15
UNIT TROUBLESHOOTING INFORMATION
For detailed service information refer to the Remote Condensing Unit Service manual.
Complaint
Unsatisfactory
Cooling
POSSIBLE CAUSE
DOTS IN ANALYSIS
GUIDE INDICATE
"POSSIBLE CAUSE"
SY
MP
T
O
M
Sy
s
te
m
w
ill n
o
t s
ta
rt
Comp
re
s
s
o
r wi
ll not
s
tar
t -
fan r
u
ns
Com
p
re
s
s
o
r and Con
d
en
s
e
r F
a
n
w
ill not s
ta
rt
E
v
apor
ator
fan wi
ll not
s
tar
t
Cond
ens
er
fan wi
ll not
s
tar
t
Comp
re
s
s
o
r r
u
n
s
-
go
es
off on
ov
er
lo
a
d
C
o
m
p
re
sso
r cycl
e
s
o
n
o
v
e
rl
o
a
d
S
y
s
tem r
u
ns
c
o
nti
nuous
ly
-
l
ittl
e c
o
ol
in
g
T
oo c
o
ol
an
d then to
o war
m
Not c
o
ol
enough
on war
m
day
s
Cer
tai
n ar
e
a
s
to c
o
o
l o
ther
s
t
o
war
m
C
o
m
p
re
sso
r i
s
n
o
isy
Lo
w
s
u
c
ti
on pr
es
s
u
re
Lo
w
h
e
ad pr
es
s
u
re
Hi
gh s
u
c
ti
o
n pr
es
s
u
re
Hi
gh hea
d pr
e
s
s
u
re
Test Method
Remedy
Power Failure
•
Test Voltage
Blown Fuse
•
•
•
Impact Fuse Size & Type
Loose Connection
•
•
•
•
Inspect Connection - Tighten
Shorted or Broken Wires
•
•
•
•
•
•
Test Circuits with Ohmmeter
Open Overload
•
•
Test Continuity of Overloads
Faulty Thermostat
•
•
•
•
Test Continuity of Thermostat and Wiring
Faulty Transformer
•
•
Check Control Circuit with Voltmeter
Shorted or Open Capacitor
•
•
•
•
Test Capacitor
Internal Compressor Overload Open
•
Test Continuity of Overload
Shorted or Grounded Compressor
•
•
Test Motor Windings
Compressor Stuck
•
•
Use Test Cord
Faulty Compressor Contactor
•
•
•
•
Test Continuity of Coil and Contacts
Faulty Fan Relay
•
Test Continuity of Coil and Contacts
Open Control Circuit
Test Control Circuit with Voltmeter
Low Voltage
•
•
•
Test Voltage
Faulty Evaporator Fan Motor
•
•
Repair or Replace
Shorted or Grounded Fan Motor
•
•
•
Test Motor Windings
Improper Cooling Anticipator
•
Check Resistance of Anticipator
Shortage or Refrigerant
•
•
•
•
Test For Leaks, Add Refrigerant
Restricted Liquid Line
•
•
•
•
Replace Restricted Part
Undersized Liquid Line
•
•
•
Replace Line
Undersized Suction Line
•
Replace Line
Not Enough Air across Indoor Coil
•
•
•
•
Speed Blower, Check Duct Static Pressure
Too Much Air across Indoor Coil
•
Reduce Blower Speed
Overcharge of Refrigerant
•
•
•
•
•
Recover Part of Charge
Noncondensibles
•
•
•
Recover Charge, Evacuate, Recharge
Recirculation of Condensing Air
•
•
•
Remove Obstruction to Air Flow
Infiltration of Outdoor Air
•
•
•
Check Windows, Doors, Vent Fans, Etc.
Improperly Located Thermostat
•
Relocate Thermostat
Air Flow Unbalanced
•
•
Readjust Air Volume Dampers
System Undersized
•
•
Refigure Cooling Load
Broken Internal Parts
•
Replace Compressor
Broken Valves
•
Test Compressor Efficiency
Inefficient Compressor
•
•
•
Test Compressor Efficiency
High Pressure Control Open
•
Reset and Test Control
Unbalanced Power, 3PH
•
•
•
Test Voltage
Wrong Type Expansion Valve
•
•
•
Replace Valve
Expansion Valve Restricted
•
•
•
•
•
•
Replace Valve
Oversized Expansion Valve
•
•
Replace Valve
Undersized Expansion Valve
•
•
•
•
•
Replace Valve
Expansion Valve Bulb Loose
•
•
Tighten Bulb Bracket
Inoperative Expansion Valve
•
•
•
Check Valve Operation
Loose Hold-down Bolts
•
Tighten Bolts
No Cooling
System
Operating
Pressures
NOTICE
Units with rotary or reciprocating compressors and non-bleed TXV’s
require a Hard Start Kit.
Содержание CONDENSING UNITAIR CONDITIONING
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