Trane GRAA - Electrical Connections; Electrical Safety Warnings; Wiring Diagram Reference

PROBLEM
PROBABLE
CAUSE
SOLUTION
2. CFM
Low
Filters
Dirty
or clogged.
I n
s u
f f ic
i en t
Air
Fl ow
C o i l - DX
or Chi l le d W ate r
D i
rt y or clogge
d .
Obst
ru
ctions
i n Hig h Velocity
A i r St r ea m
a. Obstruction near
un
it
o u t l e t .
b . Sharp elbows
nea r
u
n i t
o
ut let.
c. Improperly designed
turning vanes.
d.
Projections,
dampers
or other
obstructions in part
of d uc t syste
m
whe
r e air ve l ocity i
s
h igh.
3. C
F
M H igh -
Sys t e m
T
oo
M
uch A i r F low
Blower
4.
B
lower D oes
N o t O pe r a t e In
s
t allation
U n i t
a. Oversized
duct work..
b. Access
door open.
c. Registers
or grilles not installed.
d. Filters not
in
place.
e. System resistance
lowe r than
a
nticipated.
Blower
RPM is too
great.
a.
Incorrect
electrical connection.
b . Wrong voltage.
c.
B
lown fuse.
a.
Br
o
k
e
n belt(s).
b . L
oose
pulleys.
c. P owe r t o unit is
d
isco
n
necte
d .
d.
M
o
t
or overloa
d
protector
h as br oken c i rcui t .
e. Optional t hermostats,
firesta
t
s, f reezestats m ay
l ockou
t b
lower
operation i f se t in
co
rr
ec
t .
TROUBLESHOOTING
GUIDE
ELECTRIC
MOTORS
PR OBLEM PROBABLE
CAUSE
SOLUTION
1 .
M
o
t
or B
lown f u
se o
r
o p e n circuit
b
r
ea
k
e
r .
R eplace f use
o
r r
eset
circui
t b
reake
r .
O
verloa
d t rip.
Chec k and
rese t , i f
m anual.
Improper line
connections.
Check connec ti
o
n
s
t
o u
nit wiring
diagram.
Im proper c
u
r r en t supply.
C
heck to
determine t ha t p owe r supp l y agrees with
m
oto
r n a m ep l ate specifica t ions.
M ec h an i cal fai lu re.
D etermine
t hat mo t o r and dri ve t urn f reely.
Check bearings.
M
o
t or ove
rl oaded.
W
it
h a
3
phase power
sou r ce, one
phase
may
be open.
Reduce load or replace motor.
Check line
for open phase.
Defective capacitor.
Replace capacitor.
2. Motor
Stalls
Wrong application.
Con
su
lt manufacturer.
Overloaded motor.
Reduce
load or rep
l
ace motor.
Low line voltage.
Check across AC line and correct
if possible.
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