Carrier 58EFA User Manual
HEATING & COOLING
58EFA
Gas-Fired Horizontal
Induced-Combustion Furnaces
Service and Maintenance instructions
For Sizes 050-125, Series 110
NOTE: Read the entire instruction manual before starting the
installation.
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, tags, and
labels attached to or shipped with the unit and other safety
precautions that may apply.
Follow all safety codes, including NFPA 54/ANSI Z223.1-1988,
National Fuel Gas Code. Wear safety glasses and work gloves.
Have fire extinguisher available during start-up and adjustment
procedures and service call.
Recognize safety information. This is the safety-alert sy
When you see this symbol on the unit and in instructions or
manuals, be alert to the potential for personal injury.
Understand the signal word—DANGER, WARNING, or CAU
TION. These words are used with the safety-alert symbol. DANGfeR'idehtifies the most serious hazards which will result in severe
personal injury or death. WARNING signifies hazards that 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.
A 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 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.
A WARNING
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.
CARE AND MAINTENANCE
For continuing high performance and to minimize possible equip
ment failure, it is essential that maintenance be performed annually
on this equipment. Consult your local dealer for maintenance and
the availability of a maintenance contract.
Book 1 4
Tab 6a 8a
Fig. 1—Model 58EFA Horizontal Furnace
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obiigations.
PC 101
Catalog No. 565-839 Printed in U.S.A.
Form 58EFA-2SM
Pg1
8-92
Replaces: 58EFA-1SM
A91314
A WARNING
Turn OFF the gas and electrical supplies to the unit before
performing any maintenance or service. Follow the operating
instructions on the label attached to the furnace. Failure to
follow this warning could result in personal injury.
The minimum maintenance that should be performed on this
equipment is as follows:
1. Check and clean or replace air filter each month, or as
required. (See Step 1.)
2. Check blower motor and wheel for cleanliness and lubrication
each heating and cooling season. Clean and lubricate as
necessary. (See Step 2.)
3. Check electrical connections for tightness and controls for
proper operation each heating season. Service as necessary.
4. Check for blockages of vent pipe.
A CAUTION
As with any mechanical equipment, personal injury could
result from sharp metal edges, etc. Be careful when removing
parts, panels, or components.
Step 1—Air Filter Cleaning and Replacement
The air filter arrangement may vary depending on the application.
Each furnace may be supplied with a permanent, washable filter
and wire filter retainer option. If so, the filter is normally located
in the return-air plenum opening before the blower. (See Fig. 2.)
Fig. 2—Blower Compartment
A91175
Table 1—Horizontal Furnace Filters
FURNACE SIZE
(INPUT BTUH)
50,000
75,000 (1) 13x23x1 Cleanable
100,000 (1) 16x23x1 Cleanable
125,000 (1) 20x23x1
FILTER SIZE
(IN.)
(1) 13x23x1 Cleanable
FILTER TYPE
Cleanable
A CAUTION
Never operate unit without a filter or with filter access door
removed. Failure to follow this warning could result in a fire
or personal injury.
To clean or replace the filters, proceed as follows;
1. Turn OFF electrical supply to unit.
2. Remove blower access door located at inlet (return air) end of
furnace; 4 screws must be removed.
3. Bend wire filter retainer until it clears furnace flange and
swing it toward the blower.
4. Remove filter from furnace. If filter is tom, replace it.
5. Furnaces may be equipped with permanent, washable filters.
Clean these filters by spraying cold tap water through filter in
opposite direction of airflow. A mild liquid detergent may be
used if necessary.
6. Rinse filters and let dry. Oiling or coating of filters is not
recommended or required for factory-supplied filters.
7. Reinstall filters with cross-mesh binding facing blower.
8. Replace blower access door and reinstall 4 screws.
9. Turn ON electrical supply to furnace.
Step 2—Blower Motor and Wheel Maintenance
For long life, economy, and high efficiency; clean accumulated
dirt and grease from blower wheel and motor annually.
The following items should be performed by a qualified service
technician:
Some motors have prelubricated, sealed bearings and require no
lubrication. These motors can be identified by the absence of oil
ports on each end of the motor. For motors with oil ports, lubricate
as follows:
Lubricate motor every 5 years if motor is used for intermittent
operation (thermostat FAN switch in AUTO position), or every 2
years if motor is in continuous operation (thermostat FAN switch
in ON position).
Clean and lubricate as follows:
1. Turn OFF electrical supply to unit.
2. Remove blower access door; 4 screws must be removed.
3. Remove blower assembly as follows:
a. Remove 4 screws securing front blower support bracket
and remove bracket. (See Fig. 2.)
b. Using a 3/8-in. ratchet with a 3-in. extension, reach through
4-in. diameter holes in rear blower support bracket and
remove 2 screws securing bracket to blower shelf. (See Fig.
2.)
c. Disconnect motor leads from motor speed selector. (See
Fig. 2.)
d. Remove blower assembly from unit.
4. Mark blower wheel location on shaft before disassembly to
insure proper reassembly.
5. Loosen setscrew holding blower wheel on motor shaft.
6. Disconnect ground wire from blower housing.
7. Remove bolts holding motor mount to blower housing and
slide motor and mount out of housing.
8. Lubricate motor (when oil ports are provided).
a. Remove dust caps or plugs from oil ports located at each
end of motor. If motor does not have these caps or plugs,
bearings are sealed and need no further lubrication.
b. Use a good grade of SAE 20 nondetergent motor oil and
add 1 teaspoon (5 cc, 3/16 oz, or 16 to 25 drops) in each oil
port. The use of other types or grades of oil will damage the
motor. Excessive oiling can cause premature bearing fail
ures.
c. Allow time for total quantity of oU to be absorbed by each
bearing.
WA
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