Carrier SUPRA 850Mt - Alternator and Refrigeration Troubleshooting

5-3
I
N
D
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C
A
T
I
O
N
/
T
R
O
U
B
L
E
P
O
S
S
I
B
L
E
C
A
U
S
E
S
 REFERENCE
SECTION
5.2
AL
TERN
A
TOR
(AUT
OMOTIVE
TYPE)
Alternato
r
fails to
charg
e
Limited chargi
ng system operating time
Battery condition
Alternato
r
belt loose/bro
ken
Loose, dirty, corroded terminals, or broken leads
Excessively worn, open or defective brushes
Open blocking diode
Regulator faulty
Open isolation diode
Open rotor (field coil)
Check
Check
4.4
Check/Repair
Check
Check
Check
Check
Replace
Low
or
uns
tea
dy
cha
rgi
ng
rate
Alte
rna
tor
bel
t
loo
se
Loose, dirty, corroded terminals, or broken leads
Excessi
vely worn,
sticky or
intermi
ttent
brush
es
Faulty regulator
Grounded or shorted turns in rotor
Open, grounded or shorted turns in stator
4.4
Check/Repair
Check
Check
Check
Replace
Excessi
ve charging rate
(as
evidenced by battery requiring too
frequen
t
refilli
ng) or
charge
indicator shows constant “charge
with engine idling”
Regulator leads loose, dirty, corroded terminals, or wires
broken
Defective regulator
Clean/Repair
Check
N
o
i
s
y
a
l
t
e
r
n
a
t
o
r
D
e
f
e
c
t
i
v
e
o
r
b
a
d
l
y
w
o
r
n
V
-
b
e
l
t
Worn bearing(s)
Misaligned belt or pulley
Loose pulley
4.4
Replace
4.4
Tighten
5.
3
RE
FR
IGE
RA
TIO
N
5.
3.
1
Un
it
wi
ll
no
t
co
ol
D
i
e
s
e
l
e
n
g
i
n
e
M
a
l
f
u
n
c
t
i
o
n
(
s
)
5
.
1
Co
mp
re
ss
or
ma
lf
un
ct
io
n
Co
mp
re
ss
or
dr
iv
e
de
fe
ct
iv
e
Compressor defective
4.9
4.9
R
e
fr
i
g
e
ra
ti
o
n
s
y
st
e
m
D
e
fr
o
s
t
cy
c
l
e
d
i
d
n
o
t
te
rm
i
n
a
te
Abnorma
l pressure
Hot gas valve malfunction
5.3.5
5.3.6
5.3.11
5.
3.
2
Un
it
run
s
but
ha
s
ins
uff
ic
ie
nt
coo
lin
g
C
o
m
p
r
e
s
s
o
r
C
o
m
p
r
e
s
s
o
r
v
a
l
v
e
s
d
e
f
e
c
t
i
v
e
Unloader malfunction
4.9
4.11
R
e
f
r
i
g
e
r
a
ti
o
n
s
y
s
t
e
m
A
b
n
o
r
m
a
l
p
r
e
s
s
u
r
e
Expansion valve malfunction
No or restricted evaporator airflow
Unloader malfunction
5.3.6
5.3.10
5.3.9
4.11
Engine
does
not d
evelo
p ful
l rpm
Speed
control
linka
ge
Engine malfunction
4.3.4
5.1