. 1. Turn off gas and electrical supplies to furnace. 2. Remove main furnace door. 3. Disconnect igniter wire connection. Check igniter resistance. Igniter resistance is affect by tem- perature.

  • Page 11: Electrical Controls And Wiring

    Freezing condensate left in the furnace may damage the furnace. If the furnace will be off for an extended period of time in a structure where the temperature will drop to 32°F (0_C)or below, winterize as follows: 1. Turn off electrical supply to furnace.

  • Page 12: Field Wiring

    1-STAGE THERMOSTAT TERMINALS FIVE WIRE TWO-WIRE HEATING- ONLY W/W1 Y/Y2 115-V FUSED JUNCTION DISCONNECT SWITCH CONTROL (WHEN REQUIRED) 24-V TERMINAL BLOCK FURNACE 2-STAGE THERMOSTAT TERMINALS SEVEN WIRE THREE-WIRE HEATING- ONLY W/W1 Y/Y2 115-V FUSED JUNCTION DISCONNECT SWITCH CONTROL (WHEN REQUIRED) 24-V TERMINAL...

  • Page 13: Wiring Diagram

    Step 1 — Status Codes For an explanation of status codes, refer to service label located on back of main furnace door or Fig. 21. The stored status codes will NOT be erased from the control memory, if 115-or 24-v power is interrupted.

  • Page 14: Component Tests

    Blower motor operates on COOL speed for 10 sec. g. Inducer motor goes to low- -speed for 10 sec, then stops. 5. Reconnect R lead to furnace control, remove tape from blower door switch, and re-install blower door. 6. Operate furnace per instruction on outer door.

  • Page 15: Component Test

    - Inadequate flame carryover or rough ignition - Flame sensor must not be grounded - Green/Yellow wire MUST be connected to furnace sheet metal 43 LOW-HEAT PRESSURE SWITCH OPEN WHILE HIGH-HEAT PRESSURE SWITCH IS CLOSED - Check for: - Disconnected or obstructed pressure tubing...
  • Page 16 A08343 Fig. 22 - - Wiring Diagram...

  • Page 17: Troubleshooting Guide

    A05095...
  • Page 18 Copyright 2009 Carrier Corp. S 7310 W. Morris St. S Indianapolis, IN 46231 Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. Printed in U.S.A. Edition Date: 09/09 A05095 Catalog No: 58MEC ---01SM...

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