Nordyne B6BV Series User manual

AIR HANDLER
B6BV Series
INSTALLATION INSTRUCTIONS
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
abletoinstalltheproductaccordingto strict safetyguidelines and instructing thecustomeron
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.
Please read all instructions carefully before starting the installation. 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. If a problem occurs, check the instructions and follow recommendations given.
If these suggestions don’t eliminate your problem, call your servicing contractor. Return this
manual to the customer’s package for future reference.
For HUD approved installations in manufactured homes and modular homes

2
IMPORTANT SAFETY INFORMATION .......................3
GENERAL INFORMATION..........................................3
Requirements & Codes.............................................3
About the Air Handler................................................3
Mounting Applications...............................................3
BeforeYou Install this Appliance ...............................4
Locating the Air Handler............................................4
Minimum Clearances.................................................4
CIRCULATING AIR SUPPLY.......................................4
Return Air Connections.............................................5
Supply Air Connections.............................................5
Unconditioned Spaces ..............................................5
Acoustical Duct Work ................................................5
Air Filters...................................................................5
Ventilaire III or IV Air Quality Package.......................6
AIR HANDLER INSTALLATION..................................6
Upflow Installations ...................................................6
Downflow Installations...............................................6
Plenum Connector Installation...............................6
A/C or H/P Coil Installation........................................7
ELECTRICAL CONNECTIONS...................................8
Pre-Electrical Checklist .............................................8
Line Voltage...............................................................8
Single Circuit Adaptor Kit.......................................8
Dual Supply Circuits...............................................8
Control Board............................................................8
Twinning.................................................................8
Thermostat Connections...........................................9
Grounding..................................................................9
STARTUP & ADJUSTMENTS .....................................9
BeforeYou Start the Unit...........................................9
Air Circulation Check.................................................9
Running the Blower Continuously.............................9
System Cooling.........................................................9
System Heating.........................................................9
Turning the Blower Off..........................................10
Blower Configurations.............................................10
Determining Nominal System Capacity ...............10
Selecting Continuous Low Spd Fan Operation ....10
Proper Blower Speed for Multi Speed Units.........10
High Efficiency Units (Var. & Fixed Speed)..........10
Selecting Basic Heating Airflow...........................10
Selecting Basic Cooling/Heat Pump Airflow.........10
Dehumidification Options ........................................11
UNIT MAINTENANCE................................................11
TROUBLESHOOTING ...............................................12
FIGURES &TABLES .................................................13
Figure 9. B6BV Physical Dimensions...................13
Airflow Data.............................................................14
Table 6. B6BV Airflow Settings.............................14
Table 7a. B6BV Airflow Data (B-Cabinet).............14
Table 7b. B6BV Airflow Data (C-Cabinet).............14
Electrical Diagrams & Data .....................................15
Table 8. B6BV MCA & MOP Data ........................15
Figure 10.Typical T-Stat Connections..................15
Figure 11. Single Stage Control Board ................16
Figure 12.Two-Stage Control Board....................16
Figure 13.Two-Stage Fix.Sp.Control Board........17
Table 9. B6BV Heat Element Logic......................17
Figure 14.W.D., PSC Mtr, 10Kw, B-Cabinet.........20
Figure 15.W.D., PSC Mtr, 15Kw, B-Cabinet.........21
Figure 16.W.D.,FSHE Mtr, 10Kw, C-Cabinet ......22
Figure 17.W.D., FSHE Mtr, 20Kw, C-Cabinet......23
INSTALLATION / PERFORMANCE CHECKLIST.....24
TABLE OF CONTENTS

3
IMPORTANT SAFETY INFORMATION
NOTE TO INSTALLER: Please read all instructions
beforeservicingthisequipment.Payattentiontoallsafety
warnings and any other special notes highlighted in the
manual.
Safety markings are used frequently throughout this
manualtodesignateadegreeorlevelof seriousnessand
should not be ignored.WARNING indicates a potentially
hazardous situation that if not avoided, could result in
personalinjuryordeath.CAUTIONindicatesapotentially
hazardoussituationthatifnotavoided,mayresultinminor
or moderate injury or property damage.
WARNING:
ELECTRICAL SHOCK, FIRE OR EXPLOSION
HAZARD
Failure to follow safety warnings exactly could
result in serious injury or property damage.
Improper servicing could result in dangerous
operation, serious injury, death or property
damage.
• Beforeservicing,disconnectallelectricalpower
to air handler.
• Whenservicingcontrols,labelallwiresprior
to disconnecting. Reconnect wires correctly.
• Verifyproperoperationafterservicing.
GENERAL INFORMATION
Requirements & Codes
WARNING:
This unit must be installed in accordance with
instructions outlined in this manual 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 personal
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 for
special installation requirements.
• Thisequipment contains nitrogengas.Installation or
servicingshould only be performed byqualifiedtrained
personnel thoroughly familiar with this type equipment.
• Allelectricalwiringmustbecompletedinaccordance
with local, state and national codes and regulations
andwith the National Electric Code (ANSI/NFPA 70) or
andHUDManufacturedHomeConstructionandSafety
Standard, Title 24 CFR, Part 3280. If this standard
is not applicable, the installation must be comply to
the Standard for Manufactured Home Installation
Manufactured Home Sites, Communities and Setups
(ANSI 225.1). In Canada all electrical wiring must be
completed in accordance with the Canadian Electric
Code Part 1 CSA C.22.1
• Installationofequipmentmayrequirebrazingoperations.
Installer must comply with safety codes and wear
appropriate safety equipment (safety glasses, work
gloves,fireextinguisher, etc.) when performingbrazing
operations.
• Install this unit only in a location and position as
specifiedonpage4.ThisunitisdesignedonlyforIndoor
installations and should be located with consideration
of minimizing the length of the supply and return ducts.
Refer to the rating plate orTables 6a & 6b (page 17) for
proper circulating airflow data.
• 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.
About the Air Handler
This appliance has been tested and certified by AHRI for
capacityandefficiencyandwillprovidemanyyearsofsafe
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.Pleasereadallinstructionsbefore
installing the unit.
The B6BV Series electric furnace is approved for use
in HUD code manufactured homes (HUD Manufactured
Home Construction and Safety Standard (Title 24, Part
3280) and other modular home applications
B6BV Series electric furnaces are supplied with factory
installed electric heat. Approved NORDYNE heat-pump/
air conditioning coils may be installed in the field.Unless
otherwisenotedintheinstructions,onlyfactoryauthorized
kits or accessories may be used when modifying this
product.
Mounting Applications
Vertical only air handlers are factory ready for upflow
applications.Theseunitsmayalsobeappliedindownflow
dischargeapplicationswhenappliedwiththeappropriate
field kit.
Through-the-floor installations require a 1/4” thick
noncombustible resilient gasket to be used whenever the
supplyorreturnairductspassthroughthefloor.Thegasket
should be positioned between the duct, unit, and floor.

4
BeforeYou Install this Appliance
√This equipment is securely packaged at the time of
shipmentanduponarrivalshouldbecarefullyinspected
for damage prior to installing the equipment at the job
site.Claimsfordamage(apparentorconcealed)should
be filed immediately with the carrier.
√It is recommended that the heating area should be
calculatedandasystemofthepropercapacityselected.
√Checktheelectricalsupply andverifythepowersupply
isadequateforunitoperation.Thesystemmustbewired
and provided with circuit protection in accordance with
localbuildingcodes.Ifthereisanyquestionconcerning
the power supply, contact the local power company.
√Verify the duct system is appropriate for the air handler
being installed. Please note that when replacing an
existing system with lower air-flow, the duct system
may require modification.
Locating the Air Handler
• Surveythejobsitetodeterminethebestlocationfor
mounting the unit. Consideration should be given to
availabilityofelectricpower,serviceaccess,andnoise.
• Thedimensions of theroomor alcovemustbe able
to accommodate the overall size of the unit and the
installation clearances listed in Table 1. Physical
dimensionsforthisairhandlerarealsoshowninFigure
9 (page 13).
• This unit should be located with consideration of
minimizing the length of the supply and return ducts.
Refer to the rating plate orTables 6, 7a & 7b (page 14)
for proper circulating airflow data.
Table 1. Minimum Unit Clearances
INSTALLATION CLEARANCES
Left Side......... 0 Inches Right Side...... 0 Inches
Back...............0 Inches Front...........†See Notes
†
NOTES:
Closet or Alcove Installations:
• Allow24in.minimumclearancefromfrontofunittonearestwall
or partition for servicing. Recommended clearance is 36 in.
• Areturnairgrillshouldbeinstalledinthedoororapartiallylouvered
door across the opening for proper air circulation.Provide at least
235 in2free opening for return air for B-cabinet models and 300
in2for C-cabinet models. A fully louvered closet door is strongly
recommended for both installation types.
REAR
RIGHT
SIDE
LEFT
SIDE
FRONT
Minimum Clearances
• This appliance must be installed in accordance with
clearances listed in Table 1. The air handler must be
installed with ample clearance for easy access to the
air filter, blower assembly, heater assembly, controls,
and vent connections.
• Staticpressure drop through louveredopenings and
through return air plenums should be considered in
the overall duct design in the determination of the total
external static pressure.
• Allelectricheaterkitslessthan20kwareapproved
for use in air handler installations with zero-clearance
to combustibles at any blower speed. For upflow
configuration, B6 electric furnace equipped with 20 kw
electric heater kits are approved for installation with
zero clearance to combustibles at any blower speed.
Plenums & Air Ducts
WARNING:
All return ducts must be secured to the air
handler using appropriate methods. All return
ducts must be adequately sealed.When return
air is provided through the bottom of the unit,
the joint between the air handler and the return
air plenum must be air tight.
Returnairand circulatingair ductsmustnotbe
connected to any other heat producing device
such as a fireplace insert, stove, etc.This may
result in fire, explosion, carbon monoxide
poisoning,personalinjury,orpropertydamage.
• Plenums and air ducts should be installed in
accordance with the standards of the National Fire
Protection Association Standard for Installation of
Air Conditioning Systems (NFPA 90A), Standard for
Installation of Residence Type Warm Air Heating
and Air Conditioning Systems (NFPA 90B), and all
applicablelocalcodes.NFPApublicationsareavailable
by writing to: National Fire Protection Association,
Batterymarch Park, Quincy, ME 02269 or visit
www.NFPA.org online.
• Designtheductworkaccordingtomethodsdescribed
bytheAirConditioningContractorsofAmerica(ACCA).
Airductsmustbealuminum,tin plate,galvanizedsheet
steel, or other approved materials for outlet or return
air ducts. Snap-Lock or Pittsburgh-Lock seams are
preferred.All other types of seams must be made tight
to prevent leakage.
• GASPIPING MUST NOTRUNIN ORTHROUGHANY
OF THE AIR DUCT SYSTEM.
• This unit is designed only for use with a return and
supply duct. The ducts should be appropriately sized
to the capacity of the air handler to ensure its proper

5
air handler and the return air opening. If no part of the
return air opening is directly adjacent to the unit no
clearance is required.
• In applications where the supply ducts carry heated
air to areas outside the space where the furnace is
installed,thereturn airmustbedeliveredtothefurnace
by duct(s) secured to the furnace casing, running full
size and without interruption.
Supply Air Connections
• The supply duct system must be designed so that the
static pressure measured external to the furnace does
not exceed the listed static pressure shown on the
furnace rating plate.The supply air must be delivered
to the heated space by duct(s) secured to the furnace
casing, running full length and without interruption.
Unconditioned Spaces
All duct work passing through unconditioned space must
beproperlyinsulatedtominimizeductlossesandprevent
condensation.Use insulation with an outer vapor barrier.
Refer to local codes for insulation material requirements.
Acoustical DuctWork
• Certain installations may require the use of acoustical
lininginside thesupply duct work.Acoustical insulation
must be in accordance with the current revision of the
Sheet Metal and Air Conditioning Contractors National
Association (SMACNA) application standard for duct
liners.DuctliningmustbeULclassifiedbattsorblankets
with a fire hazard classification of FHC-25/50 or less.
• Fiberductworkmaybeusedinplaceofinternalduct
liners if the fiber duct work is in accordance with the
current revision of the SMACNA construction standard
on fibrous glass ducts. Fibrous duct work and internal
acoustical lining must be NFPA Class 1 air ducts when
tested per UL Standard 181 for Class 1 ducts.
• Damping ducts, flexible vibration isolators, or pleated
media-style filters on the return air inlet of the air
handler may be used to reduce the transmission of
equipment noise eminating from the air handler.These
treatmentscanproduceaquieterinstallation,particularly
in the heated space. However, they can increase the
pressure drop in the duct system. Care must be taken
to maintain the proper maximum pressure rise across
the air handler, temperature rise and flow rate. This
may mean increasing theduct sizeand/or reducing the
blower speed.These treatments must be constructed
and installed in accordance with NFPA and SMACNA
construction standards. Consult with local codes for
special requirements.For best sound performance, be
sure to install all the needed gaskets and grommets
around penetrations into the air handler, such as for
electrical wiring.
Air Filters
B6BVseriesair handlers arenotsuppliedwithanairfilter
whenshipped fromthe factory.The installer mustprovide
ahighvelocityfilterthatisappropriatelysizedtothereturn
airflow rating. Refer to the rating plate or Tables 6, 7a
& 7b (page 14) for proper circulating airflow data.
• Use transition ttings if the supply and/or return air
openings of the unit do not match the duct openings.
Thesetransitionsshouldbedimensionedinaccordance
with standard practice as specified in the ASHRAE
recommendations for duct transitions.
• Flexibleconnectorsmaybeusedbetweentheunitand
the ductwork to prevent transmission of vibration from
the unit to the structure. Heat resistant material must
be used for the flexible connector at the supply air end
of the unit.
• It is good practice to seal all connections and joints
with industrial grade sealing tape or liquid sealant.
Requirements for sealing ducts vary from region to
region.Consultwithlocalcodesforrequirementsspecific
to your area.
Return Air Connections
For each application in the USA, the home manufacturer
shall comply with all of the following conditions to have
acceptable return air systems for closet installed forced
air heating appliances:
• Regardlessofthelocation,thereturnairopeningintothe
closetshallnotbelessthanspecifiedintheappliance’s
listing.
• Meansshallbeprovidedtopreventinadvertentclosure
by a flat object placed over the return air opening when
it is located in the floor of the closet (versus the vertical
front or side wall).
• The cross-sectional area of the return duct system
leading into the closet shall not be less than 390 in2.
• Thetotalfreeareaofopeningsintheoororceiling
registers serving the return air duct system must be at
least 352 in2. At least one register should be located
where it is not likely to be covered by carpeting, boxes
and other objects.
• Materialslocatedinthereturnductsystemmusthavea
flamespread classificationof 200 or less.Thisincludes
a closet door if the air handler is in a closet.
• Test thenegativepressure inthecloset withthe air-
circulating fan operating at high speed and the closet
closed.Thenegativepressureistobenomorenegative
than minus 0.05 inch water column.
• For oor return systems, the manufactured home
manufacturer shall affix a prominent marking on or
near the appliance where it can be easily read when
the closet door is open.The marking shall read:
CAUTION:
HAZARD OF ASPHYXIATION: Do not cover or
restrict return air opening.
• Thereturnairopeningcanbelocatedinaclosetdooror
a sidewall. If the return air opening is directly adjacent
to the side (or front) of the air handler, 6” minimum
clearance must be provided between the side of the

6
(approximately130lbs.forB-cabinetmodelsand200lbs.
for C-cabinet models). The construction of the pedestal
stand must also allow for at least 235 in2free opening
(300 in2for C-cabinet models) in the application. Field
fabricated upflow pedestal mounting stands must be
constructed of noncombustible materials.Position the air
handlerontopofthemountingstandandsecuretogether
with sheet metal screws.The screws must penetrate the
sheet metal cabinet and duct. Tape or seal all seams if
required by local code.
Downflow Installations
B6BVairhandlerscanbeconvertedtodownflowoperation
by flipping an upflow unit 180°. A typical installation of
the unit in a downflow application is shown in Figure 1.
NOTE:Downflowinstallationsrequiretheuseofaplenum
connector (or its equivalent) if the supply air ducts pass
through the floor of the structure. This factory supplied
accessorymustbeinstalledinthefloorcavityandattached
tothesupplyairductbeforethedownflowunitisinstalled.
Available plenum connectors for all B6BV air Handlers
are listed in Table 2 (page 7). All return air in downflow
applications must enter through the top of the unit.
Positiontheairhandlerontopoftheplenumconnectorand
securetogetherwithsheetmetalscrews.Thescrewsmust
penetratethesheetmetalcabinetandplenumconnector.
Tape or seal all seams if required by local code.
Plenum Connector Installation
Theplenumconnectorisdesignedforusewithtrunkducts
having a minimum width of 12”. If sufficient space is not
available to adequately bend and secure duct tabs it may
be necessary to attach the connector to the duct using
Figure 1. Installation Configurations
Return
Air
Return
Air
UPFLOW
DOWNFLOW
air duct opening or filter rack located in the bottom of the
unit. Accessing the filter does not require tools and can
beremovedfromthefrontoftheunitbyremovingthefilter
door.See Unit Maintenance (page 13) for filter sizes and
installation information.
WARNING:
Never operate the air handler without a filter
or with doors removed. Dust and lint can build
uponinternal components,resulting in loss of
efficiency,equipmentdamage,andpossiblefire.
AIR HANDLER INSTALLATION
These Installation procedures are suggested for typical
airhandlerinstallations.Sinceallinstallationsaredifferent
from each other, the sequence of these steps may
differ from the actual installation. Only qualified HVAC
technicians should install this furnace.
The B6BV series air handler is shipped ready for vertical
upflow installation and is approved for attic, basement,
alcove/closetorcrawlspaceinstallationwithzeroclearance
to combustibles. See Table 1 (page 4) for required
installationclearances.Thisapplianceisapprovedonly
for indoor use.
• RemovetheshippingcrateandUser’sManualfromthe
equipment.
• Theunitmustbeleveledatinstallationandattachedto
a properly installed duct system.
• Thesurfacethattheairhandlerismountedonmust
provide sound physical support of the unit.
• Theairhandlermustbeinstalledsothatallelectrical
components are protected from water.
• Ifalouvereddoorisinstalledacrossthefrontofthis
unit, the appliance must be mounted flush or behind
front edge of finished wall.
Upflow Installations
All air handlers are factory shipped, ready for upflow
installation.Allreturnairmustenterfromthebottomofthe
unit when installed in the upflow configuration. A typical
upflow unit is shown in Figure 1.
Position the air handler on top of the return air duct and
securetogetherwithsheetmetalscrews.Thescrewsmust
penetrate the sheet metal cabinet and duct.Tape or seal
all seams if required by local code.
To attach the supply air duct to the air handler, bend the
perforated flanges (Figure 3, page 7) upward 90° with a
pair of wide duct pliers. Position the duct on top of the
air handler and secure together with sheet metal screws.
Makesurethescrewspenetratethesheetmetalcasingand
flanges.Tape or seal all seams if required by local code.
NOTE:Ifan upflowpedestalmountingstandisfabricated
in the field, the stand must be constructed strong
enough to support the unit with all accessories installed

7
Table 2. Optional Accessory Kits
Description Cabinet Size
B C
Downflow Plenum Connector, 6.25” 913840 914969
Downflow Plenum Connector, 8.25” 913841 914970
Downflow Plenum Connector, 10.25” 913842 914971
Upflow Pedestal Mounting Stand 913872 913873
Downflow Coil Adaptor 919321 919322
*919323
* Use when installing B width coil in C width cabinet
sheet-metalfastenersandsealwithanapprovedfoiltape.
The connector may be field constructed but must meet
requirements as listed in the unit installation instructions.
1.Measureandmarktheoutlineofthecut-outonthefloor.
See Figure 2 for cutout dimensions.
IMPORTANT!:Cut-outsinthefloorand ductworkmust
becarefullylocatedtoavoidmisalignmentofthefurnace
and supply / return air ducts.
2.Cut out the floor opening.
NOTE:Toallowsomeclearanceforinstallingtheplenum
connector, cut the opening 1/16”larger than the actual
cutout drawn.
3.Center the plenum connector in the floor opening with
bottom tabs resting on top of the supply air duct.
4.Mark the cut-out area on the supply air duct by tracing
around the connector tabs of the plenum connector.
5.Remove the plenum connector and cut out the marked
area of the supply air duct.
NOTE:Toallowsomeclearanceforinstallingtheplenum
connector, cut the opening 1/4”larger the actual cutout
drawn.
6.Install theduct connector backin thefloor openingwith
the bottom tabs extending into the supply air duct.See
Figure 4.
7.Secure the plenum connector to the wood floor with
appropriate size screws.
8.Bend the connector tabs on the bottom of the plenum
connectorupwardsandastightaspossibleagainstthe
supply air duct. See Figure 4.
9.Seal all connections with industrial grade sealing tape
orliquidsealant.Requirementsforsealingductwork
varyfromregiontoregion.Consultwithlocalcodes
for requirements specific to your area.
A/C or H/P Coil Installation
Approved air conditioning and heat pump system
components are listed on the unit nameplate. To install
the indoor coil:
1.Remove door cover plate, door and coil close-off plate
(with insulation). Discard door cover plate.
2.UpflowApplications:Slidethecoilintothetracklocated
in the bottom of the unit.
Downflow Applications:The downflow adaptor must be
used(seeTable2).Installthedownflowadaptorandcoil
as directed in the instructions supplied with the kit.
3.Reinstallthedoorandcoilclose-offplate(withinsulation).
NOTE:Indownflowapplicationsthedoorisrotated180°
so that the refrigerant and condensate lines remain on
the left side.
4.Install the refrigerant and condensate lines as directed
in the instructions supplied with the outdoor unit.
Plenum
Connector
Connector
Tabs
Supply
Air Duct
Wood Floor
Duct Connector
Supply
Air Duct Bend tabs tightly
against supply air duct
Figure 4. Duct Connector Installed
Figure 2. Plenum Adapter
13.25"
18.5" (B-Cab.)
21.25" (C-Cab.)
Figure 3. Perforated Flanges

8
listedconduitandconduitconnectorsforconnectingthe
supply wires to the unit and for proper grounding.Field
supplied bushings for the power supply cables must be
added to support and protect the power supply cables.
• Ifreplacinganyoftheoriginalwiressuppliedwiththe
unit,thereplacementwiremustbecopperwireconsisting
of the same gauge and temperature rating.
• CircuitbreakersinstalledintheB6BVseriesairhandler
are for short-circuit protection of the internal wiring
and to serve as a unit disconnect.They do not provide
over-currentprotectionofthesupplywiring.Overcurrent
protection must be provided at the branch circuit
distributionpanel andsized as shownon the unit rating
label and according to applicable local codes.See the
unit rating plate and Table 8 (page 15) for maximum
circuit ampacity and maximum overcurrent protection
limits.
• All208/230Voltunitsareshippedfromthefactorywired
for 240 volt operation.For 208V operation, remove the
lead from the transformer terminal marked 240V and
connect it to the terminal marked 208V.
Single Circuit Adaptor Kit
If a single circuit adaptor kit is used, it may need to be re-
configuredforsomeapplications.Removethesinglecircuit
adaptor kit cover and verify that the lugs are configured
correctly for the application.If the lugs are not configured
for the application, refer to the instructions included with
the kit and modify the configuration.
Install the single circuit adaptor kit (if used) in the line
side (“on” end) of the circuit breakers. Tighten the lugs
securely (45 in-lbs recommended). Connect the supply
wiring to the circuit breakers, single circuit adaptor kit, or
terminal block.Tighten the lugs securely.
Dual Supply Circuits
When using dual supply circuits verify that the supply
sized for circuit “A” is connected to the circuit breaker
that is connected to the top element assembly. Replace
metal circuit breaker line cover.Refer to Figure 10 (page
15) for thermostat wiring examples.
Control Board
The control board in the air handler controls the timing
sequence of the elements.The board is equipped with a
3 second blower ON delay and a 15 second blower OFF
delay in heating and a 40 second blower OFF delay in
cooling. See Figures 11 or 12 (page16).
Twinning
B6BMairhandlersarenotsuppliedwithabuiltintwinning
capability. To connect two air handlers to a common
singlestageACcondensingunitorheatpump,atwinning
kit is available for field installation. Please follow the
instructions supplied with the kit.
NOTE: Variable speed air handlers cannot be twinned.
ELECTRICAL CONNECTIONS
WARNING:
ELECTRICAL SHOCK, FIRE OR EXPLOSION
HAZARD
Failure to follow safety warnings exactly could
result in serious injury or property damage.
Improper servicing could result in dangerous
operation, serious injury, death or property
damage.
• Beforeservicing,disconnectallelectricalpower
to the air handler.
• Whenservicingcontrols,labelallwiresprior
to disconnecting. Reconnect wires correctly.
• Verifyproperoperationafterservicing.
Electrical connections must be in compliance with all
applicable local codes and ordinances, and with the
currentrevisionoftheNationalElectricCode(ANSI/NFPA
70).ForCanadianinstallations,theelectricalconnections
and grounding shall comply with the current Canadian
Electrical Code (CSA C22.1 and/or local codes).
Pre-Electrical Checklist
√Verify the voltage, frequency, and phase of the supply
sourcematchthespecifications ontheunit ratingplate.
√Verifythatthe serviceprovidedbytheutilityissufficient
tohandletheadditionalloadimposedbythisequipment.
See the unit wiring label orTable 7 (page 17) for proper
high and low voltage wiring.
√Verify factory wiring is in accordance with the unit
wiringdiagrams(Figures15-18,pages20-23).Verifyno
connectionscamelooseduring shipping or installation.
LineVoltage
• Anelectricaldisconnectmustbelocatedwithinsight
ofandreadilyaccessibletotheunit.Thisswitchshall
becapableofelectricallyde-energizingtheoutdoorunit.
Seeunitdatalabelforproperincomingfieldwiring.Any
other wiring methods must be acceptable to authority
having jurisdiction.
• Itisrecommendedthatthelinevoltagetotheunitbe
suppliedfrom a dedicated branch circuit containing the
correct fuse or circuit breaker for the unit.
• The installer should become familiar with the wiring
diagram/schematic before making any electrical
connections to the unit. See the unit wiring label or
(Figures 15-18, pages 20-23).
• Useonlycopperwireforthelinevoltagepowersupply
to this unit.Use proper code agency listed conduit and
a conduit connector for connecting the supply wires to
the unit.Aluminum supply wire may be used if a heater
kit is installed.
• Providepowersupplyfortheunitinaccordancewiththe
unit wiring diagram, and the unit rating plate. Use UL

9
STARTUP & ADJUSTMENTS
BeforeYou Start the Unit
Prior to start-up, complete the following inspections:
√Verifytheunitislevelandproperlylocatedwithadequate
clearances for servicing the unit.See Table 1 (page 4).
√Check condensate drain line(s) for proper drainage (if
applicable).
√Verify the surrounding area and top of the unit is free
from obstructions and debris.
√Check all duct connections. Make sure the duct work
is adequately sealed to prevent air leakage.
√Check all coil connections for leaks (if applicable).
√Verify that the line voltage power leads are securely
connectedandtheunitisproperlygrounded.Makesure
alldoors are installedbeforerestoring powerto the unit
√Verify the thermostat is wired correctly. Make sure all
low voltage wires are securely connected.
√Verify the power supply branch circuit overcurrent
protection is sized properly.
√Verify filter is properly and securely installed.
Air Circulation Check
Running the Blower Continuously
Set the thermostat’s system mode to OFF and the
thermostat’s fan mode to ON.The blower motor should
run continuously.Check for air delivery at the register(s).
Make sure that there are no obstructions at the registers
or in the ducts.
NOTE:Ifbloweristurningoppositeofarrowdirection,shut
off main power to the unit and switch any two field wires
at the disconnect. DO NOT alter unit wiring.
System Cooling
1.Set the thermostat’s system mode to COOL and fan
mode to AUTO. Lower the thermostat’s temperature
mode below room temperature and observe that the
blower energizes. Check the air being discharged at
the register is cooler than room temperature. Verify
unit refrigerant pressures are in order. Blower should
be turning in direction indicated by arrow.
NOTE:DONOTalterunitwiring.Listenforanyunusual
noises.Locate the source and correct as needed.
2.Allow the unit to run for several minutes and then set
thethermostat’stemperatureaboveroomtemperature.
Verify the blower cycles off with the thermostat.
System Heating
1.Set thethermostat’ssystem modeto HEAT and thefan
mode to AUTO.Increase the thermostat’s temperature
above room temperature and observe that the blower
energizes.Checktheairbeingdischargedattheregister
is warmer than room temperature.
2.Allow the unit to run for several minutes and then set
thethermostat’s temperaturebelowroom temperature.
Verify the blower cycles off with the thermostat.
Thermostat Connections
• Thermostatconnectionsshallbeinaccordancewiththe
instructionssuppliedwiththethermostat.Thethermostat
used with this equipment must operate in conjunction
withanyinstalledaccessories.TypicalACandairhandler
hookups are shown in Figure 10 (page 15).
CAUTION:
Isolation must be maintained from the external
Class 2 output of any transformer in a cooling
circuit.Useathermostatwithisolatingcontacts
to prevent inter-connection of Class 2 outputs.
• Wherelocalcodesrequirethatthethermostatwiring
must be routed through a conduit or raceway, splices
can be made inside the unit; however, all wiring must
be NEC Class 1 and must be separated from incoming
power leads.
• Thethermostatshouldbemountedabout5feetabovethe
flooronaninsidewall.DONOTinstallthethermostaton
anoutsidewalloranyotherlocationwhereitsoperation
maybeadverselyaffectedbyradiantheatfromfireplaces,
sunlight, or lighting fixtures, and convective heat from
warm air registers or electrical appliances.Refer to the
thermostatmanufacturer’sinstructionsheetfordetailed
mounting and installation information.
• Installthegrommet,whichispackedwiththeunit,in
the hole for low-voltage wires. Properly connect the
low-voltage wiring between the thermostat, outdoor
unit, and control board. NOTE: When the low voltage
wires are positioned in this grommet, the grommet will
preventchafingand/orshortingofthelowvoltageleads.
Grounding
WARNING:
Theunit cabinetmusthavean uninterruptedor
unbrokenelectricalgroundtominimizepersonal
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
C22.1 Electrical Code.Use the grounding lug provided in
the control box for grounding the unit.

10
Turning the Blower Off
Set thermostat’s fan mode to AUTO, the blower will shut
down immediately.
Blower Configurations
Determining Nominal System Capacity
To select the appropriate airflows for the air handler, the
nominal system capacity must be known. The nominal
system capacity is always the nominal capacity of the
outdoor unit. However, in some situations the nominal
systemcapacitymaynotbethesameasthecapacityrating
oftheairhandler.Alwaysrefertothecapacityratingofthe
outdoor unit to determine the nominal system capacity.
Selecting Continuous Low Speed Fan Operation
TheB6BVseriesairhandlerisequippedwiththeoptionof
continuouslowspeedfanoperation.WhenGisenergized
withoutY/Y2,theairhandlerwilloperateusingtheheating
speed.With G& Y/Y2 or Y/Y2 energized, the B6 electric
furnacewilloperateintheselectedcoolingspeed(including
40 sec blower-off delay). NOTE: To achieve continuous
low speed fan operation Gmust be connected at the B6
electric furnace.
Proper Blower Speed for Multi-Speed Units
The blower speed is preset at the factory for operation
at the same speed for heating and cooling, by using the
jumping terminal on the blower motor and connecting it
to the desired speed with both the red and black wires
connected to the jumping terminal.
NOTES:
• The control board is programmed with a 40 second
off delay in the cooling mode for optimum system
performance and efficiency.
• When using a 20 kw electric heat kit in a downflow
installation, the blower must be set for high speed for
both heating and cooling.
CAUTION:
To avoid personal injury or property damage,
make sure the motor leads do not come into
contactwithanyuninsulatedmetalcomponents
of the unit.
For optimum system performance and comfort, it may
be necessary to change the factory set speed. Refer to
Tables 6, 7a, or 7b (page 14) for airflow data.To change
the blower speed:
1.Disconnect all electrical power to the unit and remove
the upper door.
2.Remove the black and red wires from the blower motor
jumping terminal. Discard the blower motor jumping
terminal.
3.Connect the heating speed wire (red) and the cooling
speedwire (black)tothedesired blowerspeedmarked
on the terminal block of the blower motor.
Standard 4-speed motors:
• Terminal2=Highspeed
• Terminal3=MediumHighspeed
• Terminal4=MediumLowspeed
• Terminal5=Lowspeed
4.Replace the upper door and secure it to the unit.
5.Restore power to the unit.
High Efficiency - Fixed Speed Units
IMPORTANT! This air handler has been designed to
give the installer maximum flexibility to optimize system
performance, efficiency, and comfort. Because there
are so many different ways to set up the air handler it is
important to read and follow these directions carefully.
B6BVairhandlersusehighefficiencycirculatingairmotors
Thefixedspeedmotorcontrolboard(Figure13,page17)
controls the torque output of the motor.
Before operation, the air handler must be configured to
matchtheunitwiththesystem,systemoptions,andclimatic
conditions. When configured, the air handler responds
directly to the thermostat inputs, as well as the optional
humidistat (see page 11). During normal operation, the
motor will gradually change speeds during start-up, shut
down,whenthermostatinputschange,andwhentheduct
static pressure changes (vents closed or opened, filter
clogging, etc.). The air handler is configured by setting
the selector switcheson the control board.
Selecting Basic Heating Airflow
Thefixedspeed motor control board(Figure 13)contains
asetofdipswitchesforsettingtheblowerspeed.Usepins
1 to 4 to set the blower speed for heating and pins 5 to 8
toset the speed forcooling.Todeterminethe appropriate
switchsettingsforyourinstallation,seeTable7b(page14)
NOTE:The minimum electric heat airflow setting may be
set higher, but must never be set lower than the setting
shown in Table 6 (page 14).
Selecting Basic Cooling / Heat Pump Airflow
Thebasiccooling/heat-pumpairflowiscontrolledbysetting
switches 5 - 8 on the thermostat input board (mounted
on the blower). All airflows for other modes of operation
(exceptelectricheat)aredeterminedbythisbasicsetting.
FAN ONLY would deliver 50% of the selected cooling
airflow. Table 7b (page 14) lists the basic airflow values
versus the airflow selector switch settings and ranges of
basic air flow settings.
• When operating in the heat pump mode, a higher
basic airflow setting will increase the energy efficiency
and capacity but will also decrease the supply air
temperature.
• For maximum capacityand energyefficiency,select an
airflow at or near the top of the range for that nominal
capacity.
• Formaximumdehumidification,selectanairflownearthe
middle or bottom of the range for that nominal capacity.

11
DHUM
RR
DHUM
HUMIDISTAT
MOTOR
CONTROL BOARD
Figure 5. DHUM Wiring Configuration
Additionalinformationonhumiditycontrolcanbefound
in the Humidistat and Delay Setting sections.
• For thermostats with a dehumidifier output, use a field
supplied wire to connect the thermostat’s dehumidifier
output to the terminal marked DHUM.The thermostat
should be set so that the DHUM output should be high
(positive) when dehumidification is needed. See also
Dehumidification Options section.
IMPORTANT! If coil icing is observed, the basic cooling/
heat-pump airflow selected may be too low. Verify the
setting selected is within the range shown inTables 7a or
7b(page 14) andthat thethe system isproperlycharged.
Please refer to the instructions supplied with the outdoor
unit.If icing continues to occur, raise the selected airflow
one or two steps.
Dehumidification Options
Themotorcontrolboard(Figure13,page17)hasaDHUM
connectionthatallowsthesystemtoincreasetheamount
of humidity that is removed from the circulating air.This
is accomplished by reducing the CFM and allowing the
cooling coil to become colder.This will only occur when
there is a call for cooling.There are many ways that this
can be electrically wired.
1.If the room thermostat incorporates a humidity sensor
andDHUMoutput,connecttheDHUMonthethermostat
to the DHUM terminal on the motor control board. See
Figure 5.
2.If using a separate humidistat, connect the DHUM & R
terminals on thehumidistat to theDHUM & Rterminals
on the motor control board of the air handler. In this
option, the DHUM output of the humidistat must be set
to be normally open and closed when there is a call for
humidification.
3.Ifahumidistatisnotavailable,itisanacceptableoption
to connect the R& DHUM terminals on the motor
control board together with a field supplied wire. This
option causes the blower to run at a reduced CFM for
10minutesafteracallforcooling.NOTE:Ifoutdoorunit
is a heat pump, connect the O terminal to DHUM.
UNIT MAINTENANCE
Propermaintenanceismostimportanttoachievethebest
performancefromaairhandler.Someofthecomponents
and their locations are shown in Figure 8 (page 12). If
any component of the air handler must be replaced, use
onlyfactoryauthorizedreplacementpartsspecifiedinthe
Replacement Parts List provided online.
WARNING:
ELECTRICAL SHOCK, FIRE OR EXPLOSION
HAZARD
Failure to follow safety warnings exactly could
result in serious injury or property damage.
Improper servicing could result in dangerous
operation, serious injury, death or property
damage.
•Beforeservicing,disconnectallelectricalpower
to air handler.
•Whenservicingcontrols,labelallwiresprior
to disconnecting. Reconnect wires correctly.
•Verifyproperoperationafterservicing.
• Thesemaintenanceinstructionsareprimarilyintended
toassistqualifiedtechniciansexperiencedintheproper
maintenance and operation of this appliance.
• Always reinstall the doors on the air handler after
servicingorcleaning/changingthefilters.Donotoperate
the air handler without all doors and covers in place.
• Verifythatthethermostatisproperlyinstalledandis
notbeing affectedbydraftsor heat fromlamps or other
appliances.
• To achieve the best performance and minimize
equipment failure, it is recommended that a yearly
maintenance checkup be performed. At a minimum,
this check should include the following items:
Air Filter(s)
WARNING:
Never operate the air handler without a filter in
place. Dust and lint in the return air can build
uponinternal components,resulting in loss of
efficiency,equipmentdamage,andpossiblefire.
B6BV series air handlers are not supplied with a single
airfilterwhenshippedfromthefactory.Itisrecommended
that the filter be cleaned or replaced monthly.Newly built
or recently renovated homes may require more frequent
changinguntil the constructiondust hasminimized.Filter
sizesshowninTable3areavailableatmostlocalretailers.
Filters designed to remove smaller particles such as
pollen, may require additional maintenance.
CABINET SIZE FILTER SIZE
A 12 x 20 x 1
B 18 x 20 x 1
C 20 x 20 x 1
Table 3. Filter Sizes

12
TROUBLESHOOTING
If the air handler fails to operate, check the following:
• Istheelectricturnedon?
• Isthethermostatoperatingproperly?
• Aretheblowercompartmentdoor(s)inplace?
• Istheairhandlerdisconnectclosed?
• Hasthecircuitbreakertrippedorthecontrolboardfuse
burnedopen?
• Areanymanualresetswitchesopen?
• Isthelterdirtyorplugged?
• IstheredLEDontheairhandlercontrolboardconstantly
ON?Ifnot,useTable6todeterminefaultcondition.
• IsthegreenandredLEDonthemotorcontrolboard
constantlyON?Ifnot,useTable7todeterminefault
condition.
RED LED DIAGNOSTIC
OFF Control Fault (No Power)
Flash Blower Fault
ON Normal Operation
Table 6. Air handler Control Board Fault Conditions
Blower Compartment
Dirt and lint can create excessive loads on the motor
resulting in higher than normal operating temperatures
and shortened service life. It is recommended that the
blower compartment be cleaned of dirt or lint that may
have accumulated in the compartment or on the blower
and motor as part of the annual inspection.
Blower Fan Wheel
Inspect the blower wheel blades for accumulations of dirt
andcleanifnecessary.Inspectmountingnutfortightness
when done.
Blower Motor & Assembly
Inspect the blower assembly and motor mounting
bracketsfortightnessand corrosion.Correct deficiencies
if necessary.The blower motor contains sealed bearings
and under normal operating conditions, no maintenance
is necessary for the life of the equipment.
Table 7. Motor Control Board Fault Conditions
DIAGNOSTIC GREEN
LED RED LED
Fixed
Speed
Furnaces
Control Fault (No Power) Off Off
Normal Operation On On
Motor Fault On Flash
Twin Fault (no motor fault) Flash On
Communications Fault Flash Flash
Motor
Mount Kit
Blower
Motor
Transformer
Capacitor
Circuit
Breaker (60A) Heating Element
Assembly
Blower
Wheel
Blower
Housing
Motor Control
Board
Control
Board
Filter
Door
Upper Door
Assembly
Lower Door
AssemblyFigure 8. B6BV Series Air Handler Components

13
FIGURES &TABLES
Figure 9. B6BV Series Air Handler Physical Dimensions
3/4”
3/4”
3/4”
13”
1 7/8" K.O.
11/8”K.O.
(typ.)
11/4”15/8”
17/8” 11/4”
3 1/4”
2 5/8” 11/8”K.O.
(typ.)
13/4”K.O.
(typ.)
1 7/8”
3 5/8”
5 5/8”
DETAIL“D”
3 1/4”
2 1/4”
15 1/4”13”
SUCTION
LIQUID
“W”
1 1/8”
1 7/8”
7/8" K.O.
“H”
22"
“A”
Cabinet Size H W A Detail D
Tall B 49-5/16 19-11/16 18-1/4 No
C 55-15/16 22-7/16 21 Yes

14
AIRFLOW DATA
Model Nominal
Blower Size Nominal Motor Size Number of Speeds Ext. Static Pressure (inW.C.) Low Medium Low Medium High High
B6BV
B - Cabinet 10 x 8 1/3 hp 4-sp
0.1 800 1090 1265 1405
0.2 780 1080 1255 1395
0.3 760 1060 1240 1375
0.4 740 1095 1215 1350
0.5 715 1020 1190 1310
NOTES:
1) Airflow is shown in cfm, +/- 5%.
2) All airflows are measured without filter and with dry coil.For filter velocity of 300 ft./min. subtract .08” external static pressure. For wet coil, subtract .1” external static pressure.
3) See unit nameplate or installation instructions for maximum recommended external static pressure.
Table 7a. Airflow Data for B-Size Cabinets
B6BV
C - cabinet
Switch Setting Cooling or Heating Airflow (CFM)
Dry Coil ESP
1/5 2/6 3/7 4/8 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
0 0 0 0 710 580 395
1 0 0 0 830 690 675 530 505
0 1 0 0 930 875 710 665 560 530
1 1 0 0 1065 1015 900 840 800 705 665 635
0 0 1 0 1185 1115 1010 960 925 875 830 745
1 0 1 0 1275 1220 1175 1120 1060 970 930 890
0 1 1 0 1365 1350 1255 1200 1150 1105 1060 1025
1 1 1 0 1480 1430 1370 1325 1265 1225 1185 1140
0 0 0 1 1560 1535 1485 1430 1375 1335 1285 1240
1 0 0 1 1650 1600 1545 1500 1450 1405 1360 1305
0 1 0 1 1730 1685 1660 1610 1570 1520 1470 1420
1 1 0 1 1785 1740 1695 1645 1615 1545 1510 1470
0 0 1 1 1865 1820 1785 1750 1695 1655 1605 1560
1 0 1 1 1920 1890 1850 1805 1765 1715 1675 1640
0 1 1 1 2010 1965 1960 1900 1850 1810 1775 1730
1 1 1 1 2065 2020 1985 1955 1915 1880 1840 1810
NOTE:0=OFF,1=ON
Table 7b. Airflow Data for C-Size Cabinets
Cabinet Nominal Electic Heat KW
5 8 10 15 20 25 30
C 1000 1100 1200 1400 1600 1800 2000
Table 6. Minimum Heating Airflow Settings (in CFM)
for B6BV (FSHE) Air Handlers

15
ELECTRICAL DIAGRAMS & DATA
Table 8. B6BV Minimum Circuit Ampacity & Maximum Overcurrent Protection
B6BV
CABINET CAPACITY
HEAT KIT
MODEL
NUMBER
H6HK-
240VAC, 50 & 60 HZ, SINGLE PHASE 208VAC, 50 & 60 HZ, SINGLE PHASE
MCA MOP MCA MOP
CIRCUIT
A
CIRCUIT
B
CIRCUIT
C
SINGLE
CIRCUIT CIRCUIT
A
CIRCUIT
B
CIRCUIT
C
SINGLE
CIRCUIT CIRCUIT
A
CIRCUIT
B
CIRCUIT
C
SINGLE
CIRCUIT CIRCUIT
A
CIRCUIT
B
CIRCUIT
C
SINGLE
CIRCUIT
B- 10 KW 53.6 - - 53.6 60 - - 60 47.0 - - 47.0 50 - - 50
- 15 KW 56.6 25.0 - 78.6 60 30 - 80 47.0 21.7 - 68.6 50 25 - 70
C- 10 KW 56.3 - - 56.3 60 - - 60 50.1 - - 50.1 60 - - 60
- 20 KW 56.3 50.0 - 106.3 60 60 - 110 50.1 43.3 - 93.4 60 45 - 100
Figure 10.TypicalThermostat Connections
GRCW/EO Y
Thermostat
GR
W
Thermostat
Y
C
Y
GR
W
Thermostat
Y
C
Air
Handler
Air
Conditioner
Y
Typical Air Conditioner with
Standard Air Handler
GRCE
OY
Thermostat
Typical Heat Pump with
Standard Air Handler
Typical Air Conditioner with
Variable Speed Air Handler
Typical Heat Pump with
Variable Speed Air Handler
GR
W2 C
O
Y1
Thermostat
O
Y1
R
C
GR
W/E
Thermostat
Y1
C
Y1
W2
Typical 2-Stage Air Conditioner
withVariable Speed Air Handler
Typical 2-Stage Heat Pump with
Variable Speed Air Handler
Y2
Y2
Y2
Y2 OUT
W/E
R
Air
Conditioner
Air
Handler
Air
Conditioner
Air
Handler
Heat Pump
Air
Handler
Heat Pump
O
R
C
Y
Air
Handler
Heat Pump
NOTE: Jumper between
W2 & E is required when
no OD T-Stat is used.
W1
Y
G
R
C
NOTE: Jumper W1 & W2
together if not using W2
on thermostat
Y1
W2
W1
O
Y/Y2
G
R
C
Y1
W2
W1
O
Y/Y2
G
R
C
W2
Air
Handler
W1
Y
G
R
C
R
C
Y
W2
O
Y1
W2
W1
O
Y/Y2
G
R
C
Y1
W2
W1
O
Y/Y2
G
R
C
W2
W2
W2
NOTE: Jumper W1 & W2
together if not using W2
on thermostat

16
LED 1
BLWDTC
BLWDTC_R
HEAT
COOL
EAC
L 1
L 2
P2
RC G WY
3A Fuse
HEATER P1
CRGY2/Y O1W 2W 1YL
LED 1
HEATER P1
L 2HUM
EAC
P2
3A Fuse
P3
Figure 11. Single Stage Control Board
Figure 12.Two - Stage Control Board

17
GREEN
RED
STATUS
NOT USED
TEST PORT
BLOWER MOTOR
RCY1
TWIN DEHUM
W1
EXPANSION
PORT
COOL
HEAT
FAN SPEED
12345 6 7 8
OFF ON
Figure 13.Two-Stage Fixed Speed Motor Control Board
CONTROL SIGNAL & MODE OPERATION TOTAL KW BOARD ACTION
W1 only
EHEAT
ON
5 KW Stage 1 Heat on instantly
Heat blower on after 3 second delay
10 KW Stage 1 Heat on instantly
Heat blower on after 3 second delay
15 KW Stage 1 Heat on instantly Heat blower on after 3 second delay
Stage 2 Heat on after 5 second delay
20 KW
Stage 1 Heat on instantly
Heat blower on after 3 second delay
Stage 2 Heat on after 5 second delay
Stage 3 Heat on after 10 second delay
25 KW
Stage 1 Heat on instantly
Heat blower on after 3 second delay
Stage 2 Heat on after 5 second delay
Stage 3 Heat on after 10 second delay
30 KW
Stage 1Heat on instantly
Heat blower on after 3 second delay
Stage 2 Heat on after 5 second delay
Stage 3 Heat on after 10 second delay
Stage 4 Heat on after 15 second delay
OFF Heat stages off instantly
Blower off after 15 second delay
Table 9. Heating Element Logic for B6BV Air Handlers

18
CONTROL SIGNAL & MODE OPERATION TOTAL KW BOARD ACTION
W1 & W2
EHEAT
ON
5 KW Stage 1 Heat on instantly
Heat blower on after 3 second delay
10 KW Stage 1 Heat on instantly Heat blower on after 3 second delay
Stage 2 Heat on after 5 seconds delay
15 KW
Stage 1 Heat on instantly
Heat blower on after 3 second delay
Stage 2 Heat on after 5 seconds delay
Stage 3 Heat on after 10 seconds delay
20 KW
Stage 1 Heat on instantly
Heat blower on after 3 second delay
Stage 2 Heat on after 5 seconds delay
Stage 3 Heat on after 10 seconds delay
Stage 4 Heat on after 15 seconds delay
25 KW
Stage 1 Heat on instantly
Heat blower on after 3 second delay
Stage 2 Heat on after 5 seconds delay
Stage 3 Heat on after 10 seconds delay
Stage 4 Heat on after 15 seconds delay
Stage 5 Heat on after 20 seconds delay
30 KW
Stage 1Heat on instantly
Heat blower on after 3 second delay
Stage 2 Heat on after 5 seconds delay
Stage 3 Heat on after 10 seconds delay
Stage 4 Heat on after 15 seconds delay
Stage 5 Heat on after 20 seconds delay
Stage 6 Heat on after 25 seconds delay
OFF Heat stages off instantly
Blower off after 15 second delay
W1 &Y/Y2
AUX HEAT
ON
5 KW Stage 1 Heat on instantly
Cool blower on after 3 second delay
10 KW Stage 1 Heat on instantly
Cool blower on after 3 second delay
15 KW Stage 1 Heat on instantly Cool blower on after 3 second delay
Stage 2 Heat on after 5 seconds delay
20 KW
Stage 1 Heat on instantly
Cool blower on after 3 second delay
Stage 2 Heat on after 5 seconds delay
Stage 3 Heat on after 10 seconds delay
25 KW
Stage 1 Heat on instantly
Cool blower on after 3 second delay
Stage 2 Heat on after 5 seconds delay
Stage 3 Heat on after 10 seconds delay
30 KW
Stage 1 Heat on instantly
Cool blower on after 3 second delay
Stage 2 Heat on after 5 seconds delay
Stage 3 Heat on after 10 seconds delay
Stage 4 Heat on after 15 seconds delay
OFF Heat stages off instantly
Heat blower turns off after 40 second delay
Table 9. Heating Element Logic for B6BV Air Handlers - Continued

19
CONTROL SIGNAL & MODE OPERATION TOTAL KW BOARD ACTION
W1, W2 &Y/Y2
AUX HEAT
ON
5 KW Stage 1 Heat on instantly
Cool blower on after 3 second delay
10 KW Stage 1 Heat on instantly Cool blower on after 3 second delay
Stage 2 Heat on after 5 seconds delay
15 KW
Stage 1 Heat on instantly
Cool blower on after 3 second delay
Stage 2 Heat on after 5 seconds delay
Stage 3 Heat on after 30 seconds delay
20 KW
Stage 1 Heat on instantly
Cool blower on after 3 second delay
Stage 2 Heat on after 5 seconds delay
Stage 3 Heat on after 10 seconds delay
Stage 4 Heat on after 15 seconds delay
25 KW
Stage 1Heat on instantly
Cool blower on after 3 second delay
Stage 2 Heat on after 5 seconds delay
Stage 3 Heat on after 10 seconds delay
Stage 4 Heat on after 15 seconds delay
Stage 5 Heat on after 20 seconds delay
30 KW
Stage 1Heat on instantly
Cool blower on after 3 second delay
Stage 2 Heat on after 5 seconds delay
Stage 3 Heat on after 10 seconds delay
Stage 4 Heat on after 15 seconds delay
Stage 5 Heat on after 20 seconds delay
Stage 6 Heat on after 25 seconds delay
OFF Heat stages off instantly
Heat blower turns off after 40 second delay
G
FAN On Fan blower on after 3 second delay
Off Fan blower off instantly
Y/Y2
HEAT PUMP & COOL On Cool blower on after 3 second delay
Off Cool blower off after 40 second delay
Y1
HEAT PUMP & COOL On Cool blower on after 3 second delay
Off Cool blower off after 40 second delay
Y1 &Y/Y2
HEAT PUMP & COOL On Cool blower on after 3 second delay
Off Cool blower off after 40 second delay
Table 9. Heating Element Logic for B6BV Air Handlers - Continued

20
Figure 14.Wiring Diagram for B6BV Series Air Handler Equipped With
PSC Motor & 10 kw Heater Kit (B Size Cabinet Only)
WIRING DIAGRAM
7110790
Air Handler with Factory Installed Heat (10kW)
Legend
Field Wiring
Factory Wiring:
LowVoltage High Voltage
¢711079:¤
0510
GRAY
TERMINAL BLOCK (for select models only)
CIRCUIT BREAKER (circuit breaker models only)
CAP.
1 3 5 2 4 6
HEATER PLUG
BLW DTC
RELAY
RELAY
Y
L2
L1
EAC
COOL
HEAT
WGR
C
R C L2 L1
R
-
7 6 5 4 3 2 1
240
24 V
208COM
TRANSFORMER
RC
BLACK
RED
WHITE
BROWN
BLACK
WHITE
RED
GRAY
BLACK
ELEMENT
BLACK
GREY
BLACK
POWER
PLUG
LIMIT
RED
RED
RED
RED
RED
BLACK
RELAY
RELAY
ELEMENT
BLACK
BLACK
SUPPLY VOLTAGE
GRAY
ORANGE
BLUE
HARNESS
BROWN
GROUND
BLACK
RED
LOCATION OF “T” CONNECTOR
MOTOR
4-SPEED
BLOWER
MOTOR
PLUG
6 5 4
3 2 1
1 = COM 2 = HIGH 3 = MED HIGH 4 = MED LOW 5 = LOW 6 = OPEN
NOTES: 1.The blower motor speed tap connection may not be as shown. See the Installation Instructions. 2. Disconnect all power before servicing. 3.Transformer may have a dual voltage primary tap. Match the tap position with the supply voltage used. 4. If the internal wiring is replaced, use only 105°C copper wire of the same gauge.