Luxaire K*BU060A Series User manual

GENERAL
These completely assembled 5, 7-1/2 and 10 ton blower
units include a well insulated cabinet, a DX cooling coil with
copper tubes and aluminum fins, an expansion valve, a
distributor, throwaway filters, a centrifugal blower, a blower
motor contactor and a small holding charge of refrigerant-22.
Blower motors and adjustable drives are factory-installed on
all units.
The units are shipped in the vertical position readyfor field
installation. For horizontal installation, reverse the solid
bottom panel and the return air duct flange on the front of
the unit.
INSPECTION
As soon as a unit is received, it should be inspected for
possible damage during transit. If damage isevident, the
extent of the damage should be noted on the carrier’s freight
bill. A separate request for inspection by carrier’s agent
should be made in writing.
RENEWAL PARTS
Refer to Parts Manual for complete listing of replacement
parts on this equipment for complete listing of replacement
parts. The forms referenced in this instruction may be
ordered from:
Publications Distribution Center
Unitary Products Group
P.O. Box 1592,York, PA. 17405
This instruction covers the installation and operation of
evaporator blower units. For information on the operation of
the matching condensing unit, refer to Forms 550.46-N1W,
550.46-N2W and 550.23-N1W.
Installer should pay particular attention to the words:
NOTE
,
CAUTION
and
WARNING.
Notes are intended to clarify or make the installa-
tion easier. Cautions are given to prevent equipment damage. Warnings are given to alert installer that personal injury and / or equipment
damage may result if installation procedure is nothandled properly.
MODELS K*BU060A, K*BC090A, & K*BC120A
035-16673
INSTALLATION
INSTRUCTION
AIR COOLED
SPLIT-SYSTEM AIR CONDITIONERS
Supersedes: 550.23-N2W (589) 550.23-N2Z (399)

TABLE OF CONTENT
General ................................................................................ 1
Renewal Parts...................................................................... 1
Inspection............................................................................. 1
INSTALLATION
Limitations............................................................................ 3
Location................................................................................ 3
Clearances........................................................................... 3
Rigging and Handling .......................................................... 4
Vertical / Horizontal Installation............................................ 4
Duct Connections................................................................. 4
Refrigerant Mains................................................................. 5
Drain Connection ................................................................. 6
Supply Air Blower Adjustment ............................................. 6
Power and Control Wiring.................................................. 11
MAINTENANCE
Filters ................................................................................. 12
Evaporator Coil .................................................................. 12
Drain Pan ........................................................................... 12
Lubrication ......................................................................... 12
Belts................................................................................... 12
TABLES
No. Description Page
1 Unit Application Data.................................. 3
2 Physical Data.............................................. 5
3 Blower Motor Pulley Adjustment ................ 7
4 Blower Performance................................... 8
5 Accessory Static Resistance...................... 8
6 Blower Motor and Drive Data..................... 8
7 Electrical Data ............................................ 11
FIGURES
No. Description Page
1 Unit Suspension Mounting......................... 3
2 Vertical & Horizontal Application................ 4
3 Supply Air Duct Connection....................... 4
4 Electric Heater Accessory.......................... 5
5 Supply Air Plenum Accessor .................... 5
6 Base Accessory.......................................... 5
7 Return Air Grille Accessory........................ 5
8 Recommended Drain Piping ...................... 6
9 Motor Mounting Assembly.......................... 7
10 Hole Locations for Pressure Readings....... 7
11 Pressure Drop vs.Supply Air CFM ............ 7
12 Unit Dimensions & Clearances (5 tons)..... 9
13 Unit Dimensions & Clearances ................. 10
(7-1/2 & 10Tons)
14 Typical Field Wiring..................................... 11
K B BU090A3 3
PRODUCT CATEGORY
K-Split-System Evap.Blower
W ith M o to r a n d D riv e
PRODUCT GENERATION
B -2nd G eneration
C -3rd G eneration
D -4th G eneration
PRO DUC T IDENTIFIER
NOMINAL
COOLING CAPACITY
FACTO RY
INSTALLED HEAT
A -N otApplicable
VOLTAG E CO DE
060 -5 TO N
090 -7-1/2 TO N
120 -10 TO N
06 -208/230-1-60
33 -208/230/460-3-60
BU -Evap.Blow er(5 Ton)
B C - E v a p . B lo w e r (7 -1 /2 & 1 0 T o n
NOMENCLATUR
550.23-N2Z
2Unitary Products Group

LIMITATIONS
This unit must be installed in accordance with all national
and local safety codes. If no local codes apply,installation
must conform to the appropriate national code. The unit is
designed to meet National Safety Code Standards. If
components are to be added to a unit to meet local codes,
they are to be installed at the dealer’s and/or the customer’s
expense. See Table 1 for application limitations.
LOCATION
These Evaporator Blowers are not designed for outdoor
installation. They must be located within the building
structure, either inside or outside the conditioned space.
These Evaporator Blower sections allow for vertical or
horizontal installation in any areaoffering proper electrical
supply, duct and drain connections.
They may be installed either with ductwork or matching
plenum and inlet grille.
The units should be located as close to the condensing units
as practical and positioned to minimize bends in the
refrigerant piping.
Units being installed vertically or horizontally can be set
directly on a floor or platform, or metal or wooden beams
can support them.
Units being installed horizontally can be suspended from
above. Four 3/8" weld nuts are provided in the unit frame to
accommodate hanger rods. Knockouts must be removed
from the unit panels toexpose these weld nuts. Refer to
Figure 1for their location and the individual load on each
hanger rod.
WARNING:Be careful when attaching the hanger rods. They
must not be allowed to turn or slip.
CLEARANCES
Refer to the unit dimension details, Figures 12 and 13 for
clearances required for servicing andfor proper unit
operation.
INSTALLATION
Model Power
Supply
Voltage
Variation Supply Air CFM Entering AirTemperatures, °F
Cooling Coil - db/wb Heating Coil - db
Min. Max. Min. Max. Min. Max. Min. Max.
KBBU060A06 208/230-1-60 187 252 1600 2400 65/57 95/72 40 77
KBBC090A33 208/230-3-60
460-3-60 187 432 252 504 2400 3600 65/57 95/72 40 77
KBBC120A33 208/230-3-60
460-3-60 187 432 252 504 3200 4800 65/57 95/72 40 77
* Utilization Range "A" in accordance with ARI Standard 110
TABLE 1 - UNIT APPLICATION DAT
34-1/2 (KEU060)
49-1/4 (KEU090, 120)
W1
W4
37-9/16 (KEU060)
44-7/8 (KEU090, 120)
W2
W3
AIR
OUT
AIR
IN
CENTER
O F G R A V IT Y
1-1/4 (K EU 060)
1-3/8 (K EU 090,120)
2-5/8
RETURN AIR GRILLE, HOT WATER
COIL AND STEAM COIL
ACCESSORIES INSTALLED ON
ON THIS END OF THE UNIT.
SUPPLY AIR PLENUM AND
ELECTRIC HEATER ACCESSO RIES
IN S T A L L E D O N T H IS E N D O F T H E
UNIT.
A
B
(4)3/8"-16
W ELD NUUTS
Model Center of Gravity Dimensions (in.) Weight Distribution (Lbs.)
A B W1 W2 W3 W4 TOTAL
KBU060 22-3/8 15-1/4 60 65 40 45 210
KBC090 26-1/4 23-3/4 85 93 70 77 325
KBC120 26-5/8 24-1/8 85 95 70 80 330
FIG. 1 - UNIT SUSPENSION MOUNTING (Horizontal Application)
550.23-N2Z
Unitary Products Group 3

RIGGING AND HANDLING
Be careful when moving the unit. Do not remove any
packaging until the unit is near its final location.
The packaging consists of a bottom wooden skid that can be
lifted with afork truck from any direction, a corrugated
container that covers the entire unit, and strapping that
secures the container to the skid.
These units can be rigged with slings under the bottom skid
CAUTION: Spreaderbarsshouldbeusedtoprevent theslings
from crushing the unit panels and frame.
Before rigging any unit, determine its weight from Table 2.
Before rigging a unit for horizontal installation, determine its
center of gravity from Figure 1, and make sure that its weight
will be distributed equally.
VERTICAL/HORIZONTALINSTALLATION
These evaporator blowers are shipped for vertical installation
with vertical air discharge as shown in Figure 2(A) butmay
be converted for horizontal installation as shown in Figure
2(B) by interchanging the solid bottom panel and the retur
air duct flange.
DUCT CONNECTIONS
Design and install all ducts in accordance with all national
and/or local codes.
Refer to Figure 3 for suggested method of connecting supply
air ductwork.
Ducts should be sized no smaller than the duct flanges on
the unit or the electric heater (if used). Refer to the unit
dimension details (Figure 12 and 13) and the heater detail
(Figure 4) for theses sizes. Refer to Form 550.12-N10.1U for
installation instructions on the electric heater.
Use flexible fiber glass or plastic cloth collars or other
non-flammable material at the unit duct connections to
minimize the transmission of noise and vibration.
Insulate all ductwork running through unconditioned areas to
prevent moisture condensation and to provide more
economical operation.
The return air duct flange is factory-mounted on the front of
the unit, but it can be reversed with the solid bottom panel for
horizontal applications. When the return air grille is used,
the duct connection frame is not used.
NOTE: If return air duct is not used, applicable installation
codes may limit the unit to installation only in a single
story residence.
A supply air plenum (Figure 5), a base (Figure 6), and a
return air grille (Figure 7) are available as field-installed
accessories, and one of the following respective instruction
forms will be packed with each.
•550.13-N10.2U - Supply Air Plenum
•550.13-N10.3U - Return Air Grille
•550.12-N10.4U - Base
The supply air plenum and the return air grille should be
used in lieu of ductwork only when a free blow/free return
application is practical.
REFRIGERANT MAINS
Many service problems can be avoided by taking adequate
precautions to provide an internally clean and dry system
and by using procedures and materials that conform with
established standards.
AIR
OUT
AIR
OUT
BLOW ER BLOW ER M OTOR
LO C A TIO N
COIL
RETURN AIR
DUCT FLANGE
AIR
IN
SOLID
BOTTO M PANEL
BLOW ER
RETURN AIR
DUCT FLANGE
SOLID
BOTTO M PANEL
AIR
IN
COIL
BLOW ER M OTOR
LO C A TIO N
HORIZONTAL
POSITIO N
VERTICAL
POSITIO N
(A )
(B )
AIR
OUT
NON-FLAM M ABLE
C O LLA R
FLANGED DUCT
CONNECTION
(F IE L D
FABRICATED)
DUCT
SUPPLY AIR
DUCT FLANGE
BLOW ER GASKET
(BY INSTALLER)
FIG. 2 - VERTICAL AND HORIZONTAL APPLICATION FIG. 3 - SUPPLY AIR DUCT CONNECTION
550.23-N2Z
4Unitary Products Group

Hard drawn copper tubing should be used where no
appreciable amount of bending around pipes or other
obstructions is necessary. Use long radius ells wherever
possible with one exception. Use short radius ells fortraps
in allvertical suction risers. If soft copper must be used,
avoid sharp bends, which may cause a restriction.
Fiberglass insulation and a sealing material such as
permagum should be packed around refrigerant lines where
they penetrate a wall to reduce vibration and to retain some
flexibility.
Support all refrigerant lines at minimum intervals with
suitable hangers, brackets or clamps. Braze all
copper-to-copper joints with Sil-Fos 5 or equivalent brazing
material. Do not use soft solder.
Never braze or solder the liquid and suction lines together.
The complete suction line should be insulated with no less
than 1/2" ARMAFLEX or equivalent. If the liquid and suction
lines are to be taped together for support purposes, they
must be completely insulated from one another.
INSTALLING REFRIGERANT MAINS
The units are evacuated anddehydrated at the factory and
shipped with a holding charge of Refrigerant-22. The suction
and liquid connections are sealed with copper discs. Refer
to the appropriate condensing unit installation instructions for
charging data.
DESCRIPTION UNIT MODEL
060 090 120
EVAPORATOR COIL
Rows Deep x Rows Wide 3 x 24 3 x 27 3 x 32
Finned Length - inches 30 46 46
Face Area - square feet 5.0 8.6 10.2
Tube OD - inches 3/8 3/8 3/8
Fins per inch 13 13 13
CENTRIFUGAL BLOWER
(Forward Curve) Diameter x Width - inches 10 x 10 15 x 15 15 x 15
MOTORS1Nominal HP Rating 3/4 1-1/2 2
FILTERS
(Throwaway) Quantity Per Unit 16" x 25" x 1" 2 4 4
Face Area - square feet 5.6 11.1 11.1
DISTRIBUTOR OnePer Unit 4-3-6-125-3-10-125-3-12-12
OPERATING
Weight, Lbs.3
Basic Unit 210 325 330
Accessories
Supply Air Plenum 90 102 102
Return Air Grille 12 15 15
Hot Water Coil 56 82 82
Steam Coil 57 85 85
Base 45 60 60
Electric Heat: 10 K 60 63 63
16 K 64 66 66
26 K 68 71 71
36 K - 74 74
HOT WATER COIL
TubesOD, inches 1/2 (Copper)
Rows Deep 2
Fins Per Inch 12 (Aluminum)
Face Area, square feet 3.6 6.8 6.8
Connections (Supply & Return) 1" NPTE
STEAM COIL
Outer TubeOD, inches 1 (Brass)
Rows Deep 1
Fins Per Inch 8 (Aluminum)
Face Area - square feet 3.7 6.6 6.6
Connection Inlet 1-1/2" NPTE
Outlet 1-1/2" NPTE
ELECTRIC HEAT Heater
Elements
% Nickel 59.2
%Chromium 16.0
Watt Density,
watts/sq. in. 59.0
Face Area, square feet 3.0
SHIPPING VOLUME - CubicFeet (Basic Unit) 30 53 53
1Refer to Blower Motor and Drive Data for additional blower motor and drive information.
2The first digit refers to inlet diameter (1/8"), second digit refers to tube diameter (1/16") and the third digit refers to number of tubes and the
fourth digit refers to number of distributors.
3Refer to the unit installation instruction for the distributed weight of the evaporator blower unit:
Form 550.23-N1W (060, 090 and 120)
TABLE 2 - PHYSICAL DAT
550.23-N2Z
Unitary Products Group 5

CAUTION: Always puncture sealing caps and discs with a
small drill bitbefore unbrazing to preventthe pres-
sure in the line from blowing them off.
Before starting installation of the mains be sure the unit has
not developed a leak in transit by drilling a small hole in the
sealing discs. If pressure still exists, the circuit may be
considered leak free. If pressure does not exist the coil
should be leak tested.
NOTE: To minimize the possibility of system failure due to dirt
andmoisture,afilter-driermustbeinstalledintheliquid
lineas closetotheevaporatoraspossible. Filter-driers
arenotsuppliedwiththeevaporatorblowers. Theyare
supplied with the matching condensing sections.
If check valves are required, they must be purchased and
installed in the field. The temperature required to make or
break a brazed joint is sufficiently high to cause oxidation of
the copper unless an inert atmosphere is provided.
CAUTION: Dry nitrogen should flow through the system at all
times whenheat is being applied and untilthe joint
has cooled.
The liquid and suction connections must be piped outside
the unit. Refer to the unit drawing for locations and the
dimensions of these connections.
Before brazing the refrigerant lines to these connections,
remove the short panel from the unit frame and slide it
(along with the grommets) onto the refrigerant lines. After
the brazed joints have cooled, slide the panel back into place
and secure it to the unit frame.
NOTE: These unitscan only be piped from onesideofthe unit.
EXPANSION VALVE BULB
On KBU060 and KBC090 units, the expansion valve bulb must
be fastened in a 4 o’clock position to the suction line outside the
cabinet after the piping connections have been made.
On KBC120 units, fasten the expansion valve bulb on the
suction header 8" below the top of the header, and adjacent
to the coil.
Use the clamps provided with the valve to secure the bulb in
position.
DRAIN CONNECTION
The drain line must be trapped because the coil is located
on the negative side of the supply airblower. It must be
protected from freezing temperatures.
A 7/8" O.D.drain connection extends through right hand side
of cabinet. Refer to Figure 8 for recommended drain piping.
The drain connection is located on the same side of the unit
as the refrigerant connections. The line should be insulated
where moisture dripping will be objectionable or cause
damage to the area.
The 3" dimension must equal or exceed the negative static
pressure developed by the supply air blower. If it does not,
the condensate will not drain properly and may overflow the
drain pan. The trap must be at least 2-1/2" deep to maintain
a water seal under all operating conditions, especially during
blower start-up.
1"DUCT FLANGE
HEATER ELEM ENT
CHAMBER CONTROL BOX
ACCESS PANEL
SUPPLY
AIR
A
VERTICALARRANGEMENT
SHO W N
N otU L approved w ith installation ofa
Supply A irP lenum accessory orw ith
a KBU 060 unitinstalled horizontally.
B
BLO W ER
UNIT
MODEL 5 TON 7-1/2 & 10 TON
A 16-7/8 19-1/4
B 20-1/8 22-1/4
FIG. 4 - ELECTRIC HEATER ACCESSORY
ALTERNATE
AIR DISCHARGE
BLO W ER
UMIT
SUPPLY
AIR
TO P
PANEL
GRILLE
VERTICAL
ARRANGEMENT
SHOW N
Plenum should be field m ounted on the supply airend ofblow er
units foreitherverticalorhorizontalapplication. Forreardischarge,
rotate plenum 180 degrees. Forhorizontaldischarge on a horizontal
unit,the grille paneland the top panelw illbe arranged differently.
R eferto Form 550.13-N 10.2U forinstallation and assem bly instructions.
FIG. 5 - SUPPLY AIR PLENUM ACCESSORY
BLO W ER
UNIT
BLO W ER UNIT
BASE PANEL
FO R VER TIC AL
ARRANGEM ENT
ONLY
W HEN OUTDOOR AIR IS REQUIRED,A HOLE CAN BE
CUT IN BACK PANEL FOR CONNECTING DUCTW ORK.
VERTICAL
ARRANGEMENT
SHO W N
FIG. 6 - BASE ACCESSORY FIG. 7 - RETURN AIR GRILLE ACCESSORY
550.23-N2Z
6Unitary Products Group

NOTE: Refer to Figure 12 or 13 for minimum clearance re-
quirements.
SUPPLY AIR BLOWER ADJUSTMENT
The RPM of the supply air blower will depend on the
required CFM, the unit accessories and the static
resistances of both the supply and the return air duct
system. With this information, the RPM for the supply air
blower can be determined from the blower performance
shown inTable 4.
Knowing the required blower RPM and the blower motor HP,
the setting (turns open) for the supply air motor pulley can be
determined from Table 3.
Each motor pulley has:
1. A threaded barrel with two flats (or notched recesses) 180
degrees apart.
2. A movable flange with one set screw.
After the movable flange has been rotated to the proper
number of "turns open"; the set screw should be tightened
against the flat on the barrel to lock the movable flange in
place. If the pulley includes a locking collar, the locking
collar must be loosened to adjust the setting of the movable
flange.
Note the following:
1. The supply air CFM must be within the limitations shown in
Table 1.
2. All Pulleys can be adjusted in half turn increments.
3. The tension on the belt should be adjusted for a deflection
of3/16 of an inch per footof beltspan with anapplied force
of 2 to 3 pounds. Moving theblower motor mounting plate
makes this adjustment. Refer to Figure 9. Turning the
adjustment bolt (B) moves the motor mounting plate up or
down. Note- NEVERloosenthetwonuts(C). Twohex nuts
(A) have to be loosened to move the mounting plate and
retighten after the mounting plate has been moved to the
proper position.
4. All pulleys are factory aligned.
5. Allsupplyairmotorpulleys arefactory setat3"turns open".
STEEL
STUB
CONNECTION
PLASTIC
ELL
3"
2"
HOSE CLAMPS
EVAPORATOR
COIL
DRAIN
PAN
DRAIN
PLUG
FIG. 8 - RECOMMENDED DRAIN PIPING
TURNS
OPEN
DRIVE RANGE (RPM)
KBU060
810-1110 KBC090 655-880 KBC120 700-950
5 810 655 700
4 870 700 750
3 930 745 800
2 990 790 850
1 1050 835 900
0 1110 880 950
* Pulleys can be adjusted in half-turn increments.
TABLE 3 - SUPPLY AIR BLOWER MOTOR PULLEY
ADJUSTMENT
A
MOTOR
MOUNT
B
C (DO NOT LOOSEN)
MOTOR
FIG. 9 - TYPICAL MOTOR MOUNTING ASSEMBL
5/16"
HOLE
5/16"
HOLE
C
A
EVAPORATO R
COIL
FILTERS
B
D
AIR
IN
FIG. 10 - HOLE LOCATIONS (PRESSURE DROP
READINGS)
MODEL DIMENSIONS (in.)
ABCD
KBU060 9-1/2 2-1/4 19 10-1/4
KBC090 3 3 14 12
KBC120 3 3 14 12
NOTE: Shut down the refrigeration system before taking any
test measurements to assure a dry evaporator coil.
550.23-N2Z
Unitary Products Group 7

After the supply air blower motor is operating, adjust the
resistances in both the supply and the return duct systems
to balance the air distribution throughout the conditioned
space. The job specifications may require that this balancing
be done by someone other than the equipment installer.
To check the supply air CFM after the initial balancing has
been completed:
1. Drill two 5/16-inch holes in the side panel as shown in
Figure 10.
2. Insert at least 8"of 1/4 inch tubing intoeach ofthese holes
for sufficient penetration intothe airflowon both sides of the
evaporator coil.
NOTE: The tubes must be inserted and held in a position
perpendicular to the airflow so that velocity pressure
will not affect the static pressure readings.
3. Using an inclined manometer,determine the pressure drop
across a dry evaporator coil. Since the moisture on an
evaporator coil may vary greatly, measuring the pressure
drop across a wet coil under field conditions would be
0.3
0.2
0.1
0.0
70 80 90 100 110 120 130 140
PERCENT NOMINAL CFM
PRESSURE DRO P
(IW G )
KBU 090, KB C 120
KBC060
FIG. 11 - PRESSURE DROP ACROSS A DRYEVAPORATOR COILVS. SUPPLY
AIR CFM
RPM CFM
SP2BHP3KW SP2BHP3 KW SP2BHP3KW SP2BHP3KW SP2BHP3KW
060
1600 1800 2000 2200 2400
800 0.43 0.38 0.34 0.30 0.45 0.41 0.16 0.52 0.48 - - - - - -
810 0.45 0.39 0.35 0.32 0.46 0.42 0.18 0.53 0.49 0.02 0.61 0.56 - - -
900 0.64 0.48 0.43 0.53 0.56 0.51 0.40 0.64 0.59 0.25 0.73 0.68 0.10 0.82 0.77
1000 0.87 0.58 0.53 0.77 0.67 0.63 0.65 0.76 0.71 0.51 0.86 0.81 0.37 0.97 0.90
1100 1.12 0.69 0.64 1.03 0.78 0.73 0.92 0.89 0.83 0.79 1.00 0.94 0.66 1.13 1.04
1110 1.15 0.70 0.65 1.06 0.79 0.74 0.95 0.90 0.84 0.82 1.02 0.95 0.69 1.16 1.08
1200 1.39 0.80 0.75 1.30 0.90 0.84 1.20 1.02 0.95 1.09 1.15 1.07 0.97 1.30 -
090
2400 2700 3000 3300 3600
600 0.35 0.62 0.59 0.26 0.70 0.66 0.13 0.78 0.73 - - - - - -
655 0.49 0.70 0.66 0.41 0.78 0.72 0.30 0.87 0.82 0.07 0.96 0.90 - - -
700 0.60 0.77 0.73 0.53 0.85 0.80 0.43 0.95 0.89 0.29 1.06 0.99 0.12 1.17 1.09
800 0.92 0.97 0.90 0.85 1.06 0.99 0.77 1.18 1.10 0.65 1.30 1.21 0.49 1.42 1.32
880 1.18 1.11 1.04 1.11 1.24 1.16 1.03 1.37 1.28 0.91 1.50 1.38 0.77 1.64 1.53
900 1.24 1.15 1.07 1.18 1.28 1.19 1.10 1.42 1.32 0.98 1.55 1.43 0.84 1.70 1.57
1000 1.58 1.35 1.26 1.53 1.48 1.38 1.46 1.63 1.48 1.37 1.81 1.65 1.24 2.02 1.85
120
3200 3600 4000 4400 4800
700 0.49 1.01 0.94 0.34 1.17 1.09 0.14 1.33 1.24 - - - - - -
800 0.84 1.25 1.16 0.71 1.42 1.32 0.53 1.60 1.48 0.30 1.80 1.64 - - -
900 1.18 1.48 1.38 1.06 1.70 1.57 0.91 1.92 1.75 0.70 2.18 1.99 0.43 2.45 2.24
950 1.37 1.61 1.50 1.26 1.86 1.71 1.11 2.12 1.95 0.91 2.39 2.18 0.65 2.67 2.44
1000 1.56 1.75 1.62 1.46 2.02 1.85 1.32 2.30 2.10 1.13 2.60 2.38 0.87 2.90 2.65
NOTE: Referto Form 550.13-AD1 forblower performance curves.
RPM range for the standard, factory-mounted drive components.
Exceeds the BHP limitation of the standardfactory mounted blower motor.
1Unit resistance is based on a wet evaporator coiland clean filters.
2Available static pressure in IWG to overcome the resistance of the duct system and any accessories added to the unit. Refer to the respective tables for the resistance of these accessories and
f or additional motor and drive data.
3Motors can be selected to operate into their service factor because they are located in themoving air stream, upstream of any heating device. Units with steam or hot water coils are theonly
exception. On these units, the BHP must not exceed the nominal HP rating of the motor.
TABLE 4 - SUPPLY AIR BLOWER PERFORMANCE1
550.23-N2Z
8Unitary Products Group

inaccurate. Toassure a dry coil, the refrigeration system
should be de-activated while the test is being run.
4. Knowing the pressure drop across a dry coil, the actual
CFM through the unit can be determined from the curve in
Figure 11.
If the CFM is above or below the specified value, the supply
air motor pulley may have to be re-adjusted. After one hour
of operation, check the belt and pulleysfor tightness and
alignment.
WARNING:Failureto properlyadjustthe totalsystem air quan-
tity can result in extensive blower damage.
After readings have been obtained, remove the tubes and
seal up the drilled holes in the side panel 5/16" dot plugs
(P/N 029-13880) are available through normal parts ordering
procedures.
Unit Model Accessory CFM
1600 1800 2000 2200 2400
060
Electric Heaters 10 KW 0.01 0.01 0.01 0.02 0.02 16 KW 0.01 0.02 0.02 0.03 0.04
26 KW 0.02 0.03 0.04 0.05 0.08
Supply Air Plenum 0.03 0.04 0.05 0.07 0.10
Return Air Grille 0.03 0.04 0.05 0.07 0.10
Hot Water Coil 0.16 0.21 0.24 0.28 0.32
Steam Coil 0.13 0.16 0.19 0.22 0.26
2400 2700 3000 3300 3600
090
Electric Heaters
10 KW 0.01 0.01 0.01 0.02 0.02
16 KW 0.01 0.02 0.02 0.03 0.04
26 KW 0.03 0.04 0.05 0.06 0.07
36 KW 0.05 0.07 0.08 0.10 0.11
Supply Air Plenum 0.03 0.03 0.04 0.05 0.06
Return Air Grille 0.02 0.03 0.04 0.05 0.06
Hot Water Coil 0.11 0.14 0.17 0.20 0.23
Steam Coil 0.10 0.12 0.14 0.16 0.19
3200 3600 4000 4400 4800
120
Electric Heaters
10 KW 0.02 0.02 0.03 0.03 0.04
16 KW 0.03 0.04 0.05 0.06 0.07
26 KW 0.06 0.07 0.09 0.11 0.13
36 KW 0.09 0.11 0.14 0.17 0.20
Supply Air Plenum 0.05 0.06 0.07 0.08 0.10
Return Air Grille 0.05 0.06 0.07 0.08 0.10
Hot Water Coil 0.19 0.24 0.30 0.35 0.40
Steam Coil 0.16 0.19 0.23 0.27 0.31
MODELS MOTOR
HP BLOWER (RPM)
ADJUSTABLE
MOTOR PULLEY FIXED BLOWER PULLEY BELTS
PITCH
DIA.
(IN.) BORE
(IN.) PITCH
DIA.
(IN.) BORE
(IN.) DESIG- NATION PITCH
LENGTH
(IN.)
060 3/4 810 - 1110 2.8 - 3.8 5/8 6.0 3/4 A32 33.3
090 1-1/2 655 - 880 2.8 - 3.8 7/8 7.5 1 A36 37.3
120 2 700 - 950 2.8 - 3.8 7/8 7.0 1 A36 37.3
NOTES: 1. All motors are 1750 RPM and have a 56 frame, inherent protection and permanently lubricated ball bearings. The 3/4 HP motor is split phase and has a resilient base and a1.25
servicefactor. The 1-1/2 and 2 HPmotors have asolid base and a 1.15 service factor.
2.Three-phase motors are be wired for a 460 volt power supply. Referto the wiringdiagram inside the motor terminal box when motor leads have to be reconnected for a
208 or 230 volt power supply.
TABLE 5 - STATIC RESISTANCES FOR UNIT ACCESSORIES (IWG)
TABLE 6 - BLOWER MOTOR AND DRIVEDATA
550.23-N2Z
Unitary Products Group 9

1-23/32 KNOCKOUT
(Removed only when
Electric Heat Accessory
is used)
36-1/8
8-1/2 13-1/4
3-7/8
1
7/8" HOLE W/BUSHING
IN REAR PANEL
(For Low Voltage
Control Panel)
7/8" KNOCKOUT
IN REAR PANEL
(For Power Wiring)
4-1/2 3/4
11-1/2 22-3/4
2-5/16
11-5/8
AIR
OUT
BLOWER MOTOR
AND DRIVE
ACCESS PANEL
(This side inly)
FILTER ACCESS
PANEL(This
side only) 43-1/8
HOLE WITH GROM-
MET FOR 3/8 O.D.
LIQUID LINE
HOLE WITH GROM-
MET FOR 7/8 O.D.
SUCTION LINE
3-7/8
2
10-3/8 1-3/8 1-3/16
1-1/8
22
2
7/8 O.D. DRAIN
CONN. (Must be
trapped)
32
2
1-5/8
20
AIR
IN
2-1/4
ACCESSORIES
•ELECTRIC HEATER - Add 13" to unit height when used.
•SUPPLY AIR PLENUM - Add 24-1/4" to unit height when
used.
•BASE - Add 20" to unit height when used.
MINIMUM CLEARANCES
Side with RETURN AIR opening 24"
Side with SUPPLY AIR opening 24"1
Side with PIPING CONNECTIONS 36"2
Side opposite PIPING CONNECTIONS 12"
Side with access for both POWER & CONTROL
WIRING -3
Bottom - 4
1 Overall dimension of the unit will vary if an electric heater,a supply air plenum
or a base is used.
2 This dimension is required for removal of the coil. Only 26" is required for
normal service.
3 Although no clearance isrequired for service and operation, some clearance
may be required for routing the power and control wiring.
4 Allow enough clearance to trap the condensate drain line.
FIG. 12 - UNIT DIMENSIONS & CLEARANCES (KBU060)
All dimensions are in inches. They are subject to change
without notice. Certified dimensions will be provided upon
request.
550.23-N2Z
10 Unitary Products Group

All dimensions are in inches. They are subject to change
without notice. Certified dimensions will be provided upon
request.
1-23/32 KNOCKOUT
(Removed only when
Electric Heat Accessory
is used)
52-1/4
15-3/8 18-7/8
3-5/8
1
7/8" HOLE W/BUSHING
FOR CONTROL
WIRING
(Back Panel)
1-3/8" KNOCKOUT
FOR POWER WIRING (Back Panel)
Do not remove this knockout when
the unit is equipped with an Electric
Heat Accessory. Refer to detail of
the Heater Accessory for power
wiring access opening
4-1/4 5/8
16-1/8 25-7/8
15
AIR
OUT
BLOWER MOTOR
AND DRIVE
ACCESS PANEL
(This side only)
51-1/8
HOLE WITH GROM-
MET FOR 1/2 O.D.
LIQUID LINE
HOLE WITH GROM-
MET FOR 1-1/8 O.D.
SUCTION LINE
4
2-5/8 1-3/8
1-3/4
1-1/8
25-1/8
2
7/8 O.D. DRAIN
CONN. (Must be
trapped)
48
2
1-5/8
23
AIR
IN
2-1/4
1
6-3/4
3-1/4
FILTER ACCESS PANEL
(When unit is installed in
a horizontal position,do
not block this area with
refrigerant piping)
8-3/8
ACCESSORIES
•ELECTRIC HEATER - Add 14-1/4"to unit height when used.
•SUPPLY AIR PLENUM - Add 27-1/2" to unit height when
used.
•BASE - Add 20" to unit height when used.
MINIMUM CLEARANCES
Side with RETURN AIR opening 24"
Side with SUPPLY AIR opening 24"1
Side with PIPING CONNECTIONS 52"2
Side opposite PIPING CONNECTIONS 12"
Side with access for both POWER & CONTROL
WIRING -3
Bottom - 4
1 Overall dimension of the unit will vary if an electric heater,a supply air plenum
or a base is used.
2 This dimension is required for removal of the coil. Only 26" is required for
normal service.
3 Although no clearance isrequired for service and operation, some clearance
may be required for routing the power and control wiring.
4 Allow enough clearance to trap the condensate drain line.
FIG. 13 - UNIT DIMENSIONS & CLEARANCES (KBC090 & 120)
550.23-N2Z
Unitary Products Group 11

POWER AND CONTROL WIRING
Install electrical wiring in accordance with the latest National
Electrical Code (NFPA Standard No. 70 and/or local
regulations). The unit must be grounded in accordance with
these codes.
POWER WIRING
Remove the knockout from the units rear panel (7/8" for
KBU060, 1-3/8" for KBC090, and 120) for power wiring
conduit through this opening. Connect the conduit to the
required field-supplied fitting and the power wiringto blower
motor contactor 10M in unit control box.
If the unit includes an electric heat accessory, route the
power wires into heater control box in lieu of the unit. Refer
to electric heat instruction 550.13-N10.1U for additional
installation information.
CONTROL WIRING
Route the low voltage control wiring through the 7/8" hole
(with bushing) in the units rear panel. Add a 1/2" conduit
fitting to the 7/8" hole in the unit control box, route control
wiring through this opening and connect them to the
terminals on block 4TB.
Blower unit Model KBU060 contains a lowvoltage control
transformer (1T), which supplies the 24-volt control voltage
for its operation andfor the operation of the condensing unit.
CAUTION: To prevent possible interconnection between 24-
volt circuits, the condensing unit being used with
Model KEU060 blower unit must NOT contain its
own 24-volt power supply.
FIG. 14 - TYPICAL FIELD WIRING
Refer to Figures 12 and 13 for location of power and control
wiring openings in rear panel of the unit.
Refer to Figure 14 for typical field wiring. Refer toTable 7 to
size the disconnect switch, the power wiring and the fuses.
NOTE: Three phase motor rotations may be incorrect when
unit is first started. Reverse phase (leads L1 and L2)
at blower motor contactor to obtain correct rotation.
G
Y
RR
B
Y
O
W
X
53
G
60
66
GROUND
SCREW
TERMINALS ON SUPPLY AIR
BLOWER MOTOR CONTACTOR
10M
1-PHASE LINE VOLTAGE
POWER SUPPLY
24-VOLT
CONTROL
WIRING
24-VOLT
CONTROL
WIRING
TERMINALS ON
1ST STAGE
COOLING
THERMOSTAT
2TH12700424
WITH SUB-BASE
2TB08700124
NOTE: USE COPPER
CONDUCTORS
ONLY
POWER WIRING DISCONNECT
SWITCH AND FUSING TO BE
SUPPLIED BY FIELD
TERMINALS ON
COMPRESSOR
CONTACTOR M
OF THE CONDENSING
UNIT
1-PHASE
KBU060
B
O
W
X
53
G
60
66
R
Y
G
Y
R
C
T
V
TERMINALS ON
1ST STAGE
COOLING
THERMOSTAT
2TH12700424
WITH SUB-BASE
2TB08700124
24-VOLT
CONTROL
WIRING
GROUND
SCREW
TERMINALS ON SUPPLY AIR
BLOWER MOTOR CONTACTOR
10M
3-PHASE LINE VOLTAGE
POWER SUPPLY
24-VOLT
CONTROL
WIRING
TERMINALS ON
COMPRESSOR
CONTACTOR 3TB
OF THE CONDENSING
UNIT
3-PHASE
KBC090, 120
The field wiring connected to dummy
terminals R and Y on 4TB can be
routed directly from the condensing
unit to the thermostat if desired.
WIRE IN ACCORDANCE WITH LOCAL
AND NATIONAL ELECTRICAL CODES
POWER WIRING DISCONNECT
SWITCH AND FUSING TO BE
SUPPLIED BY FIELD
550.23-N2Z
12 Unitary Products Group

Model Basic
Unit1Nominal Heater KW2Power Supply Voltage3Full Load Amps Total Ampacity,
Amps Max. Fuse Size4, Amps Min.Wire
Size5, AWG Max.Wire Length6, Ft.
Heater Blower Motor
060
10 208 20.9 5.5 36 40 8 130
230 24.0 5.5 39 40 8 134
16 208 33.4 5.5 51 60 6 144
230 38.5 5.5 57 60 4 228
26 208 54.3 5.5 77 80 3 191
230 62.6 5.5 87 90 2 240
090
10 208 20.9 5.7 36 40 8 130 230 24.0 5.2 39 40 8 134
460 12.0 2.6 20 20 12 208
16 208 33.4 5.7 51 60 6 144 230 38.5 5.2 57 60 4 228
460 19.3 2.6 29 30 10 229
26 208 54.3 5.7 77 80 3 191 230 62.6 5.2 87 90 2 240
460 31.3 2.6 44 45 6 373
36 208 75.1 5.7 104 110 2 180 230 86.7 5.2 117 125 1 223
460 43.4 2.6 59 60 4 440
120
10 208 20.9 7.5 40 40 8 117 230 24.0 6.8 42 45 6 196
460 12.0 3.4 21 25 10 316
16 208 33.4 7.5 55 60 6 134 230 38.5 6.8 60 60 4 217
460 19.3 3.4 30 30 10 221
26 208 54.3 7.5 81 90 2 231 230 62.6 6.8 90 90 2 232
460 31.3 3.4 45 45 6 365
36 208 75.1 10.6 107 110 2 174 230 86.7 9.6 120 125 1 217
460 43.4 4.8 660 30 4 433
1Units with an electric heat accessory will always be wired for a single power supply.
2Refer to the HEATING CAPACITY table for the actual KW and MBH ratings of each heater at thedifferent voltages.
3All voltages are for 3-phase, 60 hertz operation.
4Inverse time circuit breakers may be used in lieu of dual element, time delay fuses.
5Based on three, insulated copper conductors in steel conduit
60°C wire when the total unit ampacity is below 100 amps.
75°C.wires when the total unit ampacity is above 100 amps.
6Based on a 3% voltagedrop.
TABLE 8 - ELECTRICAL DATA- Units with Electric Heat
Model Motor Blower HP Power Supply Full Load Amps Maximum Fuse Size1, Amps Maximum Wire Length2, Feet
060 3/4 208/230-1-60 5.5 10 191
090 1-1/2 208-3-60 5.7 10 191 230-3-60 5.2 10 233
460-3-60 2.6 5 933
120 2 208-3-60 7.5 10 145 230-3-60 6.8 10 178
460-3-60 3.4 5 714
1Dual element, time delay fuses. 2Based on three, 60°C, 14 AWG, insulated copper conductors in steel conduit and a 3% voltage drop.
TABLE 7 - ELECTRICAL DATA- Cooling Only Unit
MAINTENANCE
FILTERS
The filters must be cleaned or replaced as often as
necessary to assure good airflow and filtering action.
Refer to the unit dimension detail (Figure 12 or 13) for the
location of the filter access panel.
EVAPORATOR COIL
Do not allow dirt to accumulate on the evaporator coil or
other parts of theevaporator air circuit. Clean as often as
necessary to assure good system performance. Use a
brush, vacuum cleaner attachment or other suitable means.
DRAINPAN
The drain pan should be inspected regularly to assure proper
drainage.
LUBRICATION
The bearings for the blower shaft and the blower motor are
permanently lubricated and should not require and additional
lubrication.
BELTS
Maintain belt tension to extend belt life. Replace when signs
of failure begin to appear.
550.23-N2Z
Unitary Products Group 13

550.23-N2Z
14 Unitary Products Group

550.23-N2Z
Unitary Products Group 15

Supersedes 550.23-N2W(589)
Subject to change without notice. Printed in U.S.A.
Copyright © by Unitary Products Group 1999. All rights reserved.
Unitary
Products
Group
5005
York
Drive
Norman
Oklahoma
73069
Code: SBL, F, C, A 550.23-N2Z (399)