Daikin DZ20VC - Indoor Unit Troubleshooting (TXV) (Continued); Diagnostic Codes Reference

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SERVICING

41

DIAGNOSTIC CODES

INDOOR UNIT TROUBLESHOOTING FOR TXV APPLICABLE UNIT (MBVC**00AA-1)

Table of Contents

Table of Contents2
Important Information2
Notice2
Safe Refrigerant Handling2
Important Information3
Nomenclatures4
Product Identification4
Expansion Valves5
Accessories5
- Valid Switch Settings6
- Condensate Management Kits6
Testing Capacitor Resistance7
- Install the Control Board9
- Uninstall the Control Board9
Replacing the Control Board9
- Condensing Unit10
- Defrost Cycle10
- Heating10
System Operation10
- System Startup Test11
- Dehumidification11
- Set Thermostat to Charge Mode11
- Dehumidification Tips11
- Cool Settings12
- Error History12
- System Test12
- Daikin One+ System Advanced Features12
- Max Compressor Rps / Max Rps Offset13
- Heat Setting13
- Dehumidification Select13
- Cooling Cycle15
- Piping Diagram with TXV Applicable Indoor Unit15
- Troubleshooting17
Cooling Analysis Chart17
Heating Analysis Chart18
Servicing Table of Contents19
Servicing20
- Checking Thermostat and Wiring20
- Checking Voltage20
- Checking Transformer and Control Circuit21
- S-3E Daikin Communicating Thermostat21
  - Thermostat Wiring21
  - Two-Wire Outdoor, Four-Wire Indoor Wiring21
- Checking Compressor22
- Checking High Pressure Switch22
- Checking Indoor and Outdoor Hi/Low Pressure Sensor22
- Voltage and Pressure Characteristics22
- S-17A Resistance Test23
- S-17B Ground Test23
  - Testing Compressor Windings23
  - Testing Temperature Sensors and Eev Coil Resistance23
  - Basic Operation24
  - Motor Control Circuits24
- S-40A Mbvc**00Aa-1 Heater Control24
- Testing EEV Coil Resistance24
- S-40B DV**Pec Heater Control25
- Checking Heater Elements26
- Checking Heater Limit Control(S)26
- Electric Heater (Optional Item)26
  - Heater Kit Capacity Setting (DV*Pec)26
  - Setting with Communicating Thermostat26
  - Setting with Dip Switch26
- (Optional Electric Heaters)27
  - Electric Heater Capacity Btuh27
  - HEAT KIT NOMINAL Kw27
- S-61A Checking Heater Limit Control(S)27
- S-61B Checking Heater Fuse Link27
- Brazing Materials28
- Evacuation28
- Leak Testing (Nitrogen or Nitrogen-Traced)28
- Refrigeration Repair Practice28
- Charging29
- Final Charge Adjustment29
- Checking Compressor Efficiency30
- If These Symptoms Are Observed30
- Overfeeding30
- S-105B Thermostatic Expansion Valve30
- Superheat30
- Charging Table31
- Checking Subcooling31
  - Superheat and Subcooling Adjustment on Txv Applications31
  - Checking Thermostatic Expansion Valve Operation32
- Non-Condensables32
- Compressor Burnout33
- Refrigerant Piping33
  - Installation of Refrigerant Piping34
  - Installation of Refrigeration Piping from Vertical to Horizontal34
  - Heat Pump above Indoor Coil35
  - Outdoor Unit Is above the Indoor Unit35
  - Burying Refrigerant Lines36
  - Oil Trap36
  - Outdoor Unit Is below the Indoor Unit36
- Air Handler External Static37
- And/Or Static Pressure Drop Across Coils37
  - Total External Static37
  - Airflow Consideration38
- Coil Static Pressure Drop38
  - Auxiliary Alarm Switch39
  - Circulator Blower39
  - Communicating Board39
  - Indoor Unit Troubleshooting for Txv Applicable Unit39
  - Diagnostic Chart40
  - Electrostatic Discharge Precautions40
  - Fault Recall40
  - Diagnostic Codes41
  - Indoor Unit Control Board46
  - Troubleshooting-Indoor Unit for Eev Applicable Unit46
  - 2-Digit 7 Segment Displays49
  - Display Button Layout51
  - Fault Code History Navigation51
  - Mode Display Introduction51
  - Emergency Mode for Eev Applicable Indoor Unit55
  - Heating Emergency Mode55
- Emergency Mode56
  - Outdoor Control Board Settings56
  - Cooling Emergency Mode57
  - Default Factory Settings58
  - Cooling Emergency Mode Wiring for Txv Applicable Indoor Unit59
  - Indoor Unit Integrated Control Module59
Indoor Control Board Settings56
Setting the Mode Display-Outdoor Unit60
- Navigating through the Display Screens61
- SCREEN 0 (Display FAULT CODE)66
- SCREEN 1 (Display FAULT CODES)66
- Screen 2 (Monitor Mode)66
- 7-Segment Display-Outdoor Unit67
- Identification of Connectors on 20 SEER OD Control Board73
Troubleshooting-Outdoor Unit73
- Network Troubleshooting75
- Thermistor Resistance and Temperature Characteristics76
- R-410A Pressure Vs. Temperature Chart77
Pressure Vs Temperature Chart77
Required Liquid Line Temperature78
Liquid Line Temperature Chart78
Wiring Diagram79
- Indoor Unit for Txv Applicable Unit81
- Indoor Unit for Eev Applicable Unit (DV*Pec*)82
Ctk04 Addendum82
- System Start-Up Test84
- Cool Setup112
- Set Cooling Run Values (Cl Run Values)112
- Heat Setup112
- Set Heating Run Values (Ht Run Values)112

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