Bryant 349HAZ Service And Maintenance Procedures Manual
service and
349HAZ
maintenance procedures
GAS-FIRED, INDUCED-COMBUSTION
HORIZONTAL FURNACES
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 personnel
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 symbol
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 CAUTION.
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 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.
Series B
Cancels: SP04-10 SP04-15
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
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.
Failure to follow this warning can cause corrosion of the heat
exchanger, fire, personal injury, or death.
WARNING: The ability to properly perform maintenance
on this equipment 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 equipment
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.
8-15-92
Fig. 1—Model 349HAZ Horizontal Furnace
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A91314
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 Section 1.)
2. Check blower motor and wheel for cleanliness and lubrication
each heating and cooling season. Clean and lubricate as
necessary. (See Section 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.
CAUTION: As with any mechanical equipment, personal
injury could result from sharp metal edges, etc. Be careful
when removing parts, panels, or components.
I. 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 (1) 13x23x1 Cleanable
75,000 (1) 13x23x1 Cleanable
100,000 (1) 16x23x1 Cleanable
125,000 (1) 20x23x1 Cleanable
FILTER SIZE
(IN.)
FILTER TYPE
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 torn, 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.
II. 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 failures.
c. Allow time for total quantity of oil to be absorbed by each
bearing.
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