Bryant DuraPac Series 580f - Manual (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
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
CAUTION: When working on gas train, do not hit or
plug orifice spuds.