B5SM -090/120 SERIES
Installation Instructions
LIGHT COMMERCIAL AIR HANDLER
Vertical Application
Horizontal Application - Rear View Horizontal Application - Front View
IMPORTANT
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, chec k the
instructions and follow recommendations given. If these suggestions don’t eliminate
your problem, call your servicing contractor.
These instructions are primarily intended to assist qualifi ed individuals 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.
DO NOT DESTROY. PLEASE READ CAREFULLY AND
KEEP IN A SAFE PLACE FOR FUTURE REFERENCE.
Important Safety Information ....................................3
General Information ...................................................4
Before You 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
Electrical Wiring ..........................................................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
2
IMPORTANT SAFETY INFORMATION
Safety markings are used frequently throughout this
manual to designate a degree or lev el of seriousness and
should not be ignored. WARNING indicates a potentially
hazardous situation that if not avoided, could result in
personal injury or death. CAUTION indicates a potentially
hazardous situation that if not avoided, ma y result in minor
or moderate injury or property damage.
WARNING:
W ARNING:
The safety information listed below must
be followed 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.
NITROGEN
HEALTH
FLAMMABILITY
REACTIVITY
0 Minimal Hazard
Evaporator coils are shipped from the factory
with a nitrogen charge. Use caution when
preparing coils for fi eld connections. If repairs
make it necessary for evacuation and char ging,
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/or service this equipment. Failure to comply
with this warning could result in equipment
damage, personal injury, or death..
1
0
0
1 Slight Hazard
W ARNING:
Improper installation, service, adjustment,
or maintenance may cause explosion, fi re,
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.
W ARNING:
Unless otherwise noted in these instructions,
only factory authorized kits or accessories may
be used with or when modifying this product.
• 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 b uilding codes and the
National Electrical Code (ANSI CI) for special installation
requirements.
• This equipment contains liquid and gaseous refrigerant
under high pressure. Installation or servicing should only
be performed by qualifi ed 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, fi re extinguisher , etc.) when performing brazing
operations.
• Install this unit only in a location and position as specifi 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.
See Table 4 (page 12) and the rating plate for proper
circulating airfl ow data
• Consideration should also be given to the accessibility
of fuel, electric power, service access, noise, and shade.
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.
3
GENERAL INFORMATION
B5SM air handlers are shipped from the factory ready for
installation in a horizontal position. The units can be easily reconfi gured in the fi eld for vertical applications. The return air
opening is interchangeable between the bottom of the unit and
the top panel simply by switching the fi lter-rack with the return
air cover panel. For either confi guration, suffi cient clearance
must be provided on the sides of the unit to allow access for
servicing the blower, motor, coil assembly, and fi lters.
This unit has been designed and tested for capacity and effi ciency
in accordance with A.R.I. Standards . This unit will provide many
years of safe and dependable comfort, providing it is properly
installed and maintained. With regular maintenance, this unit
will operate reliably year after y ear. Abuse, improper use, and/
or improper maintenance can shorten the life of the appliance
and create unsafe hazards.
Before You Install the Air Handler
This equipment is securely pack ed at the time of shipment and
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 fi led 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
provided with circuit protection in accordance with local building
codes. If there is an y question concerning the power supply,
contact the local power company.
The air handler should be installed before routing the refrigerant
tubing. Refer to the indoor unit’s installation instructions for
installation details.
V erify the air delivery of the/air handler is adequate to handle
the static pressure drop of the coil, fi lter, 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
• Survey the job site to determine the best location for mounting
the unit.
• Overhead obstructions, poorly ventilated areas, and areas
subject to accumulation of debris should be avoided.
• Consideration should be given to av ailability of electric power,
service access, noise, and shade.
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
Air Conditioning Systems (NFP A 90A), Standard for
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, Batterymarch Park, Quincy , ME 02269
or visit www.NFPA.org on the web.
• Design the duct work according to methods
described by the Air Conditioning Contractors
of America (ACCA).
• The return air duct must have the same free area
as the opening provided on the blower coil unit.
• Duct work should be attached directly to the unit
fl anges for horizontal and vertical applications.
See Figures 4 or 5 (pages 10 or 11).
Unconditioned Spaces
All duct work passing through unconditioned space
must be properly insulated to minimize duct losses
and prevent condensation. Use insulation with an
outer vapor barrier. Refer to local codes for insulation
material requirements.
Acoustical Duct Work
Certain installations may require the use of
acoustical lining inside the supply 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.
• Duct lining must be UL classifi ed batts or blankets
with a fi re hazard classifi cation of FHC-25/50 or
less.
• Fiber duct work may be used in place of internal
duct liners if the fi ber duct work is in accordance
with the current revision of the SMACNA
construction standard on fi brous 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.
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.
• The minimum size of electrical conductors and circuit protection
must be in compliance with information listed on the outdoor
unit data label.
• Electrical power supplied to the unit must be adequate for
proper operation of the equipment. The system must be wired
and provided with circuit protection in accordance with local
building codes.
4
AIR HANDLER INSTALLATION
Packaging Removal
Remove the shipping crate and User’s Manual from the
equipment. Take care not to damage the tubing connections
when removing the crate.
Minimum Clearance Requirements
This air handler must be installed with ample clearance
for easy access to the air fi lters, blower assembly, and,
controls. Allow 24 inches minimum clearance from the
front of the motor and refrigerant access panels for
service and maintenance. How e v er 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 suppor ted
with 3/8” full threaded support rods, howe ver all mounting
hardware must be fi eld 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. Alwa ys support the unit along
its entire width. Failure to do so may result in
damage to the lower panels or other equipment.
If determined safe for your application the
shipping pallet may be utilized with a forklift
for this operation.
Vertical Mounting Applications
V erify the unit is level and there is adequate clearances to
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
sides of the unit, and may be confi gured for drainage from
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 confi gured 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 Refrigerant Tubing
WARNING:
NITROGEN
HEALTH
FLAMMABILITY
REACTIVITY
0 Minimal Hazard
Evaporator Coils are factory shipped with a
nitrogen charge. A void direct face e xposure or
contact with valve when gas is escaping. Always
ensure adequate ventilation is present during
the depressurization process. Any uncertainties
should be addressed before proceeding.
• When connecting refrigerant linesets together, it is
recommended that dry nitrogen be fl owing through the
joints during brazing. This will prevent internal oxidation
and scaling from occurring.
• Refrigerant tubing should be routed in a manner that
minimizes the length of tubing and the number of bends
in the tubing.
• Refrigerant tubing should be suppor ted 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
that the fi eld installed refrigerant containing components
of the system have been installed in accordance with
these instructions and sound installation practices to
insure reliable system operation and longevity.
• 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 specifi cations.
• If precise forming of refrigerant lines is required, a copper
tubing bender is recommended. A void sharp bends and
contact of the refrigerant lines with metal surfaces.
• A fi lter dryer is provided with the unit and must be
installed in the liquid line of the system. If the installation
replaces a system with a fi lter dryer already present
in the liquid line, the fi lter dryer must be replaced with
the one supplied with the unit. The fi lter dryer must be
installed in strict accordance with the manufacturer’s
installation instructions.
• B5SM air handlers are supplied with a direct expansion
refrigerant coil and thermostatic expansion valves.
Refrigerant line connections are located on the motor
side (service side) of cabinet and require sweat
connections.
1
0
0
1 Slight Hazard
5
• 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.
• Before brazing the B5SM-090, remove the core fr om
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.
• Optional equipment such as liquid line solenoid valves,
low ambient, etc., should be installed in strict accordance
with the manufacturer’s installation instructions.
Filter Requirements
B5SM air handlers are shipped with three permanent
1” fi lters; however the fi lter rack can be converted to
accommodate a 2” fi lter. To convert to a 2” fi lter:
1. Remove all fi lters from the unit.
2. Locate and remove the 4 screws (Figure 1) holding
the bottom fi lter slide assembly (latch end) to the fi lter
rack frame. NOTE: Be careful when removing the slide
assembly so it does not drop into unit and cause damage
to the coil.
3. Remove the 4 screws securing the “L” bracket to the
“Z” bracket.
4. Rotate the “L” brack et 180 degrees, and reposition it so
it mounts fl ush with the “Z” bracket. See Figure 1.
5. Secure the fi lter slide assembly together with the four
screws.
6. Re-install the fi lter slide assembly back into the fi lter rack
frame and secure with the 4 screws remov ed earlier. If
replacing factory supplied fi lters with disposable fi lters,
use only 2” disposable fi lters.
Accessing the fi lters does not require tools and can be
performed from either side of the fi lter-rack. On the service
side of the unit, locate the release knob at the base of
the fi lter rack and rotate clockwise to unlock, then pull up
and out to remove the fi lter access panel. On the blower
side, use the same method but rotate counter-clockwise
to unlock.
Size
Filter
Resistance
(W.C.)
0.03
0.05
Model
B5SM
090
120
Nominal
CFM
2200
2600 0.04
3000 0.05
3400 0.07
3800 0.08
4200 0.09
3000
3400 0.07
3800 0.08
4200 0.09
4600 0.11
5000 0.13
18 x 24 (1”)
18 x 24 (1”)
Table 1. Pressure Drop Across Filters
FILTER BRACKET
FILTERS
REMOVE 4 SCREWS FROM
FILTER RACK FRAME
LOCATION
BRACKET CONFIGURATION
FOR 1” FILTER APPLICATIONS
(FACTORY SETTING)
“Z” BRACKET
REMOVE 4 SCREWS SECURING
“Z” BRACKET AND “L” BRACKET
BRACKET CONFIGURATION FOR
2” FILTER APPLICATIONS
“L” BRACKET
Figure 1. Converting from 1” Filter to 2” Filter Applications
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 2. Electrical Rating Data
6
ELECTRICAL WIRING
W ARNING:
To avoid risk of electrical shock, personal
injury, or death, disconnect all electrical power
to the unit before performing any maintenance
or service. The unit may have more than one
electrical supply.
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
supply source match the specifi cations on the unit rating
plate. The label is located near the refrigerant lines.
Verify that the service provided by the utility is suffi cient
to handle the additional load imposed by this equipment.
Phase balance on 3 phase units must alwa ys be checked.
See Unbalanced 3-Phase Supply Voltage (page 8).
Line V oltage
• 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.
• An electrical disconnect must be located within sight
of and readily accessible to the unit. This switch shall
be capable of electrically de-energizing the outdoor unit.
See unit data label for proper incoming fi eld wiring. 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
circuit distribution panel and sized as shown on the unit
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, the replacement wire must be copper wire consisting
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
installer should become familiar with the wiring diagram/
schematic before making any electrical connections to
the unit. See Figure 6 (page 13).
• These air handlers can be purchased in both single
and three phase power confi gurations, all single phase
equipment is shipped from the factory ready for fi eld
connections. For electrical connection locations see
Figures 4 or 5 (pages 10 or 11).
• Three phase units are shipped from the factory preconfi gured for high voltage operation. The 460 volt, 60
hertz units may be reconfi gured in the fi eld for the other
voltages indicated on the unit rating label . For additional
Maximum Current Ampacity (MCA), or Maximum Overcurrent Protection (MOP) information, refer to the unit
rating label. For proper high voltage wiring or other wiring
requirements refer to the Wiring Diagram (Figure 6).
• Internally mounted circuit breakers are available as fi eld
installed options. These circuit breakers can be used
as an electrical disconnect.
Thermostat Connections
• Thermostat connections shall be in accordance with the
instructions supplied with the thermostat and the indoor
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 abov e
the fl oor on an inside wall. DO NOT install the thermostat
on an outside wall or any other location where its
operation may be adversely aff ected by radiant heat from
fi replaces, sunlight, or lighting fi xtures, and convectiv e
heat from warm air registers or electrical appliances.
Refer to the thermostat manufacturer’ s instruction sheet
for detailed mounting and installation information.
Electrical Wiring 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
7
Unbalanced 3-Phase Supply Voltage
V oltage unbalance occurs when the voltages of all phases
of a 3-phase power supply are no longer equal. This
unbalance reduces motor effi ciency and performance.
Some underlying causes of voltage unbalance may include:
Lack of symmetry in transmission lines, large single-phase
loads, and unbalanced or overloaded transformers. A
motor should never be operated when a phase imbalance
in supply is greater than 2%.
Perf orm the follo wing steps to determine the percentage
of voltage imbalance:
1. Measure the line
voltages of your 3-phase
Example
:
power supply where it
enters the building and
at a location that will
only be dedicated to the
AB = 451V
BC = 460V
AC = 453V
unit installation. (at the
units circuit protection or
disconnect).
2. Determine the average voltage in the power supply.
In this example, the measured line voltages were
451, 460, and 453. The aver age would be 454 volts
(451 + 460 + 453 = 1,364 / 3 = 454).
3. Determine the maximum deviation:
Example:
From the v alues given in step 1, the BC voltage
(460V) is the greatest difference in value from
the average:
460 - 454 = 6
Highest Value
454 - 451 = 3
454 - 453 = 1
Grounding
W ARNING:
The unit cabinet must have an uninterrupted or
unbroken electrical ground to minimize personal
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/NFP A 70) or the CSA
C22.1 Electrical Code. Use the g rounding lug provided in
the control box for grounding the unit.
STARTUP AND ADJUSTMENTS
Pre-Start Check List
Prior to start-up, complete the following inspection:
Verify the unit is lev el and condensate can drain. 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.
V erify that the low voltage wires are securely connected
to the correct leads on the low voltage terminal strip.
Make sure the thermostat is wired correctly.
Verify the blower rotates properly . Check the blower belt
between the pulleys for proper tension and alignment.
Verify the power supply branch circuit overcurrent
protection is sized properly.
Verify all fi lters are in place and all equipment access/
control panels are in place
4. Determine percent of
voltage imbalance by
using the results from
steps 2 & 3 in the following
equation.
% Voltage Imbalance
=100x
Example:
100
x
= 1.32%
6
454
max voltage deviation
from average voltage
average voltage
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%.
8
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 fl ats 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 airfl ow. Rotating the sheave
counter clockwise (as viewed from lead end) will cause
the blower to speed up.
4. Tighten the setscrews after the desired adjustment has
been made and verify the moveable face is properly
secured.
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
sheave assembly on the motor shaft to ensure the belt will
be straight and aligned (Figure 2). Tighten the set-screw
and then reinstall the fan belt. Tighten the tensioning bolts
as described below.
Belt Tensioning
Proper belt tension can be determined by testing the
belt defl ection at the midpoint of the pulleys. The belt
should defl ect 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
If blower is turning opposite of arrow direction, disconnect
all power to unit and allow all rotating equipment to stop ,
then interchange any two fi eld wired leads at the terminal
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 v arying the pitch of
the motor pulley, this adjustment allows for a wide range
of installation applications. Ref er to Table 4 (page 12) for
blower performance data.
W ARNING:
Never perform maintenance on energized or rotating
equipment. Alwa ys disconnect electrical power and
allow all rotating equipment to stop before servicing
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
performed in accordance with the Maintenance Schedule
shown in Figure 9 (page 16).
Filters
To clean permanent fi lters, remove the fi lters and wash
gently with mild soap and water. Rinse in clean, hot w ater
and allow to drain & dry thoroughly before reinstalling.
Drain Pan
The drain pan and the drain lines should be cleaned to allow
condensate to drain properly . Remov e any accum ulation
of residue or sludge from the drain pan. Inspect in and
around the drain pan for rust, holes, and leaks.
Figure 2. Proper Belt Alignment
1/4 inch
1 foot
V-Belts
Inspect for cracks , tears, and excessive or abnormal wear.
V -belts tend to elongate over time with normal application
and use. Ensure the belt always maintains adequate
tension without over tightening. Belts which have been
over tightened will wear out rapidly and ma y cause motor
and blower bearings to receive undue strain and wear.
As a result the unit could experience excessiv e vibration
and noise problems.
Blower Bearings
The blower assembly incorporates sealed bearings. Under
normal operating conditions, no maintenance is necessary
for the life of the equipment.
Blower Fan Wheel
Inspect the blower wheel blades f or accumulations of dirt
and clean if necessary . Inspect mounting nut f or tightness
when done.
Blower Motor and Assembly
Inspect the blower assembly and motor mounting
brackets f or tightness and corrosion. Correct defi ciencies
if neccessary . The blower motor contains sealed bearings
and under normal operating conditions, no maintenance
is necessary for the life of the equipment.
Figure 3. Proper Belt Tension
9
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"
Field Installed Hanging Rods
47 5/8"
Center to Center
FIGURES & TABLES
C
of Gravity
L
C
L
of Unit
23 13/16"
1"
Electrical Connections
Air Flow
15 11/16"
6 3/4"
4 3/4"
7 1/2 Ton Unit Refrigerant Line Connections
(Top View Shown with Doors Removed)
28 1/2"
C
3"
of Gravity
L
10 Ton Unit Refrigerant Line Connections
(Top View Shown with Doors Removed)
Field Installed Hanging Rods
57"
Center to Center
C
of Unit
L
10
Electrical
Knock-outs
Condensate
Drain
22 1/16"
1 5/8"
2 3/16"
25 1/16"
Filter
Rack
Figure 4. B5SM Physical Dimensions for Horizontal Installations
23"
Return
Duct
Opening
2 3/16"
18 13/16"
Supply Duct
60 1/4"
Cabinet Width
57" Filter Rack Frame
53"
Return Duct Opening
16 1/4"
19 3/8"
Front View
1 5/8"
27 3/8"
Cabinet
Height
Rear View
19 3/8"
18 13/16"
Supply Duct
22 1/16"
53 1/4"
Cabinet
Height
23"
Duct Opening
Return
16 1/4"
19 3/8"
T op View
Cabinet Width
60 1/4"
18 13/16"
Duct Opening
Supply
22 1/16"
Electrical
Knock-outs
Electrical
Connections
25 1/16"
Filter Rack
Frame
Cabinet Depth
27 3/8"
(without Filter Rack)
16 1/4" Supply
Duct Opening
9 1/8"
2
5 1/16"
Condensate
Drain
53"
Return Duct Opening
57"
Filter Rack Frame
Front View
Figure 5. B5SM Physical Dimensions for Vertical Installations
29 5/16"
Depth
(with Filter Rack)
Side View
11
AIRFLOW DATA
2826 794 1.01
2899 743 0.94
External Static Pressures (Inches Water Column)
0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
CFM RPM Kw CFM RPM Kw CFM RPM Kw CFM RPM Kw CFM RPM Kw CFM RPM Kw CFM RPM Kw CFM RPM Kw CFM RPM Kw
Sheave
Fully
Position
Motor
3961 667 1.20 3706 668 1.11 3436 669 1.03 3081 669 0.93 2738 672 0.83
4182 666 1.28
Closed
1 T urn
3867 629 1.09 3638 630 1.01 3366 631 0.95 3055 632 0.85 2672 633 0.77
Open
2052 597 0.59
3268 592 0.82 3074 593 0.80 2783 593 0.74 2490 594 0.68
2 T urns
2203 555 0.57
3283 554 0.79 2966 555 0.72 2619 555 0.65
Open *
3 T urns
Open
4 T urns
2611 486 0.57 2355 487 0.53
Open
External Static Pressures (Inches Water Column)
0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
CFM RPM Kw CFM RPM Kw CFM RPM Kw CFM RPM Kw CFM RPM Kw CFM RPM Kw CFM RPM Kw CFM RPM Kw CFM RPM Kw
Motor
Sheave
Position
4640 868 2.00 4442 870 1.95 4208 873 1.87 4025 876 1.77 3875 877 1.68 3497 879 1.59 3207 882 1.49
4789 868 2.12
Fully
1 T urn
Closed
4707 822 1.92 4547 824 1.85 4416 826 1.77 4223 827 1.68 3996 829 1.60 3816 693 1.51 3565 625 1.20 3330 837 1.28 3051 839 1.19
Open
4410 779 1.63 4258 780 1.56 4071 784 1.50 3867 786 1.45 3632 787 1.31 3396 790 1.23 3092 792 1.13
2 T urns
Open *
3 T urns
3896 708 1.17 3776 724 1.20 3587 731 1.16 3408 736 1.10 3151 740 1.02
Open
4 T urns
2873 522 0.53 2785 534 0.54
Open
12
Model
090
B5SM-
(2HP)
60 Hz
Model
Table 4. Blower Performance Data
120
B5SM-
(2HP)
60 Hz
* Denotes Factory Adjustable Sheave Setting
Bold Indicates Factory Recommended Blower Operating Range
Shaded Area -Not Recommended for Operation
Values based on dry coils and do not include fi lter losses
SINGLE PHASE
THREE PHASE
G
C
W2
W1
O/B
Y
R
G
C
W2
W1
O/B
Y
R
L2
L1
G
L3L2L1
G
L1 L2 G
FIELD SUPPLY CONNECTIONS
L1 L2 L3 G
FIELD SUPPLY CONNECTIONS
L1 L2
T1 T2
L1 L2
T1 T2
L3
T3
208-230/460V
460
208-230
460
208
-
230
Electrical Configurations
1. Three phase units are factory wired for
460V/60Hz or 380V/50Hz operation.
2. To reverse motor rotation, interchange
any two field wired line leads.
7109700
1009
FIELD WIRING
LEGEND:
LOW V OLTAGE
B5SM Series
7.5/10T Air Handler Systems
GENERAL NOTES:
THREE PHASE ONLY NOTES:
1. Disconnect all power before servicing.
2. If wiring must be replaced, use only
105˚C copper wire of the same gauge.
3. For economizer application, remove black wire
from low voltage board “Y” terminal and connect
to yellow wire from economizer.
3. Three phase, 60 Hz units may be
configured for 208-230V operation by
relocating the internal selector pin at
the rear of the motor as shown below.
(See product literature for more
information, if necessary.)
Frequency Single Phase Three Phase
60 Hz 208-230V 208-230/460V
50 Hz 220V 380V
GREEN
BLACK
BLACK
SEE
NOTE 3
BLACK
SEE
NOTE 3
GREEN
BLACK
BROWN
FREEZESTAT
BROWN
FREEZESTAT
Y
Tstat
Y
Tstat
ELECTRICAL INFORMATION
Figure 6. Wiring for Single and Three Phase Units
13
NOTE:
C &W2 to be connected to electric heat.
SINGLE STAGE
HEA T/COOL THERMOSTAT
RCG
YW
OPTIONAL
BROWN
TO FIELD
SUPPLIED DISCONNECT
GND
L1
L2
L3
BLOWER
MOTOR
FREEZESTAT
GREEN
C
Y
R
OUTDOOR
SECTION
C
Y
R
OUTDOOR
SECTION
SINGLE STAGE
HEAT/COOL
THERMOSTAT
RCG
YW
OPTIONAL
FREEZESTAT
GREEN
G
C
W2
W1
O
Y
R
TERMINAL
BOARD
G
C
W2
See Note
W1
O
Y
BLACK
R
TERMINAL
BOARD
SINGLE STAGE HEAT/COOL THERMOSTAT- NO ECONOMIZER
1. C & W2 to be connected to electric heat.
2. Remove BLACK wire from air handler low voltage terminal board
Y terminal and connect to YELLOW wire from economizer.
3. 2nd Stage refrigerant cooling with optional economizer installed. A 2
stage thermostat is required for simultaneous operation of the economizer
TO FIELD
SUPPLIED DISCONNECT
GND
BLACK
BLACK
Note 2
Note 1
Note 3
AIR HANDLER
SECTION
L1
L2
L3
BLOWER
MOTER
B
Y1
Y2
C7150
M.A.S.
Note 4
GRY
YEL
GRN
BLK
WHITE
ORN
BLUE
RED
RED
and refrigerant system. Connect Y2 from 2 stage thermostat to BLUE
wire from economizer. If installing an economizer in this unit, refer to the
Economizer installation instructions for proper set up and operation.
4. Heat Pump Economizer Relay. For heat pump applications only, connect B
from thermostat to GREY wire from Economizer. Required for proper operation
of an economizer (optional) in the heat pump Heating mode. If installing an
economizer in this unit, refer to the Economizer installation instructions for
proper set up and operation.
GRY-90”
AB
7
46
13
BLACK
AIR HANDLER
SECTION
GRN-18”
9
GRN-18”
C7400A
YEL-18”
OPTIONAL
ECONOMIZER
s
NOTES:
VIO-14”
BLU-14”
W7459A
TR
S
o
S
r
1
3
T
P
2
4
TR 1
JUMPER
5
2K
T1
P1
WIRE
1S
1S
TB-11 M7415A
BLK-12”
T
RED-12”
T1
GRY-12”
P1
BLK-12”
P
BLU-12”
TR
TR1
MA
MIN.
POT.
14
SINGLE STAGE HEAT/COOL THERMOSTAT- WITH ECONOMIZER
Figure 7. Typical Air conditioner Thermostat Connections
1. Jumper between W2 and E is required.
NOTES:
2. C &W2 to be connected to electric heat.
SINGLE STAGE
HEAT PUMP THERMOSTAT
W2
O
R
NOTE 1
C
W2
O
R
Y
OUTDOOR
SECTION
TO FIELD
SUPPLIED DISCONNECT
GND
L1
C
G
YE
B
L2
L3
BLOWER
MOTER
FREEZESTAT
BROWN
GREEN
G
C
BLACK
W2
O
R
BLACK
Y
NOTE 2
W1
TERMINAL
BOARD
AIR HANDLER
SECTION
NOTE 1
C
W2
O
R
Y
OUTDOOR
SECTION
SINGLE STAGE
HEAT PUMP THERMOSTAT
C
G
W2
O
YER
B
FREEZESTAT
BROWN
G
C
W2
O
R
Y
W1
TERMINAL
BOARD
TYPICAL HEAT PUMP THERMOSTAT CONNECTION (NO ECONOMIZER)
1. Jumper between W2 and E is required.
2. C & W2 to be connected to electric heat.
3. Remove BLACK wire from air handler low voltage terminal board
Y terminal and connect to YELLOW wire from economizer.
TO FIELD
SUPPLIED DISCONNECT
GND
BLACK
GREEN
BLACK
NOTE 2
NOTE 4
AIR HANDLER
SECTION
NOTE 3
Y2
C7150
M.A.S.
L2
L3
BLOWER
MOTER
NOTE 5
B
Y1
L1
GREY
YELLOW
GREEN
BLACK
WHITE
ORANGE
BLUE
RED
RED
4. 2nd Stage refrigerant cooling with optional economizer installed. A 2
stage thermostat is required for simultaneous operation of the economizer
and refrigerant system. Connect Y2 from 2 stage thermostat to BLUE
wire from economizer. If installing an economizer in this unit, refer to the
Economizer installation instructions for proper set up and operation.
5. Heat Pump Economizer Relay. Connect B from thermostat to GREY
wire from Economizer. Required for proper operation of an economizer
(optional) in the heat pump Heating mode. If installing an economizer in
this unit, refer to the Economizer installation instructions for proper set
up and operation.
GRY-90”
AB
7
46
13
9
C7400A
YEL-18”
OPTIONAL
ECONOMIZER
GRN-18”
GRN-18”
s
VIO-14”
BLU-14”
NOTES:
W7459A
TR
S
o
S
r
1
3
T
P
2
4
TR 1
JUMPER
5
2K
T1
P1
WIRE
1S
1S
TB-11 M7415A
BLK-12”
T
RED-12”
T1
GRY-12”
P1
BLK-12”
P
BLU-12”
TR
TR1
MA
MIN.
POT.
TYPICAL HEAT PUMP THERMOSTAT CONNECTION (WITH ECONOMIZER)
Figure 8. Typical Heat Pump Thermostat Connections
15
Installed by: Date Installed:
Maintenance Task
WMSAA
Air Filters
Inspect, clean or replace as required.
x
Condensate Drain(s) & Pan
Clean condensate drain pan
x
Inspect the flow of condensate through
the drain lines. Clean or Correct
problems as necessary.
x
Blower Assembly
Inspect the fan belt for wear, alignment
& and proper tension. Replace or adjust
as required.
x
Clean the blower wheel and housing.
x
Inspect the blower assembly for
corrosion and all hardware for security.
x
Inspect the blower coil unit casing for
corrosion and loose fasteners.
x
Coils
Inspect the coil fins for excessive dirt or
damage. Clean or repair if required.
x
Inspect all coil connections for leaks.
x
Air Handler Assm.
Inspect Mounting Hardware for security
and corrosion
x
Inspect Filter Rack mounting hardware
for security
x
Inspect panel assemblies for proper
installation and security
x
Performance
Date Performed:
Schedule
Figure 9. Maintenance Schedule
NOTE: The schedule above is for normal duty applications only. For severe duty applications, adjust schedule as appropriate. Additional tasks may be required
for severe duty applications.
The installer performing this work assumes all responsibility for this installation. Safety should always be the deciding factor when
installing this product and using common sense plays an important role as well. Improper installation of the components or failure
to follow safety warnings could result in serious injury, death, or property damage. After completing the installation, return these
instructions to the equipment owner’s package for future reference.
O’Fallon MO
¢7090950K¤
7090950
Specifi cations and illustrations subject to change
without notice or incurring obligations.
Printed in U.S.A. (01/10)
7090950
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