FORM 100.10-NOM2
63
YORK INTERNATIONAL
TROUBLESHOOTING
DRIVE NOISE
BEARING NOISE
HIGH VELOCITY AIR NOISE
RATTLE OR WHISTLING NOISE
IN AIR STREAM
CFM LOWER THAN REQUIRED
Sheave(s) not tight on shaft(s) (motor or fan). Tighten sheave(s).
Belts hitting belt guard. Adjust or tighten belt guard mounts.
Belts loose. Adjust to proper tension. Belts should be checked twice during
first days operation and periodically thereafter.
Belts too tight. Adjust to proper tension.
Belts are wrong cross section to fit sheaves. Install proper belts.
Belts not matched in length on multi-belt drive. Install matched belts.
Misaligned sheaves. Align sheaves properly.
Belts worn. Replace belts.
Motor, motor base or fan not securely anchored. Anchor loose components
as required.
Belts oily or dirty. Clean or replace belts.
Defective bearing. Repair or replace bearing.
Bearing needs lubrication. Lubricate bearing as required.
Bearing loose on bearing support. Tighten bearing support bolts.
Bearing loose on shaft. Tighten bearing to shaft.
Bearing misaligned (check alignment binding.) Align properly.
Foreign material inside bearing. Disassemble, inspect and clean or
replace bearing as required.
Fretting corrosion between bearing inner race and shaft. Clean or replace
bearing as required.
Ductwork too small. Increase duct sizes to obtain proper air velocity.
Fan running too fast. Check for proper fan RPM.
Static pressure lower than expected. Reduce fan speed to obtain desired
flow rate.
Registers and grilles too small. Install correct registers and grilles as
required.
Dampers obstructed. Remove obstruction.
Diffusers obstructed. Remove obstruction.
Loose dampers or splitters. Tighten as required.
Loose grilles. Tighten grilles as required.
Sharp elbow(s). Install elbow(s) with larger turning radius.
Sudden expansion or contraction of ductwork. Install proper ductwork
transitions.
Turning vanes loose or not properly installed. Tighten and / or reinstall as
required.
Fan wheel installed backwards. Install in correct position.
Fan wheel rotating backwards. Reverse any two power leads to fan, to
change rotation.
Fan wheel not centered in inlet cones. Realign fan to center of inlet cones.
Fan speed too slow. Check for proper fan RPM.
Actual duct system has more resistance to flow than originally designed.
Enlarge ductwork or remove restrictions to match design requirements.
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