Bryant Heating and Cooling System 915S Gas Furnace Maintenance

WARNING: FIRE OR EXPLOSION HAZARD Failure to follow this warning could result in personal injury, death and/or property damage. Never store flammable or combustible materials 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. Exposure to these materials could lead to corrosion of the heat exchangers.

For continuing high performance and to minimize possible furnace failure, periodic maintenance must be performed on this furnace. Consult your local dealer about proper frequency of maintenance and the availability of a maintenance contract.

WARNING: ELECTRICAL SHOCK AND FIRE HAZARD Failure to follow this warning could result in personal injury, death, and/or property damage. Turn off the gas and electrical supplies to the furnace and install lockout tag before performing any maintenance or s

WARNING: CARBON MONOXIDE POISONING AND FIRE HAZARD Failure to follow this warning could result in personal injury, death and/or property damage. Never operate furnace without a filter or filtration device installed. Never operate a furnace with filter or

CAUTION: CUT HAZARD Failure to follow this caution may result in personal injury. Sheet metal parts may have sharp edges or burrs. Use care and wear appropriate protective clothing, safety glasses and gloves when handling parts, and servicing furnaces.

The minimum maintenance on this furnace is as follows:

Cleaning and/or Replacing Air Filter

WARNING: CARBON MONOXIDE POISONING AND FIRE HAZARD Failure to follow this warning could result in personal injury, death and/or property damage. Never operate furnace without a filter or filtration device installed. Never operate a furnace with filter or

NOTE: If the filter has an airflow direction arrow, the arrow must point toward the blower. To clean or replace filters, proceed as follows:

WARNING: ELECTRICAL SHOCK, FIRE OR EXPLOSION HAZARD Failure to follow this warning could result in personal injury or death, or property damage. Before installing, modifying, or servicing system, main electrical disconnect switch must be in the OFF positi

Blower Motor and Wheel Maintenance

To ensure long life, economy, and high efficiency, clean accumulated dirt and grease from blower wheel and motor annually. The inducer and blower motors are pre--lubricated and require no additional lubrication. These motors can be identified by the absen

The following items should be performed by a qualified service technician. Clean blower motor and wheel as follows:

Disconnect the vent and combustion air pipe by:

See Fig. 61 for steps 5 through 14.

NOTE: Blower wheel is fragile. Use care.

If greasy residue is present on blower wheel, remove wheel from the blower housing and wash it with an appropriate degreaser. To remove wheel:

NOTE: Mark blower mounting arms and blower housing so each arm is positioned at the same hole location during reassembly.

NOTE: Be sure to attach ground wire and reconnect blower harness plugs to blower motor

WARNING: ELECTRICAL OPERATION HAZARD Failure to follow this warning could result in personal injury or death. Blower door switch opens 115--v power to control. No component operation can occur unless switch is closed. Caution must be taken when manually c

Downflow or horizontal furnaces with vent pipe through furnace only:

NOTE: If R--W/W1 thermostat terminals are jumpered at the time blower door switch is closed, blower will run for 90 sec before beginning a heating cycle.

Cleaning Burners and Flame Sensor

The following items must be performed by a qualified service technician. If the burners develop an accumulation of light dirt or dust, they may be cleaned by using the following procedure:

NOTE: Use a back-up wrench on the gas valve to prevent the valve from rotating on the manifold or damaging the mounting to the burner assembly

WARNING: ELECTRICAL SHOCK AND FIRE HAZARD Failure to follow this warning could result in personal injury, death, and/or property damage. Turn off the gas and electrical supplies to the furnace and install lockout tag before performing any maintenance or s

To reinstall burner assembly:

NOTE: If manifold does not fit flush against the burner, do not force the manifold on the burner assembly. The burners are not fully seated forward in the burner assembly. Remove the manifold and check burner positioning in the burner assembly assembly be

NOTE: Use propane-resistant pipe dope to prevent leaks. Do not use Teflon tape.

WARNING: FIRE OR EXPLOSION HAZARD Failure to follow this warning could result in personal injury, death, and/or property damage. Never purge a gas line into a combustion chamber. Never test for gas leaks with an open flame. Use a commercially available so

Servicing Hot Surface Igniter

The igniter does NOT require annual inspection. Check igniter resistance before removal. Refer to Fig. 56, 57 and 62.

Check igniter resistance. Igniter resistance is affected by temperature. Only check resistance when the igniter is at room temperature.

Remove igniter assembly.

Flushing Collector Box and Drainage System

WARNING: ELECTRICAL SHOCK AND FIRE HAZARD Failure to follow this warning could result in personal injury, death, and/or property damage. Turn off the gas and electrical supplies to the furnace and install lockout tag before performing any maintenance or s

NOTE: Ensure the pressure switch tube disconnected from the pressure switch is higher than the collector box opening or water will flow out of tube.

NOTE: Do NOT blow into tube with tube connected to the pressure switch.

Cleaning Condensate Drain and Trap

NOTE: If the condensate trap is removed, a new gasket between the trap and collector box is required. Verify a condensate trap gasket is included in the service kit or obtain one from your local distributor

NOTE: If condensate has a heat pad attached to the trap, trace the wires for the pad back to the connection point and disconnect the wires for the heat pad.

To re-install Condensate Drain and Trap:

Checking Heat Pad Operation (If Applicable)

NOTE: The Heat Pad, when used, should be wrapped around the condensate drain trap. There is no need to use heat tape within the furnace casing. Most heat tapes are temperature activated, and it is not practical to verify the actual heating of the tape. Ch

Cleaning Heat Exchangers

Primary Heat Exchangers

If the heat exchangers get an accumulation of light dirt or dust on the inside, they may be cleaned by the following procedure:

NOTE: If the heat exchangers get a heavy accumulation of soot and carbon, both the primary and secondary heat exchangers should be replaced rather than trying to clean them thoroughly due to their intricate design. A build--up of soot and carbon indicates

WARNING: ELECTRICAL SHOCK, FIRE OR EXPLOSION HAZARD Failure to follow this warning could result in personal injury or death, or property damage. Before installing, modifying, or servicing system, main electrical disconnect switch must be in the OFF positi

WARNING: ELECTRICAL SHOCK AND FIRE HAZARD Failure to follow this warning could result in personal injury, death, and/or property damage. Turn off the gas and electrical supplies to the furnace and install lockout tag before performing any maintenance or s

NOTE: Burner cover, manifold, gas valve, and burner assembly should be removed as one assembly

NOTE: After cleaning, inspect the heat exchangers to ensure they are free of all foreign objects that may restrict flow of combustion products

WARNING: FIRE OR EXPLOSION HAZARD Failure to follow this warning could result in personal injury, death, and/or property damage. Never purge a gas line into a combustion chamber. Never test for gas leaks with an open flame. Use a commercially available so

Secondary Heat Exchangers

WINTERIZATION

CAUTION: UNIT AND PROPERTY DAMAGE HAZARD Failure to follow this caution may result in unit component or property damage. If the furnace is installed in an unconditioned space where the ambient temperatures may be 32_ F (0_ C) or lower, freeze protection m

Since the furnace uses a condensing heat exchanger, some water will accumulate in the unit as a result of the heat transfer process. Therefore, once it has been operated, it cannot be turned off and left off for an extended period of time when temperature

CAUTION: UNIT COMPONENT DAMAGE HAZARD Failure to follow this caution may result in damage to the furnace and other property damage. Do not use ethylene glycol (automotive antifreeze coolant or equivalent). Failure of plastic components may occur.

Fig. 56 -- Igniter Position -- Top View

Fig. 57 -- Igniter Position -- Side View

Fig. 58 -- Priming Condensate Trap

Fig. 59 -- Cleaning Heat Exchanger Cell

Fig. 60 -- Burner Flame

Fig. 61 -- Blower Assembly

Fig. 62 -- Burner Assembly