Trane GRCA - Venting, Ducting, and Gas Piping; Venting and Duct Connections; Gas Piping Safety and Installation

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 W heel
Hi
t
ti
n g S crol l
Side
a .
Bl ower Wheel n ot
ce
n te r e d in blowe r
housing.
b. Damaged
blower housing.
c .
D
a m age d
blower wheel.
d .
S h aft loose i n blowe r b earing.
e . B lowe r W hee l l oose o
n sha ft .
f . B lowe r
bearin
g l oose
i n
bea
r i n g sup p o rt .
Bl ower Wh eel Hitting Cut o ff a.
Cut
of f
n
o t
secure in
b
l owe r h ousing.
b. Cutoff damaged.
c. Cutoff improperly
positioned.
Dr
iv e a.
P ulley no t t igh t on s h a
ft (
m o
t
o r
a nd /o r b
lowe r
wheel).
b . Belts too loose .
Adjust for belt stretching
after 48
hours of operation .
c .
Belts to t i 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
B
ea
ring a.
D
e
f ective b eari n g.
b.
Needs
lubrication.
c .
Loose on bear i ng
support .
d .
Loose on shaft .
e.
Seals misaligned.
I.
Foreign material in bearing.
g .
Worn bearing .
h .
Frett i ng corros
i
on
between inner race and
shaft
.
Shaft Seal Squeal a.
Needs
lubrication.
b . M isa
l igne
d .
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