Trane GXAA, Installation, Operation And Maintenance Manual

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MUA-SVX006B-EN 41
Troubleshooting
For troubleshooting of the duct furnace, refer to the Separated Combustion Indoor Gas-Fired
Duct Furnace Installation and Service Manual. For Evaporative Cooler/Cooling Coil equipped
units, refer to these specific manuals for additional troubleshooting guides.
For additional troubleshooting, see following Troubleshooting Guide.
Troubleshooting Guide — Air Blower
Problem Probable
Cause
Solution
Noise
Blower Wheel
Hitting Scroll Side
1. Blower Wheel not centered in blower
housing.
2. Damaged blower housing.
3. Damaged blower wheel.
4. Shaft loose in blower bearing.
5. Blower Wheel loose on shaft.
6. Blower bearing loose in bearing support.
Blower Wheel
Hitting Cutoff
1. Cutoff not secure in blower housing.
2. Cutoff damaged.
3. Cutoff improperly positioned.
Drive
1. Pulley not tight on shaft (motor and/or
blower wheel).
2. Belts too loose. Adjust for belt stretching
after 48 hours of operation.
3. Belts too tight.
4. Belts wrong cross section.
5. Belts not matched in length on multi-belt
drive.
6. Variable pitch pulleys not adjusted so each
pulley has same pitch diameter (multi-belt
drives).
7. Misaligned pulleys.
8. Belts worn.
9. Motor or motor base loose.
10.Belts oily or dirty
11.Improper drive selection
Bearing
1. Defective bearing.
2. Needs lubrication.
3. Loose on bearing support.
4. Loose on shaft.
5. Seals misaligned.
6. Foreign material in bearing.
7. Worn bearing.
8. Fretting corrosion between inner race and
shaft.
Shaft Seal Squeal
1. Needs lubrication.
2. Misaligned.