Nordyne B6EM Series Manuel utilisateur

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. Some local codes require licensed installation/service personnel for this type

ofequipment.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

B6BM, B6EM, & B6VM Series

INSTALLATION INSTRUCTIONS

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

Oriﬁce removal & Installation .................................8

Connecting the Linsets ..........................................9

Condensate Drainage ............................................10

Electrical Connections.............................................11

Pre-Electrical Checklist ...........................................11

Line Voltage.............................................................11

Grounding................................................................11

Thermostat Connections.........................................11

Control Board..........................................................12

Twinning...............................................................12

Heater Kits...............................................................13

Electronic Air Cleaner..............................................13

Humidiﬁer................................................................13

Optional Humidistat.................................................13

Startup & Adjustments ............................................13

BeforeYou Start the Unit.........................................13

Refrigerant Charging...............................................14

Air Circulation..........................................................14

Running the Blower Continuously........................14

Selecting Continuous Low Spd Fan Operation ....14

Turning the Blower Off..........................................14

System Cooling....................................................14

System Heating....................................................14

Selecting minimum Electric Heat Airﬂow..............14

Blower Conﬁgurations.............................................14

Determining Nominal System Capacity ...............14

3-Speed Units......................................................14

High Efﬁciency Units (Var. & Fixed Speed)..........15

Selecting Basic Heating Airﬂow...........................15

Selecting Basic Cooling / Heat Pump Airﬂow.......15

Dehumidiﬁcation Options ........................................15

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:

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.

Unit Maintenance......................................................16

Troubleshooting........................................................16

Figures &Tables .......................................................17

Figure 11. B6BM Physical Dimensions................17

Figure 12. Air Handler Components.....................18

Airﬂow Data.............................................................19

Table 5.B6BM Air Handlers.................................19

Table 6.B6EM Air Handlers.................................20

Table 7.B6EM Air Handlers (Heat Only Airﬂow)..21

Table 8.B6VM Air Handlers (Cool Only Airﬂow)..21

Table 9.B6VM Airﬂow Settings............................22

Electrical Diagrams & Data .....................................23

Figure 13. Single Stage Control Board ................23

Figure 14.Two-Stage Control Board....................23

Figure 15.Two-Stage Fix. Sp. Control Board........24

Figure 16.Two-Stage Var. Sp. Control Board .......24

Figure 17. B6BM Wiring Diagram.........................25

Figure 18. B6EM Wiring Diagram.........................26

Figure 19. B6VM Wiring Diagram.........................27

Table 10.B6BM MCA & MOP Data......................28

Table 11.B6(E,V)M & B6BV MCA & MOP Data ..29

Table 12.Control Board Operation.......................30

Installation / Performance Checklist.......................32

WARNING:

B6 series air handlers leave the factory with

a nitrogen holding 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

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.

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

General Installation

• US:CurrenteditionoftheNFGCandtheNFPA90B.For

copies, contact the National Fire Protection Association

Inc., Batterymarch Park, Quincy, MA 02269;or American

Gas Association, 400 N. Capitol, N.W., Washington DC

20001 or www.NFPA.org

• CANADA:NSCNGPIC.Foracopy,contactStandardSales,

CSA International, 178 Rexdale Boulevard, Etobicoke

(Toronto), Ontario, M9W 1R3 Canada

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)

• 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.

SeeTables 5 - 9 (pages 19 - 22) and the rating plate 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.

• 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.

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.

√it is recommended that the cooling load of the area to

be conditioned should be calculated and a system of

the proper capacity selected.

√Checktheelectricalsupplyand verifythe powersupply

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

dimensionsforthisairhandler arealsoshowninFigure

11 (page 17).

• Theairhandlershouldbesetintopositionbeforerouting

the refrigerant tubing.

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. Applicable building codes may

require additional clearance to equipment. Refer to

applicable building codes for details.

• 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.

Table 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.

REAR

RIGHT

SIDE

LEFT

SIDE

FRONT

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 including electrical 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 pages 11 - 12.

• Theinstallationmustincludeaproperlyinstalledlterin

thereturn air system with no by-passair.Theﬁlter must

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

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.

TheB6Seriesairhandlermaybeinstalledinaresidential

garage with the provision that the unit must be located or

protected to prevent physical damage by vehicles.

as the opening provided on the air handler.The 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 may 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

B6 Series Air Handlers are not supplied with an air ﬁlter

whenshippedfromthefactory.Theinstaller must provide

ahighvelocityﬁlterthatisappropriatelysizedtothereturn

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 16) 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.Acousticalinsulation

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

Plenums & Air Ducts

• 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.

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 circulatingairducts mustnotbe

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).

• Thisunitisdesignedonlyforusewithareturnandsupply

duct.The return air duct must have the same free area

AIR HANDLER INSTALLATION

The B6 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.

• 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.

• Always reinstall the doors on the air handler after

servicingorcleaning/changingtheﬁlters.Donotoperate

theairhandlerwithoutalldoorsandcoversinplace.

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. Do not pull on the

coils upper tubes.

Mounting Applications

Vertical only air handlers are factory ready for upﬂow

applications. These units may be applied in downﬂow

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 may 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 1.

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 2.

Figure 1. Upﬂow Installation

Horizontal

Drain Pan

Return

Air

Figure 2. Downﬂow Installation

Tube

Close-off

Plate

Coil

Cabinet

Adaptor Kit

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

maymeanincreasingthe duct sizeand/orreducingthe

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.

Figure 4. Unit Horizontally Suspended

Threaded

Rod

Lag

Bolt

Nuts (x2)

Washer

and

Lockwasher

Nuts (x2)

Horizontal Installations

The B6 Series air handler can be installed horizontally in

an attic, basement, crawl space or alcove. It can also be

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 3.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 may

be 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 4) 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.Thestraps should be attachedtotheairhandlerwith

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.Insertthe plug(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:

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.

NOTE: It is recommended that the suction line be

insulated up to the coil inside of the cabinet.

7.Insertthe plug(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 3. Horizontal Conﬁgurations

HORIZONTAL RIGHT

HORIZONTAL LEFT

RETURN

AIR

RETURN

AIR

Oriﬁce Removal & Installation

The oriﬁce installed in the air handler has been sized for

use with the most popularly matched outdoor units.The

oriﬁce size as shipped from the factory is listed on the air

handler rating plate. Perform steps 1 - 9 to conﬁrm that

the oriﬁce size meets the requirements outlined in the

outdoor unit installation manual.

1.Remove the cap from the end of the liquid line.

2.Verifypressurization bydepressing the Schrader valve

ontheendoftheliquidline.Listenforanyescapinggas.

If there is no pressure, test the coil for leakage.

• Ifleakageisfound,clearlymarkthelocationoftheleak

and return the coil to the distributor for processing.

• Ifnoleaksarefound,thecoilmaybeinstalled.

3.Depress the valve to relieve all pressure from the coil.

4.Remove and discard the valve core.

CAUTION:

To prevent damage to the unit or internal

components, it is recommended that two

wrenchesbeusedwhenlooseningortightening

nuts. Do not over tighten!

5.Usingtwowrenches,loosenthenutanddistributorbody

as shown in Figure 5.Turn the assembly nut counter-

clock-wise until the oriﬁce body halves are seperated.

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

• 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 Figure 11 (page

17) 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.

• B6 Series air handlers are charged through service

valves on the end of the liquid tube for each circuit.

These must be removed before brazing the line sets.

Figure 5. Loosening of Nut & Distributor Body

6.Insert a light-gauge wire hook between the distributor

body and the restrictor oriﬁce while being careful not

to scratch either part. Carefully remove the restrictor

oriﬁce from the distributor body.See Figure 6 (page 9).

7.Check the actual size of the new oriﬁce. NOTE: The

size is stamped on its side. Do not use pin gauges to

measure the oriﬁce diameter.

8.Insert the new oriﬁce into the distributor body, rounded

end down.See Figure 7 (page 9).

Connecting the Linesets

IMPORTANT NOTES FOR HORIZONTAL OR

DOWNFLOW INSTALLATIONS WITHTXVVALVE:

• The sensing bulb must be located ﬂush against the

suction line for optimum heat transfer.

• Avoidattachingthesensingbulbtothelowestpartof

thesuctionlinewherecondensatemayaccumulate.

• Do not locate the sensing bulb on vertical sections

of the lineset.

• For horizontal lines,the bulb should not be located

at 12 or 6 o’clock position of the suction line.The

best location is at 4 or 8 o’clock.

• For additional information on proper sensing bulb

locations, please refer to the valve manufacturer’s

instructions.

IMPORTANT:ThestepsintheOriﬁceRemoval&Installation

section (page 8) must be performed before the linesets

are connected.

1.Remove grommets from line set holes.

CAUTION:

It is recommended that a wet rag be wrapped

around the suction line in front of the close

off plate or the sensing bulb (if TXV is

installed) 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:

It is recommended that a wet rag be wrapped

around the suction line in front of the close

off plate or the sensing bulb (if TXV is

installed) 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.

Figure 7. Restrictor Insertion into Distributor Body

Figure 6. Removal of Oriﬁce

CAUTION:

To prevent damage to the unit or internal

components, it is recommended that two

wrenchesbeusedwhenlooseningortightening

nuts. Do not over tighten!

9.Realign the assembly nut on the distributor body and

hand tighten both components. Mark a line on both

bodiesandthentightenanadditional1/4turnusingtwo

wrenches.Themovementofthetwolineswillshowhow

much the nut is tightened. If a torque wrench is used,

tighten to 10-12 ft. lbs. or 14-16 Nm.

• 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 may 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

preventthecondensatefromoverﬂowingthedrainpan.

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.

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 350 - 500

microns.

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.

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 8.

• Thedrainpanmustbedrainedwitheldsuppliedtubing

or pvc pipe and adequately trapped. Both drain tubes

must have 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.

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 8. Condensate Drainage Example

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