Installation Instructions

14
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"
SYMPTOM
System will not start Compressor will not start - fan runs Compressor and Condenser Fan will not start Evaporator fan will not start Condenser fan will not start Compressor runs - goes off on overload Compressor cycles on overload System runs continuously - little cooling Too cool and then too warm Not cool enough on warm days Certain areas to cool others to warm Compressor is noisy Low suction pressure Low head pressure High suction pressure High head pressure
Test Method
Remedy
Power Failure
•
Test Voltage
Blown Fuse
•••
Im
p
act Fuse Size & T
yp
e
Loose Connection
• •••
Ins
p
ect Connection - Ti
g
hten
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 Voltmete
r
Shorted or Open Capacitor
• •••
Test Ca
p
acito
r
Internal Compressor Overload Open
•
Test Continuity of Overload
Shorted or Grounded Compressor
••
Test Motor Windings
Compressor Stuck
••
Use Test Cord
Faulty Compressor Contactor
••• •
Test Continuit
y
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 Windin
g
s
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
•
Re
p
lace 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
••
Refi
g
ure Coolin
g
Load
Broken Internal Parts
•
Re
p
lace Com
p
resso
r
Broken Valves
•
Test Compressor Efficiency
Inefficient Compressor
•••
Test Compressor Efficiency
High Pressure Control Open
•
Reset and Test Control
Unbalanced Power, 3PH
•••
Test Volta
g
e
Wrong Type Expansion Valve
•• •
Re
p
lace Valve
Expansion Valve Restricted
••• • ••
Replace Valve
Oversized Expansion Valve
••
Replace Valve
Undersized Expansion Valve
••• • •
Replace Valve
Expansion Valve Bulb Loose
••
Ti
g
hten Bulb Bracket
Inoperative Expansion Valve
•• •
Check Valve O
p
eration
Loose Hold-down Bolts
•
Tighten Bolts
No Cooling
System
Operating
Pressures
U NITS WITH ROTARY OR RECIPROCATING COMPRESSORS AND NON - BLEED TXV’ S REQUIRE A H ARD S TART K IT .