32
SERVICING
COOLING ANALYSIS CHART
Com plaint
Sys te m
Ope rating
Pr e s s ure s
POSSIBLE CAUSE
DOTS IN ANALYSIS
GUIDE INDICATE
"POSSIBLE CAUSE"
SYM
PT
O
M
S
y
s
te
m
w
ill
n
o
t s
ta
rt
C
o
m
p
re
s
s
o
r w
ill n
o
t s
ta
rt
-
f
a
n
r
u
n
s
C
o
m
p
. and
C
ond.
F
an
w
ill n
o
t s
ta
rt
Ev
apor
at
or
f
an
w
ill n
o
t
s
ta
rt
C
ondens
er
f
an
w
ill n
o
t
s
ta
rt
C
o
m
p
re
s
s
o
r r
uns
-
goe
s
of
f on ov
er
load
C
o
m
p
re
sso
r cycl
e
s
o
n
o
v
e
rl
o
a
d
Sy
s
tem
r
u
n
s
c
ont
inuou
s
ly
-
li
tt
le c
ool
in
g
T
oo c
ool
an
d t
hen t
oo w
a
rm
N
o
t c
ool
eno
ugh on w
a
rm
day
s
C
e
rt
ai
n ar
ea
s
t
oo c
ool
, ot
her
s
t
oo
w
a
rm
C
o
m
p
re
sso
r i
s
n
o
isy
L
o
w
su
ct
io
n
p
re
ssu
re
L
o
w
head p
res
s
u
re
H
igh s
u
c
tio
n
pr
es
s
u
re
H
igh head p
res
s
u
re
Test Method
Reme dy
S
e
e
S
e
rv
ice
P
ro
ced
u
re R
e
f.
Pow er Failure
•
Test V oltage
S-1
Blow n Fuse
•
• •
Inspect Fuse Size & Type
S-4
Loose Connection
•
•
•
Inspect Connection - Tighten
S-2
Shorted or Broken Wires
• • • • • •
Test Circuits With Ohmmeter
S-3
Open Overload
•
• •
Test Continuity of Overload
S-17A
Faulty Thermostat
•
•
• •
Test continuity of Thermostat & Wiring
S-3
Faulty Transf ormer
•
•
Check control circuit w ith voltmeter
S-4
Shorted or Open Capacitor
•
• •
Test Capacitor
S-15
Shorted or Grounded Compressor
•
•
Test Motor Windings
S-17B
Compressor Stuck
•
•
Use Test Cord
S-17D
Faulty Compressor Contactor
• •
• •
Test continuity of Coil & Contacts
S-7, S-8
2nd Stage Compressor Not Energized
•
•
• •
Test Unloader Solenoid (2 stage compressor only)
S-17C
Faulty Ignition Control
•
Test Ignition Control
S-313
Open Control Circuit
•
Test Control Circuit w ith V oltmeter
S-4
Low V oltage
•
• •
Test V oltage
S-1
Faulty Evap. Fan Motor
•
•
Repair or Replace
S-16
Shorted or Grounded Fan Motor
•
•
Test Motor Windings
S-16
Improper Cooling A nticipator
•
•
Check resistance of A nticipator
S-3
Shortage of Ref rigerant
• •
• •
Test For Leaks, A dd Ref rigerant
S-103
Restricted Liquid Line
• •
• •
Replace Restricted Part
S-112
Dirty A ir Filter
•
• •
•
Inspect Filter-Clean or Replace
Dirty Indoor Coil
•
• •
•
Inspect Coil - Clean
Not enough air across Indoor Coil
•
• •
•
Speed Blow er, Check Duct Static Press
S-200
Too much air across Indoor Coil
•
Reduce Blow er Speed
S-200
Overcharge of Ref rigerant
• •
•
• •
Recover Part of Charge
S-113
Dirty Outdoor Coil
• •
•
•
Inspect Coil - Clean
Noncondensibles
•
•
•
Recover Charge, Evacuate, Recharge
S-114
Recirculation of Condensing A ir
•
•
•
Remove Obstruction to A ir Flow
Inf iltration of Outdoor A ir
•
• •
Check Window s, Doors, V ent Fans, Etc.
Improperly Located Thermostat
•
•
Relocate Thermostat
A ir Flow Unbalanced
•
•
Readjust A ir V olume Dampers
System Undersized
•
•
Ref igure Cooling Load
Broken Internal Parts
•
Replace Compressor
Inef f icient Compressor
•
• •
Test Compressor Ef f iciency
S-104
High Pressure Control Open
•
Reset A nd Test Control
S-12
Unbalanced Pow er, 3PH
•
• •
Test V oltage
Wrong Type Expansion V alve
• • •
•
• •
Replace V alve
Expansion Device Restricted
• • •
•
• •
Remove restriction or replace expansion device
Expansion V alve Bulb Loose
•
Tighten Bulb Bracket
Inoperative Expansion V alve
•
•
•
Check V alve Operation
S-110
Loose Hold-dow n Bolts
•
Tighten Bolts
No Cooling
Uns atis factory
Cooling
