Nordyne DT4BE User manual

Split System Heat Pump
USER’S MANUAL
IMPORTANT SAFETY INFORMATION
WARNING:
To avoid possible equipment damage, fire,
or death, the following instructions must be
observed regarding unit maintenance and
operational procedures.
Please read all information in this manual thoroughly
and become familiar with the capabilities and use of your
appliance before attempting to operate or maintain this
unit. Pay attention to all safety warnings and any other
special notes highlighted in the manual. Safety markings
areusedfrequentlythroughoutthismanualtodesignatea
degreeorlevelofseriousnessandshouldnotbeignored.
WARNING indicates a potentially hazardous situation
thatifnotavoided,couldresultinpersonalinjuryordeath.
CAUTIONindicatesapotentiallyhazardoussituationthat
if not avoided, may result in minor or moderate injury or
property damage.
Keep this literature where you have easy access to it in
thefuture.Ifaproblemoccurs,checktheinstructionsand
followrecommendationsgiven.Ifthesesuggestionsdon’t
eliminateyourproblem,call yourservicingcontractor.Do
not attempt to service this unit yourself!
• Undernocircumstancesshouldtheapplianceownerattempttoinstalland/orservicethis
equipment. Some local codes require licensed installation / service personnel for this
type of equipment. Improper service, adjustment, or maintenance may cause explosion,
fire, electrical shock or other hazardous conditions which may result in personal injury or
property damage.
• Readtheseinstructionsthoroughlybeforeusingtheequipment.Followallprecautionsand
warnings contained within these instructions and on the unit.
• Improper installation, adjustment, alteration, service, or maintenance can cause personal
injury or property damage. Refer to this manual. For assistance or additional information,
consult a qualified installer or service agency.
• Donotstoreorusegasolineorotherammablevaporsandliquidsinthevicinityofthisor
any other appliance.
DONOTDESTROY.PLEASEREADCAREFULLYANDKEEPINASAFEPLACEFORFUTUREREFERENCE.
WARNING:
!
• To achieve optimum performance and minimize
equipment 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. Please
consult your dealer for maintenance information and
availability of maintenance contracts.
• Theareaaroundthecoolingunitamustbekeptclear
and free of combustible materials, gasoline, and other
flammable vapors and liquids. Do not store or use
flammable items such as paint, varnish, or strippers
in the vicinity of the unit.
• Donotusetheareaaroundtheunitasastoragearea.
Thisarea must be keptclean and clearoflooseor
exposed insulation materials.Examine the unit’s area
when it is installed or when insulation is added, since
some insulation materials may be combustible.
• Donotusethisapplianceifanyparthasbeenunder
water.Immediately call a qualified service technician to
inspect the unit and to replace any part of the control
system and any gas control which has been under
water.
• Familiarizeyourselfwiththecontrolsthatshutoffthe
electrical power to the unit.If the unit needs to be shut
down for an extended period of time, turn off electrical
poweratthecircuitbreaker.Foryoursafetyalwaysturn
off the electrical power before performing service or
maintenance on the unit

2
Figure1.DigitalThermostat
Fan
Mode Temperature
Selector
System
Mode
ABOUTTHE HEAT PUMP
Your heat pump is a unique, all weather comfort-control
appliance that will heat and cool your home year round
and provide energy saving comfort. It’s an unknown fact
that heat is always in the air, even when the outside
temperatureisbelowfreezing.Theheatpumpusesthis
basiclawofphysicsto provideenergy savingheat during
thewintermonths.Forexample,Iftheoutdoortemperature
is47°F(8°C),yourheatpumpcandeliverapproximately
3.5 units of heat energy per each unit of electrical energy
used, as compared to a maximum of only 1 unit of heat
energy produced with conventional heating systems.
Incoldertemperatures,theheatpumpperformslikeanair
conditioner run in reverse.Available heat energy outside
the home is absorbed by the refrigerant and exhausted
insidethehome.Thisefcientprocessmeansyouonly
pay for“moving”the heat from the outdoors to the indoor
area.You do not pay to generate the heat, as with more
traditional furnace designs.
During summer, the heat pump reverses the flow of the
heat-absorbingrefrigeranttobecomeanenergy-efficient,
central air conditioner. Excess heat energy inside the
home is absorbed by the refrigerant and exhausted
outside the home.
OPERATING INSTRUCTIONS
Thermostat styles vary.Somemodels maynotinclude
theAUTOmodeandotherswillhavetheAUTOinplace
ofthe HEAT and COOL.Others mayinclude all three.
Please refer to the thermostat’s User Manual for detailed
programming instructions.
Thethermostatshouldbemountedabout5feetabovethe
floor on an inside wall and not on an outside wall or other
locationwhereitsoperationmaybeadverselyaffectedby
radiant heat from fireplaces, sunlight, or lighting fixtures,
and convective heat from warm air registers or electrical
appliances.
Cooling Operation Only
1. Setthethermostat’ssystemmodetoCOOLorAUTO
andchangethefanmodetoAUTO.SeeFigure1
2. Set the temperature selector to the desired
temperaturelevel.Theoutdoorfan,compressor,and
blower motor will all cycle on and off to maintain the
indoor temperature at the desired cooling level.
NOTE: If the temperature level is re-adjusted, or the
system mode is reset, the fan and compressor in the
outdoor unit may not start immediately. A protective
timer circuit holds the compressor and the outdoor
fan off for approximately three minutes following a
previous operation or the interruption of the main
electrical power.
Heating Operation Only
1. Setthethermostat’ssystemmodetoHEATorAUTO
andchangethefanmodetoAUTO.SeeFigure1.
2. Set the temperature selector to the desired
temperaturelevel.Thecompressor,outdoorfan,and
blower motor will cycle on and off to maintain the
indoor temperature at the desired heating level.
NOTE: If the temperature level is re-adjusted, or the
systemmodeisreset,thefan and compressor in the
outdoor unit may not start immediately. A protective
timer circuit holds the compressor and the outdoor
fan off for approximately three minutes following a
previous operation or the interruption of the main
electrical power.
Emergency Heat
SomethermostatsmayincludeasystemmodecalledEM
HTorAUXHT,etc.Thisisaback-upheatingmodethat
should only be used if a problem is suspected.With the
modesettoEMHT,etc.,thecompressorandoutdoorfan
willbelockedoffandsupplementalheat(electricresistance
heating)willbeusedasasourceofheat.Sustaineduse
of electric resistance heat in place of the heat pump will
result in an increase in electric utility costs.
DefrostOperation
During cold weather heating operation, the outdoor unit
willdevelopacoatingof snowandiceontheheattransfer
coil.Thisisnormalandtheunitwilldefrostitself.Thisunit
featuresAdaptiveDemandDefrostthatmonitorsambient
and coil temperatures to regulate the defrost function
accordingly.
At the beginning of the defrost cycle, both the outdoor
condenser fan and compressor will turn off. After
approximately 30 seconds, the compressor will turn on
and begin to heat the outdoor coil causing the ice and
snow to melt. NOTE: While the ice and snow is melting,

3
some steam may rise from the outdoor unit as the warm
coil causes the melting frost to evaporate.When defrost
is completed, the outdoor fan motor will start, and the
compressor will turn off again. In approximately 30
seconds the compressor will start up again and continue
normal operation.
Operating the Heat Pump for Automatic
Cooling & Heating
1. SetthethermostatsystemswitchtoAUTOandthe
thermostatfanswitchtoAUTO.SeeFigure1.
NOTE:Thermostats will vary. Some models will not
include the AUTO mode, and others will have the
AUTOinplaceoftheHEATandCOOL,andsome
will include all three.
2. Set the thermostat temperature to the desired heating
and cooling temperature level(s).The outdoor unit
and the indoor blower will then cycle on and off
in either the heating or cooling mode of operation
as required to automatically maintain the indoor
temperature within the desired limits.
Operating the Indoor Blower Continuously
Thecontinuousindoorbloweroperationistypicallyusedto
circulatetheindoorairtoequalizeatemperatureunbalance
due to a sun load, cooking, or fireplace operation.
SetthethermostatfanmodetoON(Figure1).Theindoor
blowerstartsimmediately,andwillruncontinuallyuntilthe
fanmodeisresettoAUTO.
Thecontinuousindoorbloweroperationcanbeobtained
with the thermostat system mode set in any position,
includingOFF.
Shutting the Heat Pump Off
Changethethermostat’ssystemmodetoOFFandthefan
modetoAUTO.SeeFigure1.NOTE:Thesystemwillnot
operate, regardless of the temperature selector setting
TROUBLESHOOTING
BeforeyoucallaTechnician,checkthefollowing:
• Checkthethermostatsetting.Makesurethesystem
mode and temperature settings are correct.
• Checktheelectricalpanelfortrippedcircuitbreakers.
• Checktheltersfordustaccumulation.
• Check the unit and make sure it is clean and not
covered with grass or leaves.
• Iftheitemsabovedon’tresolveyourproblems,then
call your nearest service technician.
HEAT PUMP MAINTENANCE
WARNING:
The T4BD heat pump contains liquid and
gaseousrefrigerantunderpressure.Installation
and servicing should only be attempted by
qualified,trainedpersonnelthoroughlyfamiliar
with the equipment and safe responsible
refrigerant handling procedures. Failure to
comply with this warning could result in
equipment damage, personal injury, or death.
WARNING:
To prevent 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.
Proper maintenance is important to achieve optimum
performancefromtheheatpump.Theabilitytoproperly
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:
Regular Cleaning
CAUTION:
DO NOT touch any of the internal electrical
components while cleaning the unit.
• Theareaaroundtheunitandthevicinityofanyother
appliances must be kept clear and free of combustible
materials, gasoline, and other flammable vapors and
liquids. Do not store or use flammable items such as
gasoline, paint, varnish, or strippers in the vicinity of
the unit.
• Keeptheoutdoorunitclean.Hoseoffperiodicallyand
keep unit fins clear of leaves and grass clippings. Be
careful not to damage the aluminum fins. Clean
the outdoor coil and fins as necessary using a mild
detergent and water. Rinse thoroughly with water.
• Keeptheoutdoorunitclearofobstructions.DONOT
obstructairowwithtallplantsorshrubs.Checkforand
remove any obstructions such as twigs, sticks, etc.
• Inspectthecondensatedrainandoutdoorcoilatthe
beginning of each cooling season.Remove any debris.
• Annually inspect the physical support of the unit to
ensure that it is physically sound without sagging,
cracks, gaps, etc.

Specifications & illustrations subject to change without notice or incurring obligations.
O'Fallon,MO|PrintedinU.S.A.(11/12)
WARRANTY INFORMATION
A warranty certificate with full details is included with the
equipment. Carefully review these responsibilities with
yourdealerorservicecompany.Themanufacturerwillnot
be responsible for any costs found necessary to correct
problems due to improper setup, improper installation,
adjustments, improper operating procedure on the part
of the user, etc.
Some specific examples of service calls which are not
includedinthelimitedwarrantyare:
• Correcting wiring problems in the electrical circuit
supplying the equipment.
• Resettingcircuitbreakersorotherswitches.
• Adjustingorcalibratingofthermostat.
Air Filters
WARNING:
Never operate the unit without a filter in the
returnair system.Dustand lintin thereturn
air can build up on the internal components,
resulting in loss of efficiency, equipment
damage, and possible fire risk.
• Inspectandcleanorreplaceairltersatthebeginning
of each heating and cooling season,or more frequently
if required.A clogged filter could cause airflow related
problems and reduce the overall efficiency of your unit.
Always replace disposable filter(s) installed in your
system only with the same size dimensional filters
that are being replaced.
7095730 (Replaces7093030)