Bryant 580F Xii. Flue Gas Passageways, Xiii. Combustion-Airblower, Xiv. Limit Switch

XII. FLUE GAS PASSAGEWAYS

To inspect the flue collector box and upper areas of the heat exchanger:

1.Remove the combustion blower wheel and motor assembly according to directions in Combustion-Air Blower section below.

2.Remove the flue cover to inspect the heat exchanger.

3.Clean all surfaces as required using a wire brush.

XIII. COMBUSTION-AIR BLOWER

Clean seasonally to assure proper airflow and heating effi- ciency. Inspect blower wheel every fall and periodically dur- ing heating season. For the first heating season, inspect blower wheel bimonthly to determine proper cleaning frequency.

To inspect blower wheel, shine a flashlight into draft hood opening. If cleaning is required, remove motor and wheel as follows:

1.Slide burner access panel out.

2.Remove the 6 screws that attach induced-draft motor housing to vestibule plate (Fig. 49).

3.The blower wheel can be cleaned at this point. If additional cleaning is required, continue with Steps 4 and 5.

4.To remove blower from the motor shaft, remove 2 setscrews.

5.To remove motor, remove the 4 screws that hold blower housing to mounting plate. Remove the motor cooling fan by removing one setscrew. Then remove nuts that hold motor to mounting plate.

6.To reinstall, reverse the procedure outlined above.

XIV. LIMIT SWITCH

Remove blower access panel (Fig. 1A and 1B). Limit switch is located on the fan deck. Verify operation of limit by tempo- rarily blocking return air until limit trips.

XV. BURNER IGNITION

Unit is equipped with a direct spark ignition 100% lockout system. Integrated Gas Unit Controller (IGC) is located in the control box (Fig. 11). Module contains a self-diagnostic LED. A single LED on the IGC provides a visual display of operational or sequential problems when the power supply is interrupted. When a break in power occurs, the module will

ROLLOUT

SWITCH

BURNER

SECTION

FLUE

EXHAUST

VESTIBULE

PLATE

INDUCED-DRAFT

MOTOR

MANIFOLD

PRESSURE TAP

GAS VALVE

GAS VALVE

FLATS

Fig. 49 — Burner Section Details

be reset (resulting in a loss of fault history) and the indoor (evaporator) fan ON/OFF times will be reset. For additional information, refer to the Start-Up, Heating section on page 51. The LED error code can be observed through the viewport. See Fig. 11. During servicing refer to the label on the control box cover or Table 36 for an explanation of LED error code descriptions.

If lockout occurs, unit may be adjusted by interrupting power supply to unit for at least 5 seconds.

XVI. MAIN BURNERS

At the beginning of each heating season, inspect for deterio- ration, blockage due to corrosion or other causes. Observe the main burner flames and replace burners if necessary.

CAUTION: When working on gas train, do not hit or plug orifice spuds.

A.Removal and Replacement of Gas Train (Fig. 49 and 50)

1.Shut off manual gas valve.

2.Shut off power to unit and install lockout tag.

3.Slide out burner section side panel (not shown).

4.Disconnect gas piping at unit gas valve using backup wrench on the flats of the valve body where the gas pipe enters the gas valve. See Fig. 49.

5.Remove wires connected to gas valve. Mark each wire.

Table 36 — LED Error Code Description*

LED INDICATION	ERROR CODE DESCRIPTION
ON	Normal Operation
OFF	Hardware Failure
1 Flash†	Evaporator Fan On/Off Delay Modified
2 Flashes	Limit Switch Fault
3 Flashes	Flame Sense Fault
4 Flashes	4 Consecutive Limit Switch Faults
5 Flashes	Ignition Lockout Fault
6 Flashes	Induced-Draft Motor Fault
7 Flashes	Rollout Switch Fault
8 Flashes	Internal Control Fault
9 Flashes	Software Lockout

LEGEND

LED — Light-Emitting Diode

*A 3-second pause exists between LED error code flashes. If more than one error code exists, all applicable codes will be displayed in numerical sequence.

†Indicates a code that is not an error. The unit will continue to operate when this code is displayed.

IMPORTANT: Refer to Troubleshooting Tables 38-40 for additional information.

Fig. 50 — Burner Tray Details

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