Daikin RR20AVAK9, Installation & Service Reference

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12
Troubleshooting Information
Complaint Unsatisfactory Cooling
POSSIBLE CAUSE
DOTS IN ANALYSIS
GUIDE INDICATE
"POSSIBLE CAUSE"
SYMP
T
O
M
Sy
st
em
wi
ll not s
tart
C
o
mpre
ss
or wi
ll n
o
t s
tart
- fa
n runs
C
o
mpre
ss
or and
C
o
nde
ns
e
r Fan
wi
ll not
s
tart
Ev
ap
orator fan will
not
s
tart
C
o
nde
ns
e
r fan
wi
ll no
t s
tart
C
o
mpre
ss
or runs
-
g
o
es
of
f on
ove
rload
C
o
mpre
ss
or c
yc
les
on
ove
rl
o
ad
Sy
st
em
ru
ns
c
o
nti
n
u
ous
ly
- l
it
tl
e c
o
ol
in
g
Too c
o
o
l a
nd th
en
too wa
rm
N
o
t c
o
ol
e
n
oug
h
on warm
da
ys
C
ertai
n are
as
to c
o
o
l ot
hers
to
warm
C
o
mp
re
ss
or
is
n
o
is
y
Lo
w
su
ct
io
n
p
re
ss
u
re
Lo
w
h
e
ad
p
res
su
re
H
igh
su
ct
io
n
p
re
ss
u
re
Hi
gh
he
ad p
re
ss
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
COOLING ANALYSIS CHART
No Cooling
System Operating
Pressures
For detailed service information refer to Remote Condensing Unit service manual.