Nordyne B5SM -090 Series User manual

LIGHT COMMERCIAL AIR HANDLER

Installation Instructions

B5SM -090/120 SERIES

Horizontal Application - RearView Horizontal Application - FrontView

Vertical Application

Please read this information thoroughly and become familiar with the capabilities and

use of your appliance before attempting to operate or maintain this unit. Keep this

literature where you have easy access to it in the future.If a problem occurs,check the

instructions and follow recommendations given. If these suggestions don’t eliminate

your problem, call your servicing contractor.

Theseinstructionsareprimarilyintendedtoassistqualiﬁedindividualsexperiencedin

theproperinstallationofthisappliance.Somelocalcodesrequirelicensedinstallation/

service personnel for this type of equipment. Please read all instructions carefully

before starting the installation.

DO NOT DESTROY. PLEASE READ CAREFULLY AND

KEEP IN A SAFE PLACE FOR FUTURE REFERENCE.

IMPORTANT

Important Safety Information ....................................3

General Information ...................................................4

BeforeYou Install this Unit.........................................4

Locating the Air Handler............................................4

Field Connections for Electrical Power Supply..........4

Air Ducts....................................................................4

Unconditioned Spaces...........................................4

Acoustical Duct Work.............................................4

Air Handler Installation..............................................5

Packaging Removal...................................................5

Minimum Clearance Requirements...........................5

Horizontal Mounting Applications..............................5

Vertical Mounting Applications..................................5

Condensate Drain ....................................................5

Connecting Refrigerant Tubing..................................5

Filter Requirements ..................................................6

ElectricalWiring..........................................................7

Pre - Electrical Checklist ...........................................7

Line Voltage...............................................................7

Thermostat Connections...........................................7

Electrical Wiring with a Duct Heater..........................7

Unbalanced 3-Phase Supply Voltage........................8

Grounding..................................................................8

Startup & Adjustments ..............................................8

Pre - Start Checklist..................................................8

Motor Sheave Adjustment.........................................8

Pulley Alignment........................................................9

Belt Tensioning..........................................................9

Blower Adjustments...................................................9

Unit Maintenance........................................................9

Figures &Tables.......................................................10

Figure 4. Physical Dimensions - Horizontal..........10

Figure 5. Physical Dimensions - Vertical..............11

Table 4.Blower Performance Data.......................12

Electrical Information...............................................13

Figure 6. B5SM Wiring Diagram...........................13

Figure 7. Air conditioner T-stat Connections.........14

Figure 8. Heat pump T-stat Connections..............15

Figure 9. Maintenance Schedule .........................16

IMPORTANT SAFETY INFORMATION

Safety markings are used frequently throughout this

manualtodesignateadegreeorlevelofseriousness and

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:

Improper installation, service, adjustment,

or maintenance may cause explosion, ﬁre,

electricalshockor otherhazardousconditions

whichmayresult in personalinjury orproperty

damage. Unless otherwise noted in these

instructions, only factory authorized kits or

accessories may be used with this product.

WARNING:

Unless otherwise noted in these instructions,

onlyfactoryauthorizedkitsoraccessoriesmay

be used with or when modifying this product.

WARNING:

The safety information listed below must

be followed during the installation, service,

and operation of this unit. Unqualified

individualsshouldnotattempttointerpretthese

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

theseinstructions.Consultlocalbuildingcodesandthe

NationalElectricalCode(ANSICI)forspecialinstallation

requirements.

• Thisequipmentcontainsliquidandgaseousrefrigerant

underhighpressure.Installationorservicingshouldonly

beperformedbyqualiﬁedtrainedpersonnelthoroughly

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.

• Installationofequipmentmayrequirebrazingoperations.

Installer must comply with safety codes and wear

appropriate safety equipment (safety glasses, work

gloves,ﬁreextinguisher,etc.)whenperforming brazing

operations.

• Installthisunitonlyinalocationandpositionasspeciﬁed

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.

See Table 4 (page 12) and the rating plate for proper

circulating airﬂow data

• Consideration should also be given to the accessibility

offuel,electricpower,serviceaccess,noise,andshade.

Physical dimensions for each type of installation is

shown on pages 10 & 11. See Figure 4 for horizontal

installations or Figure 5 for Vertical installations.

• 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.

WARNING:

Evaporator coils are shipped from the factory

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

GENERAL INFORMATION

B5SM air handlers are shipped from the factory ready for

installation in a horizontal position.The units can be easily re-

conﬁgured in the ﬁeld for vertical applications. The return air

opening is interchangeable between the bottom of the unit and

the top panel simply by switching the ﬁlter-rack with the return

air cover panel. For either conﬁguration, sufﬁcient clearance

must be provided on the sides of the unit to allow access for

servicing the blower, motor, coil assembly, and ﬁlters.

Thisunithasbeendesignedandtestedforcapacityandefﬁciency

inaccordancewithA.R.I.Standards.This unit will providemany

years of safe and dependable comfort, providing it is properly

installed and maintained. With regular maintenance, this unit

will operate reliably year after year. Abuse, improper use, and/

or improper maintenance can shorten the life of the appliance

and create unsafe hazards.

BeforeYou Install the Air Handler

Thisequipmentissecurelypackedatthetimeofshipmentand

upon arrival should be carefully inspected for damage prior

to installing the equipment at the job site.Claims for damage

(apparent or concealed) should be ﬁled immediately with the

carrier.

The cooling load of the area to be conditioned must be

calculated and a system of the proper capacity selected.

Check the electrical supply and verify the power supply is

adequate for unit operation.The system must be wired and

providedwithcircuitprotectioninaccordancewithlocalbuilding

codes.If there is any question concerning the power supply,

contact the local power company.

Theairhandlershouldbeinstalledbeforeroutingtherefrigerant

tubing. Refer to the indoor unit’s installation instructions for

installation details.

Verify the air delivery of the/air handler is adequate to handle

the static pressure drop of the coil, ﬁlter, and duct work.

Please consult your dealer for maintenance information

and availability of maintenance contracts. Please read all

instructions before installing the unit.

Locating the Air Handler

• Surveythejobsitetodeterminethebestlocationformounting

the unit.

• Overhead obstructions, poorly ventilated areas, and areas

subject to accumulation of debris should be avoided.

• Considerationshouldbegiventoavailabilityofelectricpower,

service access, noise, and shade.

Field Connections for Electrical Power Supply

• All wiring must comply with current provisions of the National

Electrical Code (ANSI/NFPA 70) and with applicable local

codes having jurisdiction.

• Theminimumsizeofelectricalconductorsandcircuitprotection

must be in compliance with information listed on the outdoor

unit data label.

• Electrical power supplied to the unit must be adequate for

properoperationoftheequipment.Thesystemmustbewired

and provided with circuit protection in accordance with local

building codes.

Air Ducts

This unit is designed only for use with a supply

and return duct. Air ducts should be installed in

accordance with the standards of the National Fire

Protection Association Standard for Installation of

AirConditioningSystems(NFPA90A),Standardfor

Installation of Residence Type Warm Air Heating

and Air Conditioning Systems (NFPA 90B), and

all applicable local codes. NFPA publications are

avaialable by writing to: National Fire Protection

Association,BatterymarchPark,Quincy,ME02269

or visit www.NFPA.org on the web.

• Design the duct work according to methods

described by the Air Conditioning Contractors

of America (ACCA).

• Thereturnairductmusthavethesamefreearea

as the opening provided on the blower coil unit.

• Duct work should be attached directly to the unit

ﬂanges for horizontal and vertical applications.

See Figures 4 or 5 (pages 10 or 11).

Unconditioned Spaces

Allductworkpassingthroughunconditionedspace

must be properly insulated to minimize duct losses

and prevent condensation. Use insulation with an

outervaporbarrier.Refertolocalcodesforinsulation

material requirements.

Acoustical Duct Work

Certain installations may require the use of

acoustical lining inside the supply duct work.

• Acousticalinsulationmustbeinaccordancewith

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.

AIR HANDLER INSTALLATION

Packaging Removal

Remove the shipping crate and User’s Manual from the

equipment.Takecarenottodamagethetubingconnections

when removing the crate.

Minimum Clearance Requirements

This air handler must be installed with ample clearance

for easy access to the air ﬁlters, blower assembly, and,

controls. Allow 24 inches minimum clearance from the

front of the motor and refrigerant access panels for

service and maintenance.However 36 inches is strongly

recommended.

Horizontal Mounting Applications

B5SM air handlers can be suspended from support rods

at each corner and are supplied with the required 1/2-13

NC hardware. The installer only needs to supply the ½”

full threaded support rods in an appropriate length for

their application. NOTE: These units can be supported

with3/8”fullthreadedsupportrods,however allmounting

hardware must be ﬁeld supplied. Once in position, verify

the unit is level.See Figure 4 (page 10).

CAUTION:

When raising the air-handler for horizontal

mounting, always use safe lifting methods

and equipment. Always support the unit along

its entire width. Failure to do so may result in

damagetothelowerpanelsorotherequipment.

If determined safe for your application the

shipping pallet may be utilized with a forklift

for this operation.

Vertical Mounting Applications

Verifytheunitislevelandthereisadequateclearancesto

service the unit and provide the minimum 2”trap needed

for the condensate drain. See Figure 5 (page 11).

Condensate Drain

B5SM air handlers have condensate drain ports on both

sidesoftheunit,andmaybeconﬁguredfordrainagefrom

the left, right or both sides (Figures 4 or 5).Connection to

the drains can be made with a ¾”threaded PVC adapter.

Units are conﬁgured at the factory with the service side

drain open and a threaded PVC drain plug installed on

the opposite side. Each drain line installed requires its

own drain trap.To ensure proper drainage, the installed

drain trap(s) must provide a minimum trap of 2 inches.

Note: It is recommended that a secondary drain pan be

used when the unit is hung above an enclosed ceiling.

Connecting RefrigerantTubing

WARNING:

Evaporator Coils are factory shipped with a

nitrogen charge.Avoid direct face exposure or

contactwithvalvewhengasisescaping.Always

ensure adequate ventilation is present during

thedepressurizationprocess.Anyuncertainties

should be addressed before proceeding.

• 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.

• Refrigerant tubing should be supported in a manner

that the tubing will not vibrate or abrade during system

operation.

• Tubing should be kept clean of foreign debris during

installation.

• Every effort should be made by the installer to ensure

thattheﬁeldinstalledrefrigerantcontainingcomponents

of the system have been installed in accordance with

these instructions and sound installation practices to

insure reliable system operation and longevity.

• Alwaysrefertotheinstallationinstructionssuppliedwith

the outdoor unit for piping requirements. The suction

and liquid lines must be sized in accordance with the

condensing unit speciﬁcations.

• Ifpreciseformingofrefrigerantlinesisrequired,acopper

tubingbenderisrecommended.Avoidsharpbendsand

contact of the refrigerant lines with metal surfaces.

• A ﬁlter dryer is provided with the unit and must be

installedintheliquidlineofthesystem.Iftheinstallation

replaces a system with a ﬁlter dryer already present

in the liquid line, the ﬁlter dryer must be replaced with

the one supplied with the unit.The ﬁlter dryer must be

installed in strict accordance with the manufacturer’s

installation instructions.

• B5SMairhandlersaresuppliedwithadirectexpansion

refrigerant coil and thermostatic expansion valves.

Refrigerant line connections are located on the motor

side (service side) of cabinet and require sweat

connections.

NITROGEN

HEALTH

FLAMMABILITY

REACTIVITY

0 Minimal Hazard 1 Slight Hazard

• The B5SM-120 air handler has a dual circuit coil and

the B5SM-090 has a single circuit coil.

• The B5SM-120 air handler is charged through service

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

These must be removed before brazing the line sets.

The B5SM-090 is charged through a service valve

inside the unit, which should not be removed.

• BeforebrazingtheB5SM-090,removethecorefrom

the service port. Failure to do this may result in a leak

at the service valve. Replace the core and cap once

brazing is complete.

• Optionalequipmentsuchasliquidlinesolenoidvalves,

lowambient,etc.,shouldbeinstalledinstrictaccordance

with the manufacturer’s installation instructions.

Filter Requirements

B5SM air handlers are shipped with three permanent

1” ﬁlters; however the ﬁlter rack can be converted to

accommodate a 2” ﬁlter.To convert to a 2” ﬁlter:

1.Remove all ﬁlters from the unit.

2.Locate and remove the 4 screws (Figure 1) holding

the bottom ﬁlter slide assembly (latch end) to the ﬁlter

rack frame.NOTE: Be careful when removing the slide

assemblysoitdoesnotdropintounitandcausedamage

to the coil.

3.Remove the 4 screws securing the “L” bracket to the

“Z” bracket.

4.Rotate the“L”bracket 180 degrees, and reposition it so

it mounts ﬂush with the “Z” bracket. See Figure 1.

5.Secure the ﬁlter slide assembly together with the four

screws.

Table 2. Electrical Rating Data

MODEL VOLTAGE PHASE Hz FLA HP MCA MOP

-090 & -120 J 208-230/460 3 60 6.6-6.6/3.3 2 8.3-8.3/4.2 15

-090 & -120 K 208-230 1 60 11.3-10.0 2 14.2-12.5 25-20

FLA = Full Load Amps, MCA = Minimum Circuit Ampacity, MOP = Maximum Over-Current Protection

Table 1. Pressure Drop Across Filters

Model

B5SM Nominal

CFM

Filter

Size Resistance

(W.C.)

090

2200

18 x 24 (1”)

0.03

2600 0.04

3000 0.05

3400 0.07

3800 0.08

4200 0.09

120

3000

18 x 24 (1”)

0.05

3400 0.07

3800 0.08

4200 0.09

4600 0.11

5000 0.13

6.Re-installtheﬁlterslideassemblybackintotheﬁlterrack

frame and secure with the 4 screws removed earlier. If

replacingfactory suppliedﬁlterswith disposable ﬁlters,

use only 2” disposable ﬁlters.

Accessing the ﬁlters does not require tools and can be

performedfromeithersideoftheﬁlter-rack.Ontheservice

side of the unit, locate the release knob at the base of

the ﬁlter rack and rotate clockwise to unlock, then pull up

and out to remove the ﬁlter access panel.On the blower

side, use the same method but rotate counter-clockwise

to unlock.

Figure 1. Converting from 1”Filter to 2”Filter Applications

BRACKET CONFIGURATION FOR

2” FILTER APPLICATIONS

BRACKET CONFIGURATION

FOR 1” FILTER APPLICATIONS

(FACTORY SETTING)

“Z” BRACKET

“L” BRACKET

REMOVE 4 SCREWS FROM

FILTER RACK FRAME

FILTERS

FILTER BRACKET

LOCATION

REMOVE 4 SCREWS SECURING

“Z” BRACKET AND “L” BRACKET

ELECTRICALWIRING

WARNING:

To avoid risk of electrical shock, personal

injury,ordeath,disconnectallelectricalpower

to the unit before performing any maintenance

or service. The unit may have more than one

electrical supply.

Label all wires prior to disconnection when

servicing the unit. Wiring errors can cause

improper and dangerous operation.

• 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).

Pre-Electrical Checklist:

Verify that the voltage, frequency, and phase of the

supplysourcematchthespeciﬁcationsontheunitrating

plate.The label is located near the refrigerant lines.

Verifythattheserviceprovidedbytheutilityissufﬁcient

tohandletheadditionalloadimposedbythisequipment.

Phasebalanceon3phaseunitsmustalwaysbechecked.

See Unbalanced 3-Phase Supply Voltage (page 8).

LineVoltage

• It is recommended that the line voltage to the unit be

suppliedfroma dedicated branchcircuitcontainingthe

correct fuse or circuit breaker for the unit.

• Anelectricaldisconnectmustbelocatedwithinsight

ofandreadilyaccessibletotheunit.Thisswitchshall

becapableofelectricallyde-energizingtheoutdoorunit.

Seeunitdatalabelforproperincomingﬁeldwiring.Any

other wiring methods must be acceptable to authority

having jurisdiction.

• Refer to the unit wiring label for proper high and low

voltage wiring.

• Use only copper wire for the line voltage power supply

to this unit (Table 2, page 6).Use proper code agency

listed conduit and a conduit connector for connecting

the supply wires to the unit.

• Overcurrent protection must be provided at the branch

circuitdistributionpanelandsizedasshownontheunit

rating label and according to applicable local codes.

See the unit rating plate for maximum circuit ampacity

and maximum overcurrent protection limits.

• 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. The

installershouldbecomefamiliarwiththewiringdiagram/

schematicbeforemakinganyelectricalconnectionsto

the unit. See Figure 6 (page 13).

• These air handlers can be purchased in both single

andthreephase powerconﬁgurations,all single phase

equipment is shipped from the factory ready for ﬁeld

connections. For electrical connection locations see

Figures 4 or 5 (pages 10 or 11).

• Three phase units are shipped from the factory pre-

conﬁgured for high voltage operation.The 460 volt, 60

hertzunitsmaybereconﬁguredintheﬁeldfortheother

voltagesindicatedontheunitratinglabel.Foradditional

MaximumCurrentAmpacity(MCA),orMaximumOver-

current Protection (MOP) information, refer to the unit

ratinglabel.Forproperhighvoltagewiringorotherwiring

requirements refer to the Wiring Diagram (Figure 6).

• Internallymountedcircuitbreakersareavailableasﬁeld

installed options. These circuit breakers can be used

as an electrical disconnect.

Thermostat Connections

• Thermostatconnectionsshallbeinaccordancewiththe

instructionssuppliedwiththethermostatandtheindoor

equipment. The low voltage wires must be properly

connected to the units low voltage terminal block.

• A single stage thermostat is used with this equipment

and must operate in conjunction with any installed

accessories. A typical AC and air handler hookup is

shown in Figure 7 (page 14). For heat pump and air

handler connections, see Figure 8 (page 15).

• 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.

ElectricalWiring with a Duct Heater

Slip-in duct heaters are available as an accessory with

the B5SM air handler. See Table 3 for available sizes.

These heaters mount in the supply duct external to the

air handler. The heater kits are available in 10, 16, 26,

and 36 KW sizes and 240 or 460 voltages.All heater kits

are set up for three phase operation.To wire the heater

kits to the B5SM air handler unit, refer to the Installation

Instructions supplied witht he kit.

SKU Kw Volts/Phase/Hz MODEL

559428 10 208-240/3/60 H7HK010Q-01

559429 10 480/3/60 H7HK010S-01

559430 16 208-240/3/60 H7HK016Q-01

559431 16 480/3/60 H7HK016S-01

559432 26 208-240/3/60 H7HK026Q-01

559433 26 480/3/60 H7HK026S-01

559434 36 208-240/3/60 H7HK036Q-01

559435 36 480/3/60 H7HK036S-01

Table 3. Duct Mount Heater Kit Models

STARTUP AND ADJUSTMENTS

Pre-Start Check List

Prior to start-up, complete the following inspection:

Verifytheunitislevelandcondensatecandrain.Check

condensate drain line(s) for proper slope and trap.

Verify the air handler is mounted securely.

Verify the surrounding area and top of the unit is free

from obstructions and debris.

Check all ductwork connections. Make sure the duct

work is adequetly sealed to prevent air leakage.

Check all coil connections for leaks.

Verify that the line voltage power leads are securely

connected and the unit is properly grounded.

Verifythatthelowvoltagewiresaresecurelyconnected

to the correct leads on the low voltage terminal strip.

Make sure the thermostat is wired correctly.

Verifytheblowerrotatesproperly.Checktheblowerbelt

between the pulleys for proper tension and alignment.

Verify the power supply branch circuit overcurrent

protection is sized properly.

Verify all ﬁlters are in place and all equipment access/

control panels are in place

Motor Sheave Adjustment

The motor sheave consists of an outer, moveable pulley

face and an inner stationary face. To adjust the motor

sheave,

1.Relieve the belt pressure by loosening motor mount

bolts and the belt tensioning bolts on the motor mount.

2.Move the blower fan belt out of the way (if necessary)

and loosen the set screw in the outer sheave face.

3.Rotate the face in increments of one half or full turns

only. NOTE: This maintains the set screw position

precisely over the ﬂats on the pulley hub. Rotating the

sheave clockwise (when viewed from the lead end of

motor - opposit end of shaft) will make the blower run

slower which decreases airﬂow. Rotating the sheave

counterclockwise(asviewedfromleadend)willcause

the blower to speed up.

4.Tightenthesetscrewsafterthedesiredadjustmenthas

been made and verify the moveable face is properly

secured.

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.

Example:

AB = 451V

BC = 460V

AC = 453V

2.Determine the average voltage in the power supply.

3.Determine the maximum deviation:

4.Determine percent of

voltage imbalance by

using the results from

steps2&3inthefollowing

equation.

max voltage deviation

from average voltage

=100x average voltage

% Voltage Imbalance

454

100 x= 1.32%

Example:

1.Measure the line

voltages of your 3-phase

power supply where it

enters the building and

at a location that will

only be dedicated to the

unit installation. (at the

units circuit protection or

disconnect).

Unbalanced 3-Phase SupplyVoltage

Voltageunbalanceoccurswhenthevoltagesofallphases

of a 3-phase power supply are no longer equal. This

unbalance reduces motor efﬁciency and performance.

Someunderlyingcausesofvoltageunbalancemayinclude:

Lackofsymmetryintransmissionlines,largesingle-phase

loads, and unbalanced or overloaded transformers. A

motorshouldneverbeoperatedwhenaphaseimbalance

in supply is greater than 2%.

Perform the following steps to determine the percentage

of voltage imbalance:

In this example, the measured line voltages were

451,460,and453.Theaveragewouldbe454volts

(451 + 460 + 453 = 1,364 / 3 = 454).

The amount of phase imbalance (1.32%) is satisfactory

since the amount is lower than the maximum allowable

2%. Please contact your local electric utility company if

your voltage imbalance is more than 2%.

Example:

From thevalues givenin step 1,theBCvoltage

(460V) is the greatest difference in value from

the average:460 - 454 = 6

454 - 451 = 3

454 - 453 = 1

Highest Value

Figure 3. Proper BeltTension

1/4 inch

1 foot

Pulley Alignment

Inspect the pulley alignment between the motor sheave

and blower pulley. If a misalignment occurs, adjust the

location of the motor sheave by loosening the set-screw

in the stationary face of the motor sheave. Relocate the

sheaveassemblyonthemotorshafttoensurethebeltwill

be straight and aligned (Figure 2).Tighten the set-screw

andthenreinstallthefanbelt.Tightenthetensioningbolts

as described below.

BeltTensioning

Proper belt tension can be determined by testing the

belt deﬂection at the midpoint of the pulleys. The belt

should deﬂect ¼” per foot of span between the centers

of the pulleys (Figure 3). After the proper tension has

been applied, tighten the motor mount bolts to secure

the assembly, and visually inspect the area to ensure all

tools have been removed. Inspect all wire harness and

routings in the vicinity and make sure there is adequate

clearance for the wire harness.

Blower Adjustments - 3 phase units only

Ifbloweristurningoppositeofarrowdirection,disconnect

all power to unit and allow all rotating equipment to stop,

theninterchange any two ﬁeld wiredleads at theterminal

block OR disconnect connections.

The blower speed has been preset at the factory. For

optimum system performance and comfort, it may be

necessary to change the factory set speed. Adjustment

of the blower speed is made through varying the pitch of

the motor pulley, this adjustment allows for a wide range

of installation applications.Refer to Table 4 (page 12) for

blower performance data.

WARNING:

Neverperformmaintenanceonenergizedorrotating

equipment.Alwaysdisconnectelectricalpowerand

allowallrotatingequipmenttostopbeforeservicing

the unit. Failure to do so may result in personal

injury, loss of limb, or death from electrical shock

or entanglement in moving parts.

UNIT MAINTENANCE

The maintenance information listed below should be

performedinaccordancewiththeMaintenanceSchedule

shown in Figure 9 (page 16).

Filters

To clean permanent ﬁlters, remove the ﬁlters and wash

gentlywith mild soapandwater.Rinsein clean, hotwater

and allow to drain & dry thoroughly before reinstalling.

Drain Pan

Thedrainpanandthedrainlinesshouldbecleanedtoallow

condensate to drain properly.Remove any accumulation

of residue or sludge from the drain pan. Inspect in and

around the drain pan for rust, holes, and leaks.

V-Belts

Inspectforcracks,tears,andexcessiveorabnormalwear.

V-beltstendtoelongateovertimewithnormalapplication

and use. Ensure the belt always maintains adequate

tension without over tightening. Belts which have been

over tightened will wear out rapidly and may cause motor

and blower bearings to receive undue strain and wear.

As a result the unit could experience excessive vibration

and noise problems.

Blower Bearings

Theblowerassemblyincorporatessealedbearings.Under

normaloperatingconditions,nomaintenanceisnecessary

for the life of the equipment.

Blower Fan Wheel

Inspect the blower wheel blades for accumulations of dirt

andcleanifnecessary.Inspectmountingnutfortightness

when done.

Blower Motor and Assembly

Inspect the blower assembly and motor mounting

bracketsfortightness and corrosion.Correct deﬁciencies

ifneccessary.Theblowermotorcontainssealedbearings

and under normal operating conditions, no maintenance

is necessary for the life of the equipment.

Figure 2. Proper Belt Alignment

13 5/8"

15 9/16"

17 11/16"

17 13/16"

4 3/16"

4 3/8"

5 11/16"

8 3/16"

Air Flow

Electrical Connections

2 7/32"

3/4" 1 1/4"

18 13/16"

Supply Duct

22 1/16"

19 3/8"

57"

Center to Center

Field Installed Hanging Rods

28 1/2"

of Unit

of Gravity

23"

Return

Duct

Opening

2 3/16"

27 3/8"

Cabinet

Height

53"

Return Duct Opening

57" Filter Rack Frame

60 1/4"

Cabinet Width

1 5/8" 1 5/8"

25 1/16"

Filter

Rack

16 1/4"

Electrical

Knock-outs

Condensate

Drain

Figure 4. B5SM Physical Dimensions for Horizontal Installations

47 5/8"

Center to Center

Field Installed Hanging Rods

23 13/16"

of Unit

of Gravity

15 11/16"

4 3/4"

6 3/4"

Air Flow

Electrical Connections

7 1/2Ton Unit Refrigerant Line Connections

(Top View Shown with Doors Removed)

10Ton Unit Refrigerant Line Connections

(Top View Shown with Doors Removed)

FIGURES &TABLES

RearView

FrontView

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