Daikin DZ11TA Series User manual

IMPORTANT SAFETY INSTRUCTIONS
Thefollowingsymbolsandlabelsareusedthroughoutthismanual
toindicateimmediateorpotentialsafetyhazards. Itistheowner’s
and installer’s responsibility to read and comply with all safety
information and instructions accompanying these symbols. Fail-
ure to heed safety information increases the risk of personal in-
jury, property damage, and/or product damage.
HIGH VOLTAGE!
Disconnect ALL power before servicing. Multiple
powersources may bepresent. Failure to do so may
cause property damage, personal injury or death.
Only personnel that have been trained to install, adjust, service 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 arising 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 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 equipment
specified in this manual, or attempting to install, adjust, service or
repairthe equipment specified in this manual without proper
training may result in product damage, property damage, personal
injury or death.
Scroll equipped units should never be used to evacuate theair
conditioning system.Vacuums this low can cause internal
electrical arcing resultingin a damaged orfailed compressor.
CAUTION
DZ11TA SERIES
CONDENSING UNIT
HEAT PUMP
INSTALLATION & SERVICE REFERENCE
SHIPPING INSPECTION
Alwayskeeptheunitupright;layingtheunitonitssideortopmay
cause equipment damage. Shipping damage, and subsequent in-
vestigation is the responsibility of the carrier. Verify the model
number, specifications, electrical characteristics, and accessories
are correct prior to installation. The distributor or manufacturer
will not accept claims from dealers for transportation damage or
installation of incorrectly shipped units.
CODES & REGULATIONS
This product is designed and manufactured to comply with na-
tional codes. Installation in accordance with such codes and/or
prevailing local codes/regulations is the responsibility of the in-
staller. The manufacturer assumes no responsibility for equip-
mentinstalled inviolationofanycodesorregulations. Ratedper-
formance is achieved after 20 hours of operation. Rated perfor-
manceisdeliveredatthespecifiedairflow.Seeoutdoorunitspeci-
ficationsheetforsplitsystemmodelsorproductspecificationsheet
for packaged and light commercial models. Specification sheets
can be found at www.daikinac.com for Daikin brand products.
Within the website, please select the residential or commercial
productsmenu andthen selectthe submenufor thetypeofprod-
uct to be installed, such as air conditioners or heat pumps, to ac-
cessalist ofproductpagesthat eachcontainlinks to thatmodel’s
specification sheet.
The United States Environmental Protection Agency (EPA) has
issued various regulations regarding the introduction and dis-
posalofrefrigerants.Failuretofollowtheseregulationsmayharm
the environment and can lead to the imposition of substantial
fines. Should you have any questions please contact the local of-
fice of the EPA.
If replacing a condensing unit or air handler, the system must be
manufacturer approved and Air Conditioning and Refrigeration
Institute (AHRI) matched. NOTE: Installation of unmatched sys-
tems is strongly discouraged.
Outdoor units are approved for operation above 55°F in cooling
mode. Operation below 55°F in cooling mode requires the use of
an approved low ambient kit.
Damage to the unit caused by operating the unit in a structure
that is not complete (either as part of new construction or reno-
vation) is not covered under the warranty.
RefertotheunitSpecificationSheetfortherecommendedindoor
model selection. NOTE: This unit must be used with a purchased
two stage room thermostat with 24 VAC control circuitry.
INSTALLATION INSTRUCTIONS
Our continuing commitment to quality products may mean a change in specifications without notice.
©2018 5151 San Felipe St., Suite 500, Houston, TX 77056
www.daikinac.com
IOD-4032
4/2018

2
INSTALLATION CLEARANCES
Thisunit is designed for outdoor installations only. Special consid-
eration must be given to location of the condensing unit(s) in re-
gardtostructures,obstructions,otherunits,andany/allotherfac-
tors that may interfere with air circulation. Where possible, the
top of the unit should be completely unobstructed; however, if
verticalconditionsrequireplacementbeneathanobstructionthere
should be a minimum of 60 inches between the top of the unit
and the obstruction(s). The specified dimensions meet require-
ments for air circulation only. Consult all appropriate regulatory
codes prior to determining final clearances.
Another important consideration in selecting a location for the
unit(s)istheangleto obstructions. Eithersideadjacent thevalves
can be placed toward the structure provided the side away from
the structure maintains minimum service clearance. Corner in-
stallations are strongly discouraged.
12"
12"12"
60"
24"
This unit can be located at ground floor level or on flat roofs. At
ground floor level, the unit must be on a solid, level foundation
thatwillnotshiftorsettle.Toreducethepossibilityofsoundtrans-
mission, the foundation slab should not be in contact with or be
an integral part of the building foundation. The foundation slab
should be a minimum of 6” wider than the unit in all directions.
Ensure the foundation is sufficient to support the unit. A concrete
slab raised above ground level provides a suitable base.
Theselectedsiteshouldbenogreaterthan50’belowor70’above
the evaporator section. For optimum performance, the minimum
length interconnecting tubing is preferred. When possible mini-
mize the amount of bends and turns.
ROOFTOP INSTALLATIONS
If it is necessary to install this unit on a roof structure, ensure the
roof structure can support the weight and that proper consider-
ation is given to the weather-tight integrity of the roof. Since the
unit can vibrate during operation, sound vibration transmission
should be considered when installing the unit. Vibration absorb-
ing pads or springs can be installed between the condensing unit
legs or frame and the roof mounting assembly to reduce noise
vibration.
NOTE: Theseunitsrequirespeciallocationconsiderationin areas
of heavy snow accumulation and/or areas with prolonged
continuoussubfreezingtemperatures.Heatpumpunitbaseshave
cutouts under the outdoor coil that permit drainage of frost
accumulation. Situate the unit to permit free unobstructed
drainage of the defrost water and ice. A minimum 3" clearance
under the outdoor coil is required in the milder climates.
In more severe weather locations, it is recommended that the
unit be elevated to allow unobstructed drainage and air flow.
RIGGING
To avoid possible injury or death, all panels must be in position
and secured before lifting this equipment.
Usefield-suppliedspreaderbarswhenliftingtheunittominimize
thepossibilityof liftingcable/strapsdamage. Toprotectthecabi-
net louvers, use protective material such as plywood behind the
cable/straps. Arrange the straps to form a central suspension
point.NOTE:When raisingandsettingtheunit, observeallsafety
rules.Removeshippingskidandallprotectionandliftingmaterial
after the unit is in place.
SAFE REFRIGERANT HANDLING
While these items will not cover every conceivable situation,
they should serve as a useful guide.
To avoid possible injury, explosion or death, practice safe
handling of refrigerants.

3
To avoid possible explosion:
Never apply flame or steam to a refrigerant cylinder. If you
must heat a cylinder for faster charging, partially immerse
it in warm water.
Never fill a cylinder more than 80% fullof liquid refrigerant.
• Never add anything other than R-410A to an R-410A
cylinder. The service equipment used mustbe listed or
certified for the type of refrigerant used.
• Store cylinders in a cool, dryplace. Never use a cylinder
as a platform or a roller.
•
•
To avoid possible explosion, use only returnable (not disposable)
service cylinders when removing refrigerant from a system.
• Ensure the cylinder is free of damage which could lead to a
leak or explosion.
• Ensure the hydrostatic test date does not exceed 5 years.
• Ensure the pressure rating meets or exceeds 400 PSIG.
When in doubt, do not usecylinder.
REFRIGERANT LINES
The compressor POE oil for R-410A units is extremely susceptible
to moisture absorption and could cause compressor failure. Do
not leave system open to atmosphere any longer than necessary
for installation.
CAUTION
NOTE: For improved refrigerant management, equip the
evaporatorcoilwithafield-suppliedthermalexpansionvalve(TXV)
andtheliquidlinewithafield-suppliedliquidlinesolenoid.Ensure
thesolenoidisinstalled as close aspossibletotheevaporator coil
topreventrefrigerationmigrationinthecompressor“OFF” cycle.
Useonlyrefrigerantgrade(dehydratedandsealed)coppertubing
toconnectthe condensingunitwith theindoorevaporator. After
cutting the tubing, install plugs to keep refrigerant tubing clean
and dry prior to and during installation. Tubing should always be
cut square keeping ends round and free from burrs. Clean the
tubing to prevent contamination.
DoNOTletrefrigerantlinescomeindirectcontactwithplumbing,
ductwork,floorjoists,wallstuds,floors,andwalls. Whenrunning
refrigerant lines through a foundation or wall, openings should
allow for sound and vibration absorbing material to be placed or
installedbetweentubingandfoundation. Any gap between foun-
dation or wall and refrigerant lines should be filled with a pliable
silicon-based caulk, RTV or a vibration damping material. Avoid
suspendingrefrigeranttubingfromjoistsandstudswithrigidwire
orstrapsthatwouldcomeincontactwiththetubing.Useaninsu-
lated or suspension type hanger. Keep both lines separate and
always insulate the suction line.
Suct Liq Suct Liq Suct Liq
7 1/2 1 1/8 5/8 1 3/8 5/8 1 3/8 5/8
10 1 3/8 5/8 1 5/8 5/8 1 5/8 5/8
Cond Unit
(Tons)
REFRIGERANTLINELENGTH (ft)
0-24 25-49* 50-74**
Line Diameter (In.OD)
* Full rating line size
** Lines greater than 74 feet in length or vertical elevation changes more
than 50 feet refer to TP-108*Long Line Set Application Guideline or
contact your distributor for assistance.
REFRIGERANT LINES
Insulationisnecessarytopreventcondensationfromformingand
dropping from the suction line. Armflex®(or satisfactory equiva-
lent) with 3/8” min. wall thickness is recommended. In severe
conditions (hot, high humidity areas) 1/2” insulation may be re-
quired. Insulation must be installed in a manner which protects
tubing from damage and contamination.
Wherepossible,drainasmuchresidualcompressoroilfromexist-
ingsystems,lines,andtraps;paycloseattentiontolowareaswhere
oil may collect.

4
NOTE: If changing refrigerant types, ensure the indoor coil and
metering device is compatible with the type of refrigerant being
used;otherwise,the indoor coilmustbereplaced. To facilitateoil
return to the compressor, a horizontal suction line should be
pitched (1/2” per 10’ toward the condensing unit.
Filter Drier and Sight Glass
A liquid line filter drier is factory installed. Field-install the sup-
plied sight glass/moisture indicator on the liquid line as close as
practical to the service valve.
BURYING REFRIGERANT LINES
If burying refrigerant lines can not be avoided, use the following
checklist.
1. Insulate liquid and suction lines separately.
2. Enclose all underground portions of the refrigerant lines in
waterproofmaterial(conduitorpipe)sealingtheendswhere
tubing enters/exits the enclosure.
3. If the lines must pass under or through a concrete slab, en-
sure lines are adequately protected and sealed.
REFRIGERANT LINE CONNECTIONS
IMPORTANT:Toavoidoverheatingtheservicevalve,TXVvalve,
or filter drier while brazing, wrap the component with a wet
rag, or use a thermal heat trap compound as recommended by
the compound manufacturer. Use a brazing alloy of 2% mini-
mum silver content. Do not use flux.
1. The ends of the refrigerant lines must be cut square, de-
burred,cleaned,andberoundandfreefromnicksordents.
Any other condition increases the chance of a refrigerant
leak.
2. This unit is factory shipped with a holding charge. “Sweep”
therefrigerantlinewithnitrogenorinertgasduringbrazing
to prevent the formation of copper-oxide inside the refrig-
erant lines.
3. Afterbrazing,quenchthe joints withwaterorawet cloth to
prevent overheating of the service valve.
4. Ensure the filter drier paint finish is intact after brazing. If
thepaintofthesteelfilterdrierhasbeenburnedorchipped,
repaint or treat with a rust preventative. This is especially
important on suction line filter driers which are continually
wet when the unit is operating.
NOTE: Be careful not to kink or dent refrigerant lines. Kinked or
dentedlines willcause poorperformance orcompressordamage.
Do NOT make final refrigerant line connection until plugs are
removed from refrigerant tubing.
NOTE: Before brazing, verify indoor piston size by checking the
piston kit chart packaged with indoor unit.
LEAK TESTING
(NITROGEN OR NITROGEN-TRACED)
To avoid the risk of fire or explosion, never use oxygen, high
pressure air orflammable gases forleak testing of a refrigeration
system.
Pressure test the system using dry nitrogen and soapy water to
locateleaks. Ifyouwishto usealeak detector,chargethesystem
to 10 psi using the appropriate refrigerant then use nitrogen to
finishchargingthesystem to working pressurethenapplythede-
tector to suspect areas. If leaks are found, repair them. After re-
pair, repeat the pressure test. If no leaks exist, proceed to system
evacuation.
SYSTEM EVACUATION
Condensing unit liquid and suction valves are closed to contain
thechargewithintheunit. Theunitisshippedwiththevalvestems
closed and caps installed. Do not open valves until the system is
evacuated.
1. Connectthevacuumpumpwith250microncapabilitytothe
service valves.
2. Evacuate the system to 250 microns or less using suction
and liquid service valves. Using both valves is necessary as
some compressors create a mechanical seal separating the
sides of the system.
3. Close pump valve and hold vacuum for 10 minutes. Typi-
cally pressure will rise during this period.
•If the pressure rises to 1000 microns or less and remains
steadythesystemisconsideredleak-free;proceedtostartup.
• Ifpressurerisesabove1000micronsbutholdssteadybelow
2000 microns, moisture and/or noncondensibles may be
presentor thesystemmayhavea smallleak. Returntostep
2:Ifthesameresultisencounteredcheckforleaksasprevi-
ouslyindicatedandrepairasnecessarythen repeat evacua-
tion.
•Ifpressurerisesabove2000microns,aleakispresent. Check
forleaksaspreviouslyindicatedandrepairasnecessarythen
repeat evacuation.

5
5000
4500
4000
3500
3000
2500
2000
1500
1000
500
0 1 2 3 4 5 6 7 8 9 10
LEAK(S)
PRESENT
MINUTES
VACUUM IN MICRONS
CONDENSIBLES OR SMALL
LEAK PRESENT
NO LEAKS
NO CONDENSIBLES
Refer to the Remote Condensing Unit Service Manual for more
detailed instructions on system evacuation, preliminary charge
adjustment, and final charge adjustment.
ELECTRICAL CONNECTIONS
HIGH VOLTAGE!
Disconnect ALL power before servicing.
Multiple power sources may be present. Failure todo
so may cause property damage, personal injury or
death due to electric shock. Wiring must conform with
NEC or CEC and all local codes. Undersized wires could cause
poor equipment performance, equipment damage or fire.
To avoid the riskof fire or equipment damage, use copper
conductors.
NOTICE
Units with reciprocating compressors and non-bleed TXV’s
require a Hard Start Kit.
Thisunitis designedforthree phaseoperation.DONOT OPERATE
ON A SINGLE PHASE POWER SUPPLY. Measure the power supply
to the unit. The supply voltage must be in agreement with the
unit rating plate power requirements and within the range listed
below:
RATED
VOLTAGE MINIMUMSUPPLY VOLTAGE MAXIMUM SUPPLY VOLTAGE
208/230V 197 253
460V 414 506
Thecondensingunitratingplatelistspertinentelectricaldatanec-
essary for proper electrical service and overcurrent protection.
Wires should be sized to limit voltage drop to 2% (max.) from the
main breaker or fuse panel to the condensing unit. Consult the
NEC,CEC,andalllocalcodestodeterminethecorrectwiregauge
andlength. ThewiresizemustbesufficienttocarrytheMinimum
Circuit Ampacity (MCA) listed on the serial plate.
The supply voltage can be unbalanced (phase to phase) within
2%. Thefollowing formulacanbeusedtodeterminethepercent-
age of voltage unbalance for your unit.
Percentage
Voltage
Unbalance
= 100 x Max. Voltage Deviation From
Average Voltage
Average Voltage
Example:
L1-L2 = 220V
L2-L3 = 216V
Average Voltage = (220 + 216 + 213)/3
=649/3
Maximum Deviation from Average = 220 - 216 = 4
% Voltage Unbalance = 100 x (4/216)
=400/216
10 15 20 25 30 35 40 45
14 75 50 37 NR NR NR NR NR
12 118795947NRNRNRNR
10 188 125 95 75 63 54 NR NR
8 301 201 150 120 100 86 75 68
6 471 314 235 188 157 134 118 110
*Based on NEC 1996
MAXIMUM ALLOWABLE LENGTH IN FEET
TO LIMIT VOLTAGE DROP TO 2%
Minimum Circuit Ampacity (MCA)
Wire Size
(AWG)
Example:
A
7½ Ton unit is to be installed. The distance from the
building to the unit is 75’. Calculate the minimum wire size
assuming no more than 2% voltage drop.
MCA for 7 Ton 230V unit = 43.3 (from S&R plate).
Applying previous table wire sizes less than #8 AWG cannot
be used for circuits which have a rating of 45A. The #8 wire
is not suitable since the maximum length for a 45A circuit
is 68’.
Solution: Use a #6 AWG wire suitable up to 110’.
NOTE: It is the contractors’s responsibility to follow the NEC
(USA) orCEC(Canada) when sizing the service wire for this
unit.
½
*Always refer to the unit’s S&R plate for actual ratings.
Local codes often require a disconnect switch located near the
unit;do notinstall theswitch onthe unit. Referto theinstallation
instructions supplied with the indoor furnace/air handler for spe-
cific wiring connections and indoor unit configuration. Likewise,
consulttheinstructionspackagedwiththethermostatformount-
ing and location information.

6
OVERCURRENT PROTECTION
Thefollowingovercurrentprotectiondevicesareapprovedforuse.
• Time delay fuses
• HACR type circuit breakers
Thesedeviceshavesufficienttimedelaytopermitthemotor-com-
pressor to start and accelerate its load.
Refer to the unit serial plate for the maximum overcurrent pro-
tection permitted.
Run all line voltage wiring a conduit from the service disconnect
box to the unit. Refer to the NEC (USA) or CEC (Canada) codes for
the correct size conduit based on the wire size. The conduit en-
ters the control box through the hole provided in the bottom.
NOTE: The control box hole is sized for 3/4” conduit. If permitted
bycode,aflexibleconduitispreferredtominimizevibrationtrans-
mission from the unit to the building.
Connect the line voltage wires to the L1, L2, and L3 terminals of
the definite purpose contactor (located in the unit control box).
Refer to the wiring diagram attached to the unit when making
these connections.
THREE PHASE COMPRESSOR ROTATION
Use care when handling scroll compressors. Dome temperatures
could be hot.
CAUTION
Threephasescrollsarepowerphasedependentandcancompress
in more than one direction.
Verify proper rotation for three phase compressors by ensuring
thesuctionpressure drops anddischargepressure rises whenthe
compressorisenergized.NOTE: Whenoperatedinreverse,athree
phase scroll compressors is noisier and its current draw substan-
tially reduced compared to marked values.
Tocorrect, disconnectpowerandswitchanytwoleads atthe unit
contactor and re-observe.
HIGH VOLTAGE CONNECTIONS
Route power supply and ground wires through the high voltage
port and terminate in accordance with the wiring diagram pro-
vided inside the control panel cover.
LOW VOLTAGE CONNECTIONS
Condensingunitcontrolwiringrequiresafive-conductorlowvolt-
agecircuitfromtheroomthermostat(withoutoptions).Thewires
should be no smaller than 18 AWG and the field connection for
this circuit must be made in the unit control box using solderless
connectors(i.e.wirenuts).Seethe followingdiagramfor atypical
low voltage hook-up.
TWO STAGE LOW VOLTAGE HOOK-UP
THERMOSTAT
OW2
CR
RED
BROWN
WHITE
BLUEBLUE
WHITE
CONDENSING
UNIT AIR
HANDLER
YELLOW
PURPLE
RED
Y1 G
GREEN
Y2
WIRE NUT
ORANGE
SYSTEM START UP
Never operate the compressor with the suction valve closed to
test the compressor’s pumping efficiency. In some cases, this can
result in serious compressor damage and loss of warranty cover-
age.
Forthe7-1/2tonunitstartingchargeshouldbe18 lbs. of R-410A and
20 lbs. for the 10 ton unit. The length of line set, indoor unit air-
flow, condensing unit location and number of tubing fittings will
have an impact on final unit charge amount. Turn the electrical
power on, and let the system run. Wait for the refrigerant pres-
sures to stabilize.
CHARGE VERIFICATION
CAUTION
NOTICE
Violation of EPA regulations may resultin fines or other penalties.
Operating the compressorwith the suction valve closed will void
the warranty and cause serious compressor damage.
CAUTION

7
FINAL CHARGE ADJUSTMENT
The outdoor temperature must be 60°F or higher. Set the room
thermostat to COOL, fan switch to AUTO, and set the tempera-
ture control well below room temperature.
After system has stabilized per startup instructions, check sub-
cooling and superheat as detailed in the following section.
EXPANSION VALVE SYSTEM
NOTE: The expansion valve bulb must be in place on the suction
line and insulated.
Expansion Valve Indoor Coils:
Outdoor Temperature Over 60ºF. When the outdoor tempera-
ture is above 60ºF, charge the system with the room thermostat
set in the “Cooling” mode and the fan operating in the “Auto”
position.
Outdoor Temperature Below 60ºF. When the outdoor tempera-
ture is below 60ºF, charge the system with the room thermostat
set in the “Heat” mode and the fan operating in the “Auto” posi-
tion.
System Charging Cooling Mode. At stabilized cooling conditions
and with an outdoor temperature of 60°F or higher, the system
should have from 9°F to 13°F subcooling. For a proper subcooling
reading,measuretherefrigerantpressureandtemperatureatthe
outdoor unit’s liquid line service valve. If you have less than 9°F
subcooling, add charge. If you have more than 13°F subcooling,
remove charge.
Whilereachingthepropersubcoolinglevelitisimportanttoknow
the discharge line temperature. This temperature should be at
least 80ºF over ambient or unit is flooding back to compressor.
System Charging Heating Mode. Measure the hot gas discharge
at the compressor to check the system charge in heat mode.
1. Allow the system to operate for at least 20 minutes.
2. Attach and insulate an electronic thermometer to the hot
gasdischargelinemidwaybetweenthecompressorandthe
reversing valve. Note: The thermometer is to be well insu-
lated to prevent ambient influences.
3. Adjust the charge to maintain a clear sight glass.
4. Allowthecompressortooperateforabout10additionalmin-
utes and measure the hot gas discharge temperature.
5. Using an additional electronic thermometer, measure the
ambient.
6. Adjustthechargeuntilthehotgastemperatureequals105ºF
+ ambient (+ or – 5ºF). Remove charge to increase the tem-
perature.
NOTE: When adjusting the charge, allow the compressor to
operate for about 10 minutes before taking readings.
NOTE: Subsequent opening and replace of the cap will require
only1/2to1 hex flat. Seethetablebelowfor the torque required
foraneffectivesealonthevalvebonnet(1/6turnpastfingertight.
TUBINGSIZE TORQUE
(ft-lbs)
5/8 14
13/8 16
Afterclosingthevalvebonnet,performafinalrefrigerantleaktest
on the valves and sweat connections. Return the room thermo-
stat to the desired settings.
DEFROST CONTROL ADJUSTMENTS
This heat pump uses a Time/Temperature method for defrost. A
thermalsensorelectricallysetto“NormallyOpen”iswiredtothe
electronic defrost control located in the control box. The thermal
sensorattachedtothecondensercoildeterminestheoutdoorcoil
temperature.
Both coil temperature and compressor “run time” determine de-
frostingoftheoutdoor coil. Adjustmentstothedefrost timing se-
lection can be changed from the 60 minute factory setting to ei-
ther 30 or 90 minutes by moving the jumper on the defrost con-
trol. Forthesystemtoinitiateadefrost,thefollowingstatements
must be true:
• The Defrost Sensor is closed, and
• The compressor “run time” is equal to the timing selection
on the defrost board.
During defrost the following actions occur:
1. The reversing valve is energized and the heat pump oper-
ates in the cooling mode.
2. The airhandler auxiliary heat (if equipped) is activated.
3. The condenser fan motor is shut-off.
If the defrost cycle has not terminated after ten (10) minutes the
control will override the defrost sensor and revert to a heating
mode.
Thedefrostcontrolhastestpinswhichcanbeusefulwhentrouble-
shootingintheheatingmode.Thesetestpinsacceleratethecom-
pressor run time counter. The suggested method for accessing
this feature is:
1. Run unit in heat mode.
2. Check unit for proper charge.
NOTE: Bands of frost indicate low refrigerant charge.
3. Shut off power to unit.

8
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.
4. Disconnect outdoor fan by removing the purple lead from
the Condenser Fan Defrost Relay.
5. Restart unit and allow frost to accumulate.
6. Afterafewminutesthedefrostthermostatshouldclose. To
verifythepositionofthe thermostatcheckfor 24Vbetween
“DFT”and“C”onthedefrostboard. Shouldthedefrostther-
mostat fail to close after a heavy build-up of frost and the
thermostatis lessthan 28°,thethermostatistobereplaced.
7. After the thermostat has closed, short across the test pins
with the a screwdriver blade until the reversing valve shifts.
This could take up to 22 seconds depending upon the posi-
tionofthetimingsettingonthedefrostboard. Immediately
upon the action of the reversing valve, remove the short.
Note: If this short is not removed immediately, the defrost
activity will last only 3 seconds.
8. After defrost has terminated (up to 10 minutes) check the
defrost thermostat for 24V between “DFT” and “C”. This
reading should be 0V (open sensor).
9. Shut off power to the unit.
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.
10. Replace outdoor fan motor wire removed in Step 4.
NOTE: Thecompressor“runtime’is accumulativeduringmultiple
heating cycles. The timer will reset to zero only when the defrost
sensor returns to an open condition. If the room thermostat is
operating in the “EM HT” mode, no accumulation of compressor
time is recorded.
TROUBLESHOOTING
Qualified Installer/Servicer only
When troubleshooting, the first step should always be to check
for clean coils, clean filter(s), and proper airflow. Indoor airflow
should be 375 to 425 CFM per ton of cooling based on the size of
the outdoor unit. The most common way of establishing indoor
airflow is heating temperature rise. Indoor airflow will then be
(Heatingoutputofequipment)/(1.1xtemp.rise).Inother cases,
measurement of external static pressure is helpful. For details,
see the Installation Instructions for your indoor unit.
TROUBLE SHOOTING ANALYSIS TABLE
COMPLAINT PROBABLE CAUSE REMEDY
1. High HeadPressure
1.Excessivechargeofrefrigerantinsystem.
2. Inadequate supply of air across the
condensercoil.
3. Non-condensate gases in the system.
1. Purge orpump-down excessive charge.
2. Make certainthat coil is not fouledin any
way, or that airisnot re-circulating.
3. Purgethesegasesfromthesystem.
Recharge system,ifnecessary.
2. LowHeadPressure 1.System low onrefrigerant.
2.Compressor valves broken. 1. Charge systemuntil sight glass is clear of bubbles. 2. Replace compressor.
3. LowSuctionPressure
1.Liquid line valve closed.
2.Restrictedliquid line.
3. The bulb of the thermal expansionvalve
haslostits charge.
4.System low onrefrigerant.
5.Dirty filters.
6.Coilfrosted up.
7. Flash gas in the liquid line.
8.Quantity ofairthroughevaporator notadequate.
1. Open the liquid line valve.
2. Replacefilter-dryer.
3. Detach the bulb from the suction line andhold
in one hand. If noliquid refrigerant goes through
thevalve, replacethe valve.
4. Test the unit forleaks. Addrefrigerantuntil sight
glass is free frombubbles, after repairingleak.
5. Cleanor replace filter.
6. Defrost and clean coil.Clean or replace filters.
7. Excessive liquidline drop.Checkliquidline size.
8. Increase theblower speed.
4. High SuctionPressure
1.Expansionvalve stuckopen.
2.Expansionvalve bulbnot incontact with
suction line.
3. Suction and/or discharge valve leaking or broken.
1. Correctvalveactionor replacethevalve.
2. Fastenbulb securelyto suctionline.
3. Replace compressor.
5. Compressor will not start.
1.Disconnect switchopen.
2.Blownfuseorfuseatdisconnect switch.
3.Thermostat set too high.
4. Selectorswitch in "Off" position.
5.Contactorand/orrelay coils burned out.
6.Loose or openelectrical connectionineither
the controlor powercircuit.
1. Closethedisconnectswitch.
2. Check thecauseof failureandreplacethefuse.
3. Adjust to lower temperature.
4. Turn selector switch knobto "Cool" position.
5. Replace contactor and/or relay.
6. Inspect andsecureall electrical connections.

9
Solenoid does notenergize when voltage is present. Replace the reversing valve.
No voltage to the solenoid. Checkthe wiring.
The valve will notshift.
a.Undercharged Check for leaks
b.Valve bodydamage Replace the reversing valve
c. Valve sticking Replace the reversing valve
COMMON CAUSES FOR UNSATISFACTORY
OPERATION OF HEAT PUMPS IN HEATING MODE
Dirty Filters
Dirtyfiltersor inadequate airflowthroughtheindoor coil. Failure
tokeepcleanfiltersand adequate airflow (375-425 CFM/ton) will
causeexcessivedischargepressuresthatmaycausethehigh-pres-
sure switch to function.
Low Return Air Temperatures
Return ductwork temperatures that are less than 60°F will cause
low discharge pressure, low suction pressure and excessive de-
frost cycling.
Undercharging
An undercharged system will cause low discharge pressure, low
suction pressure and an accumulation of frost on the lower sec-
tion of the outdoor coil.
Poor Termination of Defrost
The defrost sensor must make good contact with the outside coil
return bend or a non-termination of defrost may occur.
Reversing Valve
Areversing valvemay notfunctioncorrectlyforthefollowingrea-
sons:

10
THIS PAGE LEFT INTENTIONALLY BLANK

Wiring is subject to change, always refer to the wiring diagram on the unit for the most up-to-date wiring.
HIGH VOLTAGE! D
ISCONNECT
ALL
POWER
BEFORE
SERVICING
OR
INSTALLING
THIS
UNIT
.
M
ULTIPLE
POWER
SOURCES
MAY
BE
PRESENT
. F
AILURE
TO
DO
SO
MAY
CAUSE
PROPERTY
DAMAGE
,
PERSONAL
INJURY
OR
DEATH
.
11
WIRING DIAGRAM
NOTES: 1) TO INDOOR UNIT LOW VOLTAGE TERMINAL BLOCK & INDOOR THERMOSTAT. USE N.E.C. CLASS 2 WIRE 2) CRANKCASE HEATER FACTORY INSTALLED OPTION. 3) USE COPPER CONDUCTORS ONLY 4) 40VA MINIMUM TRANSFORMER IS REQUIRED 5) COMMON SIDE OF TRANSFORMER MUST BE GROUNDED 6) W2 WILL BE INSTALLED TO AUXILIARY HEAT COMMAND AT THE INDOOR UNIT
OR
YL
BL
O Y1
C
R
SEE NOTE 1, 3 & 6
COMPONENT CODE C --------------- CONTACTOR
CH ------------- CRANKCASE HEATER
CM ------------ OUTDOOR FAN MOTOR COMP -------- COMPRESSOR DC ------------- DEFROST CONTROL DFT ----------- DEFROST THERMOSTAT FC ------------- FAN CAPACITOR HVDR -------- HIGH VOLTAGE DEFROST RELAY IO -------------- INTERNAL OVERLOAD LPS ------------ LOW PRESSURE SWITCH
LVDR --------- LOW VOLTAGE DEFROST RELAY
LVJB ---------- LOW VOLTAGE JUNCTION BOX
RVC ----------- REVERSING VALVE COIL
CMR ----------- CONDENSER MOTOR RELAY
CS---------------- COMPRESSOR SOLENOID HPS ----------- HIGH PRESSURE SWITCH CHS ----------- CRANKCASE HEATER SWITCH SSHR---------- SECOND STAGE HEAT RELAY
CONTROLS SHOWN WITH THERMOSTAT IN 'OFF' POSITION.
WIRING CODE
FACTORY WIRING HIGH VOLTAGE LOW VOLTAGE OPTIONAL HIGH VOLTAGE FIELD WIRING
HIGH VOLTAGE LOW VOLTAGE
LVJB
CONTROL BOX
BK
BR
PU
BK
DFT
YL/PK
LPS
DFT
W
O-RV
DC
RVC
BK
BK
CH
BK
W2
RD
YL
C
T1
L1
T2
L2
T3
L3
YL
RD
FC
PU
BR
PU
3
1
CMR
BL
BL
BK
BL/PK
BL/PK
HPS
RD
BK
BK
CMR
COLOR CODE
BK --------------- BLACK
BL --------------- BLUE
BR --------------- BROWN
OR --------------- ORANGE PK ---------------- PINK
PU --------------- PURPLE RD --------------- RED
WH -------------- WHITE
YL --------------- YELLOW YL/PK ---------- YELLOW W/PINK HASH MARKS
BL/PK ---------- BLUE W/PINK HASH MARKS
L1 L2 L3
DC
RD
BK
BL
RD
BL/PK
WH
T1
C
FC
T3
C
L1 L3
L2
C
T2
CH
YPS1 PS2 CNT
DFT
R-DFT
C-RV DF2 DF1
O
LPS
HPS
W2 Y1
O
C
CMR
RVC
RC
OUTDOOR POWER SUPPLY SEE
RATING PLATE
SEE NOTE 3
2
1 3
COMP
L1 L2 L3
CM
COMP
S
C
R
CM
YL
YL/PK
OR
WH
RD
BL
BK
BL
R
DF1
DF2
0
0-RV
C-RV
W
LVDR
HVDR
CCR
CNT
0
DFT
R-DFT
R-PS1
Y
Y
C
R
C
C
PS2
RD
RD
RD
RD
SEE NOTE 2
SEE NOTES 4 & 5
(IF USED)
NOTE 2
SEE NOTE 3
SEE NOTE 3 INDOOR POWER SUPPLY
↑
BL
24
56
13
Y2
CS
SSHR
CS
Y2
WH
BL
YL
0140R00619 - B
RD
WH
PU
PU
PU
PU
YL
YL
PU
BK
BK
BL
YL
YL
BL
OR YL
BK
YL/PK
BK
SEE NOTE 3
SEE NOTE 3
2
4
3
1
SSHR
SEE NOTES 1 & 3

12
Our continuing commitment to quality products may mean a change in specifications without notice.
©2018 5151 San Felipe St., Suite 500, Houston, TX 77056
www.daikinac.com