Daikin DX17VSS421AA User Manual

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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 homeoWner’S 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:

M
Marc LaneSep 12, 2025
What does OD CTRL FAIL1 mean on my Daikin DX17VSS421AA?
- M
  Mr. Michael RomanSep 12, 2025
  If your Daikin Air Conditioner displays 'OD CTRL FAIL1', it may be due to high electrical noise. If necessary, replace the control board.
N
nelsonnicholasSep 13, 2025
What does HPS OPEN mean on my Daikin DX17VSS421AA Air Conditioner?
- R
  Rachel SosaSep 13, 2025
  If your Daikin Air Conditioner displays 'HPS OPEN', the high-pressure switch (HPS) might be inoperable. Check the resistance on the HPS to verify its operation and replace it if needed.
S
Sarah JonesSep 15, 2025
What to do if my Daikin DX17VSS421AA shows NO COOLING TEST?
- L
  Lisa SmithSep 15, 2025
  If your Daikin Air Conditioner is showing 'NO COOLING TEST', it means that heat is being provided by a secondary heating source. Turn off any furnace or heater using the thermostat before operating the air conditioner.

Daikin DX17VSS421AA Specifications

General

Energy Efficiency Ratio (EER)	Up to 12.5
Heating Season Performance Factor (HSPF)	Up to 9.5
Refrigerant Type	R-410A
Operating Voltage	208/230V
Phase	1
Seasonal Energy Efficiency Ratio (SEER)	17.0