Bryant DuraPac Series 580f User Manual download pdf (Page 49)

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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*

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.

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.

LED INDICATION ERROR CODE DESCRIPTION

ON Normal Operation

OFF Hardware Failure

1Flash† Evaporator Fan On/Off Delay Modified

2Flashes Limit Switch Fault

3Flashes Flame Sense Fault

4Flashes 4 Consecutive Limit Switch Faults

5Flashes Ignition Lockout Fault

6Flashes Induced-Draft Motor Fault

7Flashes Rollout Switch Fault

8Flashes Internal Control Fault

9Flashes Internal Software Processor Fault

CAUTION: When working on gas train, do not hit or

plug orifice spuds.

1 2 ... 44 45 46 47 48 49 50 51 52 53 54 ... 63 64

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Bryant DuraPac Series 580f User Manual Page 49

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