Bryant 580F User Manual

Page 67

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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

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.

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*

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.

CAUTION: When working on gas train, do not hit

or plug orifice spuds.

LED INDICATION

ERROR CODE DESCRIPTION

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

Fig. 50 — Burner Tray Details

BURNER
SECTION

ROLLOUT
SWITCH

INDUCED-DRAFT
MOTOR

FLUE
EXHAUST

VESTIBULE
PLATE

MANIFOLD
PRESSURE TAP

GAS VALVE

GAS VALVE
FLATS

Fig. 49 — Burner Section Details