Daikin DX20VC Service Instructions Manual
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Daikin DX20VC Service Instructions Manual

Inverter condensing units with r-410a refrigerant blowers, coils, & accessories
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Service Instructions
DX20VC Inverter Condensing
Units with R-410A Refrigerant
Blowers, Coils, & Accessories
PROP 65 WARNING
WARNING
FOR CALIFORNIA CONSUMERS
Only personnel that have been trained to install, adjust, service
WARNING
or repair(hereinafter, "service") the equipment specified in this
manual should service the equipment. The manufacturer will
Cancer and Reproductive Harm -
not be responsible for any injury or property damage arising
www.P65Warnings.ca.gov
from improper service or service procedures. If you service this
0140M00517-A
unit, you assume responsibility for any injury or property dam-
age which may result. In addition, in jurisdictions that require
one or more licenses to service the equipment specified in this
manual, only licensed personnel should service the equipment.
Improper installation, adjustment, servicing or repair of the equip-
ment specified in this manual, or attempting to install, adjust,
service or repair the equipment specified in this manual without
proper training may result in product damage, property damage,
personal injury or death.
RSD6115001r11
November 2020
©2014-2016, 2020

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Summary of Contents for Daikin DX20VC

  • Page 1 Service Instructions DX20VC Inverter Condensing Units with R-410A Refrigerant Blowers, Coils, & Accessories PROP 65 WARNING WARNING FOR CALIFORNIA CONSUMERS Only personnel that have been trained to install, adjust, service WARNING or repair(hereinafter, “service”) the equipment specified in this manual should service the equipment. The manufacturer will...

  • Page 2: Table Of Contents

    For further assistance, please contact: 7-SEGMENT DISPLAY- OUTDOOR UNIT ....65 - 66 TROUBLESHOOTING - OUTDOOR UNIT....67 - 73 THERMISTOR RESISTANCE CONSUMER INFORMATION LINE - DAIKIN BRAND & TEMPERATURE CHARACTERISTICS ....74 PRODUCTS PRESSURE VS TEMPERATURE CHART ...... 75 TOLL FREE 1-855-770-5678 (U.S.

  • Page 3: Important Information

    Daikin approved Communicating Thermostats. Approved in place. Communicating Thermostats are Daikin One+ Smart Ther- If, however, the terminal protective cover is not properly in mostat and CTK04AE or newer. (Herein after referred to as place, a venting terminal may discharge a combination of "Thermostat")
  • Page 4 T - Two Stage Feature Set A - Base D - Deluxe N - Nominal 11,12 Engineering* Brand D - Daikin Single-Piece Major & Minor revisions Air Handler *Not used for inventory management Refrigerant Compatability 4 - R-410A Variable-Speed Motor Electric...

  • Page 5: Accessories

    ACCESSORIES EXPANSION VALVES DX20VC**1** Model Name TXV-Kit DX20VC0241** TXV-V24 DX20VC0361** TXV-V36 DX20VC0481** TXV-V48 DX20VC0601** TXV-V60 R410A - Max. 75°C (167°F) SS = 2°C (3.6°F) or according cation Number of turns Number of turns Number of turns Number of turns from SS to...
  • Page 6 ACCESSORIES DV**PEC HEATER KIT MODELS DV25PECB14A* DV37PECC14A* DV59PECD14A* DV61PECD14A* *Revision level that may or may not be designated. NOTE: Airflow selec�on should meet the minimum requirements as men�oned in the air handler installa�on instruc�ons. For heater kit installa�on, it is important to set the capacity of the electric heater at Set-up menu on thermostat and DIP switch on indoor unit control board.

  • Page 7: Testing Capacitor Resistance

    TESTING CAPACITOR RESISTANCE WARNING VOID CONTACT WITH THE CHARGED AREA •N EVER TOUCH THE CHARGED AREA BEFORE CONFIRMING THAT THE RESIDUAL VOLTAGE IS VOLTS OR LESS 1. S HUT DOWN THE POWER AND LEAVE THE CONTROL BOX FOR MINUTES 2. M AKE SURE TO TOUCH THE ARTH GROUND TERMINAL TO RELEASE THE STATIC ELECTRICITY FROM YOUR BODY TO PREVENT...
  • Page 8 TESTING CAPACITOR RESISTANCE WARNING VOID CONTACT WITH THE CHARGED AREA •N EVER TOUCH THE CHARGED AREA BEFORE CONFIRMING THAT THE RESIDUAL VOLTAGE IS VOLTS OR LESS 1. S HUT DOWN THE POWER AND LEAVE THE CONTROL BOX FOR MINUTES 2. M AKE SURE TO TOUCH THE ARTH GROUND TERMINAL TO RELEASE THE STATIC ELECTRICITY FROM YOUR BODY TO PREVENT...
  • Page 9 TESTING CAPACITOR RESISTANCE WARNING VOID CONTACT WITH THE CHARGED AREA •N EVER TOUCH THE CHARGED AREA BEFORE CONFIRMING THAT THE RESIDUAL VOLTAGE IS VOLTS OR LESS 1. S HUT DOWN THE POWER AND LEAVE THE CONTROL BOX FOR MINUTES 2. M AKE SURE TO TOUCH THE ARTH GROUND TERMINAL TO RELEASE THE STATIC ELECTRICITY FROM YOUR BODY TO PREVENT...

  • Page 10: Replacing The Control Board

    REPLACING THE CONTROL BOARD (2, 3, & 4 TON ONLY) Install the control board WARNING When working on a service port, ensure that no refrigerant and/or compressor oil is sprayed onto the control board. HIGH VOLTAGE This could damage the board’s functionality. DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS UNIT.

  • Page 11: System Operation

    DX20VC models are available in 2 through 5 ton sizes and This warming process causes the refrigerant to boil. The use R-410A refrigerant.
  • Page 12 For detailed functions www.daikinone.com. If using a CTK04 thermostat, please and menu layout, please visit the Daikin One+ Smart Thermo- see the addendum for further instructions. stat website at http://www.daikinone.com. (If using a CTK04 thermostat, please see the addendum for further instructions.)
  • Page 13 Please follow the following sequence to enter PUMP DOWN the website to accumulate the refrigerant to outdoor unit by 7 Segment “DAIKIN CITY (Installation Manual/Unitary Split Sys- Mode. Do not operate COOL ON mode to enter PUMP tem)” or DOWN. Before starting the PUMP DOWN operation, change “PartnerLink(InfoFinderPlus/Literature)”.
  • Page 14 In setting “C” the system runs fixed at 100% compressor and ual. The latest manual can be obtained from the website airflow. See Figure 1. “DAIKIN CITY (Installation Manual/Unitary Split System)” NOTE: In high humidity environments, sweating on supply or “PartnerLink(InfoFinderPlus/Literature)”.
  • Page 15 SYSTEM OPERATION COOLING CYCLE Piping Diagram with TXV applicable indoor unit (2 - 4 Ton) HP/LP Reversing Valve HP/LP sensor Ball Valve (Gas) Ta Thermistor Check valve separator Td Thermistor Motor Motor Thermistor Filter Accumulator Compressor Capillary tube Stop Valve Filter (Liquid) dryer...
  • Page 16 SYSTEM OPERATION COOLING CYCLE LEGEND: Tli = Thermistor (Indoor Liquid Temperature) Tl = Thermistor (Outdoor Liquid Temperature) Tgi = Thermistor (Indoor Gas Temperature) Td = Thermistor (Discharge Temperature) ID HP/LP sensor = Indoor High/Low Pressure Sensor Ta = Thermistor (Outdoor Air Temperature) OD HP/LP sensor = Outdoor High/Low Pressure Sensor Tm = Thermistor (Outdoor Coil Temperature) HPS = High Pressure Switch...

  • Page 17: Cooling Analysis Chart

    TROUBLESHOOTING COOLING ANALYSIS CHART POSSIBLE CAUSE X IN ANALYSIS GUIDE INDICATE "POSSIBLE CAUSE" Liquid stop valve does not fully open Gas stop valve does not fully open Line set restriction Line set length is too long Blocked filter-dryer ID EEV coil failure ID EEV failure Check valve failure –...
  • Page 18 S-106 OVERFEEDING ..........30 S-3A THERMOSTAT AND WIRING......19 S-107 UNDERFEEDING ..........30 S-3E DAIKIN COMMUNICATING THERMOSTAT ..19 S-108 SUPERHEAT ............30 CHECKING TRANSFORMER AND S-109 CHECKING SUBCOOLING ....... 31 CONTROL CIRCUIT .......... 20 S-110 CHECKING EXPANSION VALVE OPERATION . 32 S-12 CHECKING HIGH PRESSURE SWITCH...

  • Page 19: Servicing

    (O.D.T. and etc.). Also safety devices must be checked tric heaters to calculate temperature rise and air flow. Low for continuity. voltage may cause insufficient heating. S-3E DAIKIN COMMUNICATING THERMOSTAT S-2 CHECKING WIRING OVERVIEW WARNING The communication system is a system that includes a com-...

  • Page 20: Checking Transformer And Control Circuit

    SYSTEM WIRING THERMOSTAT WIRING S-4 CHECKING TRANSFORMER AND CONTROL CIRCUIT NOTE: Only use DAIKIN approved communicating thermo- stats. Approved communicating thermostats are DAIKIN WARNING ONE+ SMART THERMOSTAT and CTK04AE or newer. HIGH VOLTAGE...

  • Page 21: Checking High Pressure Switch

    SERVICING S-12 CHECKING HIGH PRESSURE SWITCH WARNING HIGH VOLTAGE DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL IN- JURY OR DEATH. The high pressure switch senses the pressure in the com- pressor discharge line.

  • Page 22: S-15B Capacitance Check (5 Ton Only)

    SERVICING B. Shorted - indicator swings to zero and stops there Ignition of the discharge can also occur at the venting ter- - replace. minal or inside the compressor, if there is sufficient contam- C. Open - no reading - replace. (Start capacitor would inant air present in the system and an electrical arc occurs read resistor resistance.) as the terminal vents.

  • Page 23: S-17B Ground Test

    SERVICING NOTE: The 2, 3 and 4 ton compressor has terminal on the 1. Disconnect the heater lead in wires. top. The 5 ton compressor has terminal on the side. 2. Using an ohmmeter, check heater continuity - should test continuous. If not, replace. S-17B GROUND TEST NOTE: The positive temperature coefficient crankcase heater is If fuse, circuit breaker, ground fault protective device, etc., has...

  • Page 24: S-40A Mbvc**00Aa-1 Heater Control

    SERVICING S-40A MBVC**00AA-1 HEATER CONTROL Electric Heat Sequencer Outputs Description WARNING The MBVC models utilize an electronic control that provides HIGH VOLTAGE ECM blower motor control and control of up to two electric DISCONNECT ALL POWER BEFORE SERVICING OR heat sequencers. The control has thermostat inputs for up to INSTALLING THIS UNIT.

  • Page 25: S-40B Dv**Pec Heater Control

    The new air handler control includes advanced diagnostic fea- WARNING tures with fault recall, estimated CFM display via 7 segment display of control board, Daikin One+™ and ComfortNetTM LINE VOLTAGE NOW PRESENT. ready. Diagnostics includes heater kit selection diagnostics, open fuse, internal control fault, data errors, and blower motor 2.

  • Page 26: Checking Heater Elements

    This limit control will open its circuit at approximately 150°F. to 160°F and close at approximately 110°F. For a detailed procedure of thermostat heater kit capacity selection process, please visit the DAIKIN ONE+ SMART THERMOSTAT website at http://www.daikinone.com (If us- WARNING ing a CTK04 thermostat, please see the addendum for fur- ther instructions.)

  • Page 27: S-61A Checking Heater Limit Control(S)

    SERVICING S-61B CHECKING HEATER FUSE LIN HEATER(kW) Model (OPTIONAL ELECTRIC HEATERS) DV25PECB14* Each individual heater element is protected with a one time DV37PECC14* 1000 1120 1220 1250 DV59PECD14* 1110 1200 1240 1520 1520 fuse link which is connected in series with the element. The DV61PECD14* 1030 1150 1250 1320 1650 1690 1715...

  • Page 28: Leak Testing (Nitrogen Or Nitrogen-Traced)

    SERVICING NOTE: The use of a heat shield when brazing is recom- Air in a system causes high condensing temperature and mended to avoid burning the serial plate or the finish on the pressure, resulting in increased power input and reduced unit.

  • Page 29: Charging

    SERVICING 3. If the vacuum pump is working properly, close the valve NOTE: R410A should be drawn out of the storage container to the vacuum thermocouple gauge and open the high or drum in liquid form due to its fractionation properties, but and low side valves to the high vacuum manifold set.

  • Page 30: S-105B Thermostatic Expansion Valve

    Ensure the thermometer makes adequate contact and is insulated THE VALVES PROVIDED BY DAIKIN ARE DESIGNED TO for best possible readings. Use liquid line temperature MEET THE SPECIFICATION REQUIREMENTS FOR OPTI- to determine subcooling and vapor temperature to de- MUM PRODUCT OPERATION.

  • Page 31: Checking Subcooling

    SERVICING EXAMPLE: The difference is 11° subcooling. See the specification sheet a. Suction Pressure = 143 psi or technical information manual for the design subcooling b. Corresponding Temp. = 50°F. range for your unit. c. Thermometer on Suction Line = 58°F. There are other causes for high head pressure which may To obtain the degrees temperature of superheat, subtract be found in the "Cooling/Heating Analysis Chart."...

  • Page 32: Checking Expansion Valve Operation

    SERVICING b. If subcooling is low and superheat is 7 to 9°F, add charge S-110 CHECKING EXPANSION VALVE OPERATION to rise subcooling to 8°F ± 1°F, then check superheat. c. If subcooling is low and superheat is high, add charge 1.

  • Page 33: Refrigerant Piping

    SERVICING NOTE: The Flushing Method using R-11 refrigerant is no IMPORTANT longer approved by Daikin Brand Heating-Cooling. To avoid overhea�ng the service valve, TXV, sensor, or filter drier while brazing, wrap the component with a wet rag, or S-120 REFRIGERANT PIPING use a thermal heat trap compound.
  • Page 34 SERVICING If hanging line set from a joist or rafter, use metal strapping Wire Tie or heavy nylon wire tires (around suction line only) that are securely anchored. 8’ Floor Joist or T ape or Wire Tie Roof Rafter 8’ Floor Joist or Roof Rafter Metal Sleeve Strapping placed...
  • Page 35 SERVICING Long Radius Street Ell 45° 45° Street Ell Short Radius Street Ell Figure 3-1. Oil Trap SECTION 4. OUTDOOR UNIT IS BELOW THE INDOOR UNIT 1. The maximum eleva�on (ver�cal) difference between the outdoor unit and the indoor unit is 90 feet. 2.

  • Page 36: Duct Static Pressures And/Or Static Pressure Drop Across Coils

    SERVICING S-202 DUCT STATIC PRESSURES AND/OR STATIC 4. Consult proper table for quantity of air. PRESSURE DROP ACROSS COILS If external static pressure is being measured on a furnace to This minimum and maximum allowable duct static pressure determine airflow, supply static must be taken between the for the indoor sections are found in the specifications sec- "A"...
  • Page 37 SERVICING System Opera�ng Airflow Demand System Mode Source Cooling Outdoor Unit Heat Pump Hea�ng Outdoor Unit Only Con�nuous Fan Thermostat Either Outdoof Unit HP + Electric Heat or Indoor Unit, Air Handler or Strips which has higher Modular Blower Airflow demand Electric Heat Strips Indoor Unit Only...
  • Page 38 SERVICING 24VAC Auxiliary Alarms FUSE Seven Segment Green CFM LED Dip Switches Communica�ng Board Auxiliary Alarm Switch Circulator Blower The control is equipped with two Auxiliary Alarm terminals, This air handler is equipped with a variable speed circulator labeled CAS, which are typically utilized in series with a con- blower.
  • Page 39 SERVICING INDOOR UNIT TROUBLESHOOTING FOR TXV APPLICABLE UNIT (MBVC**00AA-1) Diagnostic Chart NOTE: Upon start up in communicating mode the circuit board may display an “Ec” error. This is an indication that the dip switches on the control board need to be configured WARNING in accordance with the Electric Heating Airflow Table.
  • Page 40 SERVICING INDOOR UNIT TROUBLESHOOTING FOR TXV APPLICABLE UNIT (MBVC**00AA-1) DIAGNOSTIC CODES...
  • Page 41 SERVICING INDOOR UNIT ERROR CODES INDOOR UNIT TROUBLESHOOTING FOR TXV APPLICABLE UNIT (MBVC**00AA-1)
  • Page 42 SERVICING INDOOR UNIT ERROR CODES INDOOR UNIT TROUBLESHOOTING FOR TXV APPLICABLE UNIT (MBVC**00AA-1)
  • Page 43 SERVICING INDOOR UNIT ERROR CODES INDOOR UNIT TROUBLESHOOTING FOR TXV APPLICABLE UNIT (MBVC**00AA-1)
  • Page 44 SERVICING INDOOR UNIT ERROR CODES INDOOR UNIT TROUBLESHOOTING FOR TXV APPLICABLE UNIT (MBVC**00AA-1)

  • Page 45: Troubleshooting - Indoor Unit

    SERVICING TROUBLESHOOTING-INDOOR UNIT FOR EEV APPLICABLE UNIT WARNING HIGH VOLTAGE DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS UNIT. MULTIPLE POWER SOURC- ES MAY BE PRESENT. FAILURE TO DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH. A UXA LA R M AC C -OUT (Accessory) ACC -IN...
  • Page 46 SERVICING Troubleshooting Electrostatic Discharge (ESD) Precautions 7 Segment Diagnostic Fault Displays NOTE: Discharge body's static electricity before touching Recall unit. Electrostatics can adversely affect electrical compo- nents. Use the following precautions during air handler installation and servicing to protect the integrated control module from Fault Recall damage.
  • Page 47 SERVICING DIAGNOSTIC CODES DIAGNOSTIC CODES 7 SEGMENT LED DESCRIPTION OF CONDITION DISPLAY Normal Operation NO HTR KIT INSTALLED - SYSTEM CALLING FOR AUXILIARY HEAT (Minor Error Code) HEATER KIT DIP SWITCHES NOT SET PROPERLY FUSE OPEN AUXILIARY SWITCH OPEN DATA NOT ON NETWORK INVALID DATA ON NETWORK INVALID MEMORY CARD DATA BLOWER MOTOR NOT RUNNING...
  • Page 48 SERVICING TROUBLESHOOTING INDOOR UNIT FOR EEV APPLICABLE UNIT 2-digit 7 segment displays 7 Segment LED Descrip�on of Condi�on Display (State) (No Display) INTERNAL CONTROL FAULT/ NO POWER STANDBY, WAITING FOR INPUTS FAN COOL - COMMUNICATING MODE ONLY (Fan Demand-Cool) FAN HEAT - COMMUNICATING MODE ONLY (Fan Demand- Heat) FAN ONLY (Fan Demand-Manual) ELECTRIC HEAT LOW (Heat Demand, Back-up Heat Demand) digit 7 segment displays on indoor control board...
  • Page 49 SERVICING TROUBLESHOOTING INDOOR UNIT FOR EEV APPLICABLE UNIT 2-digit 7 segment displays 3. When the uni�s having some minor error code in normalmode, 2-digit 7 segmentdisplaysshow error code and air ow status. 2. Error code 3. Air ow 4. When the uni�s having some minor error code during defrost opera onin normalmode, 2-digit 7 segmentdisplaysshow state “dF”, error code and air ow status.
  • Page 50 SERVICING SETTING THE MODE DISPLAY TROUBLESHOOTING INDOOR UNIT FOR EEV APPLICABLE UNIT MODE DISPLAY INTRODUCTION A 2-digit display is provided on the Control Board as a backup tool to the thermostat for accessing error codes and erasing error code history of the indoor unit. Follow the informa�on provided in this sec�on to learn how to use the mode display.
  • Page 51 SERVICING SETTING THE MODE DISPLAY TROUBLESHOOTING INDOOR UNIT FOR EEV APPLICABLE UNIT <SCREEN ZER O> First Error Code Idle Release Fault Recall in less than 2 sec mins. Press Fault Recall for Error Code Second Error Code Hold Fault Recall for more than 2 sec Solid Display Press Fault Recall...
  • Page 52 SERVICING INDOOR UNIT (DV*PEC*) ERROR CODES...
  • Page 53 SERVICING INDOOR UNIT (DV*PEC*) ERROR CODES...
  • Page 54 SERVICING EMERGENCY MODE FOR EEV APPLICABLE INDOOR 1. HEATING EMERGENCY MODE UNIT Emergency Heating mode is to be used when communica- tion between the indoor unit and thermostat are not function- WARNING ing properly. This mode will run the electric heat strips inde- pendently of any thermostat in one of two modes: High Heat HIGH VOLTAGE Level or Low Heat Level.

  • Page 55: Emergency Mode

    SERVICING SERVICING Upon start up in emergency mode the circuit board may display an “Ed” error. This is an indication that the DIP switches on the control board need to be configured in accordance with the Electric Heating Airflow Table. Config- uring the DIP switches to the unit will clear the error code.
  • Page 56 SERVICING Dip Switch Posi�on 2. COOLING EMERGENCY MODE Func�on DS2-1 DS2-2 Cooling emergency mode is to be used when communica- tion between the indoor and outdoor units is not functioning Normal Opera�on properly and temporary cooling operation is required. This mode enables the outdoor unit and indoor unit to run inde- Emergency Mode pendently of each other.
  • Page 57 SERVICING Dipswitch Default Factory Se�ngs Switch # i t t No Use No Use Indoor Unit DS-1 No Use No Use No Use No Use Indoor Unit DS-2 No Use No Use Heater Kit Selec�on in Emergency Mode Heater Kit Selec�on in Emergency Mode Indoor Unit DS-3 Heater Kit Selec�on in Emergency Mode...
  • Page 58 SERVICING COOLING EMERGENCY MODE WIRING FOR TXV APPLICABLE INDOOR UNIT Cooling emergency mode is available when using a TXV applicable indoor unit. To energize the blower at the appro- priate speed, standard Legacy wiring is required. The image below shows how the thermostat input terminals are to be wired when selecting a cooling airflow.

  • Page 59: Setting The Mode Display-Outdoor Unit

    SETTING THE MODE DISPLAY-OUTDOOR UNIT MODE DISPLAY INTRODUCTION A 3-digit display is provided on the Control board as a backup tool to the thermostat for reading faults, fault history, monitoring and se ng up the unit. Follow the informa on provided in this sec on to learn how to use the mode display.
  • Page 60 SETTING THE MODE DISPLAY-OUTDOOR UNIT NAVIGATING THROUGH THE DISPLAY SCREENS SCREEN The home or default screen on the display. This shows the most recent fault. SCREEN 1 To access, hold the RECALL bu�on for 5 seconds at screen 0. SCREEN 2 To access, hold the RECALL bu�on for 5 seconds at screen 1.
  • Page 61 SETTING THE MODE DISPLAY-OUTDOOR UNIT FAULT CODE HISTORY NAVIGATION < SCREEN 1> This mode will allow the user to see the six most recent system faults. For a list of the fault codes, please see the TROUBLESHOOTING tables in this document. <...
  • Page 62 SETTING THE MODE DISPLAY-OUTDOOR UNIT MONITORING MODE NAVIGATION < SCREEN 0 > < SCR EEN 2 > This screen allows the user to monitor system variables as shown in the tables at the end of this sec�on. Blink interval: < SCREEN 1 >...
  • Page 63 SETTING THE MODE DISPLAY-OUTDOOR UNIT SETTINGS MODE 1 NAVIGATION < SCREEN 3 > < SCREEN 0 > Se�ng Mode 1 allows the user to adjust system se�ngs as shown in the tables at the end of this sec�on. Blink interval: <...
  • Page 64 SETTING THE MODE DISPLAY-OUTDOOR UNIT SETTINGS MODE 2 < SCREEN 4 > < SCREEN 0 > Se�ng Mode 2 allows the user to change system se�ngs. See table in back of this sec�on. Blink interval: 0.4 sec. On - 0.4 sec. Off <...

  • Page 65: 7-Segment Display- Outdoor Unit

    7 SEGMENT DISPLAY-OUTDOOR UNIT SCREEN 0 (Display FAULT CODE) Setting Fault code (present) SCREEN 1 (Display FAULT CODES) Setting SCREEN 2 (MONITOR MODE) Setting unit ： hr (Multiply by 200,) Compressor operation time 0: Stop 1. Cooling Start-up Operation code 3.
  • Page 66 If you want to change the Cool Airflow Trim to posi�ve side, be sure to confirm the Airflow Trim restric�ons in the latest indoor unit installa�on manual. The latest manual can be obtained from the website “DAIKIN CITY (Installa�on Manual/Unitary Split System)” or “PartnerLink(InfoFinderPlus/Literature)”. [DAIKIN CITY URL] h�ps://www.daikincity.com/Library/ [PartnerLink URL]...
  • Page 67 OUTDOOR UNIT ERROR CODES TROUBLESHOOTING ClimateTalk Control Board Transmitted Climate Fault Code LED Display Talk Message *1 • High electrical noise OD CTRL FAIL1 Indicates a general memory error. • Replace control board if necessary • Faulty control board • Blocked/restricted condenser coil and/or •...
  • Page 68 TROUBLESHOOTING OUTDOOR UNIT ERROR CODES ClimateTalk Control Board Transmitted Climate Thermostat Fault Probable Causes Corrective Actions Fault Code LED Display Talk Message*1 • Check discharge thermistor resistance • Discharge thermistor inoperable or and connections; Repair/replace as This error indicates the equipment is improperly connected needed experiencing frequent high discharge...
  • Page 69 TROUBLESHOOTING OUTDOOR UNIT ERROR CODES ClimateTalk Control Board Transmitted Fault Code LED Display ClimateTalk Message *1 • Blocked/restricted condenser coil and/or • Check and clean condenser coil and/or lines The control encountered an abnormal lines • Check the wire between control board and STARTUP ERROR condition during the startup •...
  • Page 70 TROUBLESHOOTING OUTDOOR UNIT ERROR CODES ClimateTalk Control Board Transmitted Climate Fault Code LED Display Talk Message *1 This error indicates the equipment is • Check and clean grille of any debris experiencing frequent outdoor control • Obstruction in fan rotation •...

  • Page 71: Troubleshooting-Outdoor Unit

    TROUBLESHOOTING-OUTDOOR UNIT Re-Writing Shared Data to Outdoor Unit 9. Turn the power ON to the outdoor unit. 10. Continue the operation of the unit as desired. Using Memory Card NOTE: Check Troubleshooting codes to determine the need to flash 1. If there is an error E11 on the 7-segment display of the shared data to outdoor unit.
  • Page 72 TROUBLESHOOTING-OUTDOOR UNIT Zoomed view of 20 SEER OD Control Board...
  • Page 73 TROUBLESHOOTING-OUTDOOR UNIT NETWORK TROUBLESHOOTING If a network communication error code has occurred, use the following steps to help troubleshoot the system. (For net- work communication error codes, refer to the table below and the tables of error codes for outdoor unit and indoor unit.) After any wiring changes have been made or DS1 dip switch- es on the outdoor unit control board have been changed,...

  • Page 74: Thermistor Resistance

    THERMISTOR RESISTANCE AND TEMPERATURE CHARACTERISTICS Tm : Coil Tl : Liquid Td : Discharge Ta : Ambient Tgi: Indoor Gas Tli: Indoor Liquid Thermistor Thermistor Thermistor Volts TEMP TEMP Volts Volts Resistance Resistance Resistance (°C) 364.43 4.58 4759.15 4.96 362.48 4.58 267.00 4.45...

  • Page 75: Pressure Vs Temperature Chart

    PRESSURE VS TEMPERATURE CHART R-410A Pressure vs. Temperature Chart PSIG °F PSIG °F PSIG °F PSIG °F PSIG °F PSIG °F -37.7 37.8 74.3 100.2 420.0 120.7 137.6 -34.7 38.7 74.9 100.7 422.0 121.0 137.9 -32.0 39.5 75.5 101.1 424.0 121.4 138.3 -29.4...

  • Page 76: Liquid Line Temperature Chart

    LIQUID LINE TEMPERATURE CHART Required Liquid Line Temperature REQUIRED SUBCOOLING TEMPERATURE (°F) LIQUID PRESSURE AT SERVICE VALVE (PSIG) 10 4...

  • Page 77: Wiring Diagrams

    WIRING DIAGRAM DX20VC0241**; DX20VC0361** Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
  • Page 78 WIRING DIAGRAM DX20VC20481** Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
  • Page 79 WIRING DIAGRAM DX20VC0601** Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
  • Page 80 WIRING DIAGRAM INDOOR UNIT FOR TXV APPLICABLE UNIT (MBVC*00AA-1) HIGH VOLTAGE! DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH. Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
  • Page 81 WIRING DIAGRAM INDOOR UNIT FOR EEV APPLICABLE UNIT (DV*PEC) HIGH VOLTAGE! DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH. RAM MONITOR FLASH WRITER SHARE DATA Wiring is subject to change.
  • Page 82 CKT04 ADDENDUM CTK04** COMFORTNET™ THERMOSTAT TWO-WIRE OUTDOOR, FOUR-WIRE INDOOR WIRING Overview Low voltage wiring consists of two wires between the indoor unit and outdoor unit and four wires between the indoor unit and the thermostat. The required wires are: (a) data lines, The ComfortNet™...
  • Page 83 CKT04 ADDENDUM Thermostat Menu Screen System Start-up Test NOTICE N INITIAL POWER START THE OUTDOOR UNIT WILL DISPLAY CODE E11, SYSTEM SIGNALING THAT INITIAL TEST MUST BE RUN OLLOW ™ OMFORT SETUP SCREEN TO ENTER APPLICATION UNIQUE INFORMATION OMFORT ET THERMOSTAT MANUAL FOR DETAILED INFORMATION A system test is now required to check the equipment settings and functionality.
  • Page 84 CKT04 ADDENDUM 4. From the MENU screen, scroll down and select COMFORTNET™ USER MENU. 5. Enter Installer password. (The password is the Date Code located on the thermostat and is available by entering the EQUIPMENT STATUS menu and scrolling to the bottom.) 6.
  • Page 85 CKT04 ADDENDUM 8. Next, scroll down and select EQUIP TEST. 9. Select SYSTEM TEST. 10. Select ON to run the SYSTEM TEST. Press DONE to initiate test. 11. Allow the system test to run for its duration (5-15 minutes). EQUIP TEST SCREEN will show the system test is ON once selected.
  • Page 86 CKT04 ADDENDUM 12. Press Previous Menu button and navigate to HOME screen and allow test to finish. The display similar to the one at the right will be displayed after SYSTEM TEST completes. Test is complete only when CODE 11 notice clears from BOTH the thermostat display AND the seven segment LED display on the outdoor unit.
  • Page 87 CKT04 ADDENDUM 3. Enter Installer password. (The password is the Date Code located on the thermostat and is available by entering the EQUIPMENT STATUS menu and scrolling to the bottom). 4. Select YES to continue. 5. Select Air Conditioner. 6. Select MAINTENANCE.
  • Page 88 CKT04 ADDENDUM 7. Select CHARGE MODE. 8. Select ON. Press DONE to initiate CHARGE MODE. (System will then run for 1 hour and either return to cooling mode if the thermostat is set for COOL mode, from the SYSTEM menu on the main screen.) If charging is not complete after 1 hour, repeat 7 and 8.
  • Page 89 CKT04 ADDENDUM BOOST MODE BOOST MODE enables the system to operate at increased compressor speed to satisfy unusual high loads. BOOST MODE is BOOST MODE is initiated by an outdoor tem- perature sensor located in the outdoor unit. Please note that outdoor equipment operational sound levels may increase while the equipment is running in BOOST MODE.
  • Page 90 CKT04 ADDENDUM 3. Enter Installer password if known. a. The password is the thermostat date code and can obtained by selecting the red Cancel button and selecting the Dealer information button. b. Once recorded, click the green OK button and return to the previous step.
  • Page 91 CKT04 ADDENDUM 7. BOOST MD turns BOOST MODE OFF or ON. BOOST Previous MODE is on by default. SET MAX CURRENT: OFF Menu Outdoor VERTICAL RISE: Help Lower BOOST MD: ON BOOST TEMP: Always On Cancel Help Done 8. BOOST TEMP adjusts the activation temperature from 70°...
  • Page 92 CKT04 ADDENDUM 9. Once satisfied with BOOST MODE adjustments, navigate to the HOME screen by selecting the Previous Menu button three times then selecting HOME. 7. Once open select Dehumidification Equipment: None. Dehumidification 8. From the Dehumidification Menu select A/C with Low Speed Fan and click the green Done button.
  • Page 93 CKT04 ADDENDUM Dehumidification Select* When Dehumidification mode exists, the circulating fan output is reduced, increasing system run time, over cooling the evaporator coil and ultimately removing more humidity from the structure than if only in cooling mode. The system can have Dehumidification operation in setting “STD”, “A”, “B”...
  • Page 94 CKT04 ADDENDUM Set Thermostat to Adjust Maximum Compressor Speed Please follow the following sequence to enter MAXIMUM compressor speed. Maximum compressor speed at which the outdoor unit will operate can be changed using thermostat. Maximum compressor speed can be changed to get the required capacity or efficiency.
  • Page 95 CKT04 ADDENDUM 4. Select YES to continue. 5. Select AIR CONDITIONER. 6. Select CL RUN VALUES. 7. Select COOL RPS RANGE. Press COOL RPS RANGE to select the range in which the desired Maximum compressor speed falls.
  • Page 96 CKT04 ADDENDUM 8. Select COOL RPS SELECT. Select the desired Maximum compressor speed 9. Once Maximum compressor speed is set, navigate to HOME screen. Enter normal operation with temperature offset or thermostat schedule, as desired. Set Thermostat to Adjust Indoor Air CFM Trim 1.
  • Page 97 CKT04 ADDENDUM 3. Enter Installer password. (The password is the Date Code located on the thermostat and is available by entering the EQUIPMENT STATUS menu and scrolling to the bottom). 4. Select YES to continue. 5. Select AIR CONDITIONER. 6. Select COOL SET-UP.
  • Page 98 CKT04 ADDENDUM 7. User can change the airflow trim at high, intermediate and low compressor for cooling and heating mode. Select: Cool Airflow Trim Hi: high speed cooling Cool Airflow Trim Int: intermediate speed cooling Cool Airflow Trim Low: low speed cooling Under each trim setting, the airflow can be increased or decreased by a certain percentage.
  • Page 99 CKT04 ADDENDUM Set Thermostat to Adjust Indoor Airflow Profile, Cool On Delay and Cool Off Delay 1. Please follow the sequence 1 to 6 of SET THERMOSTAT TO ADJUST INDOOR AIR CFM TRIM. 2. Select COOL AIRFLOW PROFILE, COOL ON DELAY or COOL OFF DELAY.
  • Page 100 CKT04 ADDENDUM Set Thermostat to PUMP DOWN Please follow the following sequence to enter PUMP DOWN to accumulate the refrigerant to outdoor unit. Do not operate COOL ON mode to enter PUMP DOWN. Before starting the PUMP DOWN operation, change indoor fan trim, delay and profile back to default and stop electric heater and gas furnace.
  • Page 101 CKT04 ADDENDUM 4. Select YES to continue. 5. Select AIR CONDITIONER. 6. Select MAINTENANCE. Select PUMP DOWN.
  • Page 102 CKT04 ADDENDUM 8. Select ON. Press DONE to initiate PUMP DOWN. Approximately one minute later, the compressor should start operating. Check the amperage at the compressor wiring to see the compressor operation status. Close liquid service valve approximately two minutes after compressor has come on. Compressor will stop automatically then close the gas service valve immediately.
  • Page 103 CKT04 ADDENDUM Set 7-Segment Mode Display to Pump Down 2. Approximately one minute later, the compressor should start operating. Check the amperage at the compressor wiring to see the compressor operation status. Unit Please follow the following sequence to enter PUMP DOWN displays error code E11 (System Verification Test) once to accumulate the refrigerant to outdoor unit.
  • Page 104 CKT04 ADDENDUM Directions to ComfortNet System Advanced Feature Menus Press MENU, scroll down and press COMFORTNET USER MENU. Enter the date code (password) when prompted. The date code is printed on the back of the thermostat; or press MENU>EQUIPMENT STATUS and scroll down to find the date code.
  • Page 105 CKT04 ADDENDUM Set-Up SET-UP i f i Choose the opera�on mode of Humidifier OFF*, ON, IND (This selec�on is only displayed if HUM is selected in ACC) Choose the indoor fan speed at the �me of humidifica�on HUM FAN SPD (%) 25%, 50%*, 75% , 100% (This selec�on is only displayed if IND is selected in HUM and HUM is selected in ACC)
  • Page 106 CKT04 ADDENDUM ONDITIONER DVANCED EATURE DIAGNOSTICS INDICATION/USER SUBMENU ITEM COMMENTS MODIFIABLE OPTIONS s t l Y " " t s i t l u t l u t l u t l u t l u t l u t l u t l u t l u t l u...
  • Page 107 CKT04 ADDENDUM ONDITIONER DVANCED EATURE SYSTEM MAINTENANCE Enter PUMP DOWN Mode. This procedure runs the equipment for approximately 15 minutes and allows accumulation of refrigerant at the outdoor unit for purposes of removing & replacing the indoor unit or outdoor unit. Enter Charging Mode.

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