Installation Instructions

10
Troubleshooting Information
For detailed service information refer to the Remote Condensing Unit Service manual.
NOTICE
Units with rotary or reciprocating compressors and non-bleed TXV’s
require a Hard Start Kit.
Complaint
System
Operating
Pressures
POSSIBLE CAUSE
DOTS IN ANALYSIS
GUIDE INDICATE
"POSSIBLE CAUSE"
SYMPTOM
System will not start Compressor will not start - fan runs Comp. and Cond. Fan will not star t Evaporator fan will not start Condenser fan will not start Compressor runs - goes off on overload Compressor cycles on overl oad System runs continuously - little cooling/htg Too cool and then too warm Not cool enough on warm days Certain ar eas too cool, others too warm Compressor is noisy System runs - blows cold air in heating Unit will not terminate defrost Unit will not defrost Low suction pressure Low head pressure High suction pressure High head pressure
Test Method
Remedy
Power Failure
•
Test Volta
g
e
Blown Fuse
•••
Inspect Fuse Size & Type
Unbalanced Power, 3PH
•••
Test Voltage
Loose Connection
•••
Ins
p
ect Connection - Ti
g
hten
Shorted or Broken Wires
••••••
Test Circuits With Ohmmeter
Ope n Fan Overload
••
Test Continuit
y
of Overload
Faulty Thermostat
••• •
Test Continuity of Thermostat & Wiring
Faulty Transformer
••
Check Control Circui t with Voltmeter
Shorted or Open Capacitor
•••••
Test Ca
p
acitor
Internal Com
p
ressor Overload O
p
en
•
♦
Test Continuit
y
of Overload
Shorted or Grounded Compressor
••
Test Motor Windin
g
s
Compre sso r St uck
•••
♦
Use Test Cord
Faulty Compressor Contactor
•••
Test Continuity of Coil & Contacts
Faulty Fan Relay
•
Test Continuit
y
of Coil And Contacts
Open Control Circuit
•
Test Control Circuit with Voltmeter
Low Voltage
•••
Test Volta
g
e
Faulty Evap. Fan Motor
••
♦
Repair or Replace
Shorted or Grounded Fan Motor
••
Test Motor Windings
Improper Cooling Anticipator
••
Check Resistance of Antici
p
ator
Shortage of Refrigerant
••
♦
••
Test For Leaks, Add Refri
g
erant
Restricted Liquid Line
•• •• •
Remove Restriction, Re
p
lace Restricted Part
Open Element or Limi t on Elec. Heater
♦♦
Test Heater Element and Controls
Di rty Air Fil te r
••• •
♦
Ins
p
ect Filter-Clean or Re
p
lace
Dirty Indoor Coil
••• •
♦
Ins
p
ect Coi l - Clean
Not enough air across Indoor Coil
••• •
♦
Check Blower S
p
eed, Duct Static Press, Filter
Too much air across Indoor Coil
♦
•
Reduce Blower S
p
eed
Overcharge of Refrigerant
•• •
♦
••
Recover Part of Charge
Dirty Outdoor Coil
•• •
♦
•
Ins
p
ect Coi l - Clean
Noncondensibles
••
♦
•
Recover Char
g
e, Evacuate, Rechar
g
e
Recirculation of Condensing Air
•• •
Remove Obstruction to Air Flow
Infil trati on of Outdoor Ai r
•••
Check Windows, Doors, Vent Fans, Etc.
Improperly Located Thermostat
••
Relocate Thermostat
Air Flow Unbalanced
••
Read
j
ust Air Volume Dam
p
ers
System Undersized
••
Refi
g
ure Coolin
g
Load
Broken Internal Parts
•
♦
Re
p
lace Com
p
ressor
Broken Valves
•• ••
Test Com
p
ressor Efficienc
y
Inefficient Compre ssor
•
♦
••
Test Compressor Efficiency
Wrong Type Expansion Valve
••• • ••
♦
Re
p
lace Valve
Expansion Device Restricted
••• • •• •
Remove Restriction or Re
p
lace Ex
p
ansion Device
Oversized Expansion Valve
••
Re
p
lace Valve
Undersized Expansion Val ve
••• • •
Re
p
lace Valve
Expansion Valve Bulb Loose
••
Tighten Bulb Bracket
Inoperative Expansion Valve
•• •
Check Valve O
p
eration
Loose Hold-down Bolts
•
Ti
g
hten Bolts
Faulty Reversing Valve
•
♦♦ ♦ ♦♦♦
Re
p
lace Valve or Solenoid
Faulty Defrost Control
•
♦♦ ♦♦♦ ♦
Test Control
Faulty Defrost Thermostat
♦♦♦♦♦♦♦
Test Defrost Thermostat
Flowrator Not Seatin
g
Pro
p
erl
y
•••
Check Flowrator & Seat or Re
p
lace Flowrator
•
Cooling or Heating Cycle (Heat Pump)
♦
No Cooling Unsatisfactory Cooling/Heating
Heating Cycle Only (Heat Pump)