Nortek S4BF-048 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..................................................5
Grounding .............................................................6
Thermostat Connections.......................................6
STARTUP & ADJUSTMENTS ...............................7
Pre - Start Checklist..............................................7
Start-up Procedures..............................................7
Air Circulation - Indoor Blower ..............................7
System Cooling.....................................................7
System Heating.....................................................7
AIR CONDITIONER MAINTENANCE....................7
COMPONENT FUNCTIONS..................................8
REFRIGERANT CHARGING.................................8
Charging the Unit in AC Mode with
Outdoor Temperatures Above 55° F......................8
Application Notes for Using the Charging Chart ...9
ELECTRICAL DIAGRAMS &TABLES................ 10
Figure 6. S4BF-024 .......................................... 10
Figure 7. S4BF-024 (w/ Comfort Alert) ............. 11
Figure 8. S4BF-036 .......................................... 12
Figure 9. S4BF-036 (w/ Comfort Alert) ............. 13
Figure 10. S4BF-048 & 060 ............................. 14
Figure 11. S4BF-048 & 060 (w/ Comf. Alert)..... 15
Table 3. Comfort Alert LED Diagnostics............ 16
Table 4. Module Wiring Troubleshooting............ 17
INSTALL. / PERFORMANCE CHECKLIST......... 20
REPLACEMENT PARTS...................................... 20
S4BF - 024, 036, 048, & 060 (2, 3, 4, & 5Ton) Series
16 SEER, SINGLE PHASE MODELS
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
tostrictsafetyguidelines andinstructingthe
customeronhowtooperateandmaintainthe
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
attentiontoallsafetywarningsandanyother
special notes highlighted in the manual.
Improperinstallation ofthefurnaceorfailure
to follow safety warnings could result in
serious injury, death, or property damage.
These instructions are primarily intended to
assistqualifiedindividualsexperiencedinthe
proper installation of this appliance. Some
local codes require licensed installation/
service personnelforthis typeof equipment.
Please read all instructions carefully before
starting the installation. Return these
instructions to the customer’s package for
future reference.
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
theseinstructions.Consult local buildingcodesandthe
NationalElectricalCode(ANSICI)forspecialinstallation
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
qualified trained personnel thoroughly familiar with this
type equipment.
• Fullyannealed,refrigerantgradecoppertubingshould
beusedwheninstallingthesystem.Refrigerantsuction
line tubing should be fully insulated.
• Installationofequipmentmayrequirebrazingoperations.
Installer must comply with safety codes and wear
appropriate safety equipment (safety glasses, work
gloves,reextinguisher,etc.)whenperformingbrazing
operations.
• Follow all precautions in the literature, on tags, 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:
S4BFSplitSystemAirConditionersareshipped
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 R-410A refrigerant. DO NOT use
any other refrigerant in this unit.Use of another
refrigerant will damage the unit.
3
AIR CONDITIONER INSTALLATION
General Information
The S4BF 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
√The cooling load of the area to be conditioned must be
calculatedandasystemofthepropercapacityselected.
It is recommended that the area to be conditioned be
completely insulated and vapor sealed.
√Checkthe electricalsupplyand verifythe powersupply
isadequateforunitoperation.Thesystemmustbewired
and provided with circuit protection in accordance with
localbuildingcodes.Ifthereisanyquestionconcerning
the power supply, contact the local power company.
√Theindoor section(airhandler,furnace,etc) shouldbe
installed before routing the refrigerant tubing. Refer to
the indoor unit's installation instructions for installation
details.
√Allunitsaresecurelypackedatthetimeofshipmentand
upon arrival should be carefully inspected for damage
prior to installing the equipment at the job site. Verify
coil fins are straight.If necessary, comb fins to remove
flattened or bent fins.Claims for damage (apparent or
concealed)shouldbefiled immediatelywith the carrier.
√Pleaseconsultyourdealerformaintenanceinformation
and availability of maintenance contracts.Please read
all instructions before installing the unit.
Locating the Air Conditioner
• Surveythejobsitetodeterminethebestlocationfor
mounting the outdoor unit.
• Theoutdoorunitshouldbeinstallednocloserthan18
inchesfromtheoutsidewallsofthefacilityandinanarea
free from overhead obstructions to ensure unrestricted
airflow through the outdoor unit.
• Sufcientclearanceforunobstructedairowthroughthe
outdoorcoilmustbemaintainedinordertoachieverated
performance.See Figure 1 for minimum clearances to
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
must be level and strong enough to support the weight
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"abovethe
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 the
jointsduringbrazingtopreventinternaloxidationand
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.
• Refrigeranttubingshould be supported in amanner
that the tubing will not vibrate or abrade during system
operation.
• Tubing shouldbekeptcleanofforeigndebrisduring
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.
• Themaximumrecommendedinterconnectingrefrigerant
linelengthsis75ft.andtheverticalelevationdifference
between the indoor and outdoor sections should not
exceed 20 ft.
• A lter dryer is provided with the unit and must be
installedintheliquidlineofthesystem.Iftheinstallation
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).
• For Canadian installations the electrical connections
and grounding shall comply with the current Canadian
Electrical Code (CSA C22.1 and/or local codes).
Pre-Electrical Checklist
√Verify that the voltage, frequency, and phase of the
supplysourcematchthespecificationsontheunitrating
plate.
√Verifythatthe serviceprovidedbytheutility is sufficient
tohandletheadditionalloadimposedbythisequipment.
Refer to the unit wiring label for proper voltage wiring.
√Verifyfactorywiringisinaccordancewiththeunitwiring
diagram (Figures 6 - 11, pages 10 - 15). Inspect for
loose connections.
LineVoltage
• Awiringdiagramislocatedontheinsidecoverofthe
electrical box of the outdoor unit.The installer should
become familiar with the wiring diagram before making
any electrical connections to the outdoor unit.
• Anelectricaldisconnectmustbelocatedwithinsight
ofandreadilyaccessibletothe unit.Thisswitchshall
becapableofelectricallyde-energizingtheoutdoorunit.
• 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.
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
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.
• Optionalequipmentsuchasliquidlinesolenoidvalves,
lowambient,etc.,shouldbeinstalledinstrictaccordance
with the manufacturer’s installation instructions.
5
• Theoutdoorunitrequiresbothpowerandcontrolcircuit
electrical connections. Refer to the wiring diagram /
schematic for identification and location of outdoor unit
field wiring interfaces (Figures 6 - 11, pages 10 - 15).
Make all electrical connections in accordance with all
applicable codes and ordinances.
• 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
the line-voltage leads to the terminals on the contactor
inside the control compartment.
• Useonlycopperwireforthelinevoltagepowersupply
to this unit as listed inTable 1.Use proper code agency
listed conduit and a conduit connector for connecting
the supply wires to the unit.Use of rain tight conduit is
recommended.
• 208/230Voltunitsareshippedfromthefactorywired
for 230 volt operation.For 208V operation, remove the
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.
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.
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.
Figure 2. Comfort AlertTM Diagnostics Module
POWER LED
(Green)
TRIP LED
(Red)
ALERT LED
(Yellow)
Diagnostics
Key
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
demandsignalwiring.Alwaysfollowmanufacturerwiring
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
until the condition returns to normal or if 24 VAC power
is removed from the module. See Table 3 (page 16) for
flash code identification or Table 4 (page 17) 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:TheALERTLED willflash consecutively,pause
andthenrepeattheprocess.Thenumberofconsecutive
6
flashes, referred to as the Flash Code, correlates to a
particular abnormal condition.Detailed descriptions of
these ALERT Flash Codes are listed in Tables 3 & 4.
• 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.
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.
Thermostat Connections
• Thermostatconnectionsshouldbemadeinaccordance
withtheinstructionssuppliedwiththethermostatandthe
indoor equipment.Typical AC and thermostat hookups
are shown in Figures 3 & 4.
• The outdoor unit is designed to operate from a 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
theflooronaninsidewall.DONOTinstallthethermostat
on an outside wall or any other location where its
operationmaybeadverselyaffectedbyradiantheatfrom
fireplaces, sunlight, or lighting fixtures, and convective
heat from warm air registers or electrical appliances.
Refertothethermostatmanufacturer’sinstructionsheet
for detailed mounting and installation 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
NOTE: FOR THE MATCH
*S4BF-024KA + C6B(A,H)-X30(C,U)-C + *G7T-C
*S4BF-024KA + C6B(A,H)-X30(C,U)-C + *G7S-C+*SHE
Only connect Y2 from thermostat to OD Y2
Furnace
Air Conditioner
OD Section
(No Comfort Alert)
W2
W1
Y/Y2
G
R
C
Thermostat
O Y2 Y G RC RH C W2 W/E
Y1
Y/Y2
C
Y1
Only connect Y2 from thermostat to OD Y2
Furnace
Air Conditioner
OD Section
(Comfort Alert)
W2
W1
Y/Y2
G
R
C
Thermostat
OY2 Y G RC RH C W2 W/E
Y1
Y/Y2
G
R
C
O
Y1
NOTE: FOR THE MATCH
*S4BF-024KA + C6B(A,H)-X30(C,U)-C + *G7T-C
*S4BF-024KA + C6B(A,H)-X30(C,U)-C + *G7S-C+*SHE
Figure 3.Typical 2-Stage Air Conditioner
(with Comfort Alert) with Gas Furnace
Figure 4.Typical 2-Stage Air Conditioner
(without Comfort Alert) with Gas Furnace
7
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.
√Verify line voltage power leads are securely connected
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.
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
temperaturesetpointbelowroomtemperatureandverify
theoutdoorunitandindoorblowerenergize.
2.Verify blower wheel is spinning in direction indicated by
arrow.Feel the air being circulated by the indoor blower
and verify that it is cooler than ambient temperature.
Listen for any unusual noises.If unusual sounds occur,
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:The blower should also stop 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.If unusualsounds occur, determine the
source of the noise and correct as necessary.
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
beginning of each cooling season.Remove any debris.
Clean the outdoor coil and louvers as necessary using
amilddetergentandwater.Rinsethoroughlywithwater.
• Inspecttheelectricalconnectionsfortightnessatthe
beginningofeach heatingand coolingseason.Service
as necessary.
CAUTION:
The unit should never be operated without a
filterinthereturnairsystem.Replacedisposable
filters with the same type and size.
• Donotattempttoaddadditionaloiltomotorsunequipped
with oil tubes.The compressor is hermetically sealed
at the factory and does not require lubrication.
8
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
theswitchopensand then closes,therewillbea 5 minute
shortcyclingdelaybeforetheoutdoorunitwillenergize.
REFRIGERANT CHARGING
WARNING:
S4BFSplitSystemAirConditionersareshipped
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
matchedassembliesofNORDYNEequipmentandlisted
airflows for the indoor coil.Refer to Figure 5 (page 11)
for correct system charging.
• S4BFoutdoorunitswithnon-AHRIlistedindoorcoils
arenotrecommended.Deviationsfromratedairflowsor
non-listedcombinationsmayrequiremodificationtothe
expansion device and refrigerant charging procedures
for proper and efficient system operation.
• Therefrigerantchargecanbecheckedandadjusted
throughtheserviceportsprovidedexternaltotheoutdoor
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 tempera-
tures above 55° F for optimized sub-cooling of 10°
F - 12° F.
1.Withthesystemoperatingatsteady-state,measurethe
liquid refrigerant pressure (in psig) at the outdoor unit
service valve.
2.Measuretheliquidrefrigeranttemperature(inFahrenheit)
at the service valve.
3.Determine the required liquid refrigerant pressure from
the appropriate charging chart (Figure 5).
•IfthepressuremeasuredinStep1isgreaterthan
therequiredliquidrefrigerantpressuredeterminedin
Step3,thenthere istoomuchchargeinthesystem.
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.
9
Application Notes on the Use of Charging Charts
• This equipment’s cooling system contains
refrigerant under high pressure. Always use safe
andenvironmentallysoundmethodswhenhandling
refrigerant handling or servicing the unit. Review
the factory literature and safety warnings prior to
servicing.
• Whenrepairingsystemleaks,alwaysuseanitrogen
(inert)gastoprotecttherefrigerantsystemandpressure
check the repair before re-charging. Always replace
the filter-dryers when performing any repair to the
refrigeration 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,return
air conditions and are most influenced by the outdoor
ambienttemperature,outdoorfanoperationandtheunit
operatingvoltage.Beforeusingthesecharts,makesure
the unit is in a stable operating mode.As shown in the
Figure 5. Charging Chart for 2-5Ton Units
200
250
300
350
400
450
500
550
75 85 95 105115 12
51
35
Liquid Pressure (psig)
Liquid Temperature (F)
16 SEER AC MC Charging Chart
Add refrigerant if
below the curve.
Remove refrigerant
if above the curve.
Do not add or remove refrigerant if
pressure reading is between unit
curves and saturation curve.
2 - 4 TON MODELS
5 TON MODELS
R-410A SATURATION
charging chart (Figure 5), the ideal system sub-cooling
can vary over the range of operation. Reference the
chartstodeterminetheidealamountofsub-coolingfora
givenliquid pressure.Units charged toother valueswill
not perform at the rated unit efficiency (EER) or rated
Coefficient of Performance (COP) in heating mode.
• Toinspectasystemsoperationusingqualityinstruments,
match the measured liquid temperature to the units
chart.The measured liquid pressure reading should be
within 3% of the charts value for most installations.
• Forsystemsthatareoperatingwithmorethana5%
deviation, inspect the unit for the proper voltage and
phase balance and the refrigeration system for leaks.
• Unitsthatareoperatingatlessthen95%ofthenominal
voltage or with a 2% phase imbalance may see a more
significant deviation than the amount stated above.
• DONOTusethechartsinsystemsthathaveafancycling
under low-ambient control.Refer to the low-ambient kit
instructions for more information. (If applicable)
10
ELECTRICAL DIAGRAMS &TABLES
YELLOW/
BLACK
Y2 CY
R
S
C
CONTACTOR
HIGH PRESSURE
SWITCH LOW PRESSURE
SWITCH
OUTDOOR
FAN MOTOR
COMPRESSOR
FIELD SUPPLY
YELLOW/
BLACK YELLOW
YELLOW
GRND L1 L2
SINGLE PHASE
FIELD SUPPLY
GROUNDING
SCREW
BLACK
BLUE
YELLOW
BLACK
BLACK
BLACK
RED
ORANGE
C
S
R
CCH
HC F
L1 L2
T1 T2 LFT
RT
CAPACITOR
C
TERMINAL
BLOCK D
208/230V
Two Stage Split System Air Conditioner (Outdoor Section)
With Single Speed Fan Motor Single Phase / 60 Hz.
WIRING DIAGRAM
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
5. For ampacities and overcurrent protection, see unit rating plate.
6. Connect to 24 vac/40va/class 2 circuit. See furnace/airhandler 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.
3. Ne convient pas aux installations
de plus de 150 volt a la terre.
7110140
1209
FIELD WIRING
LEGEND:
LOW VOLTAGE
HIGH VOLTAGE
YELLOW
YELLOW
BLACK
BLUE
YELLOW
BLACK
208/230V
H
C
F
CCH
R
C
S
S
C
R
L2
T2
COMPRESSOR
CONTACTS
L1
T1
COMPRESSOR
OUTDOOR FAN
MOTOR
CSC
C
Y2
Y
LPS
HPS
COMPRESSOR
SOLENOID COIL
24 VOLT FIELD
CONNECTIONS
CC- Contactor Coil
CCH - Crankcase Heater
LPS - Low Pressure Switch
HPS - High Pressure Switch
CSC - Compressor Solenoid Coil
CC
°C
CAPACITOR
¢711014e¤
Figure 6.Wiring Diagram for S4BF-024 (2Ton) Series
11
YELLOW/
BLACK
Y2
Y
L
R
C
DC SOL
COMFORT
ALERT MODULE
Y2 RCLY
R
S
C
CONTACTOR
HIGH PRESSURE
SWITCH LOW PRESSURE
SWITCH
OUTDOOR
FAN MOTOR
COMPRESSOR
FIELD SUPPLY
YELLOW/
BLACKYELLOW
YELLOW
GRNDL1 L2
SINGLE PHASE
FIELD SUPPLY
GROUNDING
SCREW
BLACK
BLUE
YELLOW
BLACK
BLACK
BLACK
RED
ORANGE
C
S
R
CCH
HC F
L1 L2
T1 T2 LFT
RT
ROUTE THIS WIRE THROUGH “C” OPENING
IN COMFORT ALERT MODULE
ROUTE THIS WIRE THROUGH
“S” OPENING IN
COMFORT ALERT MODULE
ROUTE THIS WIRE THROUGH “R”
OPENING IN COMFORT ALERT MODULE
CAPACITOR
208/230V
Two Stage Split System Air Conditioner (Outdoor Section)
With Single Speed Fan Motor Single Phase / 60 Hz.
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
5. For ampacities and overcurrent protection, see unit rating plate.
6. Connect to 24 vac/40va/class 2 circuit. See furnace/airhandler installation
instructions for control circuit and optional relay/transformer kits.
7. Couper le courant avant
de faire letretien.
8. Employez uniquement des
conducteurs en cuivre.
9. Ne convient pas aux installations
de plus de 150 volt a la terre.
7108080
0408
FIELD WIRING
LEGEND:
LOW VOLTAGE
HIGH VOLTAGE
YELLOW
YELLOW
BLACK
RED
BLUE
YELLOW
BLACK
208/230V
H
C
F
CCH
R
C
S
S
C
R
L2
T2
COMPRESSOR
CONTACTS
L1
T1
COMPRESSOR
OUTDOOR FAN
MOTOR
Y2YLRC
DC
SOL
CSC
L
C
R
Y2
Y
LPS
HPS
COMFORT ALERT
COMPRESSOR
SOLENOID COIL
24 VOLT FIELD
CONNECTIONS
CC- Contactor Coil
CCH - Crankcase Heater
LPS - Low Pressure Switch
HPS - High Pressure Switch
CSC - Compressor Solenoid Coil
CC
°C
CAPACITOR
Module has power
Status LED
Green “POWER”
Yellow “ALERT” Flash Code 1
Red “TRIP”
Yellow “ALERT” Flash Code 2
Yellow “ALERT” Flash Code 3
Thermostat demand signal Y is present,but the compressor is not running
Yellow “ALERT” Flash Code 4
Yellow “ALERT” Flash Code 5
Yellow “ALERT” Flash Code 6
Yellow “ALERT” Flash Code 7
Yellow “ALERT” Flash Code 8
Status LED Description
LONG RUNTIME - Compressor is running extremely long run cycle
SYSTEM PRESSURETRIP - Discharge or suction pressure out of limits
or compressor overloaded
SHORT CYCLING - Compressor is running only briefly
LOCKED ROTOR
OPEN CIRCUIT
OPEN START CIRCUIT - Current only in run circuit
WELDED CONTACTOR - Compressor always runs
Yellow “ALERT” Flash Code 9
OPEN RUN CIRCUIT - Current only in start circuit
LOW VOLTAGE- Control circuit < 17 VAC
¢710808.¤
WIRING DIAGRAM
Figure 7.Wiring Diagram for S4BF-024 (2Ton) Series
with Comfort Alert
12
YELLOW/
BLACK
Y2 CY
L1 L2
T1 T2
CONTACTOR
HIGH PRESSURE
SWITCH LOW PRESSURE
SWITCH
OUTDOOR
FAN MOTOR
COMPRESSOR
TO THERMOSTAT
YELLOW/
BLACKYELLOW
YELLOW
GRND L1 L2
SINGLE PHASE
FIELD SUPPLY
GROUNDING
SCREW
BLUE
YELLOW
BLACK
BLACK
BLACK
RED
ORANGE
C
S
R
CCH
HC F
L
S
C
RED
BLACK
HCOMNO
FAN
RELAY
NC
LFT
RT
CAPACITOR
BLACK
BLACK
C
D
TERMINAL
BLOCK
BLUE
YELLOW
CC- Contactor Coil
CCH - Crankcase Heater
LPS - Low Pressure Switch
HPS - High Pressure Switch
CSC - Compressor Solenoid Coil
OFR - Outdoor Fan Relay Coil
CSC
C
Y2
Y
LPS
HPS
COMPRESSOR
SOLENOID COIL
24 VOLT FIELD
CONNECTIONS
208/230VTwo Stage Split Air Conditioner (Outdoor Section)
WithTwo Speed Outdoor Fan Motor Single Phase / 60 Hz.
WIRING DIAGRAM
7110150
1209
FIELD WIRING
LEGEND:
LOW VOLTAGE
HIGH VOLTAGE
BLACK
BLUE
YELLOW
BLUE
BLACK
208/230V
H
C
F
CCH
R
C
S
S
C
H
L2
T2
COMPRESSOR
CONTACTS
L1
T1
COMPRESSOR
FAN MOTOR
L
FAN RELAY
CC
OFR
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
5. For ampacities and overcurrent protection, see unit rating plate.
6. Connect to 24 vac/40va/class 2 circuit. See furnace/airhandler 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.
3. Ne convient pas aux installations
de plus de 150 volt a la terre.
CAPACITOR
¢711015k¤
Figure 8.Wiring Diagram for S4BF-036 (3Ton) Series
13
YELLOW/
BLACK
Y2
Y
L
R
C
DC SOL
COMFORT
ALERT MODULE
Y2 RCLY
L1 L2
T1 T2
CONTACTOR
HIGH PRESSURE
SWITCH LOW PRESSURE
SWITCH
OUTDOOR
FAN MOTOR
COMPRESSOR
TO THERMOSTAT
YELLOW/
BLACK YELLOW
YELLOW
GRNDL1 L2
SINGLE PHASE
FIELD SUPPLY
GROUNDING
SCREW
BLUE
YELLOW
BLACK
BLACK
BLACK
RED
ORANGE
C
S
R
CCH
HC F
L
S
C
RED
BLACK
HCOMNO
FAN
RELAY
NC
LFT
RT
ROUTE THIS WIRE THROUGH “C” OPENING
IN COMFORT ALERT MODULE
ROUTHE THIS WIRE THROUGH “S”
OPENING IN COMFORT ALERT MODULE
CAPACITOR
BLACK
BLACK
ROUTE THIS WIRE THROUGH “R”
OPENING IN COMFORT ALERT MODULE
YELLOW
CC- Contactor Coil
CCH - Crankcase Heater
LPS - Low Pressure Switch
HPS - High Pressure Switch
CSC - Compressor Solenoid Coil
OFR - Outdoor Fan Relay Coil
Y2YLRC
DC
SOL
CSC
L
C
R
Y2
Y
LPS
HPS
COMFORT ALERT
COMPRESSOR
SOLENOID COIL
24 VOLT FIELD
CONNECTIONS
208/230VTwo Stage Split Air Conditioner (Outdoor Section)
WithTwo Speed Outdoor Fan Motor Single Phase / 60 Hz.
7108090
0408
FIELD WIRING
LEGEND:
LOW VOLTAGE
HIGH VOLTAGE
YELLOW
BLACK
RED
BLUE
YELLOW
BLUE
BLACK
208/230V
H
C
F
CCH
R
C
S
S
C
H
L2
T2
COMPRESSOR
CONTACTS
L1
T1
COMPRESSOR
FAN MOTOR
L
FAN RELAY
CC
OFR
Module has power
Status LED
Green “POWER”
Yellow “ALERT” Flash Code 1
Red “TRIP”
Yellow “ALERT” Flash Code 2
Yellow “ALERT” Flash Code 3
Thermostat demand signal Y is present,but the compressor is not running
Yellow “ALERT” Flash Code 4
Yellow “ALERT” Flash Code 5
Yellow “ALERT” Flash Code 6
Yellow “ALERT” Flash Code 7
Yellow “ALERT” Flash Code 8
Status LED Description
LONG RUNTIME - Compressor is running extremely long run cycle
SYSTEM PRESSURETRIP - Discharge or suction pressure out of limits
or compressor overloaded
SHORT CYCLING - Compressor is running only briefly
LOCKED ROTOR
OPEN CIRCUIT
OPEN START CIRCUIT - Current only in run circuit
WELDED CONTACTOR - Compressor always runs
Yellow “ALERT” Flash Code 9
OPEN RUN CIRCUIT - Current only in start circuit
LOWVOLTAGE - Control circuit < 17 VAC
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
5. For ampacities and overcurrent protection, see unit rating plate.
6. Connect to 24 vac/40va/class 2 circuit. See furnace/airhandler installation
instructions for control circuit and optional relay/transformer kits.
7. Couper le courant avant
de faire letretien.
8. Employez uniquement des
conducteurs en cuivre.
9. Ne convient pas aux installations
de plus de 150 volt a la terre.
¢7108094¤
CAPACITOR
WIRING DIAGRAM
Figure 9.Wiring Diagram for S4BF-036 (3Ton) Series
with Comfort Alert
14
Figure 10.Wiring Diagram for S4BF-048 & S4BF-060 (4 & 5Ton) Series
YELLOW/
BLACK YELLOW/
BLACK YELLOW
YELLOW
BROWN
BLACK
BLUE
BLACK
YELLOW
BLACK
COMPRESSOR
CONTACTOR
OUTDOOR
FAN MOTOR
HIGH PRESSURE
SWITCH LOW PRESSURE
SWITCH
CCH
S
C
R
HC
Y2 CY
L1 L2
T2T1
TO THERMOSTAT
LEFT
RIGHT
YELLOW
GRN L1 L2
SINGLE PHASE
FIELD SUPPLY
ECM
Y2 L2
C
L1
Y1
RED
BLACKCAPACITOR
WHITE
CTERMINAL
BLOCK
D
WIRING DIAGRAM
7110130
1209
FIELD WIRING
LEGEND:
LOW VOLTAGE
HIGH VOLTAGE
YELLOW
BLACK
YELLOW
BLUE
YELLOW
CC- CONTACTOR COIL
CCH - CRANKCASE HEATER
LPS - LOW PRESSURE SWITCH
HPS - HIGH PRESSURE SWITCH
CSC - COMPRESSOR SOLENOID COIL
208/230V
H
C
CCH
R
C
S
L2
T2
COMPRESSOR
CONTACTS
L1
T1
COMPRESSOR
CSC
C
Y2
Y
LPSHPS
COMPRESSOR
SOLENOID COIL
24 VOLT FIELD
CONNECTIONS
CC
208/230V
Two Stage Split System Air Conditioner (Outdoor Section)
With ECM Outdoor Motor Single Phase / 60 Hz.
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
5. For ampacities and overcurrent protection, see unit rating plate.
6. Connect to 24 vac/40va/class 2 circuit. See furnace/airhandler 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.
3. Ne convient pas aux installations
de plus de 150 volt a la terre.
°C
OUTDOOR
FAN MOTOR
CAPACITOR
Y1
C
Y2
ECM L2
L1
¢711013_¤
15
YELLOW/
BLACK YELLOW/
BLACK YELLOW
YELLOW
BROWN
BLACK
BLUE
BLACK
YELLOW
BLACK
Y2
Y
L
R
C
DC SOL
COMPRESSOR
ECM
CONTACTOR
OUTDOOR
FAN MOTOR
COMFORT
ALERT MODULE
HIGH PRESSURE
SWITCH LOW PRESSURE
SWITCH
CCH
S
C
R
HC
Y2 RCLY
L1 L2
T2T1
TO THERMOSTAT
LEFT
RIGHT
YELLOW
GRN L1 L2
SINGLE PHASE
FIELD SUPPLY
ROUTE THIS WIRE THROUGH “R” OPENING
IN COMFORT ALERT MODULE
ROUTE THIS WIRE THROUGH “S”
OPENING IN COMFORT ALERT MODULE
ROUTE THIS WIRE THROUGH “C” OPENING
IN COMFORT ALERT MODULE
Y2 L2
C
L1
Y1
RED
BLACK CAPACITOR
WHITE
¢710770«¤
WIRING DIAGRAM
7107700
0408
FIELD WIRING
LEGEND:
LOW VOLTAGE
HIGH VOLTAGE
YELLOW
BLACK
YELLOW
BLACK
BLUE
RED
YELLOW
CC- CONTACTOR COIL
CCH - CRANKCASE HEATER
LPS - LOW PRESSURE SWITCH
HPS - HIGH PRESSURE SWITCH
CSC - COMPRESSOR SOLENOID COIL
208/230V
HC
CCH
R
C
S
L2
T2
COMPRESSOR
CONTACTS
L1
T1
COMPRESSOR
Y2YLRC
DC
SOL
CSC
L
C
R
Y2
Y
LPSHPS
COMFORT ALERT
COMPRESSOR
SOLENOID COIL
24 VOLT FIELD
CONNECTIONS
CC
208/230V
Two Stage Split System Air Conditioner (Outdoor Section)
With ECM Outdoor Motor Single Phase / 60 Hz.
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
5. For ampacities and overcurrent protection, see unit rating plate.
6. Connect to 24 vac/40va/class 2 circuit. See furnace/airhandler installation
instructions for control circuit and optional relay/transformer kits.
7. Couper le courant avant
de faire letretien.
8. Employez uniquement des
conducteurs en cuivre.
9. Ne convient pas aux installations
de plus de 150 volt a la terre.
°C
Module has power
Status LED
Green “POWER”
Yellow “ALERT” Flash Code 1
Red “TRIP”
Yellow “ALERT” Flash Code 2
Yellow “ALERT” Flash Code 3
Thermostat demand signal Y is present,but the compressor is not running
Yellow “ALERT” Flash Code 4
Yellow “ALERT” Flash Code 5
Yellow “ALERT” Flash Code 6
Yellow “ALERT” Flash Code 7
Yellow “ALERT” Flash Code 8
Status LED Description
LONG RUNTIME - Compressor is running extremely long run cycle
SYSTEM PRESSURETRIP - Discharge or suction pressure out of limits
or compressor overloaded
SHORT CYCLING - Compressor is running only briefly
LOCKED ROTOR
OPEN CIRCUIT
OPEN START CIRCUIT - Current only in run circuit
WELDED CONTACTOR - Compressor always runs
Yellow “ALERT” Flash Code 9
OPEN RUN CIRCUIT - Current only in start circuit
LOWVOLTAGE- Control circuit < 17 VAC
OUTDOOR
FAN MOTOR
CAPACITOR
Y1
C
Y2
ECM L2
L1
Figure 11.Wiring Diagram for S4BF-048 & S4BF-060 (4 & 5Ton) Series
with Comfort Alert
16
Table 3. 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
17
Table 3. 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 4. 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.
18
19
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
Specifications & illustrations subject to change without notice or incurring obligations.
O’Fallon, MO | Printed in U.S.A.(05/12)
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
7094330 (Replaces 709129A)
This manual suits for next models
3
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