Nortek iq Drive Series User manual

AIR HANDLER
Please read all information in this manual thoroughly and become familiar with the capabilities
anduseofyourappliancebeforeattemptingtooperateormaintainthisunit.Theseinstructions
are primarily intended to assist qualified individuals experienced in the proper installation
of this appliance. Installer should be specifically trained to install and setup an iQ system.
Some local codes require licensed installation / service personnel for this type of equipment.
Improperinstallation,service,adjustment,ormaintenancemaycauseexplosion,fire,electrical
shock or other hazardous conditions which may result in personal injury or property damage.
Unless otherwise noted in these instructions, only factory authorized kits or accessories may
be used with this product.Keep this manual where you have easy access to it in the future.If a
problemoccurs,checktheinstructionsandfollowrecommendationsgiven.Ifthesesuggestions
don’t eliminate your problem, call your servicing contractor.
DO NOT DESTROY. PLEASE READ CAREFULLY AND
KEEP IN A SAFE PLACE FOR FUTURE REFERENCE.
IMPORTANT
B4VM-E
INSTALLATION INSTRUCTIONS
Series

2
TABLE OF CONTENTS
Important Safety Information ....................................2
Requirements & Codes..............................................3
General Information ...................................................4
BeforeYou Install this Unit.........................................4
Locating the Air Handler............................................4
Minimum Clearances.................................................4
Operation of Air Handler During Construction...........4
Installation in a Garage .............................................5
Plenums & Air Ducts .................................................5
Unconditioned Spaces...........................................5
Air Filters................................................................5
Acoustical Duct Work.............................................5
Air Handler Installation..............................................6
Packaging Removal...................................................6
Mounting Applications...............................................6
Upflow Installations ...................................................6
Downflow Installations...............................................6
Horizontal Installations..............................................7
Horizontal Left Installations....................................7
Horizontal Right Installations .................................7
Refrigerant Line Connections....................................8
Connecting the Linesets ........................................9
Condensate Drainage ..............................................9
Electrical Connections...............................................9
Pre-Electrical Checklist ...........................................10
Line Voltage.............................................................10
Grounding................................................................10
Thermostat Connections.........................................10
Control Board..........................................................10
Twinning...............................................................10
Heater Kits...............................................................10
Electronic Air Cleaner..............................................10
Startup & Adjustments ............................................12
BeforeYou Start the Unit.........................................12
Refrigerant Charging...............................................12
Air Circulation..........................................................12
Running the Blower Continuously........................12
Turning the Blower Off..........................................12
System Cooling....................................................12
System Heating....................................................12
Blower Settings .......................................................13
Dehumidification......................................................13
Unit Maintenance......................................................13
Troubleshooting........................................................13
Figures &Tables .......................................................14
Table 3.B4BM Physical Dimensions....................14
Figure 9. Air Handler Components.......................15
Figure 10. X13 Motor Control Board ....................16
Figure 11. EXV Control Board..............................16
Figure 12. B4VM-E Wiring Diagram.....................17
Installation / Performance Checklist.......................20
IMPORTANT SAFETY INFORMATION
INSTALLER:Pleasereadallinstructionsbeforeservicing
this equipment. Pay attention to all safety warnings and
any other special notes highlighted in the manual.Safety
markings are used frequently throughout this manual to
designateadegreeorlevelofseriousnessandshouldnot
be ignored.WARNING indicates a potentially hazardous
situationthatifnotavoided,couldresultinpersonalinjury
or death. CAUTION indicates a potentially hazardous
situationthatifnotavoided,mayresultinminorormoderate
injury or property damage.
WARNING:
B4VM-E Series Air Handlers leave the factory
with a nitrogen holding charge. Use caution
when preparing coils for field connections.
If repairs make it necessary for evacuation
and charging, it should only be attempted
by qualified, trained personnel thoroughly
familiarwith this equipment.Some localcodes
require licensed installation service personnel
to service this type of equipment. Under no
circumstances should the equipment owner
attempttoinstalland/orservicethisequipment.
Failuretocomplywiththiswarningcouldresult
inequipmentdamage,personalinjury,ordeath.
NITROGEN
HEALTH
FLAMMABILITY
REACTIVITY
0 Minimal Hazard 1 Slight Hazard
1
0
0
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.

3
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 by qualified trained
personnel thoroughly familiar with this type equipment.
• Allelectricalwiringmustbecompletedinaccordance
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.
• 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 performing brazing
operations.
• Installthisunitonlyinalocationandpositionasspecied
on pages 4 & 5. This unit is designed only for Indoor
installations and should be located with consideration
of minimizing the length of the supply and return ducts.
• 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.
• This air handler may be used for temporary heating
of buildings or structures under construction. See the
guidelines listed on page 4.
• Airhandlerinstallationsinaresidentialgaragemustbe
installed as specified on page 5.
The information listed below is for reference purposes only
anddoesnotnecessarilyhavejurisdictionoverlocalorstate
codes.Alwaysconsultwithlocal authoritiesbeforeinstalling
any gas appliance.
Duct Systems
• USandCANADA:AirConditioningContractorsAssociation
(ACCA) Manual D, Sheet Metal and Air Conditioning
ContractorsNationalAssociation(SMACNA),orAmerican
Society of Heating, Refrigeration, and Air Conditioning
Engineers (ASHRAE) Fundamentals Handbook
Electrical Connections
• US:NationalElectricalCode(NEC)ANSI/NFPA70
• CANADA:CanadianElectricalCodeCSAC22.1
Safety
• US: (NFGC) NFPA 54–1999/ANSI Z223.1 and the
Installation Standards, Warm Air Heating and Air
Conditioning Systems ANSI/NFPA 90B.
• CANADA: CAN/CGA-B149.1 and .2–M00 National
Standard of Canada. (NSCNGPIC)

4
GENERAL INFORMATION
Thisappliancehasbeentestedforcapacityandefficiency
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 create unsafe hazards.Please read
all instructions before installing the unit.
BeforeYou Install this Unit
√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.
√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.
√Checktheelectricalsupply andverifythepowersupply
isadequateforunitoperation.Thesystemmustbewired
and provided with circuit protection in accordance with
localbuildingcodes.Ifthereisanyquestionconcerning
the power supply, contact the local power company.
√Verify the static pressure drop of the coil, filter, and
duct work do not exceed the air delivery specs of the
air handler.
Figure 1. Minimum Unit Clearances
INSTALLATION CLEARANCES
Left Side......... 0 Inches Right Side...... 0 Inches
Back...............0 Inches Front........... †See Notes
†
NOTES:
Alcove Installations - Allow 24 in. minimum clearance
fromfrontofunittonearestwallorpartitionforservicing.
Recommended clearance is 36 in.
Closetinstallations - require a return airgrill installed in
thedoororapartiallylouvereddooracrosstheopening
forproperaircirculation.Forclearances6”orgreater,the
closetmusthaveanopenfreeareaof235in2minimum.
For special clearances between 1” - 5”, requirements
are a louvered door with a minimum of 250 in2(1613
cm2) free area. A fully louvered closet door is strongly
recommended for both installation types.
REAR
RIGHT
SIDE
LEFT
SIDE
FRONT
Locating the Air Handler
• Surveythejobsitetodeterminethebestlocationfor
mounting the unit. Consideration should be given to
availabilityofelectricpower,service access,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 Figure 1. Physical
dimensions for this air handler are also shown inTable
3 (page 14).
• Theairhandlershouldbeinstalledbeforeroutingthe
refrigerant tubing.
Minimum Clearances
• This appliance must be installed in accordance with
clearances listed in Figure 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.
• Sufcientclearanceforunobstructedairowthrougha
louvered door must be maintained in order to achieve
rated performance.
Operation of Air Handler During Construction
CAUTION:
Failuretofollowtheseinstructionswillvoidthe
factory warranty and may significantly reduce
the life or the performance of the air handler,
and/or result in other unsafe conditions. It is
the responsibility of the installing contractor
to insure these provisions are met.
Operating an air handler in a construction environment
can cause the appliance a variety of problems. Proper
use of commercial portable space heating equipment
during construction is recommended. This air handler
may be used during construction if it is not in violation of
any applicable codes and the following criteria are met:
• The installation must meet all applicable codes and
be permanently installed according to the instructions
supplied with the air handler. This includes electrical
supply, gas supply, and duct work.
• Theairhandlermustbecontrolledbyaproperlyinstalled
thermostat that complies with the current provisions
of the NEC (ANSI/NFPA 70) and all applicable codes
having jurisdiction. Thermostat connections must be
made in accordance with instructions supplied with the
air handler and thermostat. See page 10.
• Theinstallationmustincludeaproperlyinstalledlterin
thereturn air system with no by-passair.Thefiltermust
be inspected frequently and replaced when necessary.
• Returnairmustbesuppliedunrestrictedandlocated
such that dust and gases from construction activity are
not introduced into the circulating air system.
• Before occupying the structure: The lter must be
replaced or cleaned, the duct work must be inspected
and cleaned of any construction debris, and the air

5
handler must be cleaned and/or repaired if found to
be dirty, damaged, or malfunctioning in any way by
a qualified HVAC technician. The air handler shall be
inspected and approved by applicable local authority
even if this requires redundant inspections.
• The serial number for the air handler used during
construction must be submitted in writing (fax and
email also acceptable).This information will be used to
track the long-term affects of air handler usage during
construction.Proofofthissubmittalshallbeavailablefor
thefinalinspectionoftheairhandlerpriortooccupancy.
Installation in a Garage
WARNING:
Donotplacecombustiblematerialsonoragainst
the cabinet. Do not place flammable materials,
(gasoline, paint thinners, etc.) or any other
flammable vapors and liquids, in the vicinity
of the air handler.
The B4VM-E Series air handler may be installed in a
residential garage with the provision that the unit must
be located or protected to prevent physical damage by
vehicles.
ducts should be appropriately sized to the capacity of
the air handler to ensure its proper airflow rating.
• 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shouldbeusedbetweentheunit
and the ductwork to prevent transmission of vibration
from the unit to the structure. If electric heater kits are
installed, 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.
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.
Air Filters
B4VM-E Series Air Handlers are not supplied with an air
filter when shipped from the factory. The installer must
provide a high velocity filter that is appropriately sized
to the return air duct opening or filter rack located in the
bottom of the unit. Accessing the filter does not require
tools and can be removed from the front of the unit by
removing the filter 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
up on internal components,resulting in loss of
efficiency,equipmentdamage,andpossiblefire.
Acoustical Duct Work
• Certain installations may require the use of acoustical
lininginsidethesupply 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-stylefiltersonthereturnairinletoftheairhandler
may be used to reduce the transmission of equipment
Plenums & Air Ducts
• Plenumsandairductsshouldbeinstalledinaccordance
with the standards of the National Fire Protection
AssociationStandardforInstallationofAirConditioning
Systems (NFPA 90A), Standard for Installation of
ResidenceTypeWarmAirHeatingandAirConditioning
Systems (NFPA 90B), and all applicable local codes.
• NFPA publications are available by writing to: National
FireProtectionAssociation,BatterymarchPark,Quincy,
ME 02269 or visit www.NFPA.org online.
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.
Returnair and 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.
• Designtheductworkaccordingtomethodsdescribed
bytheAirConditioningContractorsofAmerica(ACCA).
• Thisunitisdesignedonlyforusewithareturnandsupply
duct.The return air duct must have the same free area
as the opening provided on the blower coil unit. The

6
AIR HANDLER INSTALLATION
The B4VM-E Series Air Handler is shipped ready for
vertical upflow installation and is approved for attic,
basement, alcove/closet or crawlspace installation with
zero clearance to combustibles. See Figure 1 (page 4)
for required installation clearances. This appliance is
only for indoor use.
• 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.
Packaging Removal
Remove the shipping crate and User’s Manual from the
equipment.When removing the crate, use extra care so
tubing connectios are not damaged.
Mounting Applications
Vertical only air handlers are factory ready for upflow
applications. These units may be applied in downflow
or horizontal left and right discharge applications when
applied with the appropriate field kit.
Factory ready horizontal air handlers may be applied in
upfloworhorizontal-leftand-rightdischargeapplications.
These units may also be applied in downflow discharge
when applied with the appropriate field kit as specified in
the units Technical Specifications.
Through-the-floor installations require a 1/4” thick
noncombustible resilient gaskettobe used whenever the
supplyorreturnairductspassthroughthefloor.Thegasket
should be positioned between the duct, unit, and floor.
Upflow Installations
All air handlers are factory shipped, ready for upflow
installation.The horizontal drain pan should be removed
from the air handler when installing the unit in an upflow
configuration.All return air must enter from the bottom of
the unit. A typical upflow unit is shown in Figure 2.
Downflow Installations
Thedownflowaccessorykit(SeeTechnicalSpecifications)
is required for downflow applications. Instructions for
installingthedownflowaccessorykitareincludedwiththe
kit.Itisrecommendedthattheaccessorybeinstalledprior
toinstallingtheunit.Allreturnairindownflowapplications
mustenterthroughthetopoftheunit.Atypicalinstallation
of the unit in a downflow application is shown in Figure 3.
Figure 2. Upflow Installation
Horizontal
Drain Pan
Return
Air
Figure 3. Downflow Installation
Tube
Close-off
Plate
Coil
Cabinet
Adaptor Kit
noise eminating from the air handler.These treatments
can produce a quieter installation, particularly in the
heatedspace.However,theycanincreasethepressure
dropintheductsystem.Caremustbetakentomaintain
the proper maximum pressure differential across the
air handler, temperature rise and flow rate. This may
mean increasing the duct size and/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.

7
Figure 5. Unit Horizontally Suspended
Threaded
Rod
Lag
Bolt
Nuts (x2)
Washer
and
Lockwasher
Nuts (x2)
Horizontal Installations
TheB4VM-ESeriesairhandlercanbeinstalledhorizontally
inanattic,basement,crawlspaceoralcove.Itcanalsobe
suspended from a ceiling in a basement or utility room in
either a right to left airflow or left to right airflow as shown
in Figure 4.Air handlers may or may not be shipped from
the factory with all the parts required for horizontal left
applications and horizontal right applications.If your unit
does not have parts for a horizontal application, a kit is
available.
NOTE: In all horizontal applications in which the unit is
installed above a finished ceiling and/or living space, a
secondarydrainpanmustbeinstalledundertheentireunit
to avoid damage to the ceiling in the event of condensate
overflow.Additionally,itisrecommendedthatanapproved
water level indicator or float switch device be used to
shut down the unit in the event water is detected in the
auxiliary drain pan.
If suspending the air handler from the ceiling, assemble
asupport frame (Figure 5) using slottediron channel and
full threaded rod. Fasten the frame together with nuts,
washers, and lockwashers. Secure the support frame
to the rafters with lag bolts.The air handler can also be
suspended using steel straps around each end of the
unit.Thestrapsshould be attached to the air handler with
sheet metal screws and to the rafters with bolts.
Horizontal Left Installations:
1.Remove the coil access door.
2.Remove the plug from one of the threaded holes in the
horizontal drain pan. Completely remove the webbing
located in the threaded holes of the horizontal drain
pan. IMPORTANT: If the webbing is not removed, the
condensate will not drain properly and ceiling damage
may occur.
3.Inserttheplug (fromhorizontaldrainpan)intotheopen
and unused drain hole in the drain pan at the bottom
of the unit to block bypass air.
4.Remove the corresponding drain line knockout from
the coil access door to allow access to the horizontal
drain.
5.Replace the door and attach the drain line.
Horizontal Right Installations:
The unit may also be installed in a horizontal application
with the unit suspended from the ceiling. A typical
installationoftheunitinasuspendedhorizontalapplication
is shown in Figure 5.
1.Removethecoilaccessdoor.Unscrewtheline-settube
close-off plate from the front left cabinet rail.
2.Slide the coil and drain pan assembly out of the unit.
3.Remove the sheet metal hairpin covers (if supplied)
from the back of the coil and discard.
4.Place the horizontal drain pan on the opposite side of
the coil.On units with 2 sets of knockouts, remove the
other set of knockouts in the coil spacing plates and
insert support rod.
5.Slide the coil and the horizontal drain pan assembly
back into the unit.Re-attach the tube close off plate.
6.Remove the plug from one of the threaded holes
in the horizontal drain pan. Completely remove the
webbing located in the threaded holes of the drain
pan. IMPORTANT: If the webbing is not removed, the
condensate will not drain properly and ceiling damage
may occur.
7.Inserttheplug (fromhorizontaldrainpan)intotheopen
and unused drain hole in the drain pan at the bottom
of the unit to block bypass air.
8.Remove the corresponding drain line knockout from
the coil access door to allow access to the horizontal
drain.
9.Replace the door and attach the drain line.
Figure 4. Horizontal Configurations
HORIZONTAL RIGHT
HORIZONTAL LEFT
RETURN
AIR
RETURN
AIR

8
CAUTION:
Beforebrazing theair handler,removethe core
from the service port. Failure to comply may
result in leakage at the service valve. Replace
the core and cap once brazing is complete.
• B4VM-ESeriesairhandlersarechargedthroughservice
valves on the end of the liquid tube for each circuit.
These must be removed before brazing the line sets.
Refrigerant Line Connections
WARNING:
Thecoilintheairhandlerisfactoryshippedwith
a nitrogen charge. Avoid direct face exposure
or contact with valve when gas is escaping.
Always ensure adequate ventilation is present
during the depressurization process.Address
any uncertainties before proceeding. Failure
to comply with this warning could result in
equipment damage, personal injury, or death.
NITROGEN
HEALTH
FLAMMABILITY
REACTIVITY
0 Minimal Hazard 1 Slight Hazard
1
0
0
CAUTION:
This unit uses refrigerant R-410A.DO NOT use
anyotherrefrigerantinthisunit.Useofanother
refrigerant will damage the unit.
• Theinstallershouldmakeevery effort to ensure the
field installed refrigerant containing components of the
system have been installed in accordance with these
instructions andsoundinstallation practicesforreliable
system operation and longevity.
• Theairhandlercoildoesnotcontainarefrigerantcharge.
Refer to the installation instructions supplied with the
outdoor unit for refrigerant charge information.
• Alwaysrefertotheinstallationinstructionssuppliedwith
the outdoor unit for piping requirements. The suction
and liquid lines must be sized in accordance with the
condensing unit specifications. See Table 3 (page 14)
for liquid and suction line locations.
• When connecting refrigerant linesets together, it is
recommended that dry nitrogen be flowing through the
jointsduringbrazing.Thiswillpreventinternaloxidation
and scaling from occurring.
• Refrigeranttubingshouldberoutedinamannerthat
minimizesthelengthoftubingandthenumberofbends
in the tubing. It should be supported in a manner that
prevents it from vibrating or abrading during system
operation.Tubingshouldbekeptcleanofforeigndebris
during installation.
• Ifpreciseformingofrefrigerantlinesisrequired,acopper
tubingbenderisrecommended.Avoidsharpbendsand
contact of the refrigerant lines with metal surfaces.
• Refrigerant lines should be wrapped with pressure
sensitive neoprene or other suitable material where
they pass against sharp sheet metal edges.
Connecting the Linesets
1.Remove grommets from line set holes.
CAUTION:
To protect the Thermistor and EXV, it is
recommended that a wet rag be wrapped
around the suction line in front of the close
off plate before applying heat. Failure to keep
components cool during brazing may result
in structural damage, premature equipment
failure, or possible personal injury.
2.Unbraze and remove the cap on the suction line.
3.Route and cut both lineset tubes to proper length in
accordance with the outdoor unit specifications.Verify
the ends are round, clean, and free of any burrs.
4.Positiongrommetonlinesetwithsufficientdistanceaway
frombrazingarea.Brazingprocessescanpermanently
damage grommets.
5.Connect the suction and liquid lineset tubes.
CAUTION:
To protect the Thermistor and EXV, it is
recommended that a wet rag be wrapped
around the suction line in front of the close
off plate before applying heat. Failure to keep
components cool during brazing may result
in structural damage, premature equipment
failure, or possible personal injury.
6.Braze the individual connections with dry nitrogen
flowing through the joints. NOTE: This will prevent
internal oxidation and scaling from occurring.
7.Wrap the refrigerant lines with pressure sensitive
neoprene or other suitable material especially where
the lines enter the opening in the sheet metal.
8.Evacuatethesystemofmoistureandnon-condensables
to prevent low efficiency operation or damage to the
unit. The suggested range of evacuation is 250 - 500
microns.

9
a minimum diameter of 3/4”and be trapped separately.
IMPORTANT: Failure to install a trap may result in
condensation overflowing the drain pan, resulting in
substantial water damage to surrounding area.
• Routebothlinestoasuitabledrain,avoidingsharpbends
and pinching of the lines.The drain should maintain a
minimum horizontal slope in the direction of discharge
of not less than 1” vertical for every 10 ft of horizontal
run.
• Iftheairhandlerislocatedinorabovealivingspace
where damage may result from condensate overflow,
an auxiliary drain pan shall be installed under the unit.
A separate drain line should extend from the pan to a
conspicuous point and serve as an alarm indicating
that the primary drain is restricted.As an alternative to
a separate drain line, an approved water level indicator
or float switch device should be used to shut down the
unit in the event water is detected in the auxiliary pan.
• Installasingle5inchtrapinthecondensatedrainline
as close to the coil as possible. Make sure that the
top of the trap is below the bottom of the drain pan to
preventthe condensatefrom overflowingthedrainpan.
NOTE: There must be only one trap in the drain line.
Using more than one trap may prevent drainage.
• Primethetrapwithwater.Insulatethedrainifitislocated
inanunconditionedspace,andtestthecondensateline
for leaks.Consult local codes for additional restrictions
or precautions.
• During system checkout, inspect the drain line and
connections to verify proper condensate drainage.
9.Charge the system with refrigerant. Refer to the
outdoor unit installation manual for additional charging
instructions.
10.Check the system for leaks, including the lineset and
the brazed joints. NOTE: Apply a soap and water
solutiononeachjointorunionwithasmallpaintbrush.If
bubblingisobserved,theconnectionisnotadequately
sealed.
11.Replace all grommets and properly dispose of all
removed parts.
Condensate Drainage
CAUTION:
The air handler must be level to ensure proper
condensate drainage. An unlevel installation
may result in structural damage, premature
equipment failure, or possible personal injury.
• Methodsfordisposingofcondensate vary according
to local codes.Refer to local codes or authority having
jurisidiction for restrictions and proper condensate
disposal requirements.
• The drain pan that is supplied with this air handler
contains a primary and secondary drain fitting. The
condensate is drained from the unit through two 3/4”
female pipe fittings located on the front side of the unit
as shown in Figure 6.
• ThedrainpanMUSTbedrainedwitheldsuppliedtubing
and looped to form a trap. Both drain tubes must have
3/4” Adapter w/
3/4” dia. hose barb
3/4” minimum dia.
PVC or flexible tubing
HORIZONTAL
UPFLOW
DOWNFLOW
NOTES:
1.The drain lines must maintain a downward slope to ensure proper
condensate drainage.
2. Each condensate drain must be trapped separately using a J-Trap or
field supplied loop.
Figure 6. Condensate Drainage
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 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).

10
Pre-Electrical Checklist
√Verify the voltage, frequency, and phase of the supply
sourcematchthespecificationsonthe unit rating plate.
√Verifythat theserviceprovidedbytheutility is sufficient
tohandletheadditionalloadimposedbythisequipment.
√Verify factory wiring is in accordance with the unit
wiring diagram (Figure 12, page 17).Verify none of the
connections loosened during shipping or installation.
LineVoltage
• An electrical disconnect must be located within
sightofandreadilyaccessibletotheunit.Thisswitch
shall be capable of electrically de-energizing the unit.
Seeunit data labelforproperincoming fieldwiring.Any
other wiring methods must be acceptable to authority
having jurisdiction.
• Itisrecommendedthatthelinevoltagetotheunitbe
supplied from a dedicated branch circuit containing the
correct fuse or circuit breaker for the unit.
• Overcurrentprotectionmustbeprovidedatthebranch
circuitdistributionpanelandsizedasshownontheunit
ratinglabelandaccordingtoapplicablelocalcodes.See
theunitratingplate andTable1 (page 11) formaximum
circuitampacity&maximumovercurrentprotectionlimits.
• The installer should become familiar with the wiring
diagram/schematic before making any electrical
connections to the unit. See the unit wiring label or
Figure 12.
• 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.
• Ifreplacinganyoftheoriginalwiressuppliedwiththe
unit,thereplacementwiremustbecopperwireconsisting
of the same gauge and temperature rating.
• Providepowersupplyfortheunitinaccordancewiththe
unit wiring diagram, and the unit rating plate. Use UL
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.
• 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.
Grounding
WARNING:
Theunitcabinetmusthaveanuninterruptedor
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.
Thermostat Connections
• Thermostatconnections shall be in accordance with
the instructions supplied with the thermostat and the
iQ Drive system field wiring instructions. See Figure 7
(page 11)
• 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.
• Installthegrommet,whichispackedwiththeunit,inthe
holeforlow-voltagewires.NOTE:Whenthelowvoltage
wires are positioned in this grommet, the grommet will
preventchafingand/orshortingofthelowvoltageleads.
Control Board
The control board in the air handler controls the timing
sequenceoftheelements.SeeFigures10&11(page16).
NOTE: Variable speed air handlers cannot be twinned.
Heater Kits
When electric heat packages with circuit breakers are
field-installed, the circuit breaker may be used as a
disconnecting means in most applications. Reference
the NEC and local codes for disconnect requirements.
If a heater kit is installed:
The B4 air handler is shipped from the factory without an
electric heater kit installed. If electric heat is desired, the
H6HK heater kit may be purchased separately and field
installed. Determine the correct size heater kit for your
unit by referring to the list below or the units rating label.
B Cabinet.......................................................20Kw max
C Cabinet.......................................................30Kw max
1.Connect the2 wire plug of theair handler to the mating
2 wire plug of the heater kit.
2.Connect the line voltage leads to the circuit breaker or
terminal block provided.
3.Connect the heater kit plug with the mating receptacle
on the air handler control board.
If a heater kit is not installed:
1.Remove the 2 wire plug of the air handler by cutting
the wires and discarding the plug.
2.Strip the ends of the 2 air handler wires and connect
to the line-voltage leads with the 2 wire nuts provided.
Electronic Air Cleaner (EAC)
The unit has an output to power an electronic air cleaner
when the blower is running. This output is rated to 1.0
amp at 208/240V.

11
Figure 7. B4VM-EThermostat Connection
R
A+
B-
C
iQ
T-STAT
RCY
CR
W2 WH
OUTDOOR UNIT
BLOWER
R
DX+
DX-
GND
COIL
THERMISTOR
Table 1. Minimum Circuit Ampacity & Maximum Overcurrent Protection
Voltage Aux. Heat Installed
(Nom. KW)
Single Circuit Multiple Circuit
MCA MOP MCA MOP MCA MOP MCA MOP
Circuit
ACircuit BCircuit C
240
NONE 5.8 15 5.8 15 — — — —
005H 30.8 40 30.8 40 — — — —
008H 44.8 50 44.8 50 — — — —
010H 55.8 60 55.8 60 — — — —
015H 80.8 90 55.8 60 25.0 30 — —
020H 105.8 125 55.8 60 50.0 60 — —
025H 130.8 150 55.8 60 50.0 60 25.0 30
030H 155.8 175 55.8 60 50.0 60 50.0 60
208
NONE 5.8 15 5.8 15 — — — —
005H 27.4 30 27.4 30 — — — —
008H 39.4 40 39.4 40 — — — —
010H 49.0 50 49.0 50 — — — —
015H 70.7 80 49.0 50 21.6 25 — —
020H 92.3 100 49.0 50 43.3 50 — —
025H 113.9 125 49.0 50 43.3 50 21.6 25
030H 135.6 150 49.0 50 43.3 50 43.3 50

12
6.Weigh in the proper amount of new (or reclaimed)
refrigerant.
Refrigerant Charging
The system refrigerant charge can be checked and
adjusted through the service ports provided at the front
paneloftheoutdoorunit.Useonlygaugelineswhichhave
aSchraderdepressiondevicepresenttoactuatethevalve.
Air Circulation
Running the Blower Continuously
Set the thermostat’s system mode to OFF and the
thermostat’s fan mode to any speed level. The blower
motor should run continuously. Check for air delivery at
the register(s). Ensure 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.
Turning the Blower Off
Set thermostat’s fan mode to AUTO, the blower will shut
down immediately.
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 modetoHEATandthefan
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.
Blower Settings
The iQ Drive thermostat controls the blower speed and
timingtosatisfysettemperatures.SeeiQDrivethermostat
user manual.
Dehumidification
The iQ Drive system may provide some dehumidification
byloweringtheairflowtoincreasetheamountofhumidity
thatisremovedfromthecirculatingairduringcooling.See
iQ Drive thermostat user manual.
STARTUP & ADJUSTMENTS
WARNING:
Theevaporatorcoilis shipped fromthefactory
with a nitrogen charge. Use caution when
preparing coils for field connections.If repairs
makeitnecessaryforevacuationandcharging,
it should only be attempted by qualified,
trained personnel thoroughly familiar with this
equipment.Some local codes require licensed
installation service personnel to service this
type of equipment. Under no circumstances
should the equipment owner attempt to install
and/orservicethisequipment.Failuretocomply
with this warning could result in equipment
damage, personal injury, or death.
NITROGEN
HEALTH
FLAMMABILITY
REACTIVITY
0 Minimal Hazard 1 Slight Hazard
1
0
0
BeforeYou Start the Unit
Prior to start-up, complete the following inspections:
√Verifytheunitislevelandproperlylocatedwithadequate
clearances for servicing the unit. See Figure 1 (pg. 4).
√Check condensate drain line(s) for proper drainage.
√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.
√Verify that the line voltage power leads are securely
connectedandtheunitisproperlygrounded.Makesure
alldoors are installed beforerestoring powertotheunit
√Verify the thermostat is wired correctly. Make sure all
lowvoltagewiresare securelyconnectedto the correct
leads of the low voltage terminal strip.
√Verify the power supply branch circuit overcurrent
protection is sized properly.
√Verify filter is properly and securely installed.
IMPORTANT: Before starting the unit, install the initial
charge on units that are factory shipped with a nitrogen
holding charge:
1.Read all installation instructions first.
2.Purge the nitrogen holding charge.
3.Evacuate the unit to 250 - 500 microns.
4.Allow the unit to remain under vacuum for at least 30
minutes.
5.Inspect the unit rating plate for the proper type of
refrigerant and quantity.

13
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?
CABINET SIZE FILTER SIZE
B 18 x 20 x 1
C 20 x 20 x 1
Table 2. Filter Sizes
UNIT MAINTENANCE
Propermaintenanceismostimportanttoachievethebest
performancefromaair handler.Someofthecomponents
and their locations are shown in Figure 9 (page 15). 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
not being affected by drafts or heat from lamps or other
appliances.
• Toachievethebestperformanceandminimizeequipment
failure, it is recommended that a yearly maintenance
checkupbeperformed.Ataminimum,thischeckshould
include the following items:
AirFilter(s):B4VM-ESeriesAirHandlersarenotsupplied
with a single air filter when shipped from the factory. It
is recommended that the filter be cleaned or replaced
monthly. Newly built or recently renovated homes may
requiremorefrequentchanginguntiltheconstructiondust
has minimized.Filter sizes shown inTable 2 are available
at most local retailers.
WARNING:
Never operate the air handler without a filter in
place. Dust and lint in the return air can build
up on internal components,resulting in loss of
efficiency,equipmentdamage,andpossiblefire.
Filtersdesignedtoremovesmallerparticlessuchaspollen,
may require additional maintenance.
Blower Compartment: Dirt and lint can create excessive
loadsonthemotorresultinginhigherthannormaloperating
temperaturesandshortenedservicelife.Itisrecommended
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 and clean if necessary. Inspect
mounting nut for tightness when done.
Blower Motor & Assembly: Inspect the blower assembly
andmotor mounting brackets fortightness andcorrosion.
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.

14
FIGURES &TABLES
Table 3. B4VM-E Series Physical Dimensions
Cabinet Size H W A Detail D
B 43-5/16 19-11/16 18-1/4 No
Tall B 49-5/16 19-11/16 18-1/4 No
C 55-15/16 22-7/16 21 Yes
3/4”
3/4” 3/4”
13”
1 1/4”
1 5/8”
1 7/8” 1 1/4”
3 1/4”
2 5/8” ø11/8” K.O. (Typ.)
ø1 3/4” 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” Ø7/8" K.O.
H
22”
“A”
ø1 1/8” K.O. (Typ.)
ø17/8” K.O.

15
Horizontal
Drain PanVertical
Drain Pan
Coil
Assembly
Motor
Mount Kit
Blower
Motor
Transformer
Capacitor
Circuit
Breaker (60A)
Heating Element
Assembly
Filter
Tracks
Blower
Wheel
Blower
Housing
Control
Board
Filter
Door
Upper Door
Assembly
Lower Door
Assembly
Interface
Board
EXV
Board
Figure 9. Air Handler Components

16
Figure 11. B4VM-E EXV Control Board
R
R-410A 1 2 3 4 5678ON
OFF
R-22
THERM THERM/PRESS
C
Y
COMM EXV
CRG Y/Y2 O W1 W2 Y1
24VAC
COM
FUSE
P2
P3
X13 COM
X13 HEAT
X13 COOL
XFMR
L1/VSPOWER
L1
L2COM
L2
L2
Figure 10. X13 Motor Control Board

17
ECAFRETNI
BOARD
RCW2 WHY
R
P3
3 2 1
O.D. UNIT
I.D. BLOWER
THERMOSTAT
TWIN
DX+
DX-
GND GND
CR
DX-
DX+
TO
OUTDOOR
UNIT
HARNESS
THERMISTOR
THRU CORE
RING
TEMP
SENSOR
COIL
THRU CORE RING
HARNESS
HARNESS
HARNESS
VXE DRAOB
ON
R
Y
SW2
P2
THERM
P3
THERMSW1
COMM
P4
EXV
P1 C
OFF
SUCTION TEMP.
SENSOR
SUCTION PRESS.
SENSOR
GREEN
WHITE
YELLOW
I.D.
MOTOR
POWER
CABLE
TRANSFORMER
CONTROL
CABLE
7654321
PLUG CONNECTOR
PLUG
CONNECTOR
POWER FILTER
TO CONTROLLER THERMOSTAT
Y1
P3
L2
L2
L2 COM
24VAC
COM L1
L1
XFMR
W2
W1
O
Y/Y2 HEATER PLUG
KIT
G
R
C
RED
YELLOW
WHITE
GREEN
BLACK
RED
GREEN
BLACK
WHITE
RED RED
RED
GRAY
YELLOW
WHITE
BLACK
TO OUTDOOR
UNIT
(BLACKWIRES)
EXV
6-WIRE CABLE
CABLE
CABLE
WHITE
BLUE
GRAY
RED
CUTWIRES TO REMOVE PLUG HOUSINGWHEN HEATER
KIT IS NOT INSTALLED.
GREEN
BLACK
BLACK
RED
GRAY
BLACK
WHITE
GREEN
WHITE
RED
710872A
(Replaces 7108720)
FIELD WIRING
LEGEND:
LOW VOLTAGE
HIGH VOLTAGE
WIRING DIAGRAM
Air Handler for IQ Drive System NOTES:
1. Not suitable for systems exceeding 120V to ground. 2. If any internal wiring must be replaced, it must be replaced with 105°C wire of the same gauge.
¢710872-¤
Figure 12.Wiring Diagram for B4VM-E Series Air Handler with iQ Drive

18

19

708710C (Replaces 708710B)
INSTALLATION / PERFORMANCE CHECK LIST
INSTALLER NAME:
CITY: STATE:
INSTALLATION ADDRESS:
CITY: STATE:
UNIT MODEL #
UNIT SERIAL #
Minimum clearances perpage4? YES NO
Is the unit properly installed and
leveled? YES NO
Does condensate drain properly
inbothdraintubes? YES NO
Has the owner’s information been
reviewedwiththehome-owner? YES NO
Has the literature package been
leftneartheappliance? YES NO
ATTENTION INSTALLERS:
Itisyourresponsibilitytoknowthisproductbetterthanyourcustomer.
This includes being able to install the product according to strict
safety guidelines and instructing the customer on how to operate
and maintain the equipment for the life of the product.Safety should
always be the deciding factor when installing this product and using
common sense plays an important role as well. Pay attention to all
safetywarningsandanyotherspecialnoteshighlightedinthemanual.
Improper installation of the air handler or failure to follow safety
warnings could result in serious injury, death, or property damage.
Theseinstructionsareprimarilyintendedtoassistqualifiedindividuals
experienced in the proper installation of this appliance.Some local
codes require licensed installation/service personnel for this type of
equipment.Please read all instructions carefully before starting the
installation.Return these instructions to the customer’s package for
future reference.
ELECTRICAL SYSTEM:
Electricalconnectionstight? YES NO
Linevoltagepolaritycorrect? YES NO
Supply Voltage: ___________________________________(V)
Hasthethermostatbeencalibrated? YES NO
Isthethermostatlevel? YES NO
Istheheatanticipatorsettingcorrect? YES NO
VENTING SYSTEM:
Is there adequate fresh air supply for
ventilation? YES NO
Ventfreefromrestrictions? YES NO
Filterproperlyinstalled? YES NO
Filterclean? YES NO
Flueconnectionstight? YES NO
Isthereproperdraft? YES NO
ReturnAirTemp:___________________________________(°F)
SupplyAirTemp:___________________________________(°F)
TemperatureRise:__________________________________(°F)
PROPOSITION 65 WARNING: This product
contains chemicals known to the state of
California to cause cancer, birth defects or
other reproductive harm.
WARNING:
Specifications & illustrations subject to change without notice or incurring obligations.
O’Fallon, MO | Printed in U.S.A. (08/11)