Daikin DCH072 SERIES User Manual

18
SERVICING
DCC***XXX**XXX
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 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 cool ing Too cool and then too warm Not cool enough on warm days Certain areas too cool, others too warm Compressor is noisy Low suction pressure High sucti on pressure High head pressure
Test Method
Remedy
See Service Procedure Ref.
Power Failure
•
Test Voltage S-1
Blown Fuse
•••
Inspect Fuse Size & Type S-1
Unbalanced Power, 3PH
•••
Test Voltage S-1
Loose Connection
•••
Inspect Connection - Tighten S-2, S-3
Shorted or Broken Wires
••••••
Test Circuits With Ohmmeter S-2, S-3
Open Fan Overload
••
Test Continuity of Overload S-17A
Faulty Thermostat
••• •
Test Continuity of Thermostat & Wiring S-3
Faulty Transformer
••
Check Control Circuit with Voltmeter S-4
Shorted or Open Capacitor
•••••
Test Capacitor S-15
Internal Compressor Overload Open
•
Test Continuity of Overload S-17A
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
Faulty Fan Relay
•
Test Continuity of Coil And Contacts S-7
Open Control Circuit
•
Test Control Circuit with Voltmeter S-4
Low Voltage
•••
Test Voltage S-1
Faulty Evap. Fan Motor
••
Repair or Replace S-16
Shorted or Grounded Fan Motor
••
Test Motor Windings S-16
Improper Cooling Anticipator
••
Check Resistance of Anticipator S-3B
Shortage of Refrigerant
•• •
Test For Leaks, Add Refrigerant S-101,103
Restricted Li quid Line
•• • •
Remove Restriction, Replace Restricted Part S-112
Dirty Air Filter
••••
Inspect Filter-Clean or Replace
Dirty Indoor Coil
••••
Inspect Coil - Clean
Insufficient air across Indoor Coil
••••
C
heck Blower
S
peed and Rotation, Belt, Pulleys
,
Duct Static Filter
S
-
200
,
20
5,
206 207
Too much air across Indoor Coil
•
Reduce Blower Speed, Check Pulley Adjustment S-205, 207
Overcharge of Refrigerant
•• • ••
Recover Part of Charge S-113
Dirty Outdoor Coil
••• • •
Inspect Coil - Clean
Noncondensibles
•• • •
Recover Charge, Evacuate, Recharge S-114
Recirculation of Condensing Air
•• • •
Remove Obstruction to Air Flow
Infi ltration 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 S-115
Broken Valves
•••
Test Compressor Efficiency
S-104
Inefficient Compressor
••
Test Compressor Efficiency S-104
Expansion Device Restricted
••• • • •
Remove Restriction, Replace Expansion Device 111
Loose Hold-down Bolts
•
Tighten Bolts
Flowrato r Not Seating Pr operly
••
Check Flowrator & Seat or Replace Flowrator S-111
•
No Cooling
Cooling Cycle
COOLING ANALYSIS CHART
Unsatisfactory
Cooling

Daikin DCH072 SERIES Specifications

General

Brand	Daikin
Model	DCH072 SERIES
Category	Heat Pump
Language	English