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Daikin DX17VSS421AA - User Manual

Daikin DX17VSS421AA
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INSTALLATION INSTRUCTIONS
AIR CONDITIONER
DX17VSS AIR CONDITIONING
INSTALLATION & SERVICE REFERENCE
Index
Important Safety InStructIonS ............................................. 1
ShIppIng InSpectIon .............................................................. 1
codeS & regulatIonS .......................................................... 2
featureS.............................................................................. 2
Before InStallatIon .............................................................2
precautIonS for SelectIng a locatIon ................................. 2
precautIonS for InStallatIon ............................................... 3
InStallatIon clearanceS ......................................................3
rooftop InStallatIonS .........................................................3
electrIcal noISe ................................................................. 4
Safety conSIderatIonS......................................................... 4
refrIgerant lIneS ............................................................... 6
refrIgerant lIne connectIonS ............................................. 8
leak teStIng (nItrogen or nItrogen-traced) ...................... 8
SyStem Start-up procedure ................................................ 9
Start-up procedure detaIl .................................................. 9
electrIcal connectIonS ......................................................9
calculate refrIgerant charge BaSed on lIne Set length
... 12
connect aIr condItIoner to SyStem .................................. 13
SyStem Start-up teSt (In caSe of ctk04) ........................ 14
Set thermoStat to charge mode (In caSe of ctk04)
... 17
adjuSt refrIgerant level .................................................20
meaSure SuBcoolIng to verIfy proper charge ................. 20
fIeld SelectaBle BooSt mode (In caSe of ctk04) ........... 21
dehumIdIfIcatIon (In caSe of ctk04) ................................. 24
nIght mode (In caSe of ctk04) ........................................ 25
comfortnet™ SyStem .......................................................28
aIr condItIoner advanced feature menu ........................... 30
WIrIng dIagram ................................................................ 33
teStIng capacItor reSIStance ............................................34
coolIng analySIS chart .................................................... 35
trouBleShootIng ...............................................................36
SettIng the mode dISplay .................................................. 41
7-Segment dISplay ............................................................. 47
aIr condItIonIng homeoWnerS routIne maIntenance
recommendatIonS ........................................................ 49
Start up checklISt ........................................................... 50
Important Safety InStructIonS
The following symbols and labels are used throughout this
manual to indicate immediate or potential safety hazards. It is
the owner’s and installer’s responsibility to read and comply
with all safety information and instructions accompanying
these symbols. Failure to heed safety information increases
the risk of personal injury, property damage, and/or product
damage.
WARNING
HIGH VOLTAGE !
dISconnect all poWer Before ServIcIng.
multIple poWer SourceS may Be preSent. faIlure
to do So may cauSe property damage, perSonal
Injury or death.
WARNING
only perSonnel that have Been traIned to InStall, adjuSt, Ser-
vIce or repaIr (hereInafter, “ServIce”) the equIpment SpecIfIed
In thIS manual Should ServIce the equIpment. the manufacturer
WIll not Be reSponSIBle for any Injury or property damage arIS-
Ing from Improper ServIce or ServIce procedureS. If you ServIce
thIS unIt, you aSSume reSponSIBIlIty for any Injury or property
damage WhIch may reSult. In addItIon, In jurISdIctIonS that re-
quIre one or more lIcenSeS to ServIce the equIpment SpecIfIed In
thIS manual, only lIcenSed perSonnel Should ServIce the equIp-
ment. Improper InStallatIon, adjuStment, ServIcIng or repaIr of
the equIpment 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.
CAUTION
do not WaSh the aIr condItIoner WIth exceSSIve Water. an elec-
trIc Shock or fIre could reSult.
ShIppIng InSpectIon
Always keep the unit upright; laying the unit on its side or top
may cause equipment damage. Shipping damage, and sub-
sequent investigation is the responsibility of the carrier. Verify
the model number, specications, electrical characteristics,
and accessories are correct prior to installation. The distributor
or manufacturer will not accept claims from dealers for trans-
portation damage or installation of incorrectly shipped units.
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Questions and Answers

  • J
    Joseph RodriguezAug 19, 2025
    What to do if my Daikin DX17VSS421AA shows HI PRESSURE C error?
    • M
      Mark LoganAug 19, 2025
      If your Daikin Air Conditioner displays 'HI PRESSURE C' (Critical), it could be due to several reasons: a blocked or restricted condenser coil, a stop valve not fully open, an overcharge of refrigerant, the outdoor fan not running, an inoperable high-pressure switch (HPS), or a faulty indoor EEV coil. You should check and clean the condenser coil and lines, ensure the stop valve is fully open, verify the refrigerant charge level, inspect the outdoor fan motor and wiring, and check the indoor EEV and its coil. If none of these steps resolve the issue, consider replacing the control board.
  • M
    Martin MillerAug 21, 2025
    What to do if my Daikin DX17VSS421AA Air Conditioner shows LOW PRESSURE C error?
    • D
      Destiny RobbinsAug 21, 2025
      If your Daikin Air Conditioner displays 'LOW PRESSURE C', it could be due to a stop valve not being completely open, a restriction in the refrigerant lines, a low refrigerant charge, a refrigerant leak, an inoperable or improperly connected low-pressure sensor, an indoor fan motor not functioning correctly, or a faulty indoor EEV, EEV coil or control board. Check the opening of the stop valve, look for restrictions in the refrigerant line, check the refrigerant charge level, test for system leaks, check the connection to the low-pressure sensor, and inspect the indoor EEV, EEV coil and control board. Replace components as needed.
  • C
    Casey PorterAug 23, 2025
    What to do if my Daikin Air Conditioner shows HI PRESSURE M error?
    • R
      Robert MartinezAug 23, 2025
      If your Daikin Air Conditioner displays 'HI PRESSURE M' (Minor), it might be caused by a blocked or restricted condenser coil, a stop valve that isn't fully open, an overcharge of refrigerant, a non-running outdoor fan, an inoperable high pressure switch (HPS), or a faulty indoor EEV coil. To solve this, check and clean the condenser coil and lines, make sure the stop valve is fully open, verify the refrigerant charge level, inspect the outdoor fan motor and wiring, and check the indoor EEV and its coil. If the problem persists, consider replacing the control board.
  • K
    kyle54Aug 26, 2025
    What to do if my Daikin Air Conditioner shows LOW PRESSURE M error?
    • M
      Melinda WadeAug 26, 2025
      If your Daikin Air Conditioner displays 'LOW PRESSURE M', it could be due to a stop valve not being completely open, a restriction in the refrigerant lines, a low refrigerant charge, a refrigerant leak, an inoperable or improperly connected low-pressure sensor, an indoor fan motor not functioning correctly, or a faulty indoor EEV, EEV coil or control board. Check the opening of the stop valve, look for restrictions in the refrigerant line, check the refrigerant charge level, test for system leaks, check the connection to the low-pressure sensor, and inspect the indoor EEV, EEV coil and control board. Replace components as needed.
  • V
    Vincent WoodsAug 28, 2025
    What to do if my Daikin DX17VSS421AA Air Conditioner shows COMPRESSOR FAIL error?
    • M
      Mr. Jeffery RiveraAug 28, 2025
      If your Daikin Air Conditioner shows a 'COMPRESSOR FAIL' error, it could be due to a stop valve not being completely open, a lost phase in the compressor wire, or compressor motor failure. You should check that the stop valve is fully open, inspect the wire between the control board and the compressor, and inspect the compressor motor for proper function. Replace components as necessary.
  • A
    afryAug 30, 2025
    What does PCB OR FAN FAIL mean on my Daikin DX17VSS421AA Air Conditioner?
    • L
      Laura HornAug 30, 2025
      If your Daikin Air Conditioner displays 'PCB OR FAN FAIL', it could be due to an obstruction in fan rotation, the outdoor fan motor not being connected properly, the outdoor fan not running, a faulty control board, or electrical noise. Check and clean the grille of any debris, check the wiring from the outdoor fan motor to the control board, and check the outdoor fan motor and wiring. If necessary, replace the control board.
  • E
    ejohnsonSep 1, 2025
    What to do if my Daikin DX17VSS421AA shows OD CTRL FAIL2 error?
    • R
      Ryan SandersSep 1, 2025
      If your Daikin Air Conditioner displays 'OD CTRL FAIL2', it could be caused by the outdoor fan motor not being connected properly, a faulty control board or electrical noise. Check the wiring from the outdoor fan motor to the control board and repair if needed. If necessary, replace the control board.
  • C
    Carlos BrooksSep 4, 2025
    What does ACE TEMP FAIL mean on my Daikin DX17VSS421AA Air Conditioner?
    • J
      Jessica GreenSep 4, 2025
      If your Daikin Air Conditioner displays 'ACE TEMP FAIL', it may be due to high or low voltage from the supply, a faulty control board, or noise. Correct any low/high line voltage conditions, contacting your local utility if needed. If that doesn't solve the issue, replace the control board.
  • S
    Stephanie BakerSep 6, 2025
    What to do if my Daikin DX17VSS421AA shows HIGH DISCH TEMP error?
    • J
      Juan ParsonsSep 6, 2025
      If your Daikin Air Conditioner displays 'HIGH DISCH TEMP', this may be caused by a discharge thermistor that is inoperable or improperly connected. Check the discharge thermistor resistance and connections, and repair or replace as needed.
  • W
    whitelindaSep 8, 2025
    What to do if my Daikin DX17VSS421AA Air Conditioner shows LOW DISCH TEMP error?
    • K
      Kristy MullinsSep 8, 2025
      If your Daikin Air Conditioner displays 'LOW DISCH TEMP', this may be caused by a discharge thermistor that is inoperable or improperly connected. Check the discharge thermistor resistance and connections, and repair or replace as needed.

Summary

IMPORTANT SAFETY INSTRUCTIONS

HIGH VOLTAGE WARNING

Warning about high voltage and disconnecting power before servicing.

QUALIFIED PERSONNEL WARNING

Warning about qualified personnel for installation and service.

PRE-INSTALLATION PRECAUTIONS

LOCATION SELECTION GUIDELINES

Guidelines for choosing an appropriate installation location for the unit.

INSTALLATION PRECAUTIONS AND CLEARANCES

ELECTRICAL NOISE AND SAFETY CONSIDERATIONS

REFRIGERANT HANDLING AND INSTALLATION SAFETY

REFRIGERANT CYLINDER HAZARDS AND PRECAUTIONS

Warning about potential explosion risks related to refrigerant cylinders.

GENERAL INSTALLATION SAFETY WARNINGS

Warnings about proper grounding, disposal, and installation practices.

REFRIGERANT LINE CONNECTIONS AND LEAK TESTING

LEAK TESTING PROCEDURES AND WARNINGS

Procedure for leak testing and warnings about fire/explosion and nitrogen cylinder safety.

SYSTEM START-UP PROCEDURE AND ELECTRICAL CONNECTIONS

DETAILED START-UP AND ELECTRICAL PROCEDURES

Steps for vacuum, leak testing, electrical connections, grounding, and copper conductors.

ELECTRICAL WIRING AND PROTECTION

LOW VOLTAGE AND COMMUNICATION WIRING

INSTALLER IMPORTANT NOTICES AND COMMUNICATION WIRING

Critical notices for installers and guidelines for communication wiring.

REFRIGERANT CHARGE CALCULATION

REFRIGERANT CHARGE TABLE (LINE SET LENGTH)

Table for calculating total and additional refrigerant based on line set length.

AIR CONDITIONER CONNECTION AND CHARGE ADJUSTMENT

SYSTEM START-UP TEST PROCEDURE (CTK04)

SYSTEM START-UP TEST NAVIGATION AND SETTINGS

EQUIPMENT TEST EXECUTION AND SYSTEM TEST

EQUIP TEST MENU ACCESS AND SYSTEM TEST ACTIVATION

Navigation to Equip Test and procedure to activate System Test.

SETTING THERMOSTAT TO CHARGE MODE (CTK04)

THERMOSTAT CHARGE MODE SETUP

TERMINATING CHARGE MODE

CHARGE MODE TERMINATION PROCEDURE

Procedure to set CHARGE MODE to OFF to terminate it.

REFRIGERANT LEVEL ADJUSTMENT AND SUBCOOLING

REFRIGERANT HANDLING NOTICES AND SUBCOOLING MEASUREMENT

Notices for refrigerant handling and procedure for subcooling measurement.

REFRIGERANT CHARGE ADJUSTMENT TABLES

Tables for liquid pressure-temperature and refrigerant charge adjustment.

FIELD SELECTABLE BOOST MODE (CTK04)

BOOST MODE CONFIGURATION

BOOST MODE SETTINGS ADJUSTMENT

DEHUMIDIFICATION SETTINGS (CTK04)

NIGHT MODE SETTINGS (CTK04)

NIGHT MODE CONFIGURATION

NIGHT MODE SETTINGS ADJUSTMENT

COMFORTNET SYSTEM OVERVIEW AND MENUS

DIAGNOSTICS AND STATUS MONITORING MENUS

Accessing diagnostics and system status monitoring menus.

COMFORTNET SYSTEM ADVANCED MENUS DETAILS

SYSTEM SETUP, EQUIPMENT TEST, AND COOL SET-UP OPTIONS

Details on system setup, equipment test, and cool set-up options.

AIRFLOW PROFILES AND COOLING RUN VALUES

Information on airflow profiles and cooling run values adjustment.

AIR CONDITIONER ADVANCED FEATURE MENU DETAILS

DIAGNOSTICS AND STATUS SUBMENU ITEMS

Detailed breakdown of diagnostics and status monitoring submenu items.

SYSTEM SETUP CONFIGURATIONS (SYS SETUP1;2)

EQUIPMENT TEST PROCEDURE

SYSTEM VERIFICATION TEST EXECUTION

Procedure to run the system verification test after installation.

COOL SETUP AND COOLING RUN VALUES CONFIGURATION

MAXIMUM COMPRESSOR RPS SETTINGS

Settings for maximum compressor RPS range and selection.

WIRING DIAGRAM AND CONNECTIONS

HIGH VOLTAGE WIRING WARNING AND NOTES

Warning about high voltage and notes on wiring diagrams and conductor types.

CAPACITOR RESISTANCE TESTING PROCEDURES

CAPACITOR TESTING SAFETY WARNING

Warning about avoiding contact with charged areas and residual voltage during testing.

COOLING ANALYSIS CHART AND POSSIBLE CAUSES

TROUBLESHOOTING GUIDE (FAULT CODES E12-E25)

TROUBLESHOOTING GUIDE (FAULT CODES E26-E45)

TROUBLESHOOTING GUIDE (FAULT CODES E47-ED4)

TROUBLESHOOTING GUIDE (SYSTEM TEST E11)

SYSTEM TEST EXECUTION TROUBLESHOOTING

Troubleshooting steps for the system run test.

NETWORK TROUBLESHOOTING AND DIAGNOSTICS

NETWORK COMMUNICATION ISSUES AND DIPSWITCH SETTINGS

Troubleshooting network communication issues and dipswitch settings.

MODE DISPLAY OPERATION AND MODES

NAVIGATING THE MODE DISPLAY SCREENS

SCREEN NAVIGATION PROCEDURES (0-4)

Instructions for navigating between different display screens (0-4).

FAULT CODE HISTORY NAVIGATION

MONITORING MODE NAVIGATION

SETTINGS MODE 1 NAVIGATION

SETTINGS MODE 2 NAVIGATION

7-SEGMENT DISPLAY MODES AND SCREENS

7-SEGMENT DISPLAY SETTINGS SCREENS

UNITARY INVERTER START-UP CHECKLIST

UNITARY INVERTER START-UP DATA ENTRY

Daikin DX17VSS421AA Specifications

General IconGeneral
Energy Efficiency Ratio (EER)Up to 12.5
Heating Season Performance Factor (HSPF)Up to 9.5
Refrigerant TypeR-410A
Operating Voltage208/230V
Phase1
Seasonal Energy Efficiency Ratio (SEER)17.0

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