Troubleshooting - Trane GRAA Installation Operation & Maintenance

VII . TROUBLESHOOTING
For troubleshooting of the duct furnace, refer to Outdoor Rooftop Gas-Fired Duct Furnace Installation and Service
Manual. For Evaporative Cooler/Cooling Coil equipped units, refer to these specific manuals for additional trou-
bleshooting guides.
For additional troubleshooting, see following Troubleshooting Guide.
TROUBLESHOOTING GUIDE
AIR BLOWER
PROBLEM PROBABLE CAUSE SOLUTION
1 . N oise
B lowe r Wheel Hitti n g S crol l Side a . Bl ower Wheel n ot cen te red in blowe r housing.
b. Damaged blower housing.
c. Da m age d blower wheel.
d . S h aft loose i n blowe r b earing.
e. B lowe r Whee l l oose on shaft.
f. B lowe r bearin g l oose i n bea ri n g sup p o rt .
Bl ower Wh eel Hitting Cutoff
a. Cutoff not secure in bl owe r h ousing.
b. Cutoff damaged.
c. Cutoff improperly positioned.
Drive
a. P ulley not tight on s h aft (m oto r a nd/o r blowe r
wheel).
b. Belts too loose. Adjust for belt stretching after 48
hours of operation .
c. Belts to ti ght .
d. Belts wrong cross section.
e. Belts not matched in length on multi-belt drive.
f. Variable pitch pulleys not adjusted so each pulley
has same pitch diameter (multi-belt drives).
g . M i saligned pulleys .
h . Belts worn .
i . Motor or motor base loose.
j. Belts oily or dirty
k. Improper drive selection
Bea ring a. D efective b eari n g.
b. Needs lubrication.
c. Loose on beari ng support .
d . Loose on shaft.
e. Seals misaligned.
I. Foreign material in bearing.
g . Worn bearing .
h . Fretti ng corrosion between inner race and shaft .
Shaft Seal Squeal
a. Needs lubrication.
b. M isa l igne d .
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