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(9.) Clean burner assembly using vacuum cleaner with soft brush attachment.

(10.) Reinstall cell inlet plates and burner assembly. Care must be exercised to center the burners in the cell openings.

9. After cleaning flue openings, check sealant on flue collector to ensure that it has not been damaged. If new sealant is needed, contact your

dealer or distributor.

10. Clean and replace flue collector assembly, making sure all 8 screws are secure.

11. Reinstall relief box.

12. Reconnect wires to the following components.

a. Draft safeguard switch

b. Inducer motor

c. Pressure switch

d. Limit overtemperature switch(es)

e. Gas valve

f. Hot surface ignitor

g. Flame-sensing electrode

13. Reconnect vent pipe to relief box. Replace vent pipe enclosure (downflow/horizontal furnace only).

14. Replace blower access door only.

15. Turn on electrical power and gas.

16. Set thermostat and check furnace for proper operation.

WARNING: Never use a match or other open flame to check for gas leaks. Use a soap-and-water solution. A failure to

follow this warning could result in fire, personal injury, or death.

17. Check for gas leaks.

18. Replace control access door on upflow furnace.

19. On downflow/horizontal furnaces, remove blower access door, replace control access door first, then replace blower access door and secure

with screw in front of door.

D.

Electrical Controls and Wiring

CAUTION: There may be more than 1 electrical supply to the unit. Check accessories and cooling unit for additional

electrical supplies.

The electrical ground and polarity for 115-v wiring must be maintained properly. Refer to Fig. 10 for field wiring information and to Fig. 12 for
unit wiring information.

NOTE:

If the polarity is not correct, the STATUS LED on the control center will flash rapidly and prevent the furnace from operating. The control

system also requires an earth ground for proper operation of the control board and flame-sensing electrode.

The 24-v circuit contains an automotive-type, 3-amp fuse located on the control board. (See Fig. 11.) Any direct shorts of the 24-v wiring during
installation, service, or maintenance will cause this fuse to blow. If fuse replacement is required, use ONLY a fuse of identical size.

With power to the unit disconnected, check all electrical connections for tightness. Tighten all screws on electrical connections. If any smoky or
burned connections are found, disassemble the connection, clean all parts, strip wire, and reassemble properly and securely.

Reconnect electrical power to the unit and observe unit through 1 complete operating cycle. Electrical controls are difficult to check without proper
instrumentation; if there are any discrepancies in the operating cycle, contact your dealer and request service.

For an explanation of fault codes, refer to service label located on blower access door or Fig. 13, and the troubleshooting guide.

The control center stores 1 fault code (the last fault to occur) for a period of 48 hr or until the 115- or 24-v power is interrupted.

NOTE:

Removing blower access door will open blower access door switch and terminate 115-v power to control center, and fault code will be

erased. Look into blower access door sight glass for current LED status.

1. To retrieve fault code, proceed with the following:

NOTE:

NO thermostat signal may be present at control center, and all blower time delay off periods must be completed.

a. Leave 115-v power to furnace turned on.

b. Look into blower access door sight glass for current LED status.

NOTE:

Leave blower access panel installed to maintain power to control center to view current LED status.

c. Remove control access door.

d. BRIEFLY remove either wire from the main limit switch until LED goes out, then reconnect it.

NOTE:

If wire to main limit is disconnected longer than 4 sec, main blower starts, and retrieval request is ignored.

2. When above items have been completed, the following will occur:

—7—

Summary of Contents for GB1AAV

Page 1: ...en working on heating equipment observe precautions in the literature on tags and on labels attached to or shipped with the unit and other safety precautions that may apply Follow all safety codes In...

Page 2: ...ouch ungrounded objects recharge your body with static electricity firmly touch furnace again before touching control or wires 5 Use this procedure for installed and uninstalled ungrounded furnaces 6...

Page 3: ...th sides of the furnace d Slide filter s out e Replace filter if torn or disposable type If furnace is equipped with permanent washable filters Clean filters with tap water Spray water through filter...

Page 4: ...6 Model GB1AAV Upflow A92063 C OM 24V HUM G R Y W DRAFT SAFEGUARD SWITCH FLUE COLLECTOR BOX MOUNTING SCREWS RELIEF BOX CONTROL BOARD FILTER RETAINER WASHABLE FILTER Fig 7 Model GB3AAV Downflow A92064...

Page 5: ...on blower wheel blades The blower wheel should not be dropped or bent as balance will be affected 14 Reinstall blower wheel by reversing items 12 a through c Be sure wheel is positioned for proper rot...

Page 6: ...h heat exchanger cell 1 Attach variable speed reversible drill to end of steel spring cable end opposite brush 2 Insert brush end of cable into upper opening of cell and slowly rotate with drill DO NO...

Page 7: ...d for proper operation of the control board and flame sensing electrode The 24 v circuit contains an automotive type 3 amp fuse located on the control board See Fig 11 Any direct shorts of the 24 v wi...

Page 8: ...on thermostat connection block See Fig 11 NOTE If TEST to Com terminals are jumpered longer than 2 sec LED will flash rapidly and retrieval request will be ignored e Component Test will function as de...

Page 9: ...IGHT HARNESS CONNECTOR 24 V TRANSFORMER SEC 2 SPARE 1 SPARE 2 EAC 1 EAC ELECTRONIC AIR CLEANER TERMINALS 115 VAC 1 5 AMP MAX EAC 2 115 VAC L2 NEUTRAL CONNECTION 24 V THERMOSTAT TERMINALS BLOWER SPEED...

Page 10: ...MPONENT TEST TWIN TERMINAL TRAN TRANSFORMER 115VAC 24VAC JUNCTION UNMARKED TERMINAL PCB TERMINAL FACTORY WIRING 115VAC FACTORY WIRING 24VAC FIELD WIRING 115VAC FIELD WIRING 24VAC CONDUCTOR ON PCB FIEL...

Page 11: ...lay 33 LIMIT OR FLAME ROLL OUT SWITCH IS OPEN If open longer than three minutes code changes to 13 Check for Defective blower motor or start capacitor Dirty filter or restricted duct system Loose blow...

Page 12: ...tatus code The status code is a 2 digit number with the first digit determined by the number of short flashes and the second digit by the number of long flashes Once status code is determined the cont...

Page 13: ...ault is cleared Check for Stuck open gas valve solenoid or leak Defective control board 23 PRESSURE SWITCH WILL NOT OPEN Check for Disconnected or obstructed pressure tubing Defective pressure switch...

Page 14: ...t theory and skills programs is available using popular video based formats and materials All include video and or slides plus companion book Classroom Service Training plus hands on the products in o...

Page 15: ...15...

Page 16: ...1996 CAC BDP P O Box 70 Indianapolis IN 46206 sggb1a09 16 Book Tab 1 6a 4 8a Catalog No 92 33GB 1A23...

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