Nortek JS4BD-KA User manual
SPLIT SYSTEM AIR CONDITIONER
INSTALLATION INSTRUCTIONS
IMPORTANT SAFETY INFORMATION .................2
AIR CONDITIONER INSTALLATION ....................3
General Information ..............................................3
BeforeYou Install this Unit.....................................3
Locating the Air conditioner...................................3
Packaging Removal ..............................................3
Ground Level.........................................................3
Roof Mount............................................................3
Connecting Refrigerant Tubing between the
Indoor & Outdoor Unit...........................................4
ELECTRICALWIRING...........................................4
Pre - Electrical Checklist.......................................4
Line Voltage...........................................................4
Comfort AlertTM Diagnostics Module .....................5
24VAC Power Wiring...........................................5
Thermostat Demand Wiring................................5
Interpreting the Diagnostic LED’s .......................5
LED Description..................................................6
Grounding .............................................................6
Reverse Rotation Verification................................6
Unbalanced 3-Phase Supply Voltage....................6
Thermostat Low / Voltage Connections.................7
STARTUP & ADJUSTMENTS ...............................7
Pre - Start Checklist..............................................7
Start-up Procedures..............................................7
Air Circulation - Indoor Blower ..............................7
System Cooling.....................................................7
System Heating.....................................................7
DO NOT DESTROY. PLEASE READ CAREFULLY & KEEP IN A SAFE PLACE FOR FUTURE REFERENCE.
IMPORTANT
ATTENTION INSTALLERS:
It is your responsibility to know this product better than your customer. This includes being
able to install the product according to strict safety guidelines and instructing the customer on
how to operate and maintain the equipment for the life of the product.Safety should always be
the deciding factor when installing this product and using common sense plays an important
role as well.Pay attention to all safety warnings and any other special notes highlighted in the
manual. Improper installation of the furnace or failure to follow safety warnings could result in
serious injury, death, or property damage.
These instructions are primarily intended to assist qualified individuals experienced in the
proper installation of this appliance. Some local codes require licensed installation/service
personnel for this type of equipment. Please read all instructions carefully before starting the
installation. Return these instructions to the customer’s package for future reference.
S4BD - 018, 024, 030, 036, 042, 048, & 060 (1.5, 2, 2.5, 3, 3.5, 4, & 5Ton) Series
13 SEER, SINGLE & 3-PHASE MODELS
Refrigerant Charging.............................................7
Charging the Unit in AC Mode with
Outdoor Temperatures Above 55° F......................8
AIR CONDITIONER MAINTENANCE....................8
COMPONENT FUNCTIONS..................................8
CHARGINGTABLES & CHARTS..........................9
Table 3. Charging Table for 1.5 Ton Units.......... 10
Table 4. Charging Table for 2 Ton Units............. 10
Table 5. Charging Table for 2.5 Ton Units.......... 10
Table 6. Charging Table for 3 Ton Units............. 11
Table 7. Charging Table for 3.5 Ton Units.......... 11
Table 8. Charging Table for 4 Ton Units............. 11
Table 9. Charging Table for 5 Ton Units............. 12
Figure 3. Charging Chart for 1.5 Ton Units........ 12
Figure 4. Charging Chart for 2 Ton Units........... 13
Figure 5. Charging Chart for 2.5 Ton Units........ 13
Figure 6. Charging Chart for 3 Ton Units........... 14
Figure 7. Charging Chart for 3.5 Ton Units........ 14
Figure 8. Charging Chart for 4 Ton Units........... 15
Figure 9. Charging Chart for 5 Ton Units........... 15
ELECTRICAL DIAGRAMS &TABLES................ 16
Figure 10.W.D., Single Phase (1.5 - 5 Ton)...... 16
Figure 11.W.D., 3-Phase, (3, 4, & 5 Ton).......... 17
Table 10. Comfort Alert LED Diagnostics.......... 18
Table 11. Module Wiring Troubleshooting.......... 19
INSTALL. / PERFORMANCE CHECKLIST......... 20
REPLACEMENT PARTS...................................... 20
2
WARNING:
The information listed below must be followed
during the installation, service, and operation
of this unit. Unqualified individuals should
not attempt to interpret these instructions or
install this equipment. Failure to follow safety
recommendations could result in possible
damage to the equipment, serious per
sonal
injury or death
.
• The installer must comply with all local codes and
regulations which govern the installation of this type
of equipment. Local codes and regulations take
precedence over any recommendations contained in
these instructions. Consult local building codes and
the National Electrical Code (ANSI CI) for special
installation requirements.
• Allelectricalwiringmustbecompletedinaccordance
with local, state and national codes and regulations
and with the National Electric Code (ANSI/NFPA 70)
or in Canada the Canadian Electric Code Part 1 CSA
C.22.1.
• Thisequipmentcontainsliquidandgaseousrefrigerant
underhighpressure.DONOTUSEANYPORTIONOF
THE CHARGE FOR PURGING OR LEAK TESTING.
Installation or servicing should only be performed by
qualifiedtrainedpersonnelthoroughlyfamiliarwiththis
type equipment.
• Fullyannealed,refrigerantgradecoppertubingshould
beusedwheninstallingthesystem.Refrigerantsuction
line tubing should be fully insulated.
• Installation of equipment may require brazing
operations. Installer must comply with safety codes
andwearappropriatesafetyequipment(safetyglasses,
work gloves, fire extinguisher, etc.) when performing
brazingoperations.
• Followallprecautionsintheliterature,ontags,and
on labels provided with the equipment. Read and
thoroughly understand the instructions provided with
the equipment prior to performing the installation and
operational checkout of the equipment.
• Refrigerantandelectricallineshouldberoutedthrough
suitably waterproofed openings to prevent water from
leaking into the structure.
IMPORTANT SAFETY INFORMATION
INSTALLER: Please read all instructions before
servicing this equipment. Pay attention to all safety
warnings and any other special notes highlighted
in the manual. Safety markings are used frequently
throughoutthismanualtodesignateadegreeorlevel
of seriousness and should not be ignored.
WARNINGindicatesapotentiallyhazardoussituation
that if not avoided, could result in personal injury or
death.
CAUTIONindicatesapotentiallyhazardoussituation
that if not avoided, may result in minor or moderate
injury or property damage.
WARNING:
Shut off all electrical power to the unit before
performing any maintenance or service on the
system.Failuretocomplymayresultinpersonal
injury or death.
WARNING:
Unless noted otherwise in these instructions,
only factory authorized parts or accessory
kits may be used with this product. Improper
installation,service,adjustment,ormaintenance
may cause explosion, fire, electrical shock or
other hazardous conditions which may result
in personal injury or property damage
WARNING:
S4BDSplitSystemAirConditionersareshipped
charged with R410A refrigerant and ready
for installation. If repairs make it necessary
for evacuation and charging, it should only
be attempted by qualified trained personnel
thoroughly familiar with this equipment. Under
no circumstances should the owner attempt to
install and/or service this equipment.Failure to
complywiththiswarningcouldresultinproperty
damage, personal injury, or death.
CAUTION:
This unit uses refrigerant R-410A. DO NOT use
any other refrigerant in this unit.Use of another
refrigerant will damage the unit.
3
AIR CONDITIONER INSTALLATION
General Information
The S4BD series air conditioner is designed only for
outdoorrooftopor groundlevelinstallations.This unithas
been tested for capacity and efficiency in accordance
with AHRI Standards and will provide many years of safe
and dependable comfort, providing it is properly installed
and maintained. Abuse, improper use, and/or improper
maintenance can shorten the life of the appliance and
createunsafehazards.
Toachieveoptimumperformanceandminimizeequipment
failure, it is recommended that periodic maintenance be
performed on this unit. The ability to properly perform
maintenance on this equipment requires certain
mechanical skills and tools.
BeforeYou Install this Unit
√Thecoolingloadofthearea to beconditioned mustbe
calculatedandasystemofthepropercapacityselected.
It is recommended that the area to be conditioned be
completely insulated and vapor sealed.
√Checktheelectricalsupplyandverifythepowersupply
isadequateforunitoperation.Thesystemmustbewired
andprovidedwithcircuitprotectioninaccordancewith
localbuildingcodes.Ifthereisanyquestionconcerning
the power supply, contact the local power company.
√Theindoorsection(airhandler,furnace,etc)shouldbe
installed before routing the refrigerant tubing.Refer to
theindoorunit'sinstallationinstructionsforinstallation
details.
√Allunitsaresecurelypackedatthetimeofshipmentand
upon arrival should be carefully inspected for damage
prior to installing the equipment at the job site.Verify
coilfins arestraight.If necessary,combfins toremove
flattened or bent fins.Claims for damage (apparent or
concealed)shouldbefiledimmediatelywiththecarrier.
√Pleaseconsultyourdealerformaintenanceinformation
andavailabilityofmaintenancecontracts.Pleaseread
all instructions before installing the unit.
Locating the Air Conditioner
• Surveythejobsitetodeterminethebestlocationfor
mounting the outdoor unit.
• Theoutdoor unitshouldbe installed nocloser than
18 inches from the outside walls of the facility and in
an area free from overhead obstructions to ensure
unrestricted airflow through the outdoor unit.
• Sufcientclearanceforunobstructedairowthroughthe
outdoorcoilmustbemaintainedinordertoachieverated
performance.See Figure1 for minimumclearancesto
obstructions.
• Overhead obstructions (Figure 1), poorly ventilated
areas, and areas subject to accumulation of debris
should be avoided.
• Considerationshouldbegiventoavailabilityofelectric
power, service access, noise, and shade.
Packaging Removal
NOTE: To prevent damage to the tubing connections,
carefully remove the carton and user’s manual from the
equipment. Discard the shipping carton.
Ground Level
Ground level installations must be located according to
localbuildingcodesorordinancesandtheserequirements:
• Clearancesmustbeinaccordancewiththoseshown
in Figure 1.
• Asuitablemountingpad(Figure1)mustbeprovided
and separate from the building foundation. The pad
mustbe levelandstrongenoughtosupporttheweight
of the unit.The slab height must be a minimum of 2”
(5 cm) above grade and with adequate drainage.
Roof Mount
• The method of mounting should be designed so that it
does not overload roof structures or transmit noise to
theinteriorofthestructure.Theroofmustbestructurally
capable of handling the weight of the unit.
• Full perimeter support is required under the unit.
Support must be made of weather resistant materials
and installed prior to unit installation.
• Thesupportmustbebuilttoraisetheunit6"above
the roof.
Figure 1. Clearance Requirements
2” Mounting Pad
24" for
Service Access
12" or 18”
See Note
12" or 18”
See Note
DO NOT
OBSTRUCT
TOP OF UNIT
NOTE: Units require full perimeter clearances.
Installer must maintain 18” between two units
or 12” between single unit and structure.
6” from Building
or Structure
48”
4
Connecting Refrigerant Tubing Between the Indoor
& Outdoor Unit
CAUTION:
When servicing, cover or seal openings to
minimizetheexposureoftherefrigerantsystem
to air to prevent accumulation of moisture and
other contaminants.
After outdoor and indoor unit placement has been
determined, route refrigerant tubing between the
equipmentinaccordancewithsoundinstallationpractices.
• When connecting refrigerant linesets together, it is
recommended that dry nitrogen be flowing through
thejointsduringbrazingtopreventinternaloxidation
and scaling.
• Refrigeranttubingshouldberoutedinamannerthat
minimizesthelengthoftubingandthenumberofbends
in the tubing. If precise forming of refrigerant lines is
required, a copper tubing bender is recommended.
Avoid sharp bends and contact of the refrigerant lines
with metal surfaces.
• Refrigeranttubingshouldbesupportedinamanner
thatthetubingwillnotvibrateorabradeduringsystem
operation.
• Tubingshouldbekeptcleanofforeigndebrisduring
installation.
• Everyeffortshouldbemadebytheinstallertoensure
thatthefieldinstalledrefrigerantcontainingcomponents
of the system have been installed in accordance with
these instructions and sound installation practices to
insure reliable system operation and longevity.
• The maximum recommended interconnecting
refrigerantlinelengthsis75ft.andtheverticalelevation
difference between the indoor and outdoor sections
should not exceed 20 ft.
• A lter dryer is provided with the unit and must be
installedintheliquidlineofthesystem.Iftheinstallation
replaces a system with a filter dryer already present
in the liquid line, the filter dryer must be replaced with
the one supplied with the unit.The filter dryer must be
installed in strict accordance with the manufacturer’s
installation instructions.
• Optional equipment such as liquid line solenoid
valves, low ambient, etc., should be installed in
strict accordance with the manufacturer’s installation
instructions.
ELECTRICALWIRING
WARNING:
To avoid risk of electrical shock, personal
injury, or death, disconnect all electrical power
to the unit before performing any maintenance
or service. The unit may have more than one
electrical supply.
Label all wires prior to disconnection when
servicing the unit. Wiring errors can cause
improper and dangerous operation.
• Allelectricalconnectionsmustbeincompliancewith
all applicable local codes and ordinances, and with
the current revision of the National Electric Code
(ANSI/NFPA 70).
• ForCanadianinstallationstheelectricalconnections
andgroundingshall complywith thecurrentCanadian
Electrical Code (CSA C22.1 and/or local codes).
Pre-Electrical Checklist
√Verify that the voltage, frequency, and phase of the
supply source match the specifications on the unit
rating plate.
√Verifythattheserviceprovidedbytheutilityissufficient
tohandletheadditionalloadimposedbythisequipment.
Refer to the unit wiring label for proper voltage wiring.
√Verifyfactorywiringisinaccordancewiththeunitwiring
diagram (Figures 10 & 11, pages 16 & 17).Inspect for
loose connections.
√Phase balance on 3 phase units must always be
checked. See Unbalanced 3-Phase Supply Voltage
section (page 6).
LineVoltage
• Awiringdiagramislocatedontheinsidecoverofthe
electrical box of the outdoor unit.The installer should
becomefamiliarwiththewiringdiagrambeforemaking
any electrical connections to the outdoor unit.
• An electrical disconnect must be located within
sight of and readily accessible to the unit. This
switchshall be capableofelectrically de-energizing
the outdoor unit.
• Line voltage to the unit should be supplied from a
dedicated branch circuit containing the correct fuse
or circuit breaker for the unit. Incoming field wiring
andminimumsizeofelectricalconductorsandcircuit
protectionmustbeincompliancewithinformationlisted
ontheoutdoorunitdatalabel.Anyotherwiringmethods
must be acceptable to authority having jurisdiction.
• Theoutdoorunitrequiresbothpowerandcontrolcircuit
electrical connections. Refer to the wiring diagram /
schematic for identification and location of outdoor
unit field wiring interfaces (Figures 10 & 11, pages 16
& 17). Make all electrical connections in accordance
with all applicable codes and ordinances.
5
• Overcurrentprotectionmustbeprovidedatthebranch
circuitdistributionpanelandsizedasshownontheunit
rating label and according to applicable local codes.
See the unit rating plate for minimum circuit ampacity
and maximum overcurrent protection limits.
• Providepowersupplyfortheunitinaccordancewiththe
unit wiring diagram, and the unit rating plate.Connect
theline-voltageleadstotheterminalsonthecontactor
inside the control compartment.
• Useonlycopperwireforthelinevoltagepowersupply
tothisunitaslistedinTable1.Usepropercodeagency
listed conduit and a conduit connector for connecting
the supply wires to the unit. Use of rain tight conduit
is recommended.
• 208/230Voltunitsareshippedfromthefactorywired
for230 voltoperation.For208Voperation,removethe
lead from the transformer terminal marked 240V and
connect it to the terminal marked 208V.
• Optionalequipmentrequiringconnectiontothepower
or control circuits must be wired in strict accordance
of the NEC (ANSI/NFPA 70), applicable local codes,
and the instructions provided with the equipment.
COPPERWIRE SIZE — AWG
(1%Voltage Drop)
SupplyWire Length-Feet Supply Circuit
Ampacity
200 150 100 50
6 8 10 14 15
4 6 8 12 20
4 6 8 10 25
4 4 6 10 30
3 4 6 8 35
3 4 6 8 40
2 3 4 6 45
2 3 4 6 50
2 3 4 6 55
1 2 3 4 60
WireSizebasedonN.E.C.for60°typecopperconductors.
Table 1. CopperWire Size
Comfort AlertTM Diagnostics Module
(Select Models Only)
The Comfort AlertTM Diagnostics Module (Figure 2) is a
breakthrough innovation for troubleshooting heat pump
and air conditioning system failures.The module installs
easily in the electrical box of the outdoor unit near the
compressorcontactor.Bymonitoringandanalyzingdata
from the Copeland scroll compressor and the thermostat
demand, the module can accurately detect the cause of
electricalandsystemrelatedfailureswithoutanysensors.
A flashing LED indicator communicates the ALERT code
and a diagnostic key is also imprinted on the side of the
module to quickly direct the technician to the root cause
ofaproblem.NOTE:Thismoduledoesnotprovidesafety
protection! The Comfort AlertTM Diagnostics Module is a
monitoring device and cannot control or shut down other
devices.
Figure 2. Comfort AlertTM Diagnostics Module
POWER LED
(Green)
TRIP LED
(Red)
ALERT LED
(Yellow)
Diagnostics
Key
24 VAC Power Wiring
The Comfort AlertTM module requires a constant nominal
24VAC power supply.The module cannot be powered by
the Cterminal on a defrost board or other control board
without experiencing nuisance alerts. NOTE: The wiring
to the module’s R& Cterminals must be routed directly
from the indoor unit or thermostat.
Iftheconstant24VAC(Rwire)isnotpresentintheoutdoor
unit,use oneofthe sparewiresin thethermostatcableto
bring power to the module.Connect the other end of the
spare wire to Rat the indoor unit or thermostat.
Thermostat Demand Wiring
TheComfortAlertTM modulerequiresathermostatdemand
signal to operate properly. The thermostat demand
signal input (labeled Yon the module), should always be
connectedtothecompressorcontactorcoil.NOTE:When
thecoilisenergized,thedemandsignalinputis24VAC.
Whenthecoilisnotenergized,thedemandsignalinput
should be less than 0.5 VAC.
NOTES:
• Factory installed modules have different thermostat
demand signal wiring. Always follow manufacturer
wiring instructions when replacing the module.
• Afterthethermostatdemandsignalisconnected,verify
that 24 VAC across Y& Cwhen demand is present.
Interpreting the Diagnostic LED’s
Whenanabnormalsystemconditionoccurs,theComfort
AlertTM module displays the appropriate ALERT and/or
TRIP LED will flash a number of times consecutively,
pause and then repeat the process. To identify a Flash
Code number, count the number of consecutive flashes.
Each time the module powers up, the last ALERT Flash
Code that occurred prior to shut down is displayed for
one minute.The module will continue to display the LED
6
until the condition returns to normal or if 24 VAC power
is removed from the module.See Table 10 (page 18) for
flash code identification orTable 11 (page 19) for module
wiring troubleshooting.
LED Description
• POWERLED(Green):indicatesvoltageispresentat
the power connection of the module.
• ALERT LED (Yellow): communicates an abnormal
system condition through a unique flash code.
NOTE:TheALERTLEDwillflashconsecutively,pause
andthenrepeattheprocess.Thenumberofconsecutive
flashes, referred to as the Flash Code, correlates to a
particularabnormalcondition.Detaileddescriptionsof
theseALERTFlashCodesarelistedinTables10&11.
• TRIPLED(Red):indicatesademandsignalisreceived
from the thermostat, but current to the compressor is
not detected by the module. The TRIP LED typically
indicates if the compressor protector is open or the
compressor has no power.
The scroll compressor’s R (run), C(common), and S
(start) wires are routed through the holes in the Comfort
AlertTM module marked R, C, & S.NOTE: The common
wire does not need to be routed through the module for
it to operate.
Example:
AB = 226V
BC = 230V
AC = 227V
2.Determine the average voltage in the power supply.
3.Determine the maximum deviation:
4.Determine percent of
voltage imbalance by
using the results from
steps2&3inthefollowing
equation.
2
228
100 x= 0.88%
Example:
1.Measurethelinevoltages
of your 3 phase power
supplywhereit entersthe
building and at a location
thatwillonlybededicated
to the unit installation (at
theunitscircuitprotection
or disconnect).
Unbalanced 3-Phase SupplyVoltage
Voltageunbalanceoccurswhenthevoltagesofallphases
of a 3-phase power supply are no longer equal. This
unbalance reduces motor efficiency and performance.
Someunderlyingcausesofvoltageunbalancemayinclude:
Lackofsymmetryintransmissionlines,largesingle-phase
loads, and unbalanced or overloaded transformers. A
motorshouldneverbeoperatedwhenaphaseimbalance
in supply is greater than 2%.
Perform the following steps to determine the percentage
of voltage imbalance:
In this example, the measured line voltages were
226,230,and227.Theaveragewouldbe228volts
(226 + 230 + 227 = 683 / 3 = 228).
The amount of phase imbalance (0.88%) is satisfactory
since the amount is lower than the maximum allowable
2%. Please contact your local electric utility company if
your voltage imbalance is more than 2%.
Example:
From thevaluesgiveninstep 1,the BC voltage
(230V) is the greatest difference in value from
the average:230 - 228 = 2
228 - 226 = 2
228 - 227 = 1
Highest Value
maxvoltage deviation
fromaverage voltage
=100 x averagevoltage
% Voltage Imbalance
Grounding
WARNING:
The unit cabinet must have an uninterrupted or
unbroken electrical ground to minimize personal
injury if an electrical fault should occur. Do not
use gas piping as an electrical ground!
This unit must be electrically grounded in accordance
with local codes or, in the absence of local codes, with
the National Electrical Code (ANSI/NFPA 70) or the CSA
C22.1Electrical Code.Usethe groundinglugprovided in
the control box for grounding the unit.
Reverse Rotation Verification
After making all of the power connections to the unit, the
rotationofthecompressormustbechecked.Iftherotation
is in the wrong direction, the compressor will make an
abnormally loud noise.To check the rotation perform the
following steps:
1.Make sure the outside power disconnect is in the OFF
position.
2.Set the indoor thermostat to a set point that will call for
cooling.
3.Retun to the outside power disconnect and switch it
to the ON position. If the compressor is making an
abnormally loud noise, immediately switch the outside
power disconnect to the OFF position.
4.Switch any two of the three power leads at the power
connections to the unit.
5.SetReturn to the outside power disconnect and swith
it to the ON position.
6.Verify that the compressor is now running properly.
7
2.Verifytheblowerrunscontinuously.Checktheairdelivery
at the supply registers and adjust register openings for
balanced air distribution. If insufficient air is detected,
examine ductwork for leaks or obstructions.
3.Set the thermostat fan mode to AUTO and verify the
blower stops running.
System Cooling
1.Set the thermostat’s system mode to COOL and the
fan mode to AUTO. Gradually lower the thermostat
temperature setpoint below room temperature and
verifytheoutdoorunitandindoorblowerenergize.
2.Verifyblowerwheel isspinningindirectionindicatedby
arrow.Feeltheairbeingcirculatedbytheindoorblower
and verify that it is cooler than ambient temperature.
Listenforanyunusualnoises.If unusualsoundsoccur,
determine the source of the noise and correct as
necessary.
3.Verify HI and LO refrigerant pressures.
4.Allowthesystemtooperateforseveralminutesandthen
set the temperature selector above room temperature.
Verify the fan and compressor cycle off with the
thermostat.NOTE:Theblowershouldalsostop unless
fan mode is set to the ON position.
System Heating (optional)
1.Set the thermostat's system mode to HEAT and the
temperature mode above room temperature.
2.Verify the optional heating equipment (furnace or
electricheat)andindoorblowerenergize.Feeltheair
being circulated by the indoor blower and verify that
it is warmer than ambient temperature. Listen for any
unusualnoises.Ifunusualsoundsoccur,determinethe
source of the noise and correct as necessary.
Refrigerant Charging
WARNING:
S4BDSplitSystemAirConditionersareshipped
charged with R410A refrigerant and ready
for installation. If repairs make it necessary
for evacuation and charging, it should only
be attempted by qualified trained personnel
thoroughly familiar with this equipment. Under
no circumstances should the owner attempt to
install and/or service this equipment.Failure to
complywiththiswarningcouldresultinproperty
damage, personal injury, or death.
After refrigerant line connections are completed, it is
required that you leak check and evacuate the indoor
section and all line connections (using proper methods)
beforenalizingthefullsystemrefrigerantcharge.
• Refrigerant charging charts are applicable only to
matched assemblies of NORDYNE equipment and
listed airflows for the indoor coil. Refer toTables 3 - 9
START UP & ADJUSTMENTS
Pre-Start Check List
√Verify the indoor unit is level and allows proper
condensate drainage.
√Verify the outdoor coil and top of the unit are free from
obstructions and debris, and all equipment access/
control panels are in place.
√Verify air filters are cleaned and properly installed.
√Verify duct work is sealed to prevent air leakage.
√Verifylinevoltagepowerleadsaresecurelyconnected
and the unit is properly grounded.
√Verify low voltage wires are securely connected to the
correct leads on the low voltage terminal strip.
√Verifypowersupplybranchcircuitovercurrentprotection
issizedproperly.
√Verify the thermostat is wired correctly.
Start-Up Procedures
Thethermostat'sfunctionmodeshouldbesettoOFFand
the fan mode should be set to AUTO. Close all electrical
disconnectstoenergizethesystem.
Air Circulation - Indoor Blower
1.Set the thermostat system mode on OFF and the fan
mode to ON.
Thermostat Connections
• Thermostatconnectionsshouldbemadeinaccordance
with the instructions supplied with the thermostat and
the indoor equipment.
• Theoutdoorunitisdesignedtooperatefroma 24VAC
Class II control circuit.The control circuit wiring must
comply with the current provisions of the NEC (ANSI/
NFPA 70) and with applicable local codes having
jurisdiction.
• The low voltage wires must be properly connected to
the units low voltage terminal block. Recommended
wire gauge and wire lengths for typical thermostat
connections are listed in Table 2.
• The thermostat should be mounted about 5 feet
above the floor on an inside wall.DO NOT install the
thermostat on an outside wall or any other location
whereitsoperationmaybeadverselyaffectedbyradiant
heat from fireplaces, sunlight, or lighting fixtures, and
convective heat from warm air registers or electrical
appliances. Refer to the thermostat manufacturer’s
instructionsheetfordetailedmountingandinstallation
information.
Table 2.Thermostat Wire Gauge
Thermostat
Wire Gauge
RecommendedT-StatWire
Unit toT-Stat (Length in FT)
2-Wire
(Heating) 5-Wire
(Heating/Cooling)
24 55 25
22 90 45
20 140 70
18 225 110
8
AIR CONDITIONER MAINTENANCE
WARNING:
To prevent electrical shock, personal injury, or
death,disconnectallelectricalpowertotheunit
before performing any maintenance or service.
The unit may have more than one electrical
supply.
Proper maintenance is important to achieve optimum
performancefromtheairconditioner.Theabilitytoproperly
perform maintenance on this equipment requires certain
mechanical skills and tools. If you do not possess these
skills, contact your dealer for maintenance.Consult your
localdealerabouttheavailabilityofmaintenancecontracts.
Routine maintenance should include the following:
• Inspectandcleanorreplaceairltersatthebeginning
ofeachheatingandcoolingseason,ormorefrequently
if required.
• Inspectthecondensatedrainandoutdoorcoilatthe
beginningofeachcoolingseason.Removeanydebris.
(pages 10 -12) and Figures 3 - 9 (pages 12 - 15) for
correct system charging.
• S4BDoutdoorunitswithnon-AHRIlistedindoorcoils
arenotrecommended.Deviationsfromratedairflowsor
non-listedcombinationsmayrequiremodificationtothe
expansiondeviceandrefrigerantchargingprocedures
for proper and efficient system operation.
• Therefrigerantchargecanbecheckedandadjusted
through the service ports provided external to the
outdoor unit. Use only gage line sets which have a
“Schrader” depression device present to actuate the
valve.
Charging the Unit in AC mode at outdoor temperatures
above55°Fforoptimizedsub-coolingof10°F-12°F.
1.Withthesystemoperatingatsteady-state,measurethe
liquid refrigerant pressure (in psig) at the outdoor unit
service valve.
2.Measure the liquid refrigerant temperature (in
Fahrenheit) at the service valve.
3.Determinetherequiredliquidrefrigerantpressurefrom
the appropriate charging chart (Figures 3 - 9).
•IfthepressuremeasuredinStep1isgreaterthan
therequiredliquidrefrigerantpressuredeterminedin
Step3,thenthereistoomuchchargeinthesystem.
Remove refrigerant and repeat Steps 1 through 3
until the system is correctly charged.
•IfthepressuremeasuredinStep1islessthanthe
required liquid refrigerant pressure determined in
Step 3, there is too little charge in the system. Add
refrigerant and repeat Steps 1 through 3 until the
system is correctly charged.
COMPONENT FUNCTIONS
Comfort AlertTM Diagnostics (Select Models Only)
The Comfort Alert diagnostics module troubleshoots
heat pump and air conditioning system failures and
accurately detects the cause of electrical and system
related failures without any sensors. A flashing LED
indicatorcommunicatestheALERTcodetoquicklydirect
the technician to the root cause of a problem.
High Pressure Switch (HPS) - A high-pressure switch
is factory-installed and located in the liquid line internal
to the outdoor unit.The switch is designed to protect the
systemwhen very highpressures occur during abnormal
conditions.Undernormalconditions,theswitchisclosed.
Iftheliquidpressurerisesabove575psig,thentheswitch
willopenandde-energizetheoutdoorunit.Theswitchwill
close again once the liquid pressure decreases to 460
psig.Pleasenotethattheswitchinterruptsthethermostat
inputs to the unit.Thus, when the switch opens and then
closes,theremaybea5minuteshortcyclingdelaybefore
theoutdoorunitwillenergize.
Low-Pressure Switch - (Select Models) A low-pressure
switch is factory-installed and located in the suction line
internal to the outdoor unit. The switch is designed to
protectthecompressorfromalossofcharge.Undernormal
conditions,theswitchisclosed.Ifthesuctionpressurefalls
below5psig,thentheswitchwillopenandde-energizethe
outdoor unit.The switch will close again once the suction
pressure increases above 20 psig. Please note that the
switch interrupts the thermostat inputs to the unit.When
theswitchopensandthen closes,therewillbea 5 minute
shortcyclingdelaybeforetheoutdoorunitwillenergize.
Cleantheoutdoorcoil andlouversasnecessary using
amilddetergentandwater.Rinsethoroughlywithwater.
• Inspecttheelectricalconnectionsfortightnessatthe
beginningofeachheatingandcoolingseason.Service
as necessary.
CAUTION:
The unit should never be operated without a
filterinthereturnairsystem.Replacedisposable
filters with the same type and size.
• Do not attempt to add additional oil to motors un-
equippedwithoiltubes.Thecompressorishermetically
sealed at the factory and does not require lubrication.
9
S4BD REFRIGERANT CHARGING CHARTS - COOLING ONLY
Application Notes on the Use of Charging Charts
NOTES:
1.All pressures are listed psig and all temperatures in °F
2.Discharge temperaturesGREATERthan chartedvalues
indicate an UNDERCHARGED system.
3.Discharge temperatures LESS than charted values
indicate an OVERCHARGED system.
• This equipment’s cooling system contains refrigerant under high pressure. Always use safe and
environmentally sound methods when handling refrigerant handling or servicing the unit. Review the
factory literature and safety warnings prior to servicing.
• Whenrepairingsystemleaks,alwaysuseanitrogen(inert)gastoprotecttherefrigerantsystemandpressure
checktherepairbeforere-charging.Alwaysreplacethefilter-dryerswhenperforminganyrepairtotherefrigeration
system with one capable of acid removal.After completing the repairs, evacuate the system to 350 - 500 microns
and weigh in the refrigerant to the amount specified on the unit rating label.
• Chargingchartsarevalidforavarietyofindoor,returnairconditionsandaremostinuencedbytheoutdoor
ambient temperature, outdoor fan operation and the unit operating voltage.Before using these charts, make sure
the unit is in a stable operating mode. As shown in the charging charts (Figures 3 - 9, pages 12 - 15), the ideal
system sub-cooling can vary over the range of operation.Reference the charts to determine the ideal amount of
sub-cooling for a given liquid pressure. Units charged to other values will not perform at the rated unit efficiency
(EER) or rated Coefficient of Performance (COP) in heating mode.
• Toinspectasystemsoperationusingqualityinstruments,matchthemeasuredliquidtemperaturetotheunits
chart.The measured liquid pressure reading should be within 3% of the charts value for most installations.
• Forsystemsthatareoperatingwithmorethana5%deviation,inspecttheunitforthepropervoltageandphase
balance and the refrigeration system for leaks.
• Unitsthatareoperatingatlessthen95%ofthenominalvoltageorwitha2%phaseimbalancemayseeamore
significant deviation than the amount stated above.
• DO NOT use the charts in systems that have a fan cycling under low-ambient control. Refer to the low-ambient
kit instructions for more information. (If applicable)
LEGEND
Shaded boxes indicate flooded conditions.
Rated design values.The suction pressure
will be lower than design value if outdoor air
flow, entering dry bulb, or entering wet bulb
temperatures are lower than design.
10
Table 3. ChargingTable for S4BD-018 Series (1.5Ton Units) - Orifice Matches
Suct.
Press.
OUTDOORTEMPERATURE (°F)
70 75 80 85 90 95 100 105
Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp.
132 257 137
134 258 140 280 140
136 259 144 281 144 304 144
138 260 147 282 147 305 147 327 147
140 261 150 283 150 306 150 328 150 351 150
142 284 153 307 153 329 153 352 153 374 154
144 308 156 330 156 353 157 375 157 398 157
146 331 159 354 159 376 160 399 160 421 160
148 333 162 355 162 377 163 400 163 422 163
150 356 165 379 166 401 166 423 166
152 380 169 402 169 424 169
154 403 172 426 172
156 427 175
158
Table 4. ChargingTable for S4BD-024 Series (2Ton Units) - Orifice Matches
Suct.
Press.
OUTDOORTEMPERATURE (°F)
70 75 80 85 90 95 100 105
Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp.
125 256 136
127 257 139 280 139
129 258 143 281 143 304 143
131 259 146 282 146 305 146 328 146
133 260 150 283 150 306 150 329 150 352 150
135 284 153 307 153 330 153 353 153 376 153
137 308 157 331 156 354 157 377 157 400 157
139 333 160 355 160 378 160 401 160 424 160
141 334 163 357 163 379 163 402 164 425 164
143 358 166 381 166 403 167 426 167
145 382 169 405 170 428 170
147 406 173 429 173
149 431 176
151
Table 5. ChargingTable for S4BD-030 Series (2.5Ton Units) - Orifice Matches
Suct.
Press.
OUTDOORTEMPERATURE (°F)
70 75 80 85 90 95 100 105
Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp.
126 278 132
128 280 135 303 137
130 281 138 305 140 328 141
132 283 141 306 143 330 144 354 145
134 284 145 308 146 331 147 355 148 379 149
136 309 149 333 150 357 151 380 152 404 154
138 334 153 358 154 382 156 406 157 429 158
140 360 157 384 159 407 160 431 161 454 162
142 361 161 385 162 409 163 432 164 456 165
144 387 164 411 166 434 167 457 168
146 412 168 436 170 460 171
148 438 172 462 173
150 464 176
152
11
Table 6. ChargingTable for S4BD-036 Series (3Ton Units) - Orifice Matches
Suct.
Press.
OUTDOORTEMPERATURE (°F)
70 75 80 85 90 95 100 105
Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp.
124 261 137
126 263 141 287 140
128 265 144 288 143 312 142
130 266 147 290 146 313 146 337 145
132 268 150 292 149 315 149 339 148 362 147
134 293 153 317 152 340 152 364 151 387 150
136 318 155 342 154 365 154 389 153 413 152
138 344 158 367 157 390 157 414 156 438 155
140 345 161 369 160 392 160 416 159 439 158
142 370 163 394 163 417 162 441 162
144 396 166 419 165 442 165
146 421 168 444 168
148 446 171
150
Table 7. ChargingTable for S4BD-042 Series (3.5Ton Units) - Orifice Matches
Suct.
Press.
OUTDOORTEMPERATURE (°F)
70 75 80 85 90 95 100 105
Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp.
130 257 135
132 259 138 282 138
134 261 141 283 142 306 142
136 262 144 285 145 307 145 330 146
138 264 146 286 147 309 149 331 149 354 150
140 288 150 310 151 333 152 355 153 378 153
142 312 154 334 155 357 156 379 156 402 157
144 336 158 358 159 381 160 404 160 426 161
146 337 161 359 162 382 163 405 163 428 164
148 361 165 383 166 406 166 429 167
150 385 169 407 169 430 170
152 408 172 431 173
154 432 176
156
Table 8. ChargingTable for S4BD-048 Series (4Ton Units) - Orifice Matches
Suct.
Press.
OUTDOORTEMPERATURE (°F)
70 75 80 85 90 95 100 105
Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp.
125 261 136
127 262 140 285 140
129 263 143 286 143 309 144
131 265 146 287 147 310 147 333 148
133 266 149 289 149 311 151 334 151 357 151
135 290 152 312 153 335 154 358 155 381 155
137 314 156 336 157 359 158 382 159 405 159
139 338 160 360 161 383 162 406 163 429 163
141 339 163 361 164 384 165 407 166 430 166
143 363 167 385 168 408 169 431 170
145 387 171 409 172 432 173
147 410 175 433 176
149 434 179
151
12
Suct.
Press.
OUTDOORTEMPERATURE (°F)
70 75 80 85 90 95 100 105
Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp. Liq.
Press. Dis.
Temp.
121 264 149
123 265 153 289 153
125 267 156 290 157 313 157
127 268 159 291 160 314 161 338 161
129 270 162 293 163 316 164 339 165 362 165
131 294 166 317 167 340 168 363 169 387 169
133 319 170 342 171 365 172 388 173 411 173
135 343 174 366 175 389 176 412 177 435 178
137 345 177 368 178 391 179 414 180 437 181
139 369 181 392 182 415 183 438 184
141 394 185 417 186 440 187
143 418 189 441 190
145 442 193
147
Table 9. ChargingTable for S4BD-060 Series (5Ton Units) - Orifice Matches
250
275
300
325
350
375
400
425
450
475
500
525
550
575
600
70 75 80 85 90 95 100105 110 115 120125 130
Liquid Temperature (F)
Liquid Pressure (psig)
Remove refrigerant when above the curve
Add refrigerant when below the curve
Figure 3. Charging Chart for S4BD-018 Series (1.5Ton Units) -TXV Matches
13
Figure 4. Charging Chart for S4BD-024 Series (2Ton Units) -TXV Matches
Figure 5. Charging Chart for S4BD-030 Series (2.5Ton Units) -TXV Matches
NOTE: Do not add or remove refrigerant if pressure reading is between the curves.
SEE NOTE
250
275
300
325
350
375
400
425
450
475
500
525
550
575
600
75 80 85 90 95 100 105 110115 120 125 130
Liquid Temperature (F)
Liquid Pressure (psig)
Remove refrigerant when above the curve
Add refrigerant when below the curve
135
SEE NOTE
250
275
300
325
350
375
400
425
450
475
500
525
550
575
600
75 80 85 90 95 100 105 110115 120 125 130
Liquid Temperature (F)
Liquid Pressure (psig)
135
Add refrigerant when below the curve
Remove refrigerant when above the curve
14
250
275
300
325
350
375
400
425
450
475
500
525
550
575
600
75 80 85 90 95 100 105 110115 120 125 130
Liquid Temperature (F)
Liquid Pressure (psig)
135
Remove refrigerant when above the curve
Add refrigerant when below the curve
Figure 6. Charging Chart for S4BD-036 Series (3Ton Units) -TXV Matches
Figure 7. Charging Chart for S4BD-042 Series (3.5Ton Units) -TXV Matches
SEE NOTE
NOTE: Do not add or remove refrigerant if pressure reading is between the curves.
250
275
300
325
350
375
400
425
450
475
500
525
550
575
600
70 75 80 85 90 95 100105 110 115 120125 130
Liquid Temperature (F)
Liquid Pressure (psig)
Remove refrigerant when above the curve
Add refrigerant when below the curve
15
Figure 8. Charging Chart for S4BD-048 Series (4Ton Units) -TXV Matches
Figure 9. Charging Chart for S4BD-060 Series (5Ton Units) -TXV Matches
NOTE: Do not add or remove refrigerant if pressure reading is between the curves.
250
275
300
325
350
375
400
425
450
475
500
525
550
575
600
70 75 80 85 90 95 100105 110 115120 12
51
30
Liquid Temperature (F)
Liquid Pressure (psig)
Remove refrigerant when above the curve
Add refrigerant when below the curve
250
275
300
325
350
375
400
425
450
475
500
525
550
575
600
70 75 80 85 90 95 100105 110 115 120 125130
Liquid Temperature (F)
Liquid Pressure (psig)
Remove refrigerant when above the curve
Add refrigerant when below the curve
16
Figure 10.Wiring Diagram for S4BD Single Phase Models
(1.5, 2, 2.5, 3, 3.5, 4, & 5Ton Units)
Single Phase
1. Couper le courant avant de faire letretien.
2. Employez uniquement des conducteurs en cuivre.
3. Ne convient pas aux installations de plus de 150 volt a la terre.
710388B
(Replaces 710388A)
0109
WIRING DIAGRAM
Split System Air Conditioner (Outdoor Section)
NOTES:
1. Disconnect all power before servicing.
2. For supply connections use copper conductors only.
3. Not suitable on systems that exceed 150 volts to ground.
4. For replacement wires use conductors suitable for 105 deg C.
5. For ampacities and overcurrent protection, see unit rating plate.
6. Connect to 24 vac/40ca/class 2 circuit. See furnace/airhandler installation
instructions for control circuit and optional relay/transformer kits.
7. Anti-Short Cycle Timer (ASCT) may or may not be installed in the unit.If desired,
ASCT is factory installed on select models only or may be field installed as shown using
manufacturer’s approved kit. If not present, connectYellow and Black wires per Note 6.
FIELD WIRING
LEGEND:
LOW VOLTAGE
HIGH VOLTAGE¢710388B¤
CC - Contactor Coil
CCH - Crankcase Heater
HPS - High Pressure Switch
208/230V
CC
ASCT
ASCT
(SEE NOTE 7)
HC
F
CCH
(OPTIONAL)
R
C
S
S
C
R
L2
T2
COMPRESSOR
CONTACTS
L1
T1
COMPRESSOR
OUTDOOR FAN
MOTOR
24 VOLT FIELD
CONNECTIONS HPS
HPS
T2
T1
T3
ASCT
(SEE
NOTE 7)
GROUNDING
SCREW
L1 L2 GND
T1 T2
L1 L2
OUTDOOR
FAN MOTOR
C
S
DUAL
CAPACITOR
R
3
1
2
START
CAPAC
START
RELAY
BLACK
BLUE
ORANGE
YELLOW
CONTACTOR
YELLOW
BLACK
RED
CRANKCASE
HEATER
(OPTIONAL)
YELLOW BLACK
SEE NOTE 6
RED OR
YELLOW BLACK
RED OR
RED BLACK
BLACK OR
BLK WHT
C
S
R
YELLOW
OR
YELLOW
BLACK
RED OR
RED BLACK
H
C
F
ELECTRICAL DIAGRAMS &TABLES
17
R
T3
T1
T2
S
C
COMPRESSOR
OUTDOOR
FAN MOTOR
THREE PHASE
FIELD SUPPLY
CAPACITOR
GROUNDING
LUG
HIGH PRES.
SWITCH
CONTACTOR
T3
L1 L2 L3
GL1L2 L3
CCH
(If Equipped)
T2
T1
YELLOW/BLACK
BLUE
ORANGE
BLACK
YELLOW
RED
BLACK
esahPeerhT)noitceSroodtuO(renoitidnoCriAmetsyStilpS
WIRING DIAGRAM
NOTES:
1. Disconnect all power before servicing.
2. For supply connections use copper conductors only.
3. For replacement wires use conductors suitable for 105 deg. C.
4. For supply wire ampacities and overcurrent protection, see unit rating plate.
5. Connect to 24 vac/40 va/class 2 circuit. See furnace/air handler installation
instructions for control circuit and optional relay/transformer kits.
1. Couper le courant avant de faire letretien.
2. Employez uniquement des conducteurs en cuivre.
710688A
05/08
FIELD WIRING
LEGEND:
LOW VOLTAGE
HIGH VOLTAGE
HPS
Compressor
Contacts
L3
T3
L2
S
C
R
Capacitor
Outdoor
Fan Motor
T2
L1
CCH
(If Equipped)
T1
Compressor
CC
CC - Contactor Coil
CCH - Crankcase Heater
HPS - High Pressure Switch
24Volt Field
Connections
¢710688N¤
Figure 11.Wiring Diagram for S4BD, 3- Phase Models
(3, 4, & 5Ton Units)
18
COMFORT ALERTTROUBLESHOOTING
Table 10. LED Diagnostics
Status LED Status LED Description Status LEDTroubleshooting Information
POWER
(Green LED) Module has power Supply voltage is present at module terminals
TRIP
(Red LED)
Thermostat demand signal Y
is present, but compressor is
not running
• Compressorprotectorisopen
• Checkforhighheadpressure
• Checkcompressorsupplyvoltage
• Outdoorunitpowerdisconnectisopen
• Compressorcircuitbreakerorfuse(s)isopen
• Brokenwireorconnectorisnotmakingcontact
• Lowpressureswitchopenifpresentinsystem
• Compressorcontactorhasfailedopen
ALERT
Flash Code 1
(Yellow LED)
Long Run Time
Compressor is running
extremely long run cycles
• Lowrefrigerantcharge
• Evaporatorblowerisnotrunning
—Check blower relay coil and contacts
—Check blower motor capacitor
—Check blower motor for failure or blockage
—Check evaporator blower wiring and connectors
—Check indoor blower control board
—Check thermostat wiring for open circuit
• Evaporatorcoilisfrozen
—Check for low suction pressure
—Check for excessively low thermostat setting
—Check evaporator airflow (coil blockages or return airfilter)
—Check ductwork or registers for blockage
• Faultymeteringdevice
— CheckTXVbulbinstallation(size,locationandcontact)
—Check ifTXV/fixed orifice is stuck closed or defective
• Condensercoilisdirty
• Liquidlinerestriction(lterdrierblockedifpresentinsystem)
• Thermostatismalfunctioning
—Solenoid plug not connected
—Y2 not wired at Comfort Alert
—Check thermostat sub-base or wiring for short circuit
—Check thermostat installation (location, level)
• ComfortAlertfailure
ALERT
Flash Code 2
(Yellow LED)
System Pressure Trip
• Highheadpressure
—Check high pressure switch if present in system
—Check if system is overcharged with refrigerant
—Check for non-condensable in system
Discharge or suction • Condensercoilpooraircirculation(dirty,blocked,damaged)
Pressure out of limits
• Condenserfanisnotrunning
—Check fan capacitor
—Check fan wiring and connectors
—Check fan motor for failure or blockage
Compressor overloaded • Returnairducthassubstantialleakage
• Iflowpressureswitchpresentinsystem,checkFlashCode1information
ALERT
Flash Code 3
(Yellow LED)
Short Cycling / Compressor is
running only briefly
• Thermostatdemandsignalisintermittent
• Lowlinevoltage(contactutilityifvoltageatdisconnectislow)
• Excessiveliquidrefrigerantincompressor
• Compressorbearingsareseized
ALERT
Flash Code 4
(Yellow LED) Locked Rotor
• Runcapacitorhasfailed
• Lowlinevoltage(contactutitlityifvoltageatdisconnectislow)
• Checkwiringconnections
• Excessiveliquidrefrigerantincompressor
• Compressorbearingsareseized
• Measurecompressoroillevel
ALERT
Flash Code 5
(Yellow LED) Open Circuit
• Outdoorunitpowerdisconnectisopen
• Compressorcircuitbreakerorfuse(s)isopen
• Compressorcontactorhasfailedopen
—Check compressor contactor wiring and connectors
—Check for compressor contactor failure (burned, pitted or open)
—Check wiring and connectors between supply and compressor
—Check for low pilot voltage at compressor contactor coil
—High pressure switch is open and requires manual reset
• Opencircuitincompressorsupplywiringorconnections
• Unusuallylongcompressorprotectorresettimeduetoextremeambienttemperature
• Compressorwindingsaredamaged
—Check compressor motor winding resistance
19
COMFORT ALERTTROUBLESHOOTING - CONTINUED
Table 10. LED Diagnostics - Continued
Status LED Status LED Description Status LEDTroubleshooting Information
ALERT
Flash Code 6
(Yellow LED)
Open Start Circuit
Current only in run
circuit
• Runcapacitorhasfailed
• Opencircuitincompressorstartwiringorconnections
—Check wiring and connectors between supply and the compressor S
terminal
• Compressorstartwindingisdamaged
—Check compressor motor winding resistance
ALERT
Flash Code 7
(Yellow LED)
Open run circuit
Current only in start
circuit
• Opencircuitincompressorrunwiringorconnections
—Check wiring and connectors between supply and the compressor R
terminal
• Compressorrunwindingisdamaged
—Check compressor motor winding resistance
ALERT
Flash Code 8
(Yellow LED)
Welded Contactor
Compressor always runs • Compressorcontactorhasfailedclosed
• Thermostatdemandsignalnotconnectedtomodule
ALERT
Flash Code 9
(Yellow LED)
Low Voltage
Control circuit < 17VAC
• Controlcircuittransformerisoverloaded
• Lowlinevoltage(contactutilityifvoltageatdisconnectislow)
• Checkwiringconnections
* Flash code number corresponds to a number of LED flashes, followed by a pause and then repeated.Trip and alert LED’s
flashing at same time means control circuit voltage is too low for operation.
Table 11. Module WiringTroubleshooting
Miswired Module Indication RecommendedTroubleshooting Action
Green LED is not on, module does not power up • DetermineifbothR& Cmodule terminals are connected.
• Verifyvoltageispresentatmodule’sR& Cterminals.
Green LED intermittent, module powers up only when
compressor runs • DetermineifR& Yterminals are wired in reverse.
• VerifymodulesR&Cterminalshaveaconstantsource.
Trip LED is on, but system and compressor check OK
• VerifyYterminal is connected to 24VAC at contactor coil.
• Verifyvoltageatcontactorcoilfallsbelow0.5VACwhenoff.
• Verify24VACispresentacrossY& Cwhen thermostat demand signal is
preset. If not, R& Care reversed wired.
TRIP LED & ALERT LED flashing together • VerifyR& Cterminals are supplied with 19 - 28VAC.
ALERT Flash CODE 3 displayed incorrectly
(Compressor short cycling) • VerifyYterminal is connected to 24VAC at contactor coil.
• Verifyvoltageatcontactorcoilfallsbelow0.5VACwhenoff.
ALERT Flash Code 5, 6, or 7 displayed incorrectly
(Open Circuit, Open Start Circuit or Open Run Circuit)
• Verifythecompressorrunandstartwiresareroutedthroughthemodule’s
current sensing holes.
• VerifytheYterminal is connected to 24VAC at contactor coil.
• Verifyvoltageatcontactorcoilfallsbelow0.5VACwhenoff.
ALERT Flash Code 6 (Open Start Circuit) displayed for
Code 7 (Open Run Circuit) or vice-versa • Verifythecompressorrunandstartwiresareroutedthroughthecorrect
module sensing holes.
ALERT Flash Code 8 displayed incorrectly (Welded
Contactor)
• Determineifmodule’sYterminal is connected.
• VerifyYterminal is connected to 24VAC at contactor coil.
• Verify24VACispresentacrossY& Cwhen thermostat demand signal is
present. If not, R& Care reversed wired.
• Verifyvoltageatcontactorcoilfallsbelow0.5VACwhenoff.
• ReviewThermostatDemandWiring(page10)forY& Cwiring.
INSTALLATION / PERFORMANCE CHECK LIST
ELECTRICAL SYSTEM:
Electrical connections tight? YES NO
Line voltage polarity correct? YES NO
Rated Voltage:___________________________________ VOLTS
L1-L2 Volts: _____________________________________ VOLTS
L1-L3 Volts: _____________________________________ VOLTS
L2-L3 Volts: _____________________________________ VOLTS
Avg.Volts: ______________________________________ VOLTS
Max. deviation of voltage
from avg. volts:___________________________________VOLTS
% Volt imbalance: ________________________________ VOLTS
Blower Motor HP:________ Sheave Setting ___________# Turns
Has the thermostat been calibrated? YES NO
Is the thermostat level? YES NO
Istheheatanticipator settingcorrect?
(If Applicable) YES NO
709292A (Replaces 7092920)
Specifications & illustrations subject to change without notice or incurring obligations.
O’Fallon, MO | Printed in U.S.A.(02/12)
INSTALLATION ADDRESS:
CITY ________________________ STATE ________________
UNIT MODEL # ________________________________________
UNIT SERIAL # _______________________________________
UnitInstalledMinimumclearancesper
Figure 1 (page 3)? YES NO
INSTALLER NAME:
CITY _______________________ STATE ________________
REFRIGERATION SYSTEM:
Was unit given 24 hr warm up period
for crankcase heaters? YES NO
Stage-1 Liquid Pressure (high side) ________________________
Stage-1 Suction Pressure (low side)________________________
Has the owner’s information been
reviewed with the customer? YES NO
Has the Literature Package been left
with the unit? YES NO
REPLACEMENT PARTS
ReplacementpartsareavailablethroughallNordynedistributors.
Please have the complete model and serial number of the unit
when ordering replacement parts.
Electrical:
Capacitors Temperature Limit Switches
Compressors Thermostats
Contactors Time Delay Relays
Pressure Switches Transformers
Relays
Motors:
Blower Motor
Fan Motor
Components:
Blower Assembly Fan Grille
Cabinet Panels Filter/Driers
Expansion Valves
This manual suits for next models
11
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