Bryant 580F Ix. Combustion-Airblower, X. Limit Switch, Xi. Burner Ignition, Xii. Main Burners

IX. COMBUSTION-AIR BLOWER

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

To access burner section, slide the sliding burner partition out of the unit.

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 7 screws that attach induced-draft motor housing to vestibule plate (Fig. 45).

3.The blower wheel can be cleaned at this point. If ad- ditional 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 the motor 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.

X. LIMIT SWITCH

Remove blower access panel (Fig. 7). Limit switch is located on the fan deck.

XI. 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). The IGC contains a self-diagnostic LED (light-emitting diode). A single LED on the IGC provides a visual display of operational or sequential problems when the power supply is uninterrupted. When a break in power occurs, the IGC will be reset (resulting in a loss of fault history) and the indoor (evaporator) fan ON/OFF times will be reset. The LED error code can be observed through the viewport. During servicing refer to the label on the control box cover or Table 39 for an explanation of LED error code descriptions.

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

Table 39 — 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	Internal Software Processor Fault

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 41-43 for additional information.

XII. MAIN BURNERS

To access burners, remove burner access panel and slide out burner partition. At the beginning of each heating season, inspect for deterioration or blockage due to corrosion or other causes. Observe the main burner flames and adjust, if necessary.

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

A.Removal and Replacement of Gas Train (Fig. 45-47)

1.Shut off manual gas valve.

2.Shut off power to unit and tag disconnect.

3.Slide out burner partition.

4.Disconnect gas piping at unit gas valve.

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

6.Remove ignitor wires and sensor wires at the Inte- grated Gas Unit Controller (IGC) (see Fig. 11).

7.Remove the 2 screws that attach the burner rack to the vestibule plate (Fig. 45).

8.Slide the burner tray out of the unit (Fig. 46).

9.To reinstall, reverse the procedure outlined above.

B.Cleaning and Adjustment

1.Remove burner rack from unit as described in Removal and Replacement of Gas Train section, above.

2.Inspect burners; if dirty, remove burners from rack.

3.Using a soft brush clean burners and cross-over port as required.

4.Adjust spark gap. See Fig. 47.

5.Reinstall burners on rack.

6.Reinstall burner rack as described in Removal and Replacement of Gas Train section, above.

XIII. HIGH-PRESSURE SWITCH

Located on the compressor hot gas line is a high-pressure switch containing a Schrader core depressor. This switch opens at 428 psig and closes at 320 psig. No adjustment is necessary. Refer to Table 1.

XIV. LOSS OF CHARGE SWITCH

Located on the condenser liquid line is a low-pressure switch which functions as a loss-of-charge switch. This switch con- tains a Schrader core depressor. This switch opens at 7 psig and closes at 22 psig. No adjustment is necessary. Refer to Table 1.

XV. FREEZESTAT

Located on the “hair pin” end of the evaporator coil is a bimetal temperature sensing switch. This switch protects the evaporator coil from freeze-up due to lack of airflow. The switch opens at 30 F and closes at 45 F. No adjustment is necessary. Refer to Table 1.

XVI. REPLACEMENT PARTS

A complete list of replacement parts may be obtained from any Bryant distributor upon request.

—49—